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source: trunk/kernel/kern/process.c @ 472

Last change on this file since 472 was 472, checked in by alain, 7 years ago

Fix the bug found by Axel in the process_register_thread() function

This function must use a busy-waiting lock when the thread is the IDLE_THREAD,
because we cennot use a descheduling policy when the IDLE_THREAD desriptor
is not initialised.

File size: 73.3 KB

Line
1	/*
2	* process.c - process related management
3	*
4	* Authors Ghassan Almaless (2008,2009,2010,2011,2012)
5	* Mohamed Lamine Karaoui (2015)
6	* Alain Greiner (2016,2017,2018)
7	*
8	* Copyright (c) UPMC Sorbonne Universites
9	*
10	* This file is part of ALMOS-MKH.
11	*
12	* ALMOS-MKH is free software; you can redistribute it and/or modify it
13	* under the terms of the GNU General Public License as published by
14	* the Free Software Foundation; version 2.0 of the License.
15	*
16	* ALMOS-MKH is distributed in the hope that it will be useful, but
17	* WITHOUT ANY WARRANTY; without even the implied warranty of
18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19	* General Public License for more details.
20	*
21	* You should have received a copy of the GNU General Public License
22	* along with ALMOS-MKH; if not, write to the Free Software Foundation,
23	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24	*/
25
26	#include <kernel_config.h>
27	#include <hal_kernel_types.h>
28	#include <hal_remote.h>
29	#include <hal_uspace.h>
30	#include <hal_irqmask.h>
31	#include <errno.h>
32	#include <printk.h>
33	#include <memcpy.h>
34	#include <bits.h>
35	#include <kmem.h>
36	#include <page.h>
37	#include <vmm.h>
38	#include <vfs.h>
39	#include <core.h>
40	#include <thread.h>
41	#include <chdev.h>
42	#include <list.h>
43	#include <string.h>
44	#include <scheduler.h>
45	#include <remote_spinlock.h>
46	#include <dqdt.h>
47	#include <cluster.h>
48	#include <ppm.h>
49	#include <boot_info.h>
50	#include <process.h>
51	#include <elf.h>
52	#include <syscalls.h>
53	#include <shared_syscalls.h>
54
55	//////////////////////////////////////////////////////////////////////////////////////////
56	// Extern global variables
57	//////////////////////////////////////////////////////////////////////////////////////////
58
59	extern process_t process_zero; // allocated in kernel_init.c
60	extern chdev_directory_t chdev_dir; // allocated in kernel_init.c
61
62	//////////////////////////////////////////////////////////////////////////////////////////
63	// Process initialisation related functions
64	//////////////////////////////////////////////////////////////////////////////////////////
65
66	///////////////////////////
67	process_t * process_alloc()
68	{
69	kmem_req_t req;
70
71	req.type = KMEM_PROCESS;
72	req.size = sizeof(process_t);
73	req.flags = AF_KERNEL;
74
75	return (process_t *)kmem_alloc( &req );
76	}
77
78	////////////////////////////////////////
79	void process_free( process_t * process )
80	{
81	kmem_req_t req;
82
83	req.type = KMEM_PROCESS;
84	req.ptr = process;
85	kmem_free( &req );
86	}
87
88	/////////////////////////////////////////////////
89	void process_reference_init( process_t * process,
90	pid_t pid,
91	xptr_t parent_xp )
92	{
93	cxy_t parent_cxy;
94	process_t * parent_ptr;
95	xptr_t stdin_xp;
96	xptr_t stdout_xp;
97	xptr_t stderr_xp;
98	uint32_t stdin_id;
99	uint32_t stdout_id;
100	uint32_t stderr_id;
101	error_t error;
102	uint32_t txt_id;
103	char rx_path[40];
104	char tx_path[40];
105	xptr_t file_xp;
106	xptr_t chdev_xp;
107	chdev_t * chdev_ptr;
108	cxy_t chdev_cxy;
109	pid_t parent_pid;
110
111	// get parent process cluster and local pointer
112	parent_cxy = GET_CXY( parent_xp );
113	parent_ptr = GET_PTR( parent_xp );
114
115	// get parent_pid
116	parent_pid = hal_remote_lw( XPTR( parent_cxy , &parent_ptr->pid ) );
117
118	#if DEBUG_PROCESS_REFERENCE_INIT
119	uint32_t cycle = (uint32_t)hal_get_cycles();
120	if( DEBUG_PROCESS_REFERENCE_INIT )
121	printk("\n[DBG] %s : thread %x in process %x enter to initalialize process %x / cycle %d\n",
122	__FUNCTION__, CURRENT_THREAD->trdid, parent_pid , pid , cycle );
123	#endif
124
125	// initialize PID, REF_XP, PARENT_XP, and STATE
126	process->pid = pid;
127	process->ref_xp = XPTR( local_cxy , process );
128	process->owner_xp = XPTR( local_cxy , process );
129	process->parent_xp = parent_xp;
130	process->term_state = 0;
131
132	// initialize vmm as empty
133	error = vmm_init( process );
134	assert( (error == 0) , __FUNCTION__ , "cannot initialize VMM\n" );
135
136	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
137	cycle = (uint32_t)hal_get_cycles();
138	if( DEBUG_PROCESS_REFERENCE_INIT )
139	printk("\n[DBG] %s : thread %x in process %x / vmm empty for process %x / cycle %d\n",
140	__FUNCTION__, CURRENT_THREAD->trdid, parent_pid , cycle );
141	#endif
142
143	// initialize fd_array as empty
144	process_fd_init( process );
145
146	// define the stdin/stdout/stderr pseudo files <=> select a TXT terminal.
147	if( (pid == 1) \|\| (parent_pid == 1)) // INIT or KSH process
148	{
149	// allocate a TXT channel
150	if( pid == 1 ) txt_id = 0; // INIT
151	else txt_id = process_txt_alloc(); // KSH
152
153	// attach process to TXT
154	process_txt_attach( process , txt_id );
155
156	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
157	cycle = (uint32_t)hal_get_cycles();
158	if( DEBUG_PROCESS_REFERENCE_INIT )
159	printk("\n[DBG] %s : thread %x in process %x / process %x attached to TXT%d / cycle %d\n",
160	__FUNCTION__, CURRENT_THREAD->trdid, parent_pid, pid, txt_id, cycle );
161	#endif
162
163
164
165	// build path to TXT_RX[i] and TXT_TX[i] chdevs
166	snprintf( rx_path , 40 , "/dev/external/txt%d_rx", txt_id );
167	snprintf( tx_path , 40 , "/dev/external/txt%d_tx", txt_id );
168
169	// create stdin pseudo file
170	error = vfs_open( process,
171	rx_path,
172	O_RDONLY,
173	0, // FIXME chmod
174	&stdin_xp,
175	&stdin_id );
176
177	assert( (error == 0) , __FUNCTION__ , "cannot open stdin pseudo file" );
178	assert( (stdin_id == 0) , __FUNCTION__ , "stdin index must be 0" );
179
180	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
181	cycle = (uint32_t)hal_get_cycles();
182	if( DEBUG_PROCESS_REFERENCE_INIT )
183	printk("\n[DBG] %s : thread %x in process %x / stdin open for process %x / cycle %d\n",
184	__FUNCTION__, CURRENT_THREAD->trdid, parent_pid, pid, cycle );
185	#endif
186
187	// create stdout pseudo file
188	error = vfs_open( process,
189	tx_path,
190	O_WRONLY,
191	0, // FIXME chmod
192	&stdout_xp,
193	&stdout_id );
194
195	assert( (error == 0) , __FUNCTION__ , "cannot open stdout pseudo file" );
196	assert( (stdout_id == 1) , __FUNCTION__ , "stdout index must be 1" );
197
198	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
199	cycle = (uint32_t)hal_get_cycles();
200	if( DEBUG_PROCESS_REFERENCE_INIT )
201	printk("\n[DBG] %s : thread %x in process %x / stdout open for process %x / cycle %d\n",
202	__FUNCTION__, CURRENT_THREAD->trdid, parent_pid, pid, cycle );
203	#endif
204
205	// create stderr pseudo file
206	error = vfs_open( process,
207	tx_path,
208	O_WRONLY,
209	0, // FIXME chmod
210	&stderr_xp,
211	&stderr_id );
212
213	assert( (error == 0) , __FUNCTION__ , "cannot open stderr pseudo file" );
214	assert( (stderr_id == 2) , __FUNCTION__ , "stderr index must be 2" );
215
216	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
217	cycle = (uint32_t)hal_get_cycles();
218	if( DEBUG_PROCESS_REFERENCE_INIT )
219	printk("\n[DBG] %s : thread %x in process %x / stderr open for process %x / cycle %d\n",
220	__FUNCTION__, CURRENT_THREAD->trdid, parent_pid, pid, cycle );
221	#endif
222
223	}
224	else // normal user process
225	{
226	// get extended pointer on stdin pseudo file in parent process
227	file_xp = (xptr_t)hal_remote_lwd( XPTR( parent_cxy , &parent_ptr->fd_array.array[0] ) );
228
229	// get extended pointer on parent process TXT chdev
230	chdev_xp = chdev_from_file( file_xp );
231
232	// get cluster and local pointer on chdev
233	chdev_cxy = GET_CXY( chdev_xp );
234	chdev_ptr = GET_PTR( chdev_xp );
235
236	// get TXT terminal index
237	txt_id = hal_remote_lw( XPTR( chdev_cxy , &chdev_ptr->channel ) );
238
239	// attach process to TXT[txt_id]
240	process_txt_attach( process , txt_id );
241
242	// copy all open files from parent process fd_array to this process
243	process_fd_remote_copy( XPTR( local_cxy , &process->fd_array ),
244	XPTR( parent_cxy , &parent_ptr->fd_array ) );
245	}
246
247	// initialize specific inodes root and cwd
248	process->vfs_root_xp = (xptr_t)hal_remote_lwd( XPTR( parent_cxy,
249	&parent_ptr->vfs_root_xp ) );
250	process->vfs_cwd_xp = (xptr_t)hal_remote_lwd( XPTR( parent_cxy,
251	&parent_ptr->vfs_cwd_xp ) );
252	vfs_inode_remote_up( process->vfs_root_xp );
253	vfs_inode_remote_up( process->vfs_cwd_xp );
254
255	remote_rwlock_init( XPTR( local_cxy , &process->cwd_lock ) );
256
257	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
258	cycle = (uint32_t)hal_get_cycles();
259	if( DEBUG_PROCESS_REFERENCE_INIT )
260	printk("\n[DBG] %s : thread %x / fd_array for process %x / cycle %d\n",
261	__FUNCTION__ , CURRENT_THREAD , pid , cycle );
262	#endif
263
264	// reset children list root
265	xlist_root_init( XPTR( local_cxy , &process->children_root ) );
266	process->children_nr = 0;
267	remote_spinlock_init( XPTR( local_cxy , &process->children_lock ) );
268
269	// reset semaphore / mutex / barrier / condvar list roots
270	xlist_root_init( XPTR( local_cxy , &process->sem_root ) );
271	xlist_root_init( XPTR( local_cxy , &process->mutex_root ) );
272	xlist_root_init( XPTR( local_cxy , &process->barrier_root ) );
273	xlist_root_init( XPTR( local_cxy , &process->condvar_root ) );
274	remote_spinlock_init( XPTR( local_cxy , &process->sync_lock ) );
275
276	// register new process in the local cluster manager pref_tbl[]
277	lpid_t lpid = LPID_FROM_PID( pid );
278	LOCAL_CLUSTER->pmgr.pref_tbl[lpid] = XPTR( local_cxy , process );
279
280	// register new process descriptor in local cluster manager local_list
281	cluster_process_local_link( process );
282
283	// register new process descriptor in local cluster manager copies_list
284	cluster_process_copies_link( process );
285
286	// reset th_tbl[] array as empty in process descriptor
287	uint32_t i;
288	for( i = 0 ; i < CONFIG_THREAD_MAX_PER_CLUSTER ; i++ )
289	{
290	process->th_tbl[i] = NULL;
291	}
292	process->th_nr = 0;
293	spinlock_init( &process->th_lock );
294
295	hal_fence();
296
297	#if (DEBUG_PROCESS_REFERENCE_INIT & 1)
298	cycle = (uint32_t)hal_get_cycles();
299	if( DEBUG_PROCESS_REFERENCE_INIT )
300	printk("\n[DBG] %s : thread %x exit / process %x / cycle %d\n",
301	__FUNCTION__ , CURRENT_THREAD , pid , cycle );
302	#endif
303
304	} // process_reference_init()
305
306	/////////////////////////////////////////////////////
307	error_t process_copy_init( process_t * local_process,
308	xptr_t reference_process_xp )
309	{
310	error_t error;
311
312	// get reference process cluster and local pointer
313	cxy_t ref_cxy = GET_CXY( reference_process_xp );
314	process_t * ref_ptr = GET_PTR( reference_process_xp );
315
316	// initialize PID, REF_XP, PARENT_XP, and STATE
317	local_process->pid = hal_remote_lw( XPTR( ref_cxy , &ref_ptr->pid ) );
318	local_process->parent_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->parent_xp ) );
319	local_process->ref_xp = reference_process_xp;
320	local_process->owner_xp = reference_process_xp;
321	local_process->term_state = 0;
322
323	#if DEBUG_PROCESS_COPY_INIT
324	uint32_t cycle = (uint32_t)hal_get_cycles();
325	if( DEBUG_PROCESS_COPY_INIT )
326	printk("\n[DBG] %s : thread %x enter for process %x\n",
327	__FUNCTION__ , CURRENT_THREAD , local_process->pid );
328	#endif
329
330	// reset local process vmm
331	error = vmm_init( local_process );
332	assert( (error == 0) , __FUNCTION__ , "cannot initialize VMM\n");
333
334	// reset process file descriptors array
335	process_fd_init( local_process );
336
337	// reset vfs_root_xp / vfs_bin_xp / vfs_cwd_xp fields
338	local_process->vfs_root_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_root_xp ) );
339	local_process->vfs_bin_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_bin_xp ) );
340	local_process->vfs_cwd_xp = XPTR_NULL;
341
342	// reset children list root (not used in a process descriptor copy)
343	xlist_root_init( XPTR( local_cxy , &local_process->children_root ) );
344	local_process->children_nr = 0;
345	remote_spinlock_init( XPTR( local_cxy , &local_process->children_lock ) );
346
347	// reset children_list (not used in a process descriptor copy)
348	xlist_entry_init( XPTR( local_cxy , &local_process->children_list ) );
349
350	// reset semaphores list root (not used in a process descriptor copy)
351	xlist_root_init( XPTR( local_cxy , &local_process->sem_root ) );
352	xlist_root_init( XPTR( local_cxy , &local_process->mutex_root ) );
353	xlist_root_init( XPTR( local_cxy , &local_process->barrier_root ) );
354	xlist_root_init( XPTR( local_cxy , &local_process->condvar_root ) );
355
356	// reset th_tbl[] array as empty
357	uint32_t i;
358	for( i = 0 ; i < CONFIG_THREAD_MAX_PER_CLUSTER ; i++ )
359	{
360	local_process->th_tbl[i] = NULL;
361	}
362	local_process->th_nr = 0;
363	spinlock_init( &local_process->th_lock );
364
365	// register new process descriptor in local cluster manager local_list
366	cluster_process_local_link( local_process );
367
368	// register new process descriptor in owner cluster manager copies_list
369	cluster_process_copies_link( local_process );
370
371	hal_fence();
372
373	#if DEBUG_PROCESS_COPY_INIT
374	cycle = (uint32_t)hal_get_cycles();
375	if( DEBUG_PROCESS_COPY_INIT )
376	printk("\n[DBG] %s : thread %x exit for process %x\n",
377	__FUNCTION__ , CURRENT_THREAD , local_process->pid );
378	#endif
379
380	return 0;
381
382	} // end process_copy_init()
383
384	///////////////////////////////////////////
385	void process_destroy( process_t * process )
386	{
387	xptr_t parent_xp;
388	process_t * parent_ptr;
389	cxy_t parent_cxy;
390	xptr_t children_lock_xp;
391	xptr_t children_nr_xp;
392
393	pid_t pid = process->pid;
394
395	assert( (process->th_nr == 0) , __FUNCTION__ ,
396	"process %x in cluster %x has still active threads", pid , local_cxy );
397
398	#if DEBUG_PROCESS_DESTROY
399	uint32_t cycle = (uint32_t)hal_get_cycles();
400	if( DEBUG_PROCESS_DESTROY )
401	printk("\n[DBG] %s : thread %x enter for process %x in cluster %x / cycle %d\n",
402	__FUNCTION__ , CURRENT_THREAD , pid , local_cxy , cycle );
403	#endif
404
405	// remove process from local_list in local cluster manager
406	cluster_process_local_unlink( process );
407
408	// remove process from copies_list in owner cluster manager
409	cluster_process_copies_unlink( process );
410
411	// remove process from children_list
412	// and release PID if owner cluster
413	if( CXY_FROM_PID( pid ) == local_cxy )
414	{
415	// get pointers on parent process
416	parent_xp = process->parent_xp;
417	parent_cxy = GET_CXY( parent_xp );
418	parent_ptr = GET_PTR( parent_xp );
419
420	// get extended pointer on children_lock in parent process
421	children_lock_xp = XPTR( parent_cxy , &parent_ptr->children_lock );
422	children_nr_xp = XPTR( parent_cxy , &parent_ptr->children_nr );
423
424	// remove process from children_list
425	remote_spinlock_lock( children_lock_xp );
426	xlist_unlink( XPTR( local_cxy , &process->children_list ) );
427	hal_remote_atomic_add( children_nr_xp , -1 );
428	remote_spinlock_unlock( children_lock_xp );
429
430	// release the process PID to cluster manager
431	cluster_pid_release( pid );
432
433	}
434
435	// FIXME close all open files and update dirty [AG]
436
437	// decrease refcount for bin file, root file and cwd file
438	if( process->vfs_bin_xp != XPTR_NULL ) vfs_file_count_down( process->vfs_bin_xp );
439	if( process->vfs_root_xp != XPTR_NULL ) vfs_file_count_down( process->vfs_root_xp );
440	if( process->vfs_cwd_xp != XPTR_NULL ) vfs_file_count_down( process->vfs_cwd_xp );
441
442	// Destroy VMM
443	vmm_destroy( process );
444
445	// release memory allocated to process descriptor
446	process_free( process );
447
448	#if DEBUG_PROCESS_DESTROY
449	cycle = (uint32_t)hal_get_cycles();
450	if( DEBUG_PROCESS_DESTROY )
451	printk("\n[DBG] %s : thread %x exit / destroyed process %x in cluster %x / cycle %d\n",
452	__FUNCTION__ , CURRENT_THREAD , pid, local_cxy, cycle );
453	#endif
454
455	} // end process_destroy()
456
457	/////////////////////////////////////////////////
458	char * process_action_str( uint32_t action_type )
459	{
460	if ( action_type == BLOCK_ALL_THREADS ) return "BLOCK";
461	else if( action_type == UNBLOCK_ALL_THREADS ) return "UNBLOCK";
462	else if( action_type == DELETE_ALL_THREADS ) return "DELETE";
463	else return "undefined";
464	}
465
466	////////////////////////////////////////
467	void process_sigaction( pid_t pid,
468	uint32_t type )
469	{
470	cxy_t owner_cxy; // owner cluster identifier
471	lpid_t lpid; // process index in owner cluster
472	cluster_t * cluster; // pointer on cluster manager
473	xptr_t root_xp; // extended pointer on root of copies
474	xptr_t lock_xp; // extended pointer on lock protecting copies
475	xptr_t iter_xp; // iterator on copies list
476	xptr_t process_xp; // extended pointer on process copy
477	cxy_t process_cxy; // process copy cluster identifier
478	process_t * process_ptr; // local pointer on process copy
479	reg_t save_sr; // for critical section
480	rpc_desc_t rpc; // shared RPC descriptor
481	thread_t * client; // pointer on client thread
482	xptr_t client_xp; // extended pointer on client thread
483	process_t * local; // pointer on process copy in local cluster
484	uint32_t remote_nr; // number of remote process copies
485
486	client = CURRENT_THREAD;
487	client_xp = XPTR( local_cxy , client );
488	local = NULL;
489	remote_nr = 0;
490
491	#if DEBUG_PROCESS_SIGACTION
492	uint32_t cycle = (uint32_t)hal_get_cycles();
493	if( DEBUG_PROCESS_SIGACTION < cycle )
494	printk("\n[DBG] %s : thread %x in process %x enter to %s process %x / cycle %d\n",
495	__FUNCTION__ , client->trdid, client->process->pid,
496	process_action_str( type ) , pid , cycle );
497	#endif
498
499	// get pointer on local cluster manager
500	cluster = LOCAL_CLUSTER;
501
502	// get owner cluster identifier and process lpid
503	owner_cxy = CXY_FROM_PID( pid );
504	lpid = LPID_FROM_PID( pid );
505
506	// get root of list of copies, lock, and number of copies from owner cluster
507	root_xp = XPTR( owner_cxy , &cluster->pmgr.copies_root[lpid] );
508	lock_xp = XPTR( owner_cxy , &cluster->pmgr.copies_lock[lpid] );
509
510	// check action type
511	assert( ((type == DELETE_ALL_THREADS ) \|\|
512	(type == BLOCK_ALL_THREADS ) \|\|
513	(type == UNBLOCK_ALL_THREADS )), __FUNCTION__ , "illegal action type" );
514
515
516	// The client thread send parallel RPCs to all remote clusters containing
517	// target process copies, wait all responses, and then handles directly the
518	// threads in local cluster, when required.
519	// The client thread allocates a - shared - RPC descriptor in the stack,
520	// because all parallel, non-blocking, server threads use the same input
521	// arguments, and use the shared RPC response field
522
523	// mask IRQs
524	hal_disable_irq( &save_sr);
525
526	// client thread blocks itself
527	thread_block( client_xp , THREAD_BLOCKED_RPC );
528
529	// take the lock protecting the copies
530	remote_spinlock_lock( lock_xp );
531
532	// initialize shared RPC descriptor
533	rpc.responses = 0;
534	rpc.blocking = false;
535	rpc.index = RPC_PROCESS_SIGACTION;
536	rpc.thread = client;
537	rpc.lid = client->core->lid;
538	rpc.args[0] = type;
539	rpc.args[1] = pid;
540
541	// scan list of process copies
542	// to send RPCs to remote copies
543	XLIST_FOREACH( root_xp , iter_xp )
544	{
545	// get extended pointers and cluster on process
546	process_xp = XLIST_ELEMENT( iter_xp , process_t , copies_list );
547	process_cxy = GET_CXY( process_xp );
548	process_ptr = GET_PTR( process_xp );
549
550	if( process_cxy == local_cxy ) // process is local
551	{
552	local = process_ptr;
553	}
554	else // process is remote
555	{
556	// update number of remote process copies
557	remote_nr++;
558
559	// atomically increment responses counter
560	hal_atomic_add( (void *)&rpc.responses , 1 );
561
562	#if DEBUG_PROCESS_SIGACTION
563	if( DEBUG_PROCESS_SIGACTION < cycle )
564	printk("\n[DBG] %s : thread %x in process %x handles remote process %x in cluster %x\n",
565	__FUNCTION__, client->trdid, client->process->pid, pid , process_cxy );
566	#endif
567	// call RPC in target cluster
568	rpc_process_sigaction_client( process_cxy , &rpc );
569	}
570	} // end list of copies
571
572	// release the lock protecting process copies
573	remote_spinlock_unlock( lock_xp );
574
575	// restore IRQs
576	hal_restore_irq( save_sr);
577
578	// - if there is remote process copies, the client thread deschedules,
579	// (it will be unblocked by the last RPC server thread).
580	// - if there is no remote copies, the client thread unblock itself.
581	if( remote_nr )
582	{
583	sched_yield("blocked on rpc_process_sigaction");
584	}
585	else
586	{
587	thread_unblock( client_xp , THREAD_BLOCKED_RPC );
588	}
589
590	// handle the local process copy if required
591	if( local != NULL )
592	{
593
594	#if DEBUG_PROCESS_SIGACTION
595	if( DEBUG_PROCESS_SIGACTION < cycle )
596	printk("\n[DBG] %s : thread %x in process %x handles local process %x in cluster %x\n",
597	__FUNCTION__, client->trdid, client->process->pid, pid , local_cxy );
598	#endif
599	if (type == DELETE_ALL_THREADS ) process_delete_threads ( local , client_xp );
600	else if(type == BLOCK_ALL_THREADS ) process_block_threads ( local , client_xp );
601	else if(type == UNBLOCK_ALL_THREADS ) process_unblock_threads( local );
602	}
603
604	#if DEBUG_PROCESS_SIGACTION
605	cycle = (uint32_t)hal_get_cycles();
606	if( DEBUG_PROCESS_SIGACTION < cycle )
607	printk("\n[DBG] %s : thread %x in process %x exit after %s process %x / cycle %d\n",
608	__FUNCTION__, client->trdid, client->process->pid,
609	process_action_str( type ), pid, cycle );
610	#endif
611
612	} // end process_sigaction()
613
614	/////////////////////////////////////////////////
615	void process_block_threads( process_t * process,
616	xptr_t client_xp )
617	{
618	thread_t * target; // pointer on target thread
619	thread_t * this; // pointer on calling thread
620	uint32_t ltid; // index in process th_tbl
621	cxy_t owner_cxy; // target process owner cluster
622	uint32_t count; // requests counter
623	volatile uint32_t ack_count; // scheduler acknowledge counter
624
625	// get calling thread pointer
626	this = CURRENT_THREAD;
627
628	// get target process owner cluster
629	owner_cxy = CXY_FROM_PID( process->pid );
630
631	#if DEBUG_PROCESS_SIGACTION
632	uint32_t cycle = (uint32_t)hal_get_cycles();
633	if( DEBUG_PROCESS_SIGACTION < cycle )
634	printk("\n[DBG] %s : thread %x enter for process %x in cluster %x / cycle %d\n",
635	__FUNCTION__ , this , process->pid , local_cxy , cycle );
636	#endif
637
638	// get lock protecting process th_tbl[]
639	spinlock_lock( &process->th_lock );
640
641	// loop on target process local threads
642	// we use both "ltid" and "count" because it can exist "holes" in th_tbl
643	for( ltid = 0 , count = 0 , ack_count = 0 ; count < process->th_nr ; ltid++ )
644	{
645	target = process->th_tbl[ltid];
646
647	if( target != NULL ) // thread exist
648	{
649	count++;
650
651	// main thread and client thread should not be blocked
652	if( ((ltid != 0) \|\| (owner_cxy != local_cxy)) && // not main thread
653	(client_xp) != XPTR( local_cxy , target ) ) // not client thread
654	{
655	// set the global blocked bit in target thread descriptor.
656	thread_block( XPTR( local_cxy , target ) , THREAD_BLOCKED_GLOBAL );
657
658	// - if the calling thread and the target thread are on the same core,
659	// we don't need confirmation from scheduler,
660	// - if the calling thread and the target thread are not running on the same
661	// core, we ask the target scheduler to acknowlege the blocking
662	// to be sure that the target thread is not running.
663
664	if( this->core->lid != target->core->lid )
665	{
666	// increment responses counter
667	hal_atomic_add( (void*)&ack_count , 1 );
668
669	// set FLAG_REQ_ACK and &ack_rsp_count in target descriptor
670	thread_set_req_ack( target , (uint32_t *)&ack_count );
671
672	// force scheduling on target thread
673	dev_pic_send_ipi( local_cxy , target->core->lid );
674	}
675	}
676	}
677	}
678
679	// release lock protecting process th_tbl[]
680	spinlock_unlock( &process->th_lock );
681
682	// wait acknowledges
683	while( 1 )
684	{
685	// exit when all scheduler acknoledges received
686	if ( ack_count == 0 ) break;
687
688	// wait 1000 cycles before retry
689	hal_fixed_delay( 1000 );
690	}
691
692	#if DEBUG_PROCESS_SIGACTION
693	cycle = (uint32_t)hal_get_cycles();
694	if( DEBUG_PROCESS_SIGACTION < cycle )
695	printk("\n[DBG] %s : thread %x exit for process %x in cluster %x / cycle %d\n",
696	__FUNCTION__ , this , process->pid , local_cxy , cycle );
697	#endif
698
699	} // end process_block_threads()
700
701	/////////////////////////////////////////////////
702	void process_delete_threads( process_t * process,
703	xptr_t client_xp )
704	{
705	thread_t * this; // pointer on calling thread
706	thread_t * target; // local pointer on target thread
707	xptr_t target_xp; // extended pointer on target thread
708	cxy_t owner_cxy; // owner process cluster
709	uint32_t ltid; // index in process th_tbl
710	uint32_t count; // threads counter
711
712	// get calling thread pointer
713	this = CURRENT_THREAD;
714
715	// get target process owner cluster
716	owner_cxy = CXY_FROM_PID( process->pid );
717
718	#if DEBUG_PROCESS_SIGACTION
719	uint32_t cycle = (uint32_t)hal_get_cycles();
720	if( DEBUG_PROCESS_SIGACTION < cycle )
721	printk("\n[DBG] %s : thread %x enter for process %x in cluster %x / cycle %d\n",
722	__FUNCTION__ , this , process->pid , local_cxy , cycle );
723	#endif
724
725	// get lock protecting process th_tbl[]
726	spinlock_lock( &process->th_lock );
727
728	// loop on target process local threads
729	// we use both "ltid" and "count" because it can exist "holes" in th_tbl
730	for( ltid = 0 , count = 0 ; count < process->th_nr ; ltid++ )
731	{
732	target = process->th_tbl[ltid];
733
734	if( target != NULL ) // valid thread
735	{
736	count++;
737	target_xp = XPTR( local_cxy , target );
738
739	// main thread and client thread should not be blocked
740	if( ((ltid != 0) \|\| (owner_cxy != local_cxy)) && // not main thread
741	(client_xp) != target_xp ) // not client thread
742	{
743	// mark target thread for delete and block it
744	thread_delete( target_xp , process->pid , false ); // not forced
745	}
746	}
747	}
748
749	// release lock protecting process th_tbl[]
750	spinlock_unlock( &process->th_lock );
751
752	#if DEBUG_PROCESS_SIGACTION
753	cycle = (uint32_t)hal_get_cycles();
754	if( DEBUG_PROCESS_SIGACTION < cycle )
755	printk("\n[DBG] %s : thread %x exit for process %x in cluster %x / cycle %d\n",
756	__FUNCTION__ , this , process->pid , local_cxy , cycle );
757	#endif
758
759	} // end process_delete_threads()
760
761	///////////////////////////////////////////////////
762	void process_unblock_threads( process_t * process )
763	{
764	thread_t * target; // pointer on target thead
765	thread_t * this; // pointer on calling thread
766	uint32_t ltid; // index in process th_tbl
767	uint32_t count; // requests counter
768
769	// get calling thread pointer
770	this = CURRENT_THREAD;
771
772	#if DEBUG_PROCESS_SIGACTION
773	uint32_t cycle = (uint32_t)hal_get_cycles();
774	if( DEBUG_PROCESS_SIGACTION < cycle )
775	printk("\n[DBG] %s : thread %x enter for process %x in cluster %x / cycle %d\n",
776	__FUNCTION__ , this , process->pid , local_cxy , cycle );
777	#endif
778
779	// get lock protecting process th_tbl[]
780	spinlock_lock( &process->th_lock );
781
782	// loop on process threads to unblock all threads
783	// we use both "ltid" and "count" because it can exist "holes" in th_tbl
784	for( ltid = 0 , count = 0 ; count < process->th_nr ; ltid++ )
785	{
786	target = process->th_tbl[ltid];
787
788	if( target != NULL ) // thread found
789	{
790	count++;
791
792	// reset the global blocked bit in target thread descriptor.
793	thread_unblock( XPTR( local_cxy , target ) , THREAD_BLOCKED_GLOBAL );
794	}
795	}
796
797	// release lock protecting process th_tbl[]
798	spinlock_unlock( &process->th_lock );
799
800	#if DEBUG_PROCESS_SIGACTION
801	cycle = (uint32_t)hal_get_cycles();
802	if( DEBUG_PROCESS_SIGACTION < cycle )
803	printk("\n[DBG] %s : thread %x exit for process %x in cluster %x / cycle %d\n",
804	__FUNCTION__ , this , process->pid , local_cxy , cycle );
805	#endif
806
807	} // end process_unblock_threads()
808
809	///////////////////////////////////////////////
810	process_t * process_get_local_copy( pid_t pid )
811	{
812	error_t error;
813	process_t * process_ptr; // local pointer on process
814	xptr_t process_xp; // extended pointer on process
815
816	cluster_t * cluster = LOCAL_CLUSTER;
817
818	// get lock protecting local list of processes
819	remote_spinlock_lock( XPTR( local_cxy , &cluster->pmgr.local_lock ) );
820
821	// scan the local list of process descriptors to find the process
822	xptr_t iter;
823	bool_t found = false;
824	XLIST_FOREACH( XPTR( local_cxy , &cluster->pmgr.local_root ) , iter )
825	{
826	process_xp = XLIST_ELEMENT( iter , process_t , local_list );
827	process_ptr = GET_PTR( process_xp );
828	if( process_ptr->pid == pid )
829	{
830	found = true;
831	break;
832	}
833	}
834
835	// release lock protecting local list of processes
836	remote_spinlock_unlock( XPTR( local_cxy , &cluster->pmgr.local_lock ) );
837
838	// allocate memory for a new local process descriptor
839	// and initialise it from reference cluster if not found
840	if( !found )
841	{
842	// get extended pointer on reference process descriptor
843	xptr_t ref_xp = cluster_get_reference_process_from_pid( pid );
844
845	assert( (ref_xp != XPTR_NULL) , __FUNCTION__ , "illegal pid\n" );
846
847	// allocate memory for local process descriptor
848	process_ptr = process_alloc();
849
850	if( process_ptr == NULL ) return NULL;
851
852	// initialize local process descriptor copy
853	error = process_copy_init( process_ptr , ref_xp );
854
855	if( error ) return NULL;
856	}
857
858	#if DEBUG_PROCESS_GET_LOCAL_COPY
859	uint32_t cycle = (uint32_t)hal_get_cycles();
860	if( DEBUG_PROCESS_GET_LOCAL_COPY < cycle )
861	printk("\n[DBG] %s : enter in cluster %x / pid %x / process %x / cycle %d\n",
862	__FUNCTION__ , local_cxy , pid , process_ptr , cycle );
863	#endif
864
865	return process_ptr;
866
867	} // end process_get_local_copy()
868
869	////////////////////////////////////////////
870	pid_t process_get_ppid( xptr_t process_xp )
871	{
872	cxy_t process_cxy;
873	process_t * process_ptr;
874	xptr_t parent_xp;
875	cxy_t parent_cxy;
876	process_t * parent_ptr;
877
878	// get process cluster and local pointer
879	process_cxy = GET_CXY( process_xp );
880	process_ptr = GET_PTR( process_xp );
881
882	// get pointers on parent process
883	parent_xp = (xptr_t)hal_remote_lwd( XPTR( process_cxy , &process_ptr->parent_xp ) );
884	parent_cxy = GET_CXY( parent_xp );
885	parent_ptr = GET_PTR( parent_xp );
886
887	return hal_remote_lw( XPTR( parent_cxy , &parent_ptr->pid ) );
888	}
889
890	//////////////////////////////////////////////////////////////////////////////////////////
891	// File descriptor array related functions
892	//////////////////////////////////////////////////////////////////////////////////////////
893
894	///////////////////////////////////////////
895	void process_fd_init( process_t * process )
896	{
897	uint32_t fd;
898
899	remote_spinlock_init( XPTR( local_cxy , &process->fd_array.lock ) );
900
901	process->fd_array.current = 0;
902
903	// initialize array
904	for ( fd = 0 ; fd < CONFIG_PROCESS_FILE_MAX_NR ; fd++ )
905	{
906	process->fd_array.array[fd] = XPTR_NULL;
907	}
908	}
909
910	//////////////////////////////
911	bool_t process_fd_array_full()
912	{
913	// get extended pointer on reference process
914	xptr_t ref_xp = CURRENT_THREAD->process->ref_xp;
915
916	// get reference process cluster and local pointer
917	process_t * ref_ptr = GET_PTR( ref_xp );
918	cxy_t ref_cxy = GET_CXY( ref_xp );
919
920	// get number of open file descriptors from reference fd_array
921	uint32_t current = hal_remote_lw( XPTR( ref_cxy , &ref_ptr->fd_array.current ) );
922
923	return ( current >= CONFIG_PROCESS_FILE_MAX_NR );
924	}
925
926	/////////////////////////////////////////////////
927	error_t process_fd_register( process_t * process,
928	xptr_t file_xp,
929	uint32_t * fdid )
930	{
931	bool_t found;
932	uint32_t id;
933	xptr_t xp;
934
935	// get reference process cluster and local pointer
936	xptr_t ref_xp = process->ref_xp;
937	process_t * ref_ptr = GET_PTR( ref_xp );
938	cxy_t ref_cxy = GET_CXY( ref_xp );
939
940	// take lock protecting reference fd_array
941	remote_spinlock_lock( XPTR( ref_cxy , &ref_ptr->fd_array.lock ) );
942
943	found = false;
944
945	for ( id = 0; id < CONFIG_PROCESS_FILE_MAX_NR ; id++ )
946	{
947	xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->fd_array.array[id] ) );
948	if ( xp == XPTR_NULL )
949	{
950	found = true;
951	hal_remote_swd( XPTR( ref_cxy , &ref_ptr->fd_array.array[id] ) , file_xp );
952	hal_remote_atomic_add( XPTR( ref_cxy , &ref_ptr->fd_array.current ) , 1 );
953	*fdid = id;
954	break;
955	}
956	}
957
958	// release lock protecting reference fd_array
959	remote_spinlock_unlock( XPTR( ref_cxy , &ref_ptr->fd_array.lock ) );
960
961	if ( !found ) return -1;
962	else return 0;
963	}
964
965	////////////////////////////////////////////////
966	xptr_t process_fd_get_xptr( process_t * process,
967	uint32_t fdid )
968	{
969	xptr_t file_xp;
970
971	// access local copy of process descriptor
972	file_xp = process->fd_array.array[fdid];
973
974	if( file_xp == XPTR_NULL )
975	{
976	// get reference process cluster and local pointer
977	xptr_t ref_xp = process->ref_xp;
978	cxy_t ref_cxy = GET_CXY( ref_xp );
979	process_t * ref_ptr = GET_PTR( ref_xp );
980
981	// access reference process descriptor
982	file_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->fd_array.array[fdid] ) );
983
984	// update local fd_array if found
985	if( file_xp != XPTR_NULL )
986	{
987	process->fd_array.array[fdid] = file_xp;
988	}
989	}
990
991	return file_xp;
992
993	} // end process_fd_get_xptr()
994
995	///////////////////////////////////////////
996	void process_fd_remote_copy( xptr_t dst_xp,
997	xptr_t src_xp )
998	{
999	uint32_t fd;
1000	xptr_t entry;
1001
1002	// get cluster and local pointer for src fd_array
1003	cxy_t src_cxy = GET_CXY( src_xp );
1004	fd_array_t * src_ptr = GET_PTR( src_xp );
1005
1006	// get cluster and local pointer for dst fd_array
1007	cxy_t dst_cxy = GET_CXY( dst_xp );
1008	fd_array_t * dst_ptr = GET_PTR( dst_xp );
1009
1010	// get the remote lock protecting the src fd_array
1011	remote_spinlock_lock( XPTR( src_cxy , &src_ptr->lock ) );
1012
1013	// loop on all fd_array entries
1014	for( fd = 0 ; fd < CONFIG_PROCESS_FILE_MAX_NR ; fd++ )
1015	{
1016	entry = (xptr_t)hal_remote_lwd( XPTR( src_cxy , &src_ptr->array[fd] ) );
1017
1018	if( entry != XPTR_NULL )
1019	{
1020	// increment file descriptor refcount
1021	vfs_file_count_up( entry );
1022
1023	// copy entry in destination process fd_array
1024	hal_remote_swd( XPTR( dst_cxy , &dst_ptr->array[fd] ) , entry );
1025	}
1026	}
1027
1028	// release lock on source process fd_array
1029	remote_spinlock_unlock( XPTR( src_cxy , &src_ptr->lock ) );
1030
1031	} // end process_fd_remote_copy()
1032
1033	////////////////////////////////////////////////////////////////////////////////////
1034	// Thread related functions
1035	////////////////////////////////////////////////////////////////////////////////////
1036
1037	/////////////////////////////////////////////////////
1038	error_t process_register_thread( process_t * process,
1039	thread_t * thread,
1040	trdid_t * trdid )
1041	{
1042	ltid_t ltid;
1043	thread_type_t type;
1044	reg_t save_sr;
1045	bool_t found = false;
1046
1047
1048	assert( (process != NULL) , __FUNCTION__ , "process argument is NULL" );
1049
1050	assert( (thread != NULL) , __FUNCTION__ , "thread argument is NULL" );
1051
1052	// take lock protecting th_tbl, depending on thread type:
1053	// we don't want to use a descheduling policy for idle thread initialisation
1054	if( type == THREAD_IDLE ) spinlock_lock_busy( &process->th_lock , &save_sr );
1055	else spinlock_lock( &process->th_lock );
1056
1057	// search a free slot in th_tbl[]
1058	for( ltid = 0 ; ltid < CONFIG_THREAD_MAX_PER_CLUSTER ; ltid++ )
1059	{
1060	if( process->th_tbl[ltid] == NULL )
1061	{
1062	found = true;
1063	break;
1064	}
1065	}
1066
1067	if( found )
1068	{
1069	// register thread in th_tbl[]
1070	process->th_tbl[ltid] = thread;
1071	process->th_nr++;
1072
1073	// returns trdid
1074	*trdid = TRDID( local_cxy , ltid );
1075	}
1076
1077	// release lock protecting th_tbl
1078	hal_fence();
1079	if( type == THREAD_IDLE ) spinlock_unlock_busy( &process->th_lock , save_sr );
1080	else spinlock_unlock( &process->th_lock );
1081
1082	return (found) ? 0 : ENOMEM;
1083
1084	} // end process_register_thread()
1085
1086	/////////////////////////////////////////////////
1087	bool_t process_remove_thread( thread_t * thread )
1088	{
1089	uint32_t count; // number of threads in local process descriptor
1090
1091	assert( (thread != NULL) , __FUNCTION__ , "thread argument is NULL" );
1092
1093	process_t * process = thread->process;
1094
1095	// get thread local index
1096	ltid_t ltid = LTID_FROM_TRDID( thread->trdid );
1097
1098	// take lock protecting th_tbl
1099	spinlock_lock( &process->th_lock );
1100
1101	count = process->th_nr;
1102
1103	assert( (count > 0) , __FUNCTION__ , "process th_nr cannot be 0\n" );
1104
1105	// remove thread from th_tbl[]
1106	process->th_tbl[ltid] = NULL;
1107	process->th_nr = count-1;
1108
1109	// release lock protecting th_tbl
1110	hal_fence();
1111	spinlock_unlock( &process->th_lock );
1112
1113	return (count == 1);
1114
1115	} // end process_remove_thread()
1116
1117	/////////////////////////////////////////////////////////
1118	error_t process_make_fork( xptr_t parent_process_xp,
1119	xptr_t parent_thread_xp,
1120	pid_t * child_pid,
1121	thread_t ** child_thread )
1122	{
1123	process_t * process; // local pointer on child process descriptor
1124	thread_t * thread; // local pointer on child thread descriptor
1125	pid_t new_pid; // process identifier for child process
1126	pid_t parent_pid; // process identifier for parent process
1127	xptr_t ref_xp; // extended pointer on reference process
1128	xptr_t vfs_bin_xp; // extended pointer on .elf file
1129	error_t error;
1130
1131	// get cluster and local pointer for parent process
1132	cxy_t parent_process_cxy = GET_CXY( parent_process_xp );
1133	process_t * parent_process_ptr = GET_PTR( parent_process_xp );
1134
1135	// get parent process PID and extended pointer on .elf file
1136	parent_pid = hal_remote_lw (XPTR( parent_process_cxy , &parent_process_ptr->pid));
1137	vfs_bin_xp = hal_remote_lwd(XPTR( parent_process_cxy , &parent_process_ptr->vfs_bin_xp));
1138
1139	// check parent process is the reference process
1140	ref_xp = hal_remote_lwd( XPTR( parent_process_cxy , &parent_process_ptr->ref_xp ) );
1141
1142	assert( (parent_process_xp == ref_xp ) , __FUNCTION__ ,
1143	"parent process must be the reference process\n" );
1144
1145	#if DEBUG_PROCESS_MAKE_FORK
1146	uint32_t cycle = (uint32_t)hal_get_cycles();
1147	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1148	printk("\n[DBG] %s : thread %x in process %x enter / cluster %x / cycle %d\n",
1149	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, local_cxy, cycle );
1150	#endif
1151
1152	// allocate a process descriptor
1153	process = process_alloc();
1154	if( process == NULL )
1155	{
1156	printk("\n[ERROR] in %s : cannot get process in cluster %x\n",
1157	__FUNCTION__, local_cxy );
1158	return -1;
1159	}
1160
1161	// allocate a child PID from local cluster
1162	error = cluster_pid_alloc( process , &new_pid );
1163	if( error )
1164	{
1165	printk("\n[ERROR] in %s : cannot get PID in cluster %x\n",
1166	__FUNCTION__, local_cxy );
1167	process_free( process );
1168	return -1;
1169	}
1170
1171	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1172	cycle = (uint32_t)hal_get_cycles();
1173	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1174	printk("\n[DBG] %s : thread %x in process %x allocated process %x / cycle %d\n",
1175	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, new_pid, cycle );
1176	#endif
1177
1178	// initializes child process descriptor from parent process descriptor
1179	process_reference_init( process,
1180	new_pid,
1181	parent_process_xp );
1182
1183	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1184	cycle = (uint32_t)hal_get_cycles();
1185	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1186	printk("\n[DBG] %s : thread %x in process %x initialized child_process %x / cycle %d\n",
1187	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, new_pid, cycle );
1188	#endif
1189
1190	// give TXT ownership to child process
1191	process_txt_set_ownership( XPTR( local_cxy , process ) );
1192
1193	// copy VMM from parent descriptor to child descriptor
1194	error = vmm_fork_copy( process,
1195	parent_process_xp );
1196	if( error )
1197	{
1198	printk("\n[ERROR] in %s : cannot copy VMM in cluster %x\n",
1199	__FUNCTION__, local_cxy );
1200	process_free( process );
1201	cluster_pid_release( new_pid );
1202	return -1;
1203	}
1204
1205	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1206	cycle = (uint32_t)hal_get_cycles();
1207	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1208	printk("\n[DBG] %s : thread %x in process %x copied VMM from parent %x to child %x / cycle %d\n",
1209	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
1210	parent_pid, new_pid, cycle );
1211	#endif
1212
1213	// parent process gives TXT ownership to child process if required
1214	if( process_txt_is_owner(parent_process_xp) )
1215	{
1216	process_txt_set_ownership( XPTR( local_cxy , process ) );
1217
1218	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1219	cycle = (uint32_t)hal_get_cycles();
1220	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1221	printk("\n[DBG] %s : thread %x in process %x gives TXT from parent %x to child %x / cycle %d\n",
1222	__FUNCTION__ , CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
1223	parent_pid, new_pid, cycle );
1224	#endif
1225
1226	}
1227
1228	// update extended pointer on .elf file
1229	process->vfs_bin_xp = vfs_bin_xp;
1230
1231	// create child thread descriptor from parent thread descriptor
1232	error = thread_user_fork( parent_thread_xp,
1233	process,
1234	&thread );
1235	if( error )
1236	{
1237	printk("\n[ERROR] in %s : cannot create thread in cluster %x\n",
1238	__FUNCTION__, local_cxy );
1239	process_free( process );
1240	cluster_pid_release( new_pid );
1241	return -1;
1242	}
1243
1244	// check main thread LTID
1245	assert( (LTID_FROM_TRDID(thread->trdid) == 0) , __FUNCTION__ ,
1246	"main thread must have LTID == 0\n" );
1247
1248	//#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1249	#if DEBUG_PROCESS_MAKE_FORK
1250	cycle = (uint32_t)hal_get_cycles();
1251	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1252	printk("\n[DBG] %s : thread %x in process %x created main thread %x / cycle %d\n",
1253	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, thread, cycle );
1254	#endif
1255
1256	// set Copy_On_Write flag in parent process GPT
1257	// this includes all replicated GPT copies
1258	if( parent_process_cxy == local_cxy ) // reference is local
1259	{
1260	vmm_set_cow( parent_process_ptr );
1261	}
1262	else // reference is remote
1263	{
1264	rpc_vmm_set_cow_client( parent_process_cxy,
1265	parent_process_ptr );
1266	}
1267
1268	// set Copy_On_Write flag in child process GPT
1269	vmm_set_cow( process );
1270
1271	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1272	cycle = (uint32_t)hal_get_cycles();
1273	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1274	printk("\n[DBG] %s : thread %x in process %x set COW in parent and child / cycle %d\n",
1275	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, cycle );
1276	#endif
1277
1278	// get extended pointers on parent children_root, children_lock and children_nr
1279	xptr_t children_root_xp = XPTR( parent_process_cxy , &parent_process_ptr->children_root );
1280	xptr_t children_lock_xp = XPTR( parent_process_cxy , &parent_process_ptr->children_lock );
1281	xptr_t children_nr_xp = XPTR( parent_process_cxy , &parent_process_ptr->children_nr );
1282
1283	// register process in parent children list
1284	remote_spinlock_lock( children_lock_xp );
1285	xlist_add_last( children_root_xp , XPTR( local_cxy , &process->children_list ) );
1286	hal_remote_atomic_add( children_nr_xp , 1 );
1287	remote_spinlock_unlock( children_lock_xp );
1288
1289	// return success
1290	*child_thread = thread;
1291	*child_pid = new_pid;
1292
1293	#if DEBUG_PROCESS_MAKE_FORK
1294	cycle = (uint32_t)hal_get_cycles();
1295	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1296	printk("\n[DBG] %s : thread %x in process %x exit / created process %x / cycle %d\n",
1297	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, new_pid, cycle );
1298	#endif
1299
1300	return 0;
1301
1302	} // end process_make_fork()
1303
1304	/////////////////////////////////////////////////////
1305	error_t process_make_exec( exec_info_t * exec_info )
1306	{
1307	thread_t * thread; // local pointer on this thread
1308	process_t * process; // local pointer on this process
1309	pid_t pid; // this process identifier
1310	error_t error; // value returned by called functions
1311	char * path; // path to .elf file
1312	xptr_t file_xp; // extended pointer on .elf file descriptor
1313	uint32_t file_id; // file index in fd_array
1314	uint32_t args_nr; // number of main thread arguments
1315	char ** args_pointers; // array of pointers on main thread arguments
1316
1317	// get thread, process & PID
1318	thread = CURRENT_THREAD;
1319	process = thread->process;
1320	pid = process->pid;
1321
1322	// get relevant infos from exec_info
1323	path = exec_info->path;
1324	args_nr = exec_info->args_nr;
1325	args_pointers = exec_info->args_pointers;
1326
1327	#if DEBUG_PROCESS_MAKE_EXEC
1328	uint32_t cycle = (uint32_t)hal_get_cycles();
1329	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1330	printk("\n[DBG] %s : thread %x in process %x enters / path %s / cycle %d\n",
1331	__FUNCTION__, thread->trdid, pid, path, cycle );
1332	#endif
1333
1334	// open the file identified by <path>
1335	file_xp = XPTR_NULL;
1336	file_id = -1;
1337	error = vfs_open( process,
1338	path,
1339	O_RDONLY,
1340	0,
1341	&file_xp,
1342	&file_id );
1343	if( error )
1344	{
1345	printk("\n[ERROR] in %s : failed to open file <%s>\n", __FUNCTION__ , path );
1346	return -1;
1347	}
1348
1349	#if (DEBUG_PROCESS_MAKE_EXEC & 1)
1350	cycle = (uint32_t)hal_get_cycles();
1351	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1352	printk("\n[DBG] %s : thread %x in process %x opened file <%s> / cycle %d\n",
1353	__FUNCTION__, thread->trdid, pid, path, cycle );
1354	#endif
1355
1356	// delete all threads other than this main thread in all clusters
1357	process_sigaction( pid , DELETE_ALL_THREADS );
1358
1359	#if (DEBUG_PROCESS_MAKE_EXEC & 1)
1360	cycle = (uint32_t)hal_get_cycles();
1361	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1362	printk("\n[DBG] %s : thread %x in process %x deleted all threads / cycle %d\n",
1363	__FUNCTION__, thread->trdid, pid, cycle );
1364	#endif
1365
1366	// reset local process VMM
1367	vmm_destroy( process );
1368
1369	#if( DEBUG_PROCESS_MAKE_EXEC & 1 )
1370	cycle = (uint32_t)hal_get_cycles();
1371	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1372	printk("\n[DBG] %s : thread %x in process %x reset VMM / cycle %d\n",
1373	__FUNCTION__, thread->trdid, pid, cycle );
1374	#endif
1375
1376	// re-initialize the VMM (kentry/args/envs vsegs registration)
1377	error = vmm_init( process );
1378	if( error )
1379	{
1380	printk("\n[ERROR] in %s : cannot initialise VMM for %s\n", __FUNCTION__ , path );
1381	vfs_close( file_xp , file_id );
1382	// FIXME restore old process VMM
1383	return -1;
1384	}
1385
1386	#if( DEBUG_PROCESS_MAKE_EXEC & 1 )
1387	cycle = (uint32_t)hal_get_cycles();
1388	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1389	printk("\n[DBG] %s : thread %x in process %x / kentry/args/envs vsegs registered / cycle %d\n",
1390	__FUNCTION__, thread->trdid, pid, cycle );
1391	#endif
1392
1393	// register code & data vsegs as well as entry-point in process VMM,
1394	// and register extended pointer on .elf file in process descriptor
1395	error = elf_load_process( file_xp , process );
1396	if( error )
1397	{
1398	printk("\n[ERROR] in %s : failed to access <%s>\n", __FUNCTION__ , path );
1399	vfs_close( file_xp , file_id );
1400	// FIXME restore old process VMM
1401	return -1;
1402	}
1403
1404	#if( DEBUG_PROCESS_MAKE_EXEC & 1 )
1405	cycle = (uint32_t)hal_get_cycles();
1406	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1407	printk("\n[DBG] %s : thread %x in process %x / code/data vsegs registered / cycle %d\n",
1408	__FUNCTION__, thread->trdid, pid, cycle );
1409	#endif
1410
1411	// update the existing main thread descriptor... and jump to user code
1412	error = thread_user_exec( (void *)process->vmm.entry_point,
1413	args_nr,
1414	args_pointers );
1415	if( error )
1416	{
1417	printk("\n[ERROR] in %s : cannot update main thread for %s\n", __FUNCTION__ , path );
1418	vfs_close( file_xp , file_id );
1419	// FIXME restore old process VMM
1420	return -1;
1421	}
1422
1423	assert( false, __FUNCTION__, "we should not execute this code");
1424
1425	return 0;
1426
1427	} // end process_make_exec()
1428
1429
1430	///////////////////////////////////////////////
1431	void process_zero_create( process_t * process )
1432	{
1433
1434	#if DEBUG_PROCESS_ZERO_CREATE
1435	uint32_t cycle = (uint32_t)hal_get_cycles();
1436	if( DEBUG_PROCESS_ZERO_CREATE < cycle )
1437	printk("\n[DBG] %s : thread %x enter / cycle %d\n", __FUNCTION__, CURRENT_THREAD, cycle );
1438	#endif
1439
1440	// initialize PID, REF_XP, PARENT_XP, and STATE
1441	process->pid = 0;
1442	process->ref_xp = XPTR( local_cxy , process );
1443	process->owner_xp = XPTR( local_cxy , process );
1444	process->parent_xp = XPTR_NULL;
1445	process->term_state = 0;
1446
1447	// reset th_tbl[] array as empty
1448	uint32_t i;
1449	for( i = 0 ; i < CONFIG_THREAD_MAX_PER_CLUSTER ; i++ )
1450	{
1451	process->th_tbl[i] = NULL;
1452	}
1453	process->th_nr = 0;
1454	spinlock_init( &process->th_lock );
1455
1456	// reset children list as empty
1457	xlist_root_init( XPTR( local_cxy , &process->children_root ) );
1458	remote_spinlock_init( XPTR( local_cxy , &process->children_lock ) );
1459	process->children_nr = 0;
1460
1461	hal_fence();
1462
1463	#if DEBUG_PROCESS_ZERO_CREATE
1464	cycle = (uint32_t)hal_get_cycles();
1465	if( DEBUG_PROCESS_ZERO_CREATE < cycle )
1466	printk("\n[DBG] %s : thread %x exit / cycle %d\n", __FUNCTION__, CURRENT_THREAD, cycle );
1467	#endif
1468
1469	} // end process_zero_init()
1470
1471	//////////////////////////
1472	void process_init_create()
1473	{
1474	process_t * process; // local pointer on process descriptor
1475	pid_t pid; // process_init identifier
1476	thread_t * thread; // local pointer on main thread
1477	pthread_attr_t attr; // main thread attributes
1478	lid_t lid; // selected core local index for main thread
1479	xptr_t file_xp; // extended pointer on .elf file descriptor
1480	uint32_t file_id; // file index in fd_array
1481	error_t error;
1482
1483	#if DEBUG_PROCESS_INIT_CREATE
1484	uint32_t cycle = (uint32_t)hal_get_cycles();
1485	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1486	printk("\n[DBG] %s : thread %x in process %x enter / cycle %d\n",
1487	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, cycle );
1488	#endif
1489
1490	// allocates memory for process descriptor from local cluster
1491	process = process_alloc();
1492
1493	assert( (process != NULL), __FUNCTION__,
1494	"no memory for process descriptor in cluster %x\n", local_cxy );
1495
1496	// get PID from local cluster
1497	error = cluster_pid_alloc( process , &pid );
1498
1499	assert( (error == 0), __FUNCTION__,
1500	"cannot allocate PID in cluster %x\n", local_cxy );
1501
1502	assert( (pid == 1) , __FUNCTION__,
1503	"process INIT must be first process in cluster 0\n" );
1504
1505	// initialize process descriptor / parent is local process_zero
1506	process_reference_init( process,
1507	pid,
1508	XPTR( local_cxy , &process_zero ) );
1509
1510	// open the file identified by CONFIG_PROCESS_INIT_PATH
1511	file_xp = XPTR_NULL;
1512	file_id = -1;
1513	error = vfs_open( process,
1514	CONFIG_PROCESS_INIT_PATH,
1515	O_RDONLY,
1516	0,
1517	&file_xp,
1518	&file_id );
1519
1520	assert( (error == 0), __FUNCTION__,
1521	"failed to open file <%s>\n", CONFIG_PROCESS_INIT_PATH );
1522
1523	// register "code" and "data" vsegs as well as entry-point
1524	// in process VMM, using information contained in the elf file.
1525	error = elf_load_process( file_xp , process );
1526
1527	assert( (error == 0), __FUNCTION__,
1528	"cannot access .elf file <%s>\n", CONFIG_PROCESS_INIT_PATH );
1529
1530	// get extended pointers on process_zero children_root, children_lock
1531	xptr_t children_root_xp = XPTR( local_cxy , &process_zero.children_root );
1532	xptr_t children_lock_xp = XPTR( local_cxy , &process_zero.children_lock );
1533
1534	// register process INIT in parent local process_zero
1535	remote_spinlock_lock( children_lock_xp );
1536	xlist_add_last( children_root_xp , XPTR( local_cxy , &process->children_list ) );
1537	hal_atomic_add( &process_zero.children_nr , 1 );
1538	remote_spinlock_unlock( children_lock_xp );
1539
1540	// select a core in local cluster to execute the main thread
1541	lid = cluster_select_local_core();
1542
1543	// initialize pthread attributes for main thread
1544	attr.attributes = PT_ATTR_DETACH \| PT_ATTR_CLUSTER_DEFINED \| PT_ATTR_CORE_DEFINED;
1545	attr.cxy = local_cxy;
1546	attr.lid = lid;
1547
1548	// create and initialize thread descriptor
1549	error = thread_user_create( pid,
1550	(void *)process->vmm.entry_point,
1551	NULL,
1552	&attr,
1553	&thread );
1554
1555	assert( (error == 0), __FUNCTION__,
1556	"cannot create main thread for <%s>\n", CONFIG_PROCESS_INIT_PATH );
1557
1558	assert( (thread->trdid == 0), __FUNCTION__,
1559	"main thread must have index 0 for <%s>\n", CONFIG_PROCESS_INIT_PATH );
1560
1561	// activate thread
1562	thread_unblock( XPTR( local_cxy , thread ) , THREAD_BLOCKED_GLOBAL );
1563
1564	hal_fence();
1565
1566	#if DEBUG_PROCESS_INIT_CREATE
1567	cycle = (uint32_t)hal_get_cycles();
1568	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1569	printk("\n[DBG] %s : thread %x in process %x exit / cycle %d\n",
1570	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, cycle );
1571	#endif
1572
1573	} // end process_init_create()
1574
1575	/////////////////////////////////////////
1576	void process_display( xptr_t process_xp )
1577	{
1578	process_t * process_ptr;
1579	cxy_t process_cxy;
1580
1581	xptr_t parent_xp; // extended pointer on parent process
1582	process_t * parent_ptr;
1583	cxy_t parent_cxy;
1584
1585	xptr_t owner_xp; // extended pointer on owner process
1586	process_t * owner_ptr;
1587	cxy_t owner_cxy;
1588
1589	pid_t pid;
1590	pid_t ppid;
1591	uint32_t state;
1592	uint32_t th_nr;
1593
1594	xptr_t txt_file_xp; // extended pointer on TXT_RX file descriptor
1595	xptr_t txt_chdev_xp; // extended pointer on TXT_RX chdev
1596	chdev_t * txt_chdev_ptr;
1597	cxy_t txt_chdev_cxy;
1598	xptr_t txt_owner_xp; // extended pointer on TXT owner process
1599
1600	xptr_t elf_file_xp; // extended pointer on .elf file
1601	cxy_t elf_file_cxy;
1602	vfs_file_t * elf_file_ptr;
1603	vfs_inode_t * elf_inode_ptr; // local pointer on .elf inode
1604
1605	char txt_name[CONFIG_VFS_MAX_NAME_LENGTH];
1606	char elf_name[CONFIG_VFS_MAX_NAME_LENGTH];
1607
1608	// get cluster and local pointer on process
1609	process_ptr = GET_PTR( process_xp );
1610	process_cxy = GET_CXY( process_xp );
1611
1612	// get PID and state
1613	pid = hal_remote_lw( XPTR( process_cxy , &process_ptr->pid ) );
1614	state = hal_remote_lw( XPTR( process_cxy , &process_ptr->term_state ) );
1615
1616	// get PPID
1617	parent_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->parent_xp ) );
1618	parent_cxy = GET_CXY( parent_xp );
1619	parent_ptr = GET_PTR( parent_xp );
1620	ppid = hal_remote_lw( XPTR( parent_cxy , &parent_ptr->pid ) );
1621
1622	// get number of threads
1623	th_nr = hal_remote_lw( XPTR( process_cxy , &process_ptr->th_nr ) );
1624
1625	// get pointers on owner process descriptor
1626	owner_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->owner_xp ) );
1627	owner_cxy = GET_CXY( owner_xp );
1628	owner_ptr = GET_PTR( owner_xp );
1629
1630	// get extended pointer on TXT_RX file descriptor attached to process
1631	txt_file_xp = hal_remote_lwd( XPTR( owner_cxy , &owner_ptr->fd_array.array[0] ) );
1632
1633	assert( (txt_file_xp != XPTR_NULL) , __FUNCTION__ ,
1634	"process must be attached to one TXT terminal\n" );
1635
1636	// get TXT_RX chdev pointers
1637	txt_chdev_xp = chdev_from_file( txt_file_xp );
1638	txt_chdev_cxy = GET_CXY( txt_chdev_xp );
1639	txt_chdev_ptr = GET_PTR( txt_chdev_xp );
1640
1641	// get TXT_RX name and ownership
1642	hal_remote_strcpy( XPTR( local_cxy , txt_name ) ,
1643	XPTR( txt_chdev_cxy , txt_chdev_ptr->name ) );
1644
1645	txt_owner_xp = (xptr_t)hal_remote_lwd( XPTR( txt_chdev_cxy,
1646	&txt_chdev_ptr->ext.txt.owner_xp ) );
1647
1648	// get process .elf name
1649	elf_file_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->vfs_bin_xp ) );
1650	elf_file_cxy = GET_CXY( elf_file_xp );
1651	elf_file_ptr = (vfs_file_t *)GET_PTR( elf_file_xp );
1652	elf_inode_ptr = (vfs_inode_t *)hal_remote_lpt( XPTR( elf_file_cxy , &elf_file_ptr->inode ) );
1653	vfs_inode_get_name( XPTR( elf_file_cxy , elf_inode_ptr ) , elf_name );
1654
1655	// display process info
1656	if( txt_owner_xp == process_xp )
1657	{
1658	nolock_printk("PID %X \| PPID %X \| TS %X \| %s (FG) \| %X \| %d \| %s\n",
1659	pid, ppid, state, txt_name, process_ptr, th_nr, elf_name );
1660	}
1661	else
1662	{
1663	nolock_printk("PID %X \| PPID %X \| TS %X \| %s (BG) \| %X \| %d \| %s\n",
1664	pid, ppid, state, txt_name, process_ptr, th_nr, elf_name );
1665	}
1666	} // end process_display()
1667
1668
1669	////////////////////////////////////////////////////////////////////////////////////////
1670	// Terminals related functions
1671	////////////////////////////////////////////////////////////////////////////////////////
1672
1673	////////////////////////////
1674	uint32_t process_txt_alloc()
1675	{
1676	uint32_t index; // TXT terminal index
1677	xptr_t chdev_xp; // extended pointer on TXT_RX chdev
1678	chdev_t * chdev_ptr; // local pointer on TXT_RX chdev
1679	cxy_t chdev_cxy; // TXT_RX chdev cluster
1680	xptr_t root_xp; // extended pointer on owner field in chdev
1681
1682	// scan the user TXT_RX chdevs (TXT0 is reserved for kernel)
1683	for( index = 1 ; index < LOCAL_CLUSTER->nb_txt_channels ; index ++ )
1684	{
1685	// get pointers on TXT_RX[index]
1686	chdev_xp = chdev_dir.txt_rx[index];
1687	chdev_cxy = GET_CXY( chdev_xp );
1688	chdev_ptr = GET_PTR( chdev_xp );
1689
1690	// get extended pointer on root of attached process
1691	root_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.root );
1692
1693	// return free TXT index if found
1694	if( xlist_is_empty( root_xp ) ) return index;
1695	}
1696
1697	assert( false , __FUNCTION__ , "no free TXT terminal found" );
1698
1699	return -1;
1700
1701	} // end process_txt_alloc()
1702
1703	/////////////////////////////////////////////
1704	void process_txt_attach( process_t * process,
1705	uint32_t txt_id )
1706	{
1707	xptr_t chdev_xp; // extended pointer on TXT_RX chdev
1708	cxy_t chdev_cxy; // TXT_RX chdev cluster
1709	chdev_t * chdev_ptr; // local pointer on TXT_RX chdev
1710	xptr_t root_xp; // extended pointer on list root in chdev
1711	xptr_t lock_xp; // extended pointer on list lock in chdev
1712
1713	// check process is in owner cluster
1714	assert( (CXY_FROM_PID( process->pid ) == local_cxy) , __FUNCTION__ ,
1715	"process descriptor not in owner cluster" );
1716
1717	// check terminal index
1718	assert( (txt_id < LOCAL_CLUSTER->nb_txt_channels) ,
1719	__FUNCTION__ , "illegal TXT terminal index" );
1720
1721	// get pointers on TXT_RX[txt_id] chdev
1722	chdev_xp = chdev_dir.txt_rx[txt_id];
1723	chdev_cxy = GET_CXY( chdev_xp );
1724	chdev_ptr = GET_PTR( chdev_xp );
1725
1726	// get extended pointer on root & lock of attached process list
1727	root_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.root );
1728	lock_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.lock );
1729
1730	// insert process in attached process list
1731	remote_spinlock_lock( lock_xp );
1732	xlist_add_last( root_xp , XPTR( local_cxy , &process->txt_list ) );
1733	remote_spinlock_unlock( lock_xp );
1734
1735	#if DEBUG_PROCESS_TXT
1736	uint32_t cycle = (uint32_t)hal_get_cycles();
1737	if( DEBUG_PROCESS_TXT < cycle )
1738	printk("\n[DBG] %s : thread %x in process %x attached process %x to TXT %d / cycle %d\n",
1739	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
1740	process->pid, txt_id , cycle );
1741	#endif
1742
1743	} // end process_txt_attach()
1744
1745	/////////////////////////////////////////////
1746	void process_txt_detach( xptr_t process_xp )
1747	{
1748	process_t * process_ptr; // local pointer on process in owner cluster
1749	cxy_t process_cxy; // process owner cluster
1750	pid_t process_pid; // process identifier
1751	xptr_t file_xp; // extended pointer on stdin file
1752	xptr_t chdev_xp; // extended pointer on TXT_RX chdev
1753	cxy_t chdev_cxy; // TXT_RX chdev cluster
1754	chdev_t * chdev_ptr; // local pointer on TXT_RX chdev
1755	xptr_t lock_xp; // extended pointer on list lock in chdev
1756
1757	// get process cluster, local pointer, and PID
1758	process_cxy = GET_CXY( process_xp );
1759	process_ptr = GET_PTR( process_xp );
1760
1761	// check process descriptor in owner cluster
1762	process_pid = hal_remote_lw( XPTR( process_cxy , &process_ptr->pid ) );
1763	assert( (CXY_FROM_PID( process_pid ) == process_cxy ) , __FUNCTION__ ,
1764	"process descriptor not in owner cluster" );
1765
1766	// release TXT ownership (does nothing if not TXT owner)
1767	process_txt_transfer_ownership( process_xp );
1768
1769	// get extended pointer on process stdin file
1770	file_xp = (xptr_t)hal_remote_lwd( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
1771
1772	// get pointers on TXT_RX chdev
1773	chdev_xp = chdev_from_file( file_xp );
1774	chdev_cxy = GET_CXY( chdev_xp );
1775	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
1776
1777	// get extended pointer on lock protecting attached process list
1778	lock_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.lock );
1779
1780	// unlink process from attached process list
1781	remote_spinlock_lock( lock_xp );
1782	xlist_unlink( XPTR( process_cxy , &process_ptr->txt_list ) );
1783	remote_spinlock_unlock( lock_xp );
1784
1785	#if DEBUG_PROCESS_TXT
1786	uint32_t cycle = (uint32_t)hal_get_cycles();
1787	uint32_t txt_id = hal_remote_lw( XPTR( chdev_cxy , &chdev_ptr->channel ) );
1788	if( DEBUG_PROCESS_TXT < cycle )
1789	printk("\n[DBG] %s : thread %x in process %x detached process %x from TXT %d / cycle %d\n",
1790	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
1791	process_pid, txt_id, cycle );
1792	#endif
1793
1794	} // end process_txt_detach()
1795
1796	///////////////////////////////////////////////////
1797	void process_txt_set_ownership( xptr_t process_xp )
1798	{
1799	process_t * process_ptr;
1800	cxy_t process_cxy;
1801	pid_t process_pid;
1802	xptr_t file_xp;
1803	xptr_t txt_xp;
1804	chdev_t * txt_ptr;
1805	cxy_t txt_cxy;
1806
1807	// get pointers on process in owner cluster
1808	process_cxy = GET_CXY( process_xp );
1809	process_ptr = GET_PTR( process_xp );
1810	process_pid = hal_remote_lw( XPTR( process_cxy , &process_ptr->pid ) );
1811
1812	// check owner cluster
1813	assert( (process_cxy == CXY_FROM_PID( process_pid )) , __FUNCTION__,
1814	"process descriptor not in owner cluster\n" );
1815
1816	// get extended pointer on stdin pseudo file
1817	file_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
1818
1819	// get pointers on TXT chdev
1820	txt_xp = chdev_from_file( file_xp );
1821	txt_cxy = GET_CXY( txt_xp );
1822	txt_ptr = GET_PTR( txt_xp );
1823
1824	// set owner field in TXT chdev
1825	hal_remote_swd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , process_xp );
1826
1827	#if DEBUG_PROCESS_TXT
1828	uint32_t cycle = (uint32_t)hal_get_cycles();
1829	uint32_t txt_id = hal_remote_lw( XPTR( txt_cxy , &txt_ptr->channel ) );
1830	if( DEBUG_PROCESS_TXT < cycle )
1831	printk("\n[DBG] %s : thread %x in process %x give TXT %d to process %x / cycle %d\n",
1832	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, txt_id, process_pid, cycle );
1833	#endif
1834
1835	} // end process_txt_set ownership()
1836
1837	////////////////////////////////////////////////////////
1838	void process_txt_transfer_ownership( xptr_t process_xp )
1839	{
1840	process_t * process_ptr; // local pointer on process releasing ownership
1841	cxy_t process_cxy; // process cluster
1842	pid_t process_pid; // process identifier
1843	xptr_t file_xp; // extended pointer on TXT_RX pseudo file
1844	xptr_t txt_xp; // extended pointer on TXT_RX chdev
1845	chdev_t * txt_ptr; // local pointer on TXT_RX chdev
1846	cxy_t txt_cxy; // cluster of TXT_RX chdev
1847	uint32_t txt_id; // TXT_RX channel
1848	xptr_t owner_xp; // extended pointer on current TXT_RX owner
1849	xptr_t root_xp; // extended pointer on root of attached process list
1850	xptr_t lock_xp; // extended pointer on lock protecting attached process list
1851	xptr_t iter_xp; // iterator for xlist
1852	xptr_t current_xp; // extended pointer on current process
1853	process_t * current_ptr; // local pointer on current process
1854	cxy_t current_cxy; // cluster for current process
1855
1856	#if DEBUG_PROCESS_TXT
1857	uint32_t cycle;
1858	#endif
1859
1860	// get pointers on process in owner cluster
1861	process_cxy = GET_CXY( process_xp );
1862	process_ptr = GET_PTR( process_xp );
1863	process_pid = hal_remote_lw( XPTR( process_cxy , &process_ptr->pid ) );
1864
1865	// check owner cluster
1866	assert( (process_cxy == CXY_FROM_PID( process_pid )) , __FUNCTION__,
1867	"process descriptor not in owner cluster\n" );
1868
1869	// get extended pointer on stdin pseudo file
1870	file_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
1871
1872	// get pointers on TXT chdev
1873	txt_xp = chdev_from_file( file_xp );
1874	txt_cxy = GET_CXY( txt_xp );
1875	txt_ptr = GET_PTR( txt_xp );
1876
1877	// get extended pointer on TXT_RX owner and TXT channel
1878	owner_xp = hal_remote_lwd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) );
1879	txt_id = hal_remote_lw ( XPTR( txt_cxy , &txt_ptr->channel ) );
1880
1881	// transfer ownership only if process is the TXT owner
1882	if( (owner_xp == process_xp) && (txt_id > 0) )
1883	{
1884	// get extended pointers on root and lock of attached processes list
1885	root_xp = XPTR( txt_cxy , &txt_ptr->ext.txt.root );
1886	lock_xp = XPTR( txt_cxy , &txt_ptr->ext.txt.lock );
1887
1888	// get lock
1889	remote_spinlock_lock( lock_xp );
1890
1891	if( process_get_ppid( process_xp ) != 1 ) // process is not KSH
1892	{
1893	// scan attached process list to find KSH process
1894	XLIST_FOREACH( root_xp , iter_xp )
1895	{
1896	current_xp = XLIST_ELEMENT( iter_xp , process_t , txt_list );
1897	current_cxy = GET_CXY( current_xp );
1898	current_ptr = GET_PTR( current_xp );
1899
1900	if( process_get_ppid( current_xp ) == 1 ) // current is KSH
1901	{
1902	// release lock
1903	remote_spinlock_unlock( lock_xp );
1904
1905	// set owner field in TXT chdev
1906	hal_remote_swd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , current_xp );
1907
1908	#if DEBUG_PROCESS_TXT
1909	cycle = (uint32_t)hal_get_cycles();
1910	uint32_t ksh_pid = hal_remote_lw( XPTR( current_cxy , &current_ptr->pid ) );
1911	if( DEBUG_PROCESS_TXT < cycle )
1912	printk("\n[DBG] %s : thread %x in process %x release TXT %d to KSH %x / cycle %d\n",
1913	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, txt_id, ksh_pid, cycle );
1914	process_txt_display( txt_id );
1915	#endif
1916	return;
1917	}
1918	}
1919
1920	// release lock
1921	remote_spinlock_unlock( lock_xp );
1922
1923	// PANIC if KSH not found
1924	assert( false , __FUNCTION__ , "KSH process not found for TXT %d" );
1925
1926	return;
1927	}
1928	else // process is KSH
1929	{
1930	// scan attached process list to find another process
1931	XLIST_FOREACH( root_xp , iter_xp )
1932	{
1933	current_xp = XLIST_ELEMENT( iter_xp , process_t , txt_list );
1934	current_cxy = GET_CXY( current_xp );
1935	current_ptr = GET_PTR( current_xp );
1936
1937	if( current_xp != process_xp ) // current is not KSH
1938	{
1939	// release lock
1940	remote_spinlock_unlock( lock_xp );
1941
1942	// set owner field in TXT chdev
1943	hal_remote_swd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , current_xp );
1944
1945	#if DEBUG_PROCESS_TXT
1946	cycle = (uint32_t)hal_get_cycles();
1947	uint32_t new_pid = hal_remote_lw( XPTR( current_cxy , &current_ptr->pid ) );
1948	if( DEBUG_PROCESS_TXT < cycle )
1949	printk("\n[DBG] %s : thread %x in process %x release TXT %d to process %x / cycle %d\n",
1950	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, txt_id, new_pid, cycle );
1951	process_txt_display( txt_id );
1952	#endif
1953	return;
1954	}
1955	}
1956
1957	// release lock
1958	remote_spinlock_unlock( lock_xp );
1959
1960	// no more owner for TXT if no other process found
1961	hal_remote_swd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , XPTR_NULL );
1962
1963	#if DEBUG_PROCESS_TXT
1964	cycle = (uint32_t)hal_get_cycles();
1965	if( DEBUG_PROCESS_TXT < cycle )
1966	printk("\n[DBG] %s : thread %x in process %x release TXT %d to nobody / cycle %d\n",
1967	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, txt_id, cycle );
1968	process_txt_display( txt_id );
1969	#endif
1970	return;
1971	}
1972	}
1973	else
1974	{
1975
1976	#if DEBUG_PROCESS_TXT
1977	cycle = (uint32_t)hal_get_cycles();
1978	if( DEBUG_PROCESS_TXT < cycle )
1979	printk("\n[DBG] %s : thread %x in process %d does nothing (not TXT owner) / cycle %d\n",
1980	__FUNCTION__, CURRENT_THREAD->trdid, process_pid, cycle );
1981	process_txt_display( txt_id );
1982	#endif
1983
1984	}
1985	} // end process_txt_transfer_ownership()
1986
1987
1988	//////////////////////////////////////////////////
1989	uint32_t process_txt_is_owner( xptr_t process_xp )
1990	{
1991	// get local pointer and cluster of process in owner cluster
1992	cxy_t process_cxy = GET_CXY( process_xp );
1993	process_t * process_ptr = GET_PTR( process_xp );
1994
1995	// check owner cluster
1996	pid_t process_pid = hal_remote_lw( XPTR( process_cxy , &process_ptr->pid ) );
1997	assert( (process_cxy == CXY_FROM_PID( process_pid )) , __FUNCTION__,
1998	"process descriptor not in owner cluster\n" );
1999
2000	// get extended pointer on stdin pseudo file
2001	xptr_t file_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
2002
2003	// get pointers on TXT chdev
2004	xptr_t txt_xp = chdev_from_file( file_xp );
2005	cxy_t txt_cxy = GET_CXY( txt_xp );
2006	chdev_t * txt_ptr = GET_PTR( txt_xp );
2007
2008	// get extended pointer on TXT_RX owner process
2009	xptr_t owner_xp = hal_remote_lwd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) );
2010
2011	return (process_xp == owner_xp);
2012
2013	} // end process_txt_is_owner()
2014
2015	////////////////////////////////////////////////
2016	xptr_t process_txt_get_owner( uint32_t channel )
2017	{
2018	xptr_t txt_rx_xp = chdev_dir.txt_rx[channel];
2019	cxy_t txt_rx_cxy = GET_CXY( txt_rx_xp );
2020	chdev_t * txt_rx_ptr = GET_PTR( txt_rx_xp );
2021
2022	return (xptr_t)hal_remote_lwd( XPTR( txt_rx_cxy , &txt_rx_ptr->ext.txt.owner_xp ) );
2023
2024	} // end process_txt_get_owner()
2025
2026	///////////////////////////////////////////
2027	void process_txt_display( uint32_t txt_id )
2028	{
2029	xptr_t chdev_xp;
2030	cxy_t chdev_cxy;
2031	chdev_t * chdev_ptr;
2032	xptr_t root_xp;
2033	xptr_t lock_xp;
2034	xptr_t current_xp;
2035	xptr_t iter_xp;
2036	cxy_t txt0_cxy;
2037	chdev_t * txt0_ptr;
2038	xptr_t txt0_xp;
2039	xptr_t txt0_lock_xp;
2040	reg_t txt0_save_sr; // save SR to take TXT0 lock in busy mode
2041
2042	assert( (txt_id < LOCAL_CLUSTER->nb_txt_channels) ,
2043	__FUNCTION__ , "illegal TXT terminal index" );
2044
2045	// get pointers on TXT0 chdev
2046	txt0_xp = chdev_dir.txt_tx[0];
2047	txt0_cxy = GET_CXY( txt0_xp );
2048	txt0_ptr = GET_PTR( txt0_xp );
2049
2050	// get extended pointer on TXT0 lock
2051	txt0_lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
2052
2053	// get pointers on TXT_RX[txt_id] chdev
2054	chdev_xp = chdev_dir.txt_rx[txt_id];
2055	chdev_cxy = GET_CXY( chdev_xp );
2056	chdev_ptr = GET_PTR( chdev_xp );
2057
2058	// get extended pointer on root & lock of attached process list
2059	root_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.root );
2060	lock_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.lock );
2061
2062	// get lock on attached process list
2063	remote_spinlock_lock( lock_xp );
2064
2065	// get TXT0 lock in busy waiting mode
2066	remote_spinlock_lock_busy( txt0_lock_xp , &txt0_save_sr );
2067
2068	// display header
2069	nolock_printk("\n***** processes attached to TXT_%d / cycle %d\n",
2070	txt_id , (uint32_t)hal_get_cycles() );
2071
2072	// scan attached process list
2073	XLIST_FOREACH( root_xp , iter_xp )
2074	{
2075	current_xp = XLIST_ELEMENT( iter_xp , process_t , txt_list );
2076	process_display( current_xp );
2077	}
2078
2079	// release TXT0 lock in busy waiting mode
2080	remote_spinlock_unlock_busy( txt0_lock_xp , txt0_save_sr );
2081
2082	// release lock on attached process list
2083	remote_spinlock_unlock( lock_xp );
2084
2085	} // end process_txt_display

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