Context Navigation

process.c @ 535

Last change on this file since 535 was 527, checked in by viala@…, 6 years ago

Rewrite if-then-else return function into switch case.

For safety reason and performance:

1) Safety: GCC complain with a warning if you forgot an enum variant.
2) code-gen just outperform naive if-then-else.

File size: 72.7 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( void )
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) , "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) , "cannot open stdin pseudo file" );
178	assert( (stdin_id == 0) , "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) , "cannot open stdout pseudo file" );
196	assert( (stdout_id == 1) , "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) , "cannot open stderr pseudo file" );
214	assert( (stderr_id == 2) , "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) , "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) ,
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	const char * process_action_str( process_sigactions_t action_type )
459	{
460	switch ( action_type ) {
461	case BLOCK_ALL_THREADS: return "BLOCK";
462	case UNBLOCK_ALL_THREADS: return "UNBLOCK";
463	case DELETE_ALL_THREADS: return "DELETE";
464	default: return "undefined";
465	}
466	}
467
468	////////////////////////////////////////
469	void process_sigaction( pid_t pid,
470	uint32_t type )
471	{
472	cxy_t owner_cxy; // owner cluster identifier
473	lpid_t lpid; // process index in owner cluster
474	cluster_t * cluster; // pointer on cluster manager
475	xptr_t root_xp; // extended pointer on root of copies
476	xptr_t lock_xp; // extended pointer on lock protecting copies
477	xptr_t iter_xp; // iterator on copies list
478	xptr_t process_xp; // extended pointer on process copy
479	cxy_t process_cxy; // process copy cluster identifier
480	process_t * process_ptr; // local pointer on process copy
481	reg_t save_sr; // for critical section
482	rpc_desc_t rpc; // shared RPC descriptor
483	thread_t * client; // pointer on client thread
484	xptr_t client_xp; // extended pointer on client thread
485	process_t * local; // pointer on process copy in local cluster
486	uint32_t remote_nr; // number of remote process copies
487
488	client = CURRENT_THREAD;
489	client_xp = XPTR( local_cxy , client );
490	local = NULL;
491	remote_nr = 0;
492
493	#if DEBUG_PROCESS_SIGACTION
494	uint32_t cycle = (uint32_t)hal_get_cycles();
495	if( DEBUG_PROCESS_SIGACTION < cycle )
496	printk("\n[DBG] %s : thread %x in process %x enter to %s process %x / cycle %d\n",
497	__FUNCTION__ , client->trdid, client->process->pid,
498	process_action_str( type ) , pid , cycle );
499	#endif
500
501	// get pointer on local cluster manager
502	cluster = LOCAL_CLUSTER;
503
504	// get owner cluster identifier and process lpid
505	owner_cxy = CXY_FROM_PID( pid );
506	lpid = LPID_FROM_PID( pid );
507
508	// get root of list of copies, lock, and number of copies from owner cluster
509	root_xp = XPTR( owner_cxy , &cluster->pmgr.copies_root[lpid] );
510	lock_xp = XPTR( owner_cxy , &cluster->pmgr.copies_lock[lpid] );
511
512	// check action type
513	assert( ((type == DELETE_ALL_THREADS ) \|\|
514	(type == BLOCK_ALL_THREADS ) \|\|
515	(type == UNBLOCK_ALL_THREADS )), "illegal action type" );
516
517
518	// The client thread send parallel RPCs to all remote clusters containing
519	// target process copies, wait all responses, and then handles directly the
520	// threads in local cluster, when required.
521	// The client thread allocates a - shared - RPC descriptor in the stack,
522	// because all parallel, non-blocking, server threads use the same input
523	// arguments, and use the shared RPC response field
524
525	// mask IRQs
526	hal_disable_irq( &save_sr);
527
528	// client thread blocks itself
529	thread_block( client_xp , THREAD_BLOCKED_RPC );
530
531	// take the lock protecting the copies
532	remote_spinlock_lock( lock_xp );
533
534	// initialize shared RPC descriptor
535	rpc.responses = 0;
536	rpc.blocking = false;
537	rpc.index = RPC_PROCESS_SIGACTION;
538	rpc.thread = client;
539	rpc.lid = client->core->lid;
540	rpc.args[0] = type;
541	rpc.args[1] = pid;
542
543	// scan list of process copies
544	// to send RPCs to remote copies
545	XLIST_FOREACH( root_xp , iter_xp )
546	{
547	// get extended pointers and cluster on process
548	process_xp = XLIST_ELEMENT( iter_xp , process_t , copies_list );
549	process_cxy = GET_CXY( process_xp );
550	process_ptr = GET_PTR( process_xp );
551
552	if( process_cxy == local_cxy ) // process is local
553	{
554	local = process_ptr;
555	}
556	else // process is remote
557	{
558	// update number of remote process copies
559	remote_nr++;
560
561	// atomically increment responses counter
562	hal_atomic_add( (void *)&rpc.responses , 1 );
563
564	#if DEBUG_PROCESS_SIGACTION
565	if( DEBUG_PROCESS_SIGACTION < cycle )
566	printk("\n[DBG] %s : thread %x in process %x handles remote process %x in cluster %x\n",
567	__FUNCTION__, client->trdid, client->process->pid, pid , process_cxy );
568	#endif
569	// call RPC in target cluster
570	rpc_process_sigaction_client( process_cxy , &rpc );
571	}
572	} // end list of copies
573
574	// release the lock protecting process copies
575	remote_spinlock_unlock( lock_xp );
576
577	// restore IRQs
578	hal_restore_irq( save_sr);
579
580	// - if there is remote process copies, the client thread deschedules,
581	// (it will be unblocked by the last RPC server thread).
582	// - if there is no remote copies, the client thread unblock itself.
583	if( remote_nr )
584	{
585	sched_yield("blocked on rpc_process_sigaction");
586	}
587	else
588	{
589	thread_unblock( client_xp , THREAD_BLOCKED_RPC );
590	}
591
592	// handle the local process copy if required
593	if( local != NULL )
594	{
595
596	#if DEBUG_PROCESS_SIGACTION
597	if( DEBUG_PROCESS_SIGACTION < cycle )
598	printk("\n[DBG] %s : thread %x in process %x handles local process %x in cluster %x\n",
599	__FUNCTION__, client->trdid, client->process->pid, pid , local_cxy );
600	#endif
601	if (type == DELETE_ALL_THREADS ) process_delete_threads ( local , client_xp );
602	else if(type == BLOCK_ALL_THREADS ) process_block_threads ( local , client_xp );
603	else if(type == UNBLOCK_ALL_THREADS ) process_unblock_threads( local );
604	}
605
606	#if DEBUG_PROCESS_SIGACTION
607	cycle = (uint32_t)hal_get_cycles();
608	if( DEBUG_PROCESS_SIGACTION < cycle )
609	printk("\n[DBG] %s : thread %x in process %x exit after %s process %x / cycle %d\n",
610	__FUNCTION__, client->trdid, client->process->pid,
611	process_action_str( type ), pid, cycle );
612	#endif
613
614	} // end process_sigaction()
615
616	/////////////////////////////////////////////////
617	void process_block_threads( process_t * process,
618	xptr_t client_xp )
619	{
620	thread_t * target; // pointer on target thread
621	thread_t * this; // pointer on calling thread
622	uint32_t ltid; // index in process th_tbl
623	cxy_t owner_cxy; // target process owner cluster
624	uint32_t count; // requests counter
625	volatile uint32_t ack_count; // scheduler acknowledge counter
626
627	// get calling thread pointer
628	this = CURRENT_THREAD;
629
630	// get target process owner cluster
631	owner_cxy = CXY_FROM_PID( process->pid );
632
633	#if DEBUG_PROCESS_SIGACTION
634	uint32_t cycle = (uint32_t)hal_get_cycles();
635	if( DEBUG_PROCESS_SIGACTION < cycle )
636	printk("\n[DBG] %s : thread %x enter for process %x in cluster %x / cycle %d\n",
637	__FUNCTION__ , this , process->pid , local_cxy , cycle );
638	#endif
639
640	// get lock protecting process th_tbl[]
641	spinlock_lock( &process->th_lock );
642
643	// loop on target process local threads
644	// we use both "ltid" and "count" because it can exist "holes" in th_tbl
645	for( ltid = 0 , count = 0 , ack_count = 0 ; count < process->th_nr ; ltid++ )
646	{
647	target = process->th_tbl[ltid];
648
649	if( target != NULL ) // thread exist
650	{
651	count++;
652
653	// main thread and client thread should not be blocked
654	if( ((ltid != 0) \|\| (owner_cxy != local_cxy)) && // not main thread
655	(client_xp) != XPTR( local_cxy , target ) ) // not client thread
656	{
657	// set the global blocked bit in target thread descriptor.
658	thread_block( XPTR( local_cxy , target ) , THREAD_BLOCKED_GLOBAL );
659
660	// - if the calling thread and the target thread are on the same core,
661	// we don't need confirmation from scheduler,
662	// - if the calling thread and the target thread are not running on the same
663	// core, we ask the target scheduler to acknowlege the blocking
664	// to be sure that the target thread is not running.
665
666	if( this->core->lid != target->core->lid )
667	{
668	// increment responses counter
669	hal_atomic_add( (void*)&ack_count , 1 );
670
671	// set FLAG_REQ_ACK and &ack_rsp_count in target descriptor
672	thread_set_req_ack( target , (uint32_t *)&ack_count );
673
674	// force scheduling on target thread
675	dev_pic_send_ipi( local_cxy , target->core->lid );
676	}
677	}
678	}
679	}
680
681	// release lock protecting process th_tbl[]
682	spinlock_unlock( &process->th_lock );
683
684	// wait acknowledges
685	while( 1 )
686	{
687	// exit when all scheduler acknoledges received
688	if ( ack_count == 0 ) break;
689
690	// wait 1000 cycles before retry
691	hal_fixed_delay( 1000 );
692	}
693
694	#if DEBUG_PROCESS_SIGACTION
695	cycle = (uint32_t)hal_get_cycles();
696	if( DEBUG_PROCESS_SIGACTION < cycle )
697	printk("\n[DBG] %s : thread %x exit for process %x in cluster %x / cycle %d\n",
698	__FUNCTION__ , this , process->pid , local_cxy , cycle );
699	#endif
700
701	} // end process_block_threads()
702
703	/////////////////////////////////////////////////
704	void process_delete_threads( process_t * process,
705	xptr_t client_xp )
706	{
707	thread_t * this; // pointer on calling thread
708	thread_t * target; // local pointer on target thread
709	xptr_t target_xp; // extended pointer on target thread
710	cxy_t owner_cxy; // owner process cluster
711	uint32_t ltid; // index in process th_tbl
712	uint32_t count; // threads counter
713
714	// get calling thread pointer
715	this = CURRENT_THREAD;
716
717	// get target process owner cluster
718	owner_cxy = CXY_FROM_PID( process->pid );
719
720	#if DEBUG_PROCESS_SIGACTION
721	uint32_t cycle = (uint32_t)hal_get_cycles();
722	if( DEBUG_PROCESS_SIGACTION < cycle )
723	printk("\n[DBG] %s : thread %x enter for process %x in cluster %x / cycle %d\n",
724	__FUNCTION__ , this , process->pid , local_cxy , cycle );
725	#endif
726
727	// get lock protecting process th_tbl[]
728	spinlock_lock( &process->th_lock );
729
730	// loop on target process local threads
731	// we use both "ltid" and "count" because it can exist "holes" in th_tbl
732	for( ltid = 0 , count = 0 ; count < process->th_nr ; ltid++ )
733	{
734	target = process->th_tbl[ltid];
735
736	if( target != NULL ) // valid thread
737	{
738	count++;
739	target_xp = XPTR( local_cxy , target );
740
741	// main thread and client thread should not be blocked
742	if( ((ltid != 0) \|\| (owner_cxy != local_cxy)) && // not main thread
743	(client_xp) != target_xp ) // not client thread
744	{
745	// mark target thread for delete and block it
746	thread_delete( target_xp , process->pid , false ); // not forced
747	}
748	}
749	}
750
751	// release lock protecting process th_tbl[]
752	spinlock_unlock( &process->th_lock );
753
754	#if DEBUG_PROCESS_SIGACTION
755	cycle = (uint32_t)hal_get_cycles();
756	if( DEBUG_PROCESS_SIGACTION < cycle )
757	printk("\n[DBG] %s : thread %x exit for process %x in cluster %x / cycle %d\n",
758	__FUNCTION__ , this , process->pid , local_cxy , cycle );
759	#endif
760
761	} // end process_delete_threads()
762
763	///////////////////////////////////////////////////
764	void process_unblock_threads( process_t * process )
765	{
766	thread_t * target; // pointer on target thead
767	thread_t * this; // pointer on calling thread
768	uint32_t ltid; // index in process th_tbl
769	uint32_t count; // requests counter
770
771	// get calling thread pointer
772	this = CURRENT_THREAD;
773
774	#if DEBUG_PROCESS_SIGACTION
775	uint32_t cycle = (uint32_t)hal_get_cycles();
776	if( DEBUG_PROCESS_SIGACTION < cycle )
777	printk("\n[DBG] %s : thread %x enter for process %x in cluster %x / cycle %d\n",
778	__FUNCTION__ , this , process->pid , local_cxy , cycle );
779	#endif
780
781	// get lock protecting process th_tbl[]
782	spinlock_lock( &process->th_lock );
783
784	// loop on process threads to unblock all threads
785	// we use both "ltid" and "count" because it can exist "holes" in th_tbl
786	for( ltid = 0 , count = 0 ; count < process->th_nr ; ltid++ )
787	{
788	target = process->th_tbl[ltid];
789
790	if( target != NULL ) // thread found
791	{
792	count++;
793
794	// reset the global blocked bit in target thread descriptor.
795	thread_unblock( XPTR( local_cxy , target ) , THREAD_BLOCKED_GLOBAL );
796	}
797	}
798
799	// release lock protecting process th_tbl[]
800	spinlock_unlock( &process->th_lock );
801
802	#if DEBUG_PROCESS_SIGACTION
803	cycle = (uint32_t)hal_get_cycles();
804	if( DEBUG_PROCESS_SIGACTION < cycle )
805	printk("\n[DBG] %s : thread %x exit for process %x in cluster %x / cycle %d\n",
806	__FUNCTION__ , this , process->pid , local_cxy , cycle );
807	#endif
808
809	} // end process_unblock_threads()
810
811	///////////////////////////////////////////////
812	process_t * process_get_local_copy( pid_t pid )
813	{
814	error_t error;
815	process_t * process_ptr; // local pointer on process
816	xptr_t process_xp; // extended pointer on process
817
818	cluster_t * cluster = LOCAL_CLUSTER;
819
820	// get lock protecting local list of processes
821	remote_spinlock_lock( XPTR( local_cxy , &cluster->pmgr.local_lock ) );
822
823	// scan the local list of process descriptors to find the process
824	xptr_t iter;
825	bool_t found = false;
826	XLIST_FOREACH( XPTR( local_cxy , &cluster->pmgr.local_root ) , iter )
827	{
828	process_xp = XLIST_ELEMENT( iter , process_t , local_list );
829	process_ptr = GET_PTR( process_xp );
830	if( process_ptr->pid == pid )
831	{
832	found = true;
833	break;
834	}
835	}
836
837	// release lock protecting local list of processes
838	remote_spinlock_unlock( XPTR( local_cxy , &cluster->pmgr.local_lock ) );
839
840	// allocate memory for a new local process descriptor
841	// and initialise it from reference cluster if not found
842	if( !found )
843	{
844	// get extended pointer on reference process descriptor
845	xptr_t ref_xp = cluster_get_reference_process_from_pid( pid );
846
847	assert( (ref_xp != XPTR_NULL) , "illegal pid\n" );
848
849	// allocate memory for local process descriptor
850	process_ptr = process_alloc();
851
852	if( process_ptr == NULL ) return NULL;
853
854	// initialize local process descriptor copy
855	error = process_copy_init( process_ptr , ref_xp );
856
857	if( error ) return NULL;
858	}
859
860	#if DEBUG_PROCESS_GET_LOCAL_COPY
861	uint32_t cycle = (uint32_t)hal_get_cycles();
862	if( DEBUG_PROCESS_GET_LOCAL_COPY < cycle )
863	printk("\n[DBG] %s : enter in cluster %x / pid %x / process %x / cycle %d\n",
864	__FUNCTION__ , local_cxy , pid , process_ptr , cycle );
865	#endif
866
867	return process_ptr;
868
869	} // end process_get_local_copy()
870
871	////////////////////////////////////////////
872	pid_t process_get_ppid( xptr_t process_xp )
873	{
874	cxy_t process_cxy;
875	process_t * process_ptr;
876	xptr_t parent_xp;
877	cxy_t parent_cxy;
878	process_t * parent_ptr;
879
880	// get process cluster and local pointer
881	process_cxy = GET_CXY( process_xp );
882	process_ptr = GET_PTR( process_xp );
883
884	// get pointers on parent process
885	parent_xp = (xptr_t)hal_remote_lwd( XPTR( process_cxy , &process_ptr->parent_xp ) );
886	parent_cxy = GET_CXY( parent_xp );
887	parent_ptr = GET_PTR( parent_xp );
888
889	return hal_remote_lw( XPTR( parent_cxy , &parent_ptr->pid ) );
890	}
891
892	//////////////////////////////////////////////////////////////////////////////////////////
893	// File descriptor array related functions
894	//////////////////////////////////////////////////////////////////////////////////////////
895
896	///////////////////////////////////////////
897	void process_fd_init( process_t * process )
898	{
899	uint32_t fd;
900
901	remote_spinlock_init( XPTR( local_cxy , &process->fd_array.lock ) );
902
903	process->fd_array.current = 0;
904
905	// initialize array
906	for ( fd = 0 ; fd < CONFIG_PROCESS_FILE_MAX_NR ; fd++ )
907	{
908	process->fd_array.array[fd] = XPTR_NULL;
909	}
910	}
911
912	//////////////////////////////
913	bool_t process_fd_array_full( void )
914	{
915	// get extended pointer on reference process
916	xptr_t ref_xp = CURRENT_THREAD->process->ref_xp;
917
918	// get reference process cluster and local pointer
919	process_t * ref_ptr = GET_PTR( ref_xp );
920	cxy_t ref_cxy = GET_CXY( ref_xp );
921
922	// get number of open file descriptors from reference fd_array
923	uint32_t current = hal_remote_lw( XPTR( ref_cxy , &ref_ptr->fd_array.current ) );
924
925	return ( current >= CONFIG_PROCESS_FILE_MAX_NR );
926	}
927
928	/////////////////////////////////////////////////
929	error_t process_fd_register( process_t * process,
930	xptr_t file_xp,
931	uint32_t * fdid )
932	{
933	bool_t found;
934	uint32_t id;
935	xptr_t xp;
936
937	// get reference process cluster and local pointer
938	xptr_t ref_xp = process->ref_xp;
939	process_t * ref_ptr = GET_PTR( ref_xp );
940	cxy_t ref_cxy = GET_CXY( ref_xp );
941
942	// take lock protecting reference fd_array
943	remote_spinlock_lock( XPTR( ref_cxy , &ref_ptr->fd_array.lock ) );
944
945	found = false;
946
947	for ( id = 0; id < CONFIG_PROCESS_FILE_MAX_NR ; id++ )
948	{
949	xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->fd_array.array[id] ) );
950	if ( xp == XPTR_NULL )
951	{
952	found = true;
953	hal_remote_swd( XPTR( ref_cxy , &ref_ptr->fd_array.array[id] ) , file_xp );
954	hal_remote_atomic_add( XPTR( ref_cxy , &ref_ptr->fd_array.current ) , 1 );
955	*fdid = id;
956	break;
957	}
958	}
959
960	// release lock protecting reference fd_array
961	remote_spinlock_unlock( XPTR( ref_cxy , &ref_ptr->fd_array.lock ) );
962
963	if ( !found ) return -1;
964	else return 0;
965	}
966
967	////////////////////////////////////////////////
968	xptr_t process_fd_get_xptr( process_t * process,
969	uint32_t fdid )
970	{
971	xptr_t file_xp;
972
973	// access local copy of process descriptor
974	file_xp = process->fd_array.array[fdid];
975
976	if( file_xp == XPTR_NULL )
977	{
978	// get reference process cluster and local pointer
979	xptr_t ref_xp = process->ref_xp;
980	cxy_t ref_cxy = GET_CXY( ref_xp );
981	process_t * ref_ptr = GET_PTR( ref_xp );
982
983	// access reference process descriptor
984	file_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->fd_array.array[fdid] ) );
985
986	// update local fd_array if found
987	if( file_xp != XPTR_NULL )
988	{
989	process->fd_array.array[fdid] = file_xp;
990	}
991	}
992
993	return file_xp;
994
995	} // end process_fd_get_xptr()
996
997	///////////////////////////////////////////
998	void process_fd_remote_copy( xptr_t dst_xp,
999	xptr_t src_xp )
1000	{
1001	uint32_t fd;
1002	xptr_t entry;
1003
1004	// get cluster and local pointer for src fd_array
1005	cxy_t src_cxy = GET_CXY( src_xp );
1006	fd_array_t * src_ptr = GET_PTR( src_xp );
1007
1008	// get cluster and local pointer for dst fd_array
1009	cxy_t dst_cxy = GET_CXY( dst_xp );
1010	fd_array_t * dst_ptr = GET_PTR( dst_xp );
1011
1012	// get the remote lock protecting the src fd_array
1013	remote_spinlock_lock( XPTR( src_cxy , &src_ptr->lock ) );
1014
1015	// loop on all fd_array entries
1016	for( fd = 0 ; fd < CONFIG_PROCESS_FILE_MAX_NR ; fd++ )
1017	{
1018	entry = (xptr_t)hal_remote_lwd( XPTR( src_cxy , &src_ptr->array[fd] ) );
1019
1020	if( entry != XPTR_NULL )
1021	{
1022	// increment file descriptor refcount
1023	vfs_file_count_up( entry );
1024
1025	// copy entry in destination process fd_array
1026	hal_remote_swd( XPTR( dst_cxy , &dst_ptr->array[fd] ) , entry );
1027	}
1028	}
1029
1030	// release lock on source process fd_array
1031	remote_spinlock_unlock( XPTR( src_cxy , &src_ptr->lock ) );
1032
1033	} // end process_fd_remote_copy()
1034
1035	////////////////////////////////////////////////////////////////////////////////////
1036	// Thread related functions
1037	////////////////////////////////////////////////////////////////////////////////////
1038
1039	/////////////////////////////////////////////////////
1040	error_t process_register_thread( process_t * process,
1041	thread_t * thread,
1042	trdid_t * trdid )
1043	{
1044	ltid_t ltid;
1045	reg_t save_sr;
1046	bool_t found = false;
1047
1048
1049	assert( (process != NULL) , "process argument is NULL" );
1050
1051	assert( (thread != NULL) , "thread argument is NULL" );
1052
1053	// take lock protecting th_tbl, depending on thread type:
1054	// we don't want to use a descheduling policy for idle thread initialisation
1055	if ( thread->type == THREAD_IDLE ) {
1056	spinlock_lock_busy( &process->th_lock , &save_sr );
1057	} else {
1058	spinlock_lock( &process->th_lock );
1059	}
1060
1061	// search a free slot in th_tbl[]
1062	for( ltid = 0 ; ltid < CONFIG_THREAD_MAX_PER_CLUSTER ; ltid++ )
1063	{
1064	if( process->th_tbl[ltid] == NULL )
1065	{
1066	found = true;
1067	break;
1068	}
1069	}
1070
1071	if( found )
1072	{
1073	// register thread in th_tbl[]
1074	process->th_tbl[ltid] = thread;
1075	process->th_nr++;
1076
1077	// returns trdid
1078	*trdid = TRDID( local_cxy , ltid );
1079	}
1080
1081	// release lock protecting th_tbl
1082	hal_fence();
1083	if( thread->type == THREAD_IDLE ) {
1084	spinlock_unlock_busy( &process->th_lock , save_sr );
1085	} else {
1086	spinlock_unlock( &process->th_lock );
1087	}
1088
1089	return (found) ? 0 : ENOMEM;
1090
1091	} // end process_register_thread()
1092
1093	/////////////////////////////////////////////////
1094	bool_t process_remove_thread( thread_t * thread )
1095	{
1096	uint32_t count; // number of threads in local process descriptor
1097
1098	assert( (thread != NULL) , "thread argument is NULL" );
1099
1100	process_t * process = thread->process;
1101
1102	// get thread local index
1103	ltid_t ltid = LTID_FROM_TRDID( thread->trdid );
1104
1105	// take lock protecting th_tbl
1106	spinlock_lock( &process->th_lock );
1107
1108	count = process->th_nr;
1109
1110	assert( (count > 0) , "process th_nr cannot be 0\n" );
1111
1112	// remove thread from th_tbl[]
1113	process->th_tbl[ltid] = NULL;
1114	process->th_nr = count-1;
1115
1116	// release lock protecting th_tbl
1117	hal_fence();
1118	spinlock_unlock( &process->th_lock );
1119
1120	return (count == 1);
1121
1122	} // end process_remove_thread()
1123
1124	/////////////////////////////////////////////////////////
1125	error_t process_make_fork( xptr_t parent_process_xp,
1126	xptr_t parent_thread_xp,
1127	pid_t * child_pid,
1128	thread_t ** child_thread )
1129	{
1130	process_t * process; // local pointer on child process descriptor
1131	thread_t * thread; // local pointer on child thread descriptor
1132	pid_t new_pid; // process identifier for child process
1133	pid_t parent_pid; // process identifier for parent process
1134	xptr_t ref_xp; // extended pointer on reference process
1135	xptr_t vfs_bin_xp; // extended pointer on .elf file
1136	error_t error;
1137
1138	// get cluster and local pointer for parent process
1139	cxy_t parent_process_cxy = GET_CXY( parent_process_xp );
1140	process_t * parent_process_ptr = GET_PTR( parent_process_xp );
1141
1142	// get parent process PID and extended pointer on .elf file
1143	parent_pid = hal_remote_lw (XPTR( parent_process_cxy , &parent_process_ptr->pid));
1144	vfs_bin_xp = hal_remote_lwd(XPTR( parent_process_cxy , &parent_process_ptr->vfs_bin_xp));
1145
1146	// check parent process is the reference process
1147	ref_xp = hal_remote_lwd( XPTR( parent_process_cxy , &parent_process_ptr->ref_xp ) );
1148
1149	assert( (parent_process_xp == ref_xp ) ,
1150	"parent process must be the reference process\n" );
1151
1152	#if DEBUG_PROCESS_MAKE_FORK
1153	uint32_t cycle = (uint32_t)hal_get_cycles();
1154	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1155	printk("\n[DBG] %s : thread %x in process %x enter / cluster %x / cycle %d\n",
1156	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, local_cxy, cycle );
1157	#endif
1158
1159	// allocate a process descriptor
1160	process = process_alloc();
1161	if( process == NULL )
1162	{
1163	printk("\n[ERROR] in %s : cannot get process in cluster %x\n",
1164	__FUNCTION__, local_cxy );
1165	return -1;
1166	}
1167
1168	// allocate a child PID from local cluster
1169	error = cluster_pid_alloc( process , &new_pid );
1170	if( error )
1171	{
1172	printk("\n[ERROR] in %s : cannot get PID in cluster %x\n",
1173	__FUNCTION__, local_cxy );
1174	process_free( process );
1175	return -1;
1176	}
1177
1178	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1179	cycle = (uint32_t)hal_get_cycles();
1180	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1181	printk("\n[DBG] %s : thread %x in process %x allocated process %x / cycle %d\n",
1182	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, new_pid, cycle );
1183	#endif
1184
1185	// initializes child process descriptor from parent process descriptor
1186	process_reference_init( process,
1187	new_pid,
1188	parent_process_xp );
1189
1190	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1191	cycle = (uint32_t)hal_get_cycles();
1192	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1193	printk("\n[DBG] %s : thread %x in process %x initialized child_process %x / cycle %d\n",
1194	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, new_pid, cycle );
1195	#endif
1196
1197	// give TXT ownership to child process
1198	process_txt_set_ownership( XPTR( local_cxy , process ) );
1199
1200	// copy VMM from parent descriptor to child descriptor
1201	error = vmm_fork_copy( process,
1202	parent_process_xp );
1203	if( error )
1204	{
1205	printk("\n[ERROR] in %s : cannot copy VMM in cluster %x\n",
1206	__FUNCTION__, local_cxy );
1207	process_free( process );
1208	cluster_pid_release( new_pid );
1209	return -1;
1210	}
1211
1212	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1213	cycle = (uint32_t)hal_get_cycles();
1214	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1215	printk("\n[DBG] %s : thread %x in process %x copied VMM from parent %x to child %x / cycle %d\n",
1216	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
1217	parent_pid, new_pid, cycle );
1218	#endif
1219
1220	// parent process gives TXT ownership to child process if required
1221	if( process_txt_is_owner(parent_process_xp) )
1222	{
1223	process_txt_set_ownership( XPTR( local_cxy , process ) );
1224
1225	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1226	cycle = (uint32_t)hal_get_cycles();
1227	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1228	printk("\n[DBG] %s : thread %x in process %x gives TXT from parent %x to child %x / cycle %d\n",
1229	__FUNCTION__ , CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
1230	parent_pid, new_pid, cycle );
1231	#endif
1232
1233	}
1234
1235	// update extended pointer on .elf file
1236	process->vfs_bin_xp = vfs_bin_xp;
1237
1238	// create child thread descriptor from parent thread descriptor
1239	error = thread_user_fork( parent_thread_xp,
1240	process,
1241	&thread );
1242	if( error )
1243	{
1244	printk("\n[ERROR] in %s : cannot create thread in cluster %x\n",
1245	__FUNCTION__, local_cxy );
1246	process_free( process );
1247	cluster_pid_release( new_pid );
1248	return -1;
1249	}
1250
1251	// check main thread LTID
1252	assert( (LTID_FROM_TRDID(thread->trdid) == 0) ,
1253	"main thread must have LTID == 0\n" );
1254
1255	//#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1256	#if DEBUG_PROCESS_MAKE_FORK
1257	cycle = (uint32_t)hal_get_cycles();
1258	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1259	printk("\n[DBG] %s : thread %x in process %x created main thread %x / cycle %d\n",
1260	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, thread, cycle );
1261	#endif
1262
1263	// set Copy_On_Write flag in parent process GPT
1264	// this includes all replicated GPT copies
1265	if( parent_process_cxy == local_cxy ) // reference is local
1266	{
1267	vmm_set_cow( parent_process_ptr );
1268	}
1269	else // reference is remote
1270	{
1271	rpc_vmm_set_cow_client( parent_process_cxy,
1272	parent_process_ptr );
1273	}
1274
1275	// set Copy_On_Write flag in child process GPT
1276	vmm_set_cow( process );
1277
1278	#if( DEBUG_PROCESS_MAKE_FORK & 1 )
1279	cycle = (uint32_t)hal_get_cycles();
1280	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1281	printk("\n[DBG] %s : thread %x in process %x set COW in parent and child / cycle %d\n",
1282	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, cycle );
1283	#endif
1284
1285	// get extended pointers on parent children_root, children_lock and children_nr
1286	xptr_t children_root_xp = XPTR( parent_process_cxy , &parent_process_ptr->children_root );
1287	xptr_t children_lock_xp = XPTR( parent_process_cxy , &parent_process_ptr->children_lock );
1288	xptr_t children_nr_xp = XPTR( parent_process_cxy , &parent_process_ptr->children_nr );
1289
1290	// register process in parent children list
1291	remote_spinlock_lock( children_lock_xp );
1292	xlist_add_last( children_root_xp , XPTR( local_cxy , &process->children_list ) );
1293	hal_remote_atomic_add( children_nr_xp , 1 );
1294	remote_spinlock_unlock( children_lock_xp );
1295
1296	// return success
1297	*child_thread = thread;
1298	*child_pid = new_pid;
1299
1300	#if DEBUG_PROCESS_MAKE_FORK
1301	cycle = (uint32_t)hal_get_cycles();
1302	if( DEBUG_PROCESS_MAKE_FORK < cycle )
1303	printk("\n[DBG] %s : thread %x in process %x exit / created process %x / cycle %d\n",
1304	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, new_pid, cycle );
1305	#endif
1306
1307	return 0;
1308
1309	} // end process_make_fork()
1310
1311	/////////////////////////////////////////////////////
1312	error_t process_make_exec( exec_info_t * exec_info )
1313	{
1314	thread_t * thread; // local pointer on this thread
1315	process_t * process; // local pointer on this process
1316	pid_t pid; // this process identifier
1317	error_t error; // value returned by called functions
1318	char * path; // path to .elf file
1319	xptr_t file_xp; // extended pointer on .elf file descriptor
1320	uint32_t file_id; // file index in fd_array
1321	uint32_t args_nr; // number of main thread arguments
1322	char ** args_pointers; // array of pointers on main thread arguments
1323
1324	// get thread, process & PID
1325	thread = CURRENT_THREAD;
1326	process = thread->process;
1327	pid = process->pid;
1328
1329	// get relevant infos from exec_info
1330	path = exec_info->path;
1331	args_nr = exec_info->args_nr;
1332	args_pointers = exec_info->args_pointers;
1333
1334	#if DEBUG_PROCESS_MAKE_EXEC
1335	uint32_t cycle = (uint32_t)hal_get_cycles();
1336	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1337	printk("\n[DBG] %s : thread %x in process %x enters / path %s / cycle %d\n",
1338	__FUNCTION__, thread->trdid, pid, path, cycle );
1339	#endif
1340
1341	// open the file identified by <path>
1342	file_xp = XPTR_NULL;
1343	file_id = -1;
1344	error = vfs_open( process,
1345	path,
1346	O_RDONLY,
1347	0,
1348	&file_xp,
1349	&file_id );
1350	if( error )
1351	{
1352	printk("\n[ERROR] in %s : failed to open file <%s>\n", __FUNCTION__ , path );
1353	return -1;
1354	}
1355
1356	#if (DEBUG_PROCESS_MAKE_EXEC & 1)
1357	cycle = (uint32_t)hal_get_cycles();
1358	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1359	printk("\n[DBG] %s : thread %x in process %x opened file <%s> / cycle %d\n",
1360	__FUNCTION__, thread->trdid, pid, path, cycle );
1361	#endif
1362
1363	// delete all threads other than this main thread in all clusters
1364	process_sigaction( pid , DELETE_ALL_THREADS );
1365
1366	#if (DEBUG_PROCESS_MAKE_EXEC & 1)
1367	cycle = (uint32_t)hal_get_cycles();
1368	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1369	printk("\n[DBG] %s : thread %x in process %x deleted all threads / cycle %d\n",
1370	__FUNCTION__, thread->trdid, pid, cycle );
1371	#endif
1372
1373	// reset local process VMM
1374	vmm_destroy( process );
1375
1376	#if( DEBUG_PROCESS_MAKE_EXEC & 1 )
1377	cycle = (uint32_t)hal_get_cycles();
1378	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1379	printk("\n[DBG] %s : thread %x in process %x reset VMM / cycle %d\n",
1380	__FUNCTION__, thread->trdid, pid, cycle );
1381	#endif
1382
1383	// re-initialize the VMM (kentry/args/envs vsegs registration)
1384	error = vmm_init( process );
1385	if( error )
1386	{
1387	printk("\n[ERROR] in %s : cannot initialise VMM for %s\n", __FUNCTION__ , path );
1388	vfs_close( file_xp , file_id );
1389	// FIXME restore old process VMM
1390	return -1;
1391	}
1392
1393	#if( DEBUG_PROCESS_MAKE_EXEC & 1 )
1394	cycle = (uint32_t)hal_get_cycles();
1395	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1396	printk("\n[DBG] %s : thread %x in process %x / kentry/args/envs vsegs registered / cycle %d\n",
1397	__FUNCTION__, thread->trdid, pid, cycle );
1398	#endif
1399
1400	// register code & data vsegs as well as entry-point in process VMM,
1401	// and register extended pointer on .elf file in process descriptor
1402	error = elf_load_process( file_xp , process );
1403	if( error )
1404	{
1405	printk("\n[ERROR] in %s : failed to access <%s>\n", __FUNCTION__ , path );
1406	vfs_close( file_xp , file_id );
1407	// FIXME restore old process VMM
1408	return -1;
1409	}
1410
1411	#if( DEBUG_PROCESS_MAKE_EXEC & 1 )
1412	cycle = (uint32_t)hal_get_cycles();
1413	if( DEBUG_PROCESS_MAKE_EXEC < cycle )
1414	printk("\n[DBG] %s : thread %x in process %x / code/data vsegs registered / cycle %d\n",
1415	__FUNCTION__, thread->trdid, pid, cycle );
1416	#endif
1417
1418	// update the existing main thread descriptor... and jump to user code
1419	error = thread_user_exec( (void *)process->vmm.entry_point,
1420	args_nr,
1421	args_pointers );
1422	if( error )
1423	{
1424	printk("\n[ERROR] in %s : cannot update main thread for %s\n", __FUNCTION__ , path );
1425	vfs_close( file_xp , file_id );
1426	// FIXME restore old process VMM
1427	return -1;
1428	}
1429
1430	assert( false, "we should not execute this code");
1431
1432	return 0;
1433
1434	} // end process_make_exec()
1435
1436
1437	///////////////////////////////////////////////
1438	void process_zero_create( process_t * process )
1439	{
1440
1441	#if DEBUG_PROCESS_ZERO_CREATE
1442	uint32_t cycle = (uint32_t)hal_get_cycles();
1443	if( DEBUG_PROCESS_ZERO_CREATE < cycle )
1444	printk("\n[DBG] %s : thread %x enter / cycle %d\n", __FUNCTION__, CURRENT_THREAD, cycle );
1445	#endif
1446
1447	// initialize PID, REF_XP, PARENT_XP, and STATE
1448	process->pid = 0;
1449	process->ref_xp = XPTR( local_cxy , process );
1450	process->owner_xp = XPTR( local_cxy , process );
1451	process->parent_xp = XPTR_NULL;
1452	process->term_state = 0;
1453
1454	// reset th_tbl[] array as empty
1455	uint32_t i;
1456	for( i = 0 ; i < CONFIG_THREAD_MAX_PER_CLUSTER ; i++ )
1457	{
1458	process->th_tbl[i] = NULL;
1459	}
1460	process->th_nr = 0;
1461	spinlock_init( &process->th_lock );
1462
1463	// reset children list as empty
1464	xlist_root_init( XPTR( local_cxy , &process->children_root ) );
1465	remote_spinlock_init( XPTR( local_cxy , &process->children_lock ) );
1466	process->children_nr = 0;
1467
1468	hal_fence();
1469
1470	#if DEBUG_PROCESS_ZERO_CREATE
1471	cycle = (uint32_t)hal_get_cycles();
1472	if( DEBUG_PROCESS_ZERO_CREATE < cycle )
1473	printk("\n[DBG] %s : thread %x exit / cycle %d\n", __FUNCTION__, CURRENT_THREAD, cycle );
1474	#endif
1475
1476	} // end process_zero_init()
1477
1478	//////////////////////////
1479	void process_init_create( void )
1480	{
1481	process_t * process; // local pointer on process descriptor
1482	pid_t pid; // process_init identifier
1483	thread_t * thread; // local pointer on main thread
1484	pthread_attr_t attr; // main thread attributes
1485	lid_t lid; // selected core local index for main thread
1486	xptr_t file_xp; // extended pointer on .elf file descriptor
1487	uint32_t file_id; // file index in fd_array
1488	error_t error;
1489
1490	#if DEBUG_PROCESS_INIT_CREATE
1491	uint32_t cycle = (uint32_t)hal_get_cycles();
1492	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1493	printk("\n[DBG] %s : thread %x in process %x enter / cycle %d\n",
1494	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, cycle );
1495	#endif
1496
1497	// allocates memory for process descriptor from local cluster
1498	process = process_alloc();
1499
1500	assert( (process != NULL),
1501	"no memory for process descriptor in cluster %x\n", local_cxy );
1502
1503	// get PID from local cluster
1504	error = cluster_pid_alloc( process , &pid );
1505
1506	assert( (error == 0),
1507	"cannot allocate PID in cluster %x\n", local_cxy );
1508
1509	assert( (pid == 1) ,
1510	"process INIT must be first process in cluster 0\n" );
1511
1512	// initialize process descriptor / parent is local process_zero
1513	process_reference_init( process,
1514	pid,
1515	XPTR( local_cxy , &process_zero ) );
1516
1517	// open the file identified by CONFIG_PROCESS_INIT_PATH
1518	file_xp = XPTR_NULL;
1519	file_id = -1;
1520	error = vfs_open( process,
1521	CONFIG_PROCESS_INIT_PATH,
1522	O_RDONLY,
1523	0,
1524	&file_xp,
1525	&file_id );
1526
1527	assert( (error == 0),
1528	"failed to open file <%s>\n", CONFIG_PROCESS_INIT_PATH );
1529
1530	// register "code" and "data" vsegs as well as entry-point
1531	// in process VMM, using information contained in the elf file.
1532	error = elf_load_process( file_xp , process );
1533
1534	assert( (error == 0),
1535	"cannot access .elf file <%s>\n", CONFIG_PROCESS_INIT_PATH );
1536
1537	// get extended pointers on process_zero children_root, children_lock
1538	xptr_t children_root_xp = XPTR( local_cxy , &process_zero.children_root );
1539	xptr_t children_lock_xp = XPTR( local_cxy , &process_zero.children_lock );
1540
1541	// register process INIT in parent local process_zero
1542	remote_spinlock_lock( children_lock_xp );
1543	xlist_add_last( children_root_xp , XPTR( local_cxy , &process->children_list ) );
1544	hal_atomic_add( &process_zero.children_nr , 1 );
1545	remote_spinlock_unlock( children_lock_xp );
1546
1547	// select a core in local cluster to execute the main thread
1548	lid = cluster_select_local_core();
1549
1550	// initialize pthread attributes for main thread
1551	attr.attributes = PT_ATTR_DETACH \| PT_ATTR_CLUSTER_DEFINED \| PT_ATTR_CORE_DEFINED;
1552	attr.cxy = local_cxy;
1553	attr.lid = lid;
1554
1555	// create and initialize thread descriptor
1556	error = thread_user_create( pid,
1557	(void *)process->vmm.entry_point,
1558	NULL,
1559	&attr,
1560	&thread );
1561
1562	assert( (error == 0),
1563	"cannot create main thread for <%s>\n", CONFIG_PROCESS_INIT_PATH );
1564
1565	assert( (thread->trdid == 0),
1566	"main thread must have index 0 for <%s>\n", CONFIG_PROCESS_INIT_PATH );
1567
1568	// activate thread
1569	thread_unblock( XPTR( local_cxy , thread ) , THREAD_BLOCKED_GLOBAL );
1570
1571	hal_fence();
1572
1573	#if DEBUG_PROCESS_INIT_CREATE
1574	cycle = (uint32_t)hal_get_cycles();
1575	if( DEBUG_PROCESS_INIT_CREATE < cycle )
1576	printk("\n[DBG] %s : thread %x in process %x exit / cycle %d\n",
1577	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, cycle );
1578	#endif
1579
1580	} // end process_init_create()
1581
1582	/////////////////////////////////////////
1583	void process_display( xptr_t process_xp )
1584	{
1585	process_t * process_ptr;
1586	cxy_t process_cxy;
1587
1588	xptr_t parent_xp; // extended pointer on parent process
1589	process_t * parent_ptr;
1590	cxy_t parent_cxy;
1591
1592	xptr_t owner_xp; // extended pointer on owner process
1593	process_t * owner_ptr;
1594	cxy_t owner_cxy;
1595
1596	pid_t pid;
1597	pid_t ppid;
1598	uint32_t state;
1599	uint32_t th_nr;
1600
1601	xptr_t txt_file_xp; // extended pointer on TXT_RX file descriptor
1602	xptr_t txt_chdev_xp; // extended pointer on TXT_RX chdev
1603	chdev_t * txt_chdev_ptr;
1604	cxy_t txt_chdev_cxy;
1605	xptr_t txt_owner_xp; // extended pointer on TXT owner process
1606
1607	xptr_t elf_file_xp; // extended pointer on .elf file
1608	cxy_t elf_file_cxy;
1609	vfs_file_t * elf_file_ptr;
1610	vfs_inode_t * elf_inode_ptr; // local pointer on .elf inode
1611
1612	char txt_name[CONFIG_VFS_MAX_NAME_LENGTH];
1613	char elf_name[CONFIG_VFS_MAX_NAME_LENGTH];
1614
1615	// get cluster and local pointer on process
1616	process_ptr = GET_PTR( process_xp );
1617	process_cxy = GET_CXY( process_xp );
1618
1619	// get PID and state
1620	pid = hal_remote_lw( XPTR( process_cxy , &process_ptr->pid ) );
1621	state = hal_remote_lw( XPTR( process_cxy , &process_ptr->term_state ) );
1622
1623	// get PPID
1624	parent_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->parent_xp ) );
1625	parent_cxy = GET_CXY( parent_xp );
1626	parent_ptr = GET_PTR( parent_xp );
1627	ppid = hal_remote_lw( XPTR( parent_cxy , &parent_ptr->pid ) );
1628
1629	// get number of threads
1630	th_nr = hal_remote_lw( XPTR( process_cxy , &process_ptr->th_nr ) );
1631
1632	// get pointers on owner process descriptor
1633	owner_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->owner_xp ) );
1634	owner_cxy = GET_CXY( owner_xp );
1635	owner_ptr = GET_PTR( owner_xp );
1636
1637	// get extended pointer on TXT_RX file descriptor attached to process
1638	txt_file_xp = hal_remote_lwd( XPTR( owner_cxy , &owner_ptr->fd_array.array[0] ) );
1639
1640	assert( (txt_file_xp != XPTR_NULL) ,
1641	"process must be attached to one TXT terminal\n" );
1642
1643	// get TXT_RX chdev pointers
1644	txt_chdev_xp = chdev_from_file( txt_file_xp );
1645	txt_chdev_cxy = GET_CXY( txt_chdev_xp );
1646	txt_chdev_ptr = GET_PTR( txt_chdev_xp );
1647
1648	// get TXT_RX name and ownership
1649	hal_remote_strcpy( XPTR( local_cxy , txt_name ) ,
1650	XPTR( txt_chdev_cxy , txt_chdev_ptr->name ) );
1651
1652	txt_owner_xp = (xptr_t)hal_remote_lwd( XPTR( txt_chdev_cxy,
1653	&txt_chdev_ptr->ext.txt.owner_xp ) );
1654
1655	// get process .elf name
1656	elf_file_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->vfs_bin_xp ) );
1657	elf_file_cxy = GET_CXY( elf_file_xp );
1658	elf_file_ptr = (vfs_file_t *)GET_PTR( elf_file_xp );
1659	elf_inode_ptr = (vfs_inode_t *)hal_remote_lpt( XPTR( elf_file_cxy , &elf_file_ptr->inode ) );
1660	vfs_inode_get_name( XPTR( elf_file_cxy , elf_inode_ptr ) , elf_name );
1661
1662	// display process info
1663	if( txt_owner_xp == process_xp )
1664	{
1665	nolock_printk("PID %X \| PPID %X \| TS %X \| %s (FG) \| %X \| %d \| %s\n",
1666	pid, ppid, state, txt_name, process_ptr, th_nr, elf_name );
1667	}
1668	else
1669	{
1670	nolock_printk("PID %X \| PPID %X \| TS %X \| %s (BG) \| %X \| %d \| %s\n",
1671	pid, ppid, state, txt_name, process_ptr, th_nr, elf_name );
1672	}
1673	} // end process_display()
1674
1675
1676	////////////////////////////////////////////////////////////////////////////////////////
1677	// Terminals related functions
1678	////////////////////////////////////////////////////////////////////////////////////////
1679
1680	////////////////////////////
1681	uint32_t process_txt_alloc( void )
1682	{
1683	uint32_t index; // TXT terminal index
1684	xptr_t chdev_xp; // extended pointer on TXT_RX chdev
1685	chdev_t * chdev_ptr; // local pointer on TXT_RX chdev
1686	cxy_t chdev_cxy; // TXT_RX chdev cluster
1687	xptr_t root_xp; // extended pointer on owner field in chdev
1688
1689	// scan the user TXT_RX chdevs (TXT0 is reserved for kernel)
1690	for( index = 1 ; index < LOCAL_CLUSTER->nb_txt_channels ; index ++ )
1691	{
1692	// get pointers on TXT_RX[index]
1693	chdev_xp = chdev_dir.txt_rx[index];
1694	chdev_cxy = GET_CXY( chdev_xp );
1695	chdev_ptr = GET_PTR( chdev_xp );
1696
1697	// get extended pointer on root of attached process
1698	root_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.root );
1699
1700	// return free TXT index if found
1701	if( xlist_is_empty( root_xp ) ) return index;
1702	}
1703
1704	assert( false , "no free TXT terminal found" );
1705
1706	return -1;
1707
1708	} // end process_txt_alloc()
1709
1710	/////////////////////////////////////////////
1711	void process_txt_attach( process_t * process,
1712	uint32_t txt_id )
1713	{
1714	xptr_t chdev_xp; // extended pointer on TXT_RX chdev
1715	cxy_t chdev_cxy; // TXT_RX chdev cluster
1716	chdev_t * chdev_ptr; // local pointer on TXT_RX chdev
1717	xptr_t root_xp; // extended pointer on list root in chdev
1718	xptr_t lock_xp; // extended pointer on list lock in chdev
1719
1720	// check process is in owner cluster
1721	assert( (CXY_FROM_PID( process->pid ) == local_cxy) ,
1722	"process descriptor not in owner cluster" );
1723
1724	// check terminal index
1725	assert( (txt_id < LOCAL_CLUSTER->nb_txt_channels) ,
1726	"illegal TXT terminal index" );
1727
1728	// get pointers on TXT_RX[txt_id] chdev
1729	chdev_xp = chdev_dir.txt_rx[txt_id];
1730	chdev_cxy = GET_CXY( chdev_xp );
1731	chdev_ptr = GET_PTR( chdev_xp );
1732
1733	// get extended pointer on root & lock of attached process list
1734	root_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.root );
1735	lock_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.lock );
1736
1737	// insert process in attached process list
1738	remote_spinlock_lock( lock_xp );
1739	xlist_add_last( root_xp , XPTR( local_cxy , &process->txt_list ) );
1740	remote_spinlock_unlock( lock_xp );
1741
1742	#if DEBUG_PROCESS_TXT
1743	uint32_t cycle = (uint32_t)hal_get_cycles();
1744	if( DEBUG_PROCESS_TXT < cycle )
1745	printk("\n[DBG] %s : thread %x in process %x attached process %x to TXT %d / cycle %d\n",
1746	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
1747	process->pid, txt_id , cycle );
1748	#endif
1749
1750	} // end process_txt_attach()
1751
1752	/////////////////////////////////////////////
1753	void process_txt_detach( xptr_t process_xp )
1754	{
1755	process_t * process_ptr; // local pointer on process in owner cluster
1756	cxy_t process_cxy; // process owner cluster
1757	pid_t process_pid; // process identifier
1758	xptr_t file_xp; // extended pointer on stdin file
1759	xptr_t chdev_xp; // extended pointer on TXT_RX chdev
1760	cxy_t chdev_cxy; // TXT_RX chdev cluster
1761	chdev_t * chdev_ptr; // local pointer on TXT_RX chdev
1762	xptr_t lock_xp; // extended pointer on list lock in chdev
1763
1764	// get process cluster, local pointer, and PID
1765	process_cxy = GET_CXY( process_xp );
1766	process_ptr = GET_PTR( process_xp );
1767
1768	// check process descriptor in owner cluster
1769	process_pid = hal_remote_lw( XPTR( process_cxy , &process_ptr->pid ) );
1770	assert( (CXY_FROM_PID( process_pid ) == process_cxy ) ,
1771	"process descriptor not in owner cluster" );
1772
1773	// release TXT ownership (does nothing if not TXT owner)
1774	process_txt_transfer_ownership( process_xp );
1775
1776	// get extended pointer on process stdin file
1777	file_xp = (xptr_t)hal_remote_lwd( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
1778
1779	// get pointers on TXT_RX chdev
1780	chdev_xp = chdev_from_file( file_xp );
1781	chdev_cxy = GET_CXY( chdev_xp );
1782	chdev_ptr = (chdev_t *)GET_PTR( chdev_xp );
1783
1784	// get extended pointer on lock protecting attached process list
1785	lock_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.lock );
1786
1787	// unlink process from attached process list
1788	remote_spinlock_lock( lock_xp );
1789	xlist_unlink( XPTR( process_cxy , &process_ptr->txt_list ) );
1790	remote_spinlock_unlock( lock_xp );
1791
1792	#if DEBUG_PROCESS_TXT
1793	uint32_t cycle = (uint32_t)hal_get_cycles();
1794	uint32_t txt_id = hal_remote_lw( XPTR( chdev_cxy , &chdev_ptr->channel ) );
1795	if( DEBUG_PROCESS_TXT < cycle )
1796	printk("\n[DBG] %s : thread %x in process %x detached process %x from TXT %d / cycle %d\n",
1797	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
1798	process_pid, txt_id, cycle );
1799	#endif
1800
1801	} // end process_txt_detach()
1802
1803	///////////////////////////////////////////////////
1804	void process_txt_set_ownership( xptr_t process_xp )
1805	{
1806	process_t * process_ptr;
1807	cxy_t process_cxy;
1808	pid_t process_pid;
1809	xptr_t file_xp;
1810	xptr_t txt_xp;
1811	chdev_t * txt_ptr;
1812	cxy_t txt_cxy;
1813
1814	// get pointers on process in owner cluster
1815	process_cxy = GET_CXY( process_xp );
1816	process_ptr = GET_PTR( process_xp );
1817	process_pid = hal_remote_lw( XPTR( process_cxy , &process_ptr->pid ) );
1818
1819	// check owner cluster
1820	assert( (process_cxy == CXY_FROM_PID( process_pid )) ,
1821	"process descriptor not in owner cluster\n" );
1822
1823	// get extended pointer on stdin pseudo file
1824	file_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
1825
1826	// get pointers on TXT chdev
1827	txt_xp = chdev_from_file( file_xp );
1828	txt_cxy = GET_CXY( txt_xp );
1829	txt_ptr = GET_PTR( txt_xp );
1830
1831	// set owner field in TXT chdev
1832	hal_remote_swd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , process_xp );
1833
1834	#if DEBUG_PROCESS_TXT
1835	uint32_t cycle = (uint32_t)hal_get_cycles();
1836	uint32_t txt_id = hal_remote_lw( XPTR( txt_cxy , &txt_ptr->channel ) );
1837	if( DEBUG_PROCESS_TXT < cycle )
1838	printk("\n[DBG] %s : thread %x in process %x give TXT %d to process %x / cycle %d\n",
1839	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, txt_id, process_pid, cycle );
1840	#endif
1841
1842	} // end process_txt_set ownership()
1843
1844	////////////////////////////////////////////////////////
1845	void process_txt_transfer_ownership( xptr_t process_xp )
1846	{
1847	process_t * process_ptr; // local pointer on process releasing ownership
1848	cxy_t process_cxy; // process cluster
1849	pid_t process_pid; // process identifier
1850	xptr_t file_xp; // extended pointer on TXT_RX pseudo file
1851	xptr_t txt_xp; // extended pointer on TXT_RX chdev
1852	chdev_t * txt_ptr; // local pointer on TXT_RX chdev
1853	cxy_t txt_cxy; // cluster of TXT_RX chdev
1854	uint32_t txt_id; // TXT_RX channel
1855	xptr_t owner_xp; // extended pointer on current TXT_RX owner
1856	xptr_t root_xp; // extended pointer on root of attached process list
1857	xptr_t lock_xp; // extended pointer on lock protecting attached process list
1858	xptr_t iter_xp; // iterator for xlist
1859	xptr_t current_xp; // extended pointer on current process
1860	process_t * current_ptr; // local pointer on current process
1861	cxy_t current_cxy; // cluster for current process
1862
1863	#if DEBUG_PROCESS_TXT
1864	uint32_t cycle;
1865	#endif
1866
1867	// get pointers on process in owner cluster
1868	process_cxy = GET_CXY( process_xp );
1869	process_ptr = GET_PTR( process_xp );
1870	process_pid = hal_remote_lw( XPTR( process_cxy , &process_ptr->pid ) );
1871
1872	// check owner cluster
1873	assert( (process_cxy == CXY_FROM_PID( process_pid )) ,
1874	"process descriptor not in owner cluster\n" );
1875
1876	// get extended pointer on stdin pseudo file
1877	file_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
1878
1879	// get pointers on TXT chdev
1880	txt_xp = chdev_from_file( file_xp );
1881	txt_cxy = GET_CXY( txt_xp );
1882	txt_ptr = GET_PTR( txt_xp );
1883
1884	// get extended pointer on TXT_RX owner and TXT channel
1885	owner_xp = hal_remote_lwd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) );
1886	txt_id = hal_remote_lw ( XPTR( txt_cxy , &txt_ptr->channel ) );
1887
1888	// transfer ownership only if process is the TXT owner
1889	if( (owner_xp == process_xp) && (txt_id > 0) )
1890	{
1891	// get extended pointers on root and lock of attached processes list
1892	root_xp = XPTR( txt_cxy , &txt_ptr->ext.txt.root );
1893	lock_xp = XPTR( txt_cxy , &txt_ptr->ext.txt.lock );
1894
1895	// get lock
1896	remote_spinlock_lock( lock_xp );
1897
1898	if( process_get_ppid( process_xp ) != 1 ) // process is not KSH
1899	{
1900	// scan attached process list to find KSH process
1901	XLIST_FOREACH( root_xp , iter_xp )
1902	{
1903	current_xp = XLIST_ELEMENT( iter_xp , process_t , txt_list );
1904	current_cxy = GET_CXY( current_xp );
1905	current_ptr = GET_PTR( current_xp );
1906
1907	if( process_get_ppid( current_xp ) == 1 ) // current is KSH
1908	{
1909	// release lock
1910	remote_spinlock_unlock( lock_xp );
1911
1912	// set owner field in TXT chdev
1913	hal_remote_swd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , current_xp );
1914
1915	#if DEBUG_PROCESS_TXT
1916	cycle = (uint32_t)hal_get_cycles();
1917	uint32_t ksh_pid = hal_remote_lw( XPTR( current_cxy , &current_ptr->pid ) );
1918	if( DEBUG_PROCESS_TXT < cycle )
1919	printk("\n[DBG] %s : thread %x in process %x release TXT %d to KSH %x / cycle %d\n",
1920	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, txt_id, ksh_pid, cycle );
1921	process_txt_display( txt_id );
1922	#endif
1923	return;
1924	}
1925	}
1926
1927	// release lock
1928	remote_spinlock_unlock( lock_xp );
1929
1930	// PANIC if KSH not found
1931	assert( false , "KSH process not found for TXT %d" );
1932
1933	return;
1934	}
1935	else // process is KSH
1936	{
1937	// scan attached process list to find another process
1938	XLIST_FOREACH( root_xp , iter_xp )
1939	{
1940	current_xp = XLIST_ELEMENT( iter_xp , process_t , txt_list );
1941	current_cxy = GET_CXY( current_xp );
1942	current_ptr = GET_PTR( current_xp );
1943
1944	if( current_xp != process_xp ) // current is not KSH
1945	{
1946	// release lock
1947	remote_spinlock_unlock( lock_xp );
1948
1949	// set owner field in TXT chdev
1950	hal_remote_swd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , current_xp );
1951
1952	#if DEBUG_PROCESS_TXT
1953	cycle = (uint32_t)hal_get_cycles();
1954	uint32_t new_pid = hal_remote_lw( XPTR( current_cxy , &current_ptr->pid ) );
1955	if( DEBUG_PROCESS_TXT < cycle )
1956	printk("\n[DBG] %s : thread %x in process %x release TXT %d to process %x / cycle %d\n",
1957	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, txt_id, new_pid, cycle );
1958	process_txt_display( txt_id );
1959	#endif
1960	return;
1961	}
1962	}
1963
1964	// release lock
1965	remote_spinlock_unlock( lock_xp );
1966
1967	// no more owner for TXT if no other process found
1968	hal_remote_swd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) , XPTR_NULL );
1969
1970	#if DEBUG_PROCESS_TXT
1971	cycle = (uint32_t)hal_get_cycles();
1972	if( DEBUG_PROCESS_TXT < cycle )
1973	printk("\n[DBG] %s : thread %x in process %x release TXT %d to nobody / cycle %d\n",
1974	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, txt_id, cycle );
1975	process_txt_display( txt_id );
1976	#endif
1977	return;
1978	}
1979	}
1980	else
1981	{
1982
1983	#if DEBUG_PROCESS_TXT
1984	cycle = (uint32_t)hal_get_cycles();
1985	if( DEBUG_PROCESS_TXT < cycle )
1986	printk("\n[DBG] %s : thread %x in process %d does nothing (not TXT owner) / cycle %d\n",
1987	__FUNCTION__, CURRENT_THREAD->trdid, process_pid, cycle );
1988	process_txt_display( txt_id );
1989	#endif
1990
1991	}
1992	} // end process_txt_transfer_ownership()
1993
1994
1995	//////////////////////////////////////////////////
1996	uint32_t process_txt_is_owner( xptr_t process_xp )
1997	{
1998	// get local pointer and cluster of process in owner cluster
1999	cxy_t process_cxy = GET_CXY( process_xp );
2000	process_t * process_ptr = GET_PTR( process_xp );
2001
2002	// check owner cluster
2003	pid_t process_pid = hal_remote_lw( XPTR( process_cxy , &process_ptr->pid ) );
2004	assert( (process_cxy == CXY_FROM_PID( process_pid )) ,
2005	"process descriptor not in owner cluster\n" );
2006
2007	// get extended pointer on stdin pseudo file
2008	xptr_t file_xp = hal_remote_lwd( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) );
2009
2010	// get pointers on TXT chdev
2011	xptr_t txt_xp = chdev_from_file( file_xp );
2012	cxy_t txt_cxy = GET_CXY( txt_xp );
2013	chdev_t * txt_ptr = GET_PTR( txt_xp );
2014
2015	// get extended pointer on TXT_RX owner process
2016	xptr_t owner_xp = hal_remote_lwd( XPTR( txt_cxy , &txt_ptr->ext.txt.owner_xp ) );
2017
2018	return (process_xp == owner_xp);
2019
2020	} // end process_txt_is_owner()
2021
2022	////////////////////////////////////////////////
2023	xptr_t process_txt_get_owner( uint32_t channel )
2024	{
2025	xptr_t txt_rx_xp = chdev_dir.txt_rx[channel];
2026	cxy_t txt_rx_cxy = GET_CXY( txt_rx_xp );
2027	chdev_t * txt_rx_ptr = GET_PTR( txt_rx_xp );
2028
2029	return (xptr_t)hal_remote_lwd( XPTR( txt_rx_cxy , &txt_rx_ptr->ext.txt.owner_xp ) );
2030
2031	} // end process_txt_get_owner()
2032
2033	///////////////////////////////////////////
2034	void process_txt_display( uint32_t txt_id )
2035	{
2036	xptr_t chdev_xp;
2037	cxy_t chdev_cxy;
2038	chdev_t * chdev_ptr;
2039	xptr_t root_xp;
2040	xptr_t lock_xp;
2041	xptr_t current_xp;
2042	xptr_t iter_xp;
2043	cxy_t txt0_cxy;
2044	chdev_t * txt0_ptr;
2045	xptr_t txt0_xp;
2046	xptr_t txt0_lock_xp;
2047	reg_t txt0_save_sr; // save SR to take TXT0 lock in busy mode
2048
2049	assert( (txt_id < LOCAL_CLUSTER->nb_txt_channels) ,
2050	"illegal TXT terminal index" );
2051
2052	// get pointers on TXT0 chdev
2053	txt0_xp = chdev_dir.txt_tx[0];
2054	txt0_cxy = GET_CXY( txt0_xp );
2055	txt0_ptr = GET_PTR( txt0_xp );
2056
2057	// get extended pointer on TXT0 lock
2058	txt0_lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
2059
2060	// get pointers on TXT_RX[txt_id] chdev
2061	chdev_xp = chdev_dir.txt_rx[txt_id];
2062	chdev_cxy = GET_CXY( chdev_xp );
2063	chdev_ptr = GET_PTR( chdev_xp );
2064
2065	// get extended pointer on root & lock of attached process list
2066	root_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.root );
2067	lock_xp = XPTR( chdev_cxy , &chdev_ptr->ext.txt.lock );
2068
2069	// get lock on attached process list
2070	remote_spinlock_lock( lock_xp );
2071
2072	// get TXT0 lock in busy waiting mode
2073	remote_spinlock_lock_busy( txt0_lock_xp , &txt0_save_sr );
2074
2075	// display header
2076	nolock_printk("\n***** processes attached to TXT_%d / cycle %d\n",
2077	txt_id , (uint32_t)hal_get_cycles() );
2078
2079	// scan attached process list
2080	XLIST_FOREACH( root_xp , iter_xp )
2081	{
2082	current_xp = XLIST_ELEMENT( iter_xp , process_t , txt_list );
2083	process_display( current_xp );
2084	}
2085
2086	// release TXT0 lock in busy waiting mode
2087	remote_spinlock_unlock_busy( txt0_lock_xp , txt0_save_sr );
2088
2089	// release lock on attached process list
2090	remote_spinlock_unlock( lock_xp );
2091
2092	} // end process_txt_display

Note: See TracBrowser for help on using the repository browser.

Context Navigation

source: trunk/kernel/kern/process.c @ 535

Download in other formats: