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source: trunk/kernel/kern/thread.c @ 615

Last change on this file since 615 was 611, checked in by alain, 6 years ago
Introduce sigificant modifs in VFS to support the <ls> command, and the . and .. directories entries.
File size: 49.2 KB

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1	/*
2	* thread.c - thread operations implementation (user & kernel)
3	*
4	* Author Ghassan Almaless (2008,2009,2010,2011,2012)
5	* Alain Greiner (2016,2017,2018)
6	*
7	* Copyright (c) UPMC Sorbonne Universites
8	*
9	* This file is part of ALMOS-MKH.
10	*
11	* ALMOS-MKH is free software; you can redistribute it and/or modify it
12	* under the terms of the GNU General Public License as published by
13	* the Free Software Foundation; version 2.0 of the License.
14	*
15	* ALMOS-MKH is distributed in the hope that it will be useful, but
16	* WITHOUT ANY WARRANTY; without even the implied warranty of
17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18	* General Public License for more details.
19	*
20	* You should have received a copy of the GNU General Public License
21	* along with ALMOS-MKH; if not, write to the Free Software Foundation,
22	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23	*/
24
25	#include <kernel_config.h>
26	#include <hal_kernel_types.h>
27	#include <hal_context.h>
28	#include <hal_irqmask.h>
29	#include <hal_special.h>
30	#include <hal_remote.h>
31	#include <memcpy.h>
32	#include <printk.h>
33	#include <cluster.h>
34	#include <process.h>
35	#include <scheduler.h>
36	#include <dev_pic.h>
37	#include <core.h>
38	#include <list.h>
39	#include <xlist.h>
40	#include <page.h>
41	#include <kmem.h>
42	#include <ppm.h>
43	#include <thread.h>
44	#include <rpc.h>
45
46	//////////////////////////////////////////////////////////////////////////////////////
47	// Extern global variables
48	//////////////////////////////////////////////////////////////////////////////////////
49
50	extern process_t process_zero; // allocated in kernel_init.c
51	extern char * lock_type_str[]; // allocated in kernel_init.c
52	extern chdev_directory_t chdev_dir; // allocated in kernel_init.c
53
54	//////////////////////////////////////////////////////////////////////////////////////
55	// This function returns a printable string for the thread type.
56	//////////////////////////////////////////////////////////////////////////////////////
57	const char * thread_type_str( thread_type_t type )
58	{
59	switch ( type ) {
60	case THREAD_USER: return "USR";
61	case THREAD_RPC: return "RPC";
62	case THREAD_DEV: return "DEV";
63	case THREAD_IDLE: return "IDL";
64	default: return "undefined";
65	}
66	}
67
68	/////////////////////////////////////////////////////////////////////////////////////
69	// This static function allocates physical memory for a thread descriptor.
70	// It can be called by the three functions:
71	// - thread_user_create()
72	// - thread_user_fork()
73	// - thread_kernel_create()
74	/////////////////////////////////////////////////////////////////////////////////////
75	// @ return pointer on thread descriptor if success / return NULL if failure.
76	/////////////////////////////////////////////////////////////////////////////////////
77	static thread_t * thread_alloc( void )
78	{
79	page_t * page; // pointer on page descriptor containing thread descriptor
80	kmem_req_t req; // kmem request
81
82	// allocates memory for thread descriptor + kernel stack
83	req.type = KMEM_PAGE;
84	req.size = CONFIG_THREAD_DESC_ORDER;
85	req.flags = AF_KERNEL \| AF_ZERO;
86	page = kmem_alloc( &req );
87
88	if( page == NULL ) return NULL;
89
90	// return pointer on new thread descriptor
91	xptr_t base_xp = ppm_page2base( XPTR(local_cxy , page ) );
92	return GET_PTR( base_xp );
93
94	} // end thread_alloc()
95
96
97	/////////////////////////////////////////////////////////////////////////////////////
98	// This static function releases the physical memory for a thread descriptor.
99	// It is called by the three functions:
100	// - thread_user_create()
101	// - thread_user_fork()
102	// - thread_kernel_create()
103	/////////////////////////////////////////////////////////////////////////////////////
104	// @ thread : pointer on thread descriptor.
105	/////////////////////////////////////////////////////////////////////////////////////
106	static void thread_release( thread_t * thread )
107	{
108	kmem_req_t req;
109
110	xptr_t base_xp = ppm_base2page( XPTR(local_cxy , thread ) );
111
112	req.type = KMEM_PAGE;
113	req.ptr = GET_PTR( base_xp );
114	kmem_free( &req );
115	}
116
117	/////////////////////////////////////////////////////////////////////////////////////
118	// This static function initializes a thread descriptor (kernel or user).
119	// It can be called by the four functions:
120	// - thread_user_create()
121	// - thread_user_fork()
122	// - thread_kernel_create()
123	// - thread_idle_init()
124	// It updates the local DQDT.
125	/////////////////////////////////////////////////////////////////////////////////////
126	// @ thread : pointer on local thread descriptor
127	// @ process : pointer on local process descriptor.
128	// @ type : thread type.
129	// @ func : pointer on thread entry function.
130	// @ args : pointer on thread entry function arguments.
131	// @ core_lid : target core local index.
132	// @ u_stack_base : stack base (user thread only)
133	// @ u_stack_size : stack base (user thread only)
134	/////////////////////////////////////////////////////////////////////////////////////
135	static error_t thread_init( thread_t * thread,
136	process_t * process,
137	thread_type_t type,
138	void * func,
139	void * args,
140	lid_t core_lid,
141	intptr_t u_stack_base,
142	uint32_t u_stack_size )
143	{
144	error_t error;
145	trdid_t trdid; // allocated thread identifier
146
147	cluster_t * local_cluster = LOCAL_CLUSTER;
148
149	#if DEBUG_THREAD_INIT
150	uint32_t cycle = (uint32_t)hal_get_cycles();
151	thread_t * this = CURRENT_THREAD;
152	if( DEBUG_THREAD_INIT < cycle )
153	printk("\n[%s] thread[%x,%x] enter for thread %x in process %x / cycle %d\n",
154	__FUNCTION__, this->process->pid, this->trdid, thread, process->pid , cycle );
155	#endif
156
157	// compute thread descriptor size without kernel stack
158	uint32_t desc_size = (intptr_t)(&thread->signature) - (intptr_t)thread + 4;
159
160	// Initialize new thread descriptor
161	thread->type = type;
162	thread->quantum = 0; // TODO
163	thread->ticks_nr = 0; // TODO
164	thread->time_last_check = 0; // TODO
165	thread->core = &local_cluster->core_tbl[core_lid];
166	thread->process = process;
167
168	thread->busylocks = 0;
169
170	#if DEBUG_BUSYLOCK
171	xlist_root_init( XPTR( local_cxy , &thread->busylocks_root ) );
172	#endif
173
174	thread->u_stack_base = u_stack_base;
175	thread->u_stack_size = u_stack_size;
176	thread->k_stack_base = (intptr_t)thread + desc_size;
177	thread->k_stack_size = CONFIG_THREAD_DESC_SIZE - desc_size;
178
179	thread->entry_func = func; // thread entry point
180	thread->entry_args = args; // thread function arguments
181	thread->flags = 0; // all flags reset
182	thread->errno = 0; // no error detected
183	thread->fork_user = 0; // no user defined placement for fork
184	thread->fork_cxy = 0; // user defined target cluster for fork
185	thread->blocked = THREAD_BLOCKED_GLOBAL;
186
187	// register new thread in process descriptor, and get a TRDID
188	error = process_register_thread( process, thread , &trdid );
189
190	if( error )
191	{
192	printk("\n[ERROR] in %s : thread %x in process %x cannot get TRDID in cluster %x\n"
193	" for thread %s in process %x / cycle %d\n",
194	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
195	local_cxy, thread_type_str(type), process->pid, (uint32_t)hal_get_cycles() );
196	return EINVAL;
197	}
198
199	// initialize trdid
200	thread->trdid = trdid;
201
202	// initialize sched list
203	list_entry_init( &thread->sched_list );
204
205	// initialize waiting queue entries
206	list_entry_init( &thread->wait_list );
207	xlist_entry_init( XPTR( local_cxy , &thread->wait_xlist ) );
208
209	// initialize thread info
210	memset( &thread->info , 0 , sizeof(thread_info_t) );
211
212	// initialize join_lock
213	remote_busylock_init( XPTR( local_cxy , &thread->join_lock ), LOCK_THREAD_JOIN );
214
215	// initialise signature
216	thread->signature = THREAD_SIGNATURE;
217
218	// FIXME define and call an architecture specific hal_thread_init()
219	// function to initialise the save_sr field
220	thread->save_sr = 0xFF13;
221
222	// register new thread in core scheduler
223	sched_register_thread( thread->core , thread );
224
225	// update DQDT
226	dqdt_increment_threads();
227
228	#if DEBUG_THREAD_INIT
229	cycle = (uint32_t)hal_get_cycles();
230	if( DEBUG_THREAD_INIT < cycle )
231	printk("\n[%s] thread[%x,%x] exit for thread %x in process %x / cycle %d\n",
232	__FUNCTION__, this->process->pid, this->trdid, thread, process->pid, cycle );
233	#endif
234
235	return 0;
236
237	} // end thread_init()
238
239	/////////////////////////////////////////////////////////
240	error_t thread_user_create( pid_t pid,
241	void * start_func,
242	void * start_arg,
243	pthread_attr_t * attr,
244	thread_t ** new_thread )
245	{
246	error_t error;
247	thread_t * thread; // pointer on created thread descriptor
248	process_t * process; // pointer to local process descriptor
249	lid_t core_lid; // selected core local index
250	vseg_t * vseg; // stack vseg
251
252	assert( (attr != NULL) , "pthread attributes must be defined" );
253
254	#if DEBUG_THREAD_USER_CREATE
255	thread_t * this = CURRENT_THREAD;
256	uint32_t cycle = (uint32_t)hal_get_cycles();
257	if( DEBUG_THREAD_USER_CREATE < cycle )
258	printk("\n[%s] thread[%x,%x] enter in cluster %x for process %x / cycle %d\n",
259	__FUNCTION__, this->process->pid , this->trdid , local_cxy , pid , cycle );
260	#endif
261
262	// get process descriptor local copy
263	process = process_get_local_copy( pid );
264
265	if( process == NULL )
266	{
267	printk("\n[ERROR] in %s : cannot get process descriptor %x\n",
268	__FUNCTION__ , pid );
269	return ENOMEM;
270	}
271
272	#if( DEBUG_THREAD_USER_CREATE & 1)
273	if( DEBUG_THREAD_USER_CREATE < cycle )
274	printk("\n[%s] process descriptor = %x for process %x in cluster %x\n",
275	__FUNCTION__, process , pid , local_cxy );
276	#endif
277
278	// select a target core in local cluster
279	if( attr->attributes & PT_ATTR_CORE_DEFINED )
280	{
281	core_lid = attr->lid;
282	if( core_lid >= LOCAL_CLUSTER->cores_nr )
283	{
284	printk("\n[ERROR] in %s : illegal core index attribute = %d\n",
285	__FUNCTION__ , core_lid );
286	return EINVAL;
287	}
288	}
289	else
290	{
291	core_lid = cluster_select_local_core();
292	}
293
294	#if( DEBUG_THREAD_USER_CREATE & 1)
295	if( DEBUG_THREAD_USER_CREATE < cycle )
296	printk("\n[%s] core[%x,%d] selected\n",
297	__FUNCTION__, local_cxy , core_lid );
298	#endif
299
300	// allocate a stack from local VMM
301	vseg = vmm_create_vseg( process,
302	VSEG_TYPE_STACK,
303	0, // size unused
304	0, // length unused
305	0, // file_offset unused
306	0, // file_size unused
307	XPTR_NULL, // mapper_xp unused
308	local_cxy );
309
310	if( vseg == NULL )
311	{
312	printk("\n[ERROR] in %s : cannot create stack vseg\n", __FUNCTION__ );
313	return ENOMEM;
314	}
315
316	#if( DEBUG_THREAD_USER_CREATE & 1)
317	if( DEBUG_THREAD_USER_CREATE < cycle )
318	printk("\n[%s] stack vseg created / vpn_base %x / %d pages\n",
319	__FUNCTION__, vseg->vpn_base, vseg->vpn_size );
320	#endif
321
322	// allocate memory for thread descriptor
323	thread = thread_alloc();
324
325	if( thread == NULL )
326	{
327	printk("\n[ERROR] in %s : cannot create new thread\n", __FUNCTION__ );
328	vmm_delete_vseg( process->pid , vseg->min );
329	return ENOMEM;
330	}
331
332	#if( DEBUG_THREAD_USER_CREATE & 1)
333	if( DEBUG_THREAD_USER_CREATE < cycle )
334	printk("\n[%s] new thread descriptor %x allocated\n",
335	__FUNCTION__, thread );
336	#endif
337
338	// initialize thread descriptor
339	error = thread_init( thread,
340	process,
341	THREAD_USER,
342	start_func,
343	start_arg,
344	core_lid,
345	vseg->min,
346	vseg->max - vseg->min );
347	if( error )
348	{
349	printk("\n[ERROR] in %s : cannot initialize new thread\n", __FUNCTION__ );
350	vmm_delete_vseg( process->pid , vseg->min );
351	thread_release( thread );
352	return EINVAL;
353	}
354
355	#if( DEBUG_THREAD_USER_CREATE & 1)
356	if( DEBUG_THREAD_USER_CREATE < cycle )
357	printk("\n[%s] new thread descriptor initialised / trdid %x\n",
358	__FUNCTION__, thread->trdid );
359	#endif
360
361	// set DETACHED flag if required
362	if( attr->attributes & PT_ATTR_DETACH )
363	{
364	thread->flags \|= THREAD_FLAG_DETACHED;
365	}
366
367	// allocate & initialize CPU context
368	if( hal_cpu_context_alloc( thread ) )
369	{
370	printk("\n[ERROR] in %s : cannot create CPU context\n", __FUNCTION__ );
371	vmm_delete_vseg( process->pid , vseg->min );
372	thread_release( thread );
373	return ENOMEM;
374	}
375	hal_cpu_context_init( thread );
376
377	// allocate & initialize FPU context
378	if( hal_fpu_context_alloc( thread ) )
379	{
380	printk("\n[ERROR] in %s : cannot create FPU context\n", __FUNCTION__ );
381	vmm_delete_vseg( process->pid , vseg->min );
382	thread_release( thread );
383	return ENOMEM;
384	}
385	hal_fpu_context_init( thread );
386
387	#if( DEBUG_THREAD_USER_CREATE & 1)
388	if( DEBUG_THREAD_USER_CREATE < cycle )
389	printk("\n[%s] CPU & FPU contexts created\n",
390	__FUNCTION__, thread->trdid );
391	vmm_display( process , true );
392	#endif
393
394	#if DEBUG_THREAD_USER_CREATE
395	cycle = (uint32_t)hal_get_cycles();
396	if( DEBUG_THREAD_USER_CREATE < cycle )
397	printk("\n[%s] thread[%x,%x] exit / new_thread %x / core %d / cycle %d\n",
398	__FUNCTION__, this->process->pid , this->trdid , thread->trdid, core_lid, cycle );
399	#endif
400
401	*new_thread = thread;
402	return 0;
403
404	} // end thread_user_create()
405
406	///////////////////////////////////////////////////////
407	error_t thread_user_fork( xptr_t parent_thread_xp,
408	process_t * child_process,
409	thread_t ** child_thread )
410	{
411	error_t error;
412	thread_t * child_ptr; // local pointer on local child thread
413	lid_t core_lid; // selected core local index
414
415	thread_t * parent_ptr; // local pointer on remote parent thread
416	cxy_t parent_cxy; // parent thread cluster
417	process_t * parent_process; // local pointer on parent process
418	xptr_t parent_gpt_xp; // extended pointer on parent thread GPT
419
420	void * func; // parent thread entry_func
421	void * args; // parent thread entry_args
422	intptr_t base; // parent thread u_stack_base
423	uint32_t size; // parent thread u_stack_size
424	uint32_t flags; // parent_thread flags
425	vpn_t vpn_base; // parent thread stack vpn_base
426	vpn_t vpn_size; // parent thread stack vpn_size
427	reg_t * uzone; // parent thread pointer on uzone
428
429	vseg_t * vseg; // child thread STACK vseg
430
431	#if DEBUG_THREAD_USER_FORK
432	uint32_t cycle = (uint32_t)hal_get_cycles();
433	thread_t * this = CURRENT_THREAD;
434	if( DEBUG_THREAD_USER_FORK < cycle )
435	printk("\n[%s] thread[%x,%x] enter / child_process %x / cycle %d\n",
436	__FUNCTION__, this->process->pid, this->trdid, child_process->pid, cycle );
437	#endif
438
439	// select a target core in local cluster
440	core_lid = cluster_select_local_core();
441
442	// get cluster and local pointer on parent thread descriptor
443	parent_cxy = GET_CXY( parent_thread_xp );
444	parent_ptr = GET_PTR( parent_thread_xp );
445
446	// get relevant fields from parent thread
447	func = (void *) hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->entry_func ));
448	args = (void *) hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->entry_args ));
449	base = (intptr_t)hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->u_stack_base ));
450	size = (uint32_t)hal_remote_l32 ( XPTR( parent_cxy , &parent_ptr->u_stack_size ));
451	flags = hal_remote_l32 ( XPTR( parent_cxy , &parent_ptr->flags ));
452	uzone = (reg_t *) hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->uzone_current ));
453
454	vpn_base = base >> CONFIG_PPM_PAGE_SHIFT;
455	vpn_size = size >> CONFIG_PPM_PAGE_SHIFT;
456
457	// get pointer on parent process in parent thread cluster
458	parent_process = (process_t *)hal_remote_lpt( XPTR( parent_cxy,
459	&parent_ptr->process ) );
460
461	// get extended pointer on parent GPT in parent thread cluster
462	parent_gpt_xp = XPTR( parent_cxy , &parent_process->vmm.gpt );
463
464	// allocate memory for child thread descriptor
465	child_ptr = thread_alloc();
466	if( child_ptr == NULL )
467	{
468	printk("\n[ERROR] in %s : cannot allocate new thread\n", __FUNCTION__ );
469	return -1;
470	}
471
472	// initialize thread descriptor
473	error = thread_init( child_ptr,
474	child_process,
475	THREAD_USER,
476	func,
477	args,
478	core_lid,
479	base,
480	size );
481	if( error )
482	{
483	printk("\n[ERROR] in %s : cannot initialize child thread\n", __FUNCTION__ );
484	thread_release( child_ptr );
485	return EINVAL;
486	}
487
488	#if (DEBUG_THREAD_USER_FORK & 1)
489	if( DEBUG_THREAD_USER_FORK < cycle )
490	printk("\n[%s] thread[%x,%x] initialised thread %x in process %x\n",
491	__FUNCTION__, this->process->pid, this->trdid, child_ptr->trdid, child_process->pid );
492	#endif
493
494	// return child pointer
495	*child_thread = child_ptr;
496
497	// set detached flag if required
498	if( flags & THREAD_FLAG_DETACHED ) child_ptr->flags = THREAD_FLAG_DETACHED;
499
500	// update uzone pointer in child thread descriptor
501	child_ptr->uzone_current = (char *)((intptr_t)uzone +
502	(intptr_t)child_ptr -
503	(intptr_t)parent_ptr );
504
505
506	// allocate CPU context for child thread
507	if( hal_cpu_context_alloc( child_ptr ) )
508	{
509	printk("\n[ERROR] in %s : cannot allocate CPU context\n", __FUNCTION__ );
510	thread_release( child_ptr );
511	return -1;
512	}
513
514	// allocate FPU context for child thread
515	if( hal_fpu_context_alloc( child_ptr ) )
516	{
517	printk("\n[ERROR] in %s : cannot allocate FPU context\n", __FUNCTION__ );
518	thread_release( child_ptr );
519	return -1;
520	}
521
522	#if (DEBUG_THREAD_USER_FORK & 1)
523	if( DEBUG_THREAD_USER_FORK < cycle )
524	printk("\n[%s] thread[%x,%x] created CPU & FPU contexts for thread %x in process %x\n",
525	__FUNCTION__, this->process->pid, this->trdid, child_ptr->trdid, child_process->pid );
526	#endif
527
528	// create and initialize STACK vseg
529	vseg = vseg_alloc();
530	vseg_init( vseg,
531	VSEG_TYPE_STACK,
532	base,
533	size,
534	vpn_base,
535	vpn_size,
536	0, 0, XPTR_NULL, // not a file vseg
537	local_cxy );
538
539	// register STACK vseg in local child VSL
540	vmm_attach_vseg_to_vsl( &child_process->vmm , vseg );
541
542	#if (DEBUG_THREAD_USER_FORK & 1)
543	if( DEBUG_THREAD_USER_FORK < cycle )
544	printk("\n[%s] thread[%x,%x] created stack vseg for thread %x in process %x\n",
545	__FUNCTION__, this->process->pid, this->trdid, child_ptr->trdid, child_process->pid );
546	#endif
547
548	// copy all valid STACK GPT entries
549	vpn_t vpn;
550	bool_t mapped;
551	ppn_t ppn;
552	for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ )
553	{
554	error = hal_gpt_pte_copy( &child_process->vmm.gpt,
555	parent_gpt_xp,
556	vpn,
557	true, // set cow
558	&ppn,
559	&mapped );
560	if( error )
561	{
562	vmm_detach_vseg_from_vsl( &child_process->vmm , vseg );
563	thread_release( child_ptr );
564	printk("\n[ERROR] in %s : cannot update child GPT\n", __FUNCTION__ );
565	return -1;
566	}
567
568	// increment pending forks counter for the page if mapped
569	if( mapped )
570	{
571	// get pointers on the page descriptor
572	xptr_t page_xp = ppm_ppn2page( ppn );
573	cxy_t page_cxy = GET_CXY( page_xp );
574	page_t * page_ptr = GET_PTR( page_xp );
575
576	// get extended pointers on forks and lock fields
577	xptr_t forks_xp = XPTR( page_cxy , &page_ptr->forks );
578	xptr_t lock_xp = XPTR( page_cxy , &page_ptr->lock );
579
580	// get lock protecting page
581	remote_busylock_acquire( lock_xp );
582
583	// increment the forks counter in page descriptor
584	hal_remote_atomic_add( forks_xp , 1 );
585
586	// release lock protecting page
587	remote_busylock_release( lock_xp );
588
589	#if (DEBUG_THREAD_USER_FORK & 1)
590	cycle = (uint32_t)hal_get_cycles();
591	if( DEBUG_THREAD_USER_FORK < cycle )
592	printk("\n[%s] thread[%x,%x] copied one PTE to child GPT : vpn %x / forks %d\n",
593	__FUNCTION__, this->process->pid, this->trdid,
594	vpn, hal_remote_l32( XPTR( page_cxy , &page_ptr->forks) ) );
595	#endif
596
597	}
598	}
599
600	// set COW flag for all mapped entries of STAK vseg in parent thread GPT
601	hal_gpt_set_cow( parent_gpt_xp,
602	vpn_base,
603	vpn_size );
604
605	#if DEBUG_THREAD_USER_FORK
606	cycle = (uint32_t)hal_get_cycles();
607	if( DEBUG_THREAD_USER_FORK < cycle )
608	printk("\n[%s] thread[%x,%x] exit / child_thread %x / cycle %d\n",
609	__FUNCTION__, this->process->pid, this->trdid, child_ptr, cycle );
610	#endif
611
612	return 0;
613
614	} // end thread_user_fork()
615
616	////////////////////////////////////////////////
617	error_t thread_user_exec( void * entry_func,
618	uint32_t argc,
619	char ** argv )
620	{
621	thread_t * thread = CURRENT_THREAD;
622	process_t * process = thread->process;
623
624	#if DEBUG_THREAD_USER_EXEC
625	uint32_t cycle = (uint32_t)hal_get_cycles();
626	if( DEBUG_THREAD_USER_EXEC < cycle )
627	printk("\n[%s] thread[%x,%x] enter / cycle %d\n",
628	__FUNCTION__, process->pid, thread->trdid, cycle );
629	#endif
630
631	// check parent thread attributes
632	assert( (thread->type == THREAD_USER ) , "bad type" );
633	assert( (thread->signature == THREAD_SIGNATURE) , "bad signature" );
634	assert( (thread->busylocks == 0) , "bad busylocks" );
635
636	// re-initialize various thread descriptor fields
637	thread->quantum = 0; // TODO
638	thread->ticks_nr = 0; // TODO
639	thread->time_last_check = 0; // TODO
640
641	thread->entry_func = entry_func;
642	thread->main_argc = argc;
643	thread->main_argv = argv;
644
645	// the main thread is always detached
646	thread->flags = THREAD_FLAG_DETACHED;
647	thread->blocked = 0;
648	thread->errno = 0;
649	thread->fork_user = 0; // not inherited
650	thread->fork_cxy = 0; // not inherited
651
652	// re-initialize busylocks counters
653	thread->busylocks = 0;
654
655	// reset thread info
656	memset( &thread->info , 0 , sizeof(thread_info_t) );
657
658	// re-initialize join_lock
659	remote_busylock_init( XPTR( local_cxy , &thread->join_lock ), LOCK_THREAD_JOIN );
660
661	// allocate an user stack vseg for main thread
662	vseg_t * vseg = vmm_create_vseg( process,
663	VSEG_TYPE_STACK,
664	0, // size unused
665	0, // length unused
666	0, // file_offset unused
667	0, // file_size unused
668	XPTR_NULL, // mapper_xp unused
669	local_cxy );
670	if( vseg == NULL )
671	{
672	printk("\n[ERROR] in %s : cannot create stack vseg for main thread\n", __FUNCTION__ );
673	return -1;
674	}
675
676	// update user stack in thread descriptor
677	thread->u_stack_base = vseg->min;
678	thread->u_stack_size = vseg->max - vseg->min;
679
680	// release FPU ownership if required
681	if( thread->core->fpu_owner == thread ) thread->core->fpu_owner = NULL;
682
683	// re-initialize FPU context
684	hal_fpu_context_init( thread );
685
686	#if DEBUG_THREAD_USER_EXEC
687	cycle = (uint32_t)hal_get_cycles();
688	if( DEBUG_THREAD_USER_EXEC < cycle )
689	printk("\n[%s] thread[%x,%x] set CPU context & jump to user code / cycle %d\n",
690	__FUNCTION__, process->pid, thread->trdid, cycle );
691	vmm_display( process , true );
692	#endif
693
694	// re-initialize CPU context... and jump to user code
695	hal_cpu_context_exec( thread );
696
697	assert( false, "we should not execute this code");
698
699	return 0;
700
701	} // end thread_user_exec()
702
703	/////////////////////////////////////////////////////////
704	error_t thread_kernel_create( thread_t ** new_thread,
705	thread_type_t type,
706	void * func,
707	void * args,
708	lid_t core_lid )
709	{
710	error_t error;
711	thread_t * thread; // pointer on new thread descriptor
712
713	thread_t * this = CURRENT_THREAD;
714
715	assert( ( (type == THREAD_IDLE) \|\| (type == THREAD_RPC) \|\| (type == THREAD_DEV) ) ,
716	"illegal thread type" );
717
718	assert( (core_lid < LOCAL_CLUSTER->cores_nr) ,
719	"illegal core_lid" );
720
721	#if DEBUG_THREAD_KERNEL_CREATE
722	uint32_t cycle = (uint32_t)hal_get_cycles();
723	if( DEBUG_THREAD_KERNEL_CREATE < cycle )
724	printk("\n[%s] thread[%x,%x] enter / requested_type %s / cycle %d\n",
725	__FUNCTION__, this->process->pid, this->trdid, thread_type_str(type), cycle );
726	#endif
727
728	// allocate memory for new thread descriptor
729	thread = thread_alloc();
730
731	if( thread == NULL )
732	{
733	printk("\n[ERROR] in %s : thread %x in process %x\n"
734	" no memory for thread descriptor\n",
735	__FUNCTION__, this->trdid, this->process->pid );
736	return ENOMEM;
737	}
738
739	// initialize thread descriptor
740	error = thread_init( thread,
741	&process_zero,
742	type,
743	func,
744	args,
745	core_lid,
746	0 , 0 ); // no user stack for a kernel thread
747
748	if( error ) // release allocated memory for thread descriptor
749	{
750	printk("\n[ERROR] in %s : thread %x in process %x\n"
751	" cannot initialize thread descriptor\n",
752	__FUNCTION__, this->trdid, this->process->pid );
753	thread_release( thread );
754	return ENOMEM;
755	}
756
757	// allocate & initialize CPU context
758	error = hal_cpu_context_alloc( thread );
759
760	if( error )
761	{
762	printk("\n[ERROR] in %s : thread %x in process %x\n"
763	" cannot create CPU context\n",
764	__FUNCTION__, this->trdid, this->process->pid );
765	thread_release( thread );
766	return EINVAL;
767	}
768
769	hal_cpu_context_init( thread );
770
771	// set THREAD_BLOCKED_IDLE for DEV threads
772	if( type == THREAD_DEV ) thread->blocked \|= THREAD_BLOCKED_IDLE;
773
774	#if DEBUG_THREAD_KERNEL_CREATE
775	cycle = (uint32_t)hal_get_cycles();
776	if( DEBUG_THREAD_KERNEL_CREATE < cycle )
777	printk("\n[%s] thread[%x,%x] exit / new_thread %x / type %s / cycle %d\n",
778	__FUNCTION__, this->process->pid, this->trdid, thread, thread_type_str(type), cycle );
779	#endif
780
781	*new_thread = thread;
782	return 0;
783
784	} // end thread_kernel_create()
785
786	//////////////////////////////////////////////
787	void thread_idle_init( thread_t * thread,
788	thread_type_t type,
789	void * func,
790	void * args,
791	lid_t core_lid )
792	{
793
794	// check arguments
795	assert( (type == THREAD_IDLE) , "illegal thread type" );
796	assert( (core_lid < LOCAL_CLUSTER->cores_nr) , "illegal core index" );
797
798	// initialize thread descriptor
799	error_t error = thread_init( thread,
800	&process_zero,
801	type,
802	func,
803	args,
804	core_lid,
805	0 , 0 ); // no user stack for a kernel thread
806
807	assert( (error == 0), "cannot create thread idle" );
808
809	// allocate & initialize CPU context if success
810	error = hal_cpu_context_alloc( thread );
811
812	assert( (error == 0), "cannot allocate CPU context" );
813
814	hal_cpu_context_init( thread );
815
816	} // end thread_idle_init()
817
818	///////////////////////////////////////////////////////////////////////////////////////
819	// TODO: check that all memory dynamically allocated during thread execution
820	// has been released => check vmm destroy for MMAP vsegs [AG]
821	///////////////////////////////////////////////////////////////////////////////////////
822	void thread_destroy( thread_t * thread )
823	{
824	reg_t save_sr;
825
826	process_t * process = thread->process;
827	core_t * core = thread->core;
828
829	#if DEBUG_THREAD_DESTROY
830	uint32_t cycle = (uint32_t)hal_get_cycles();
831	thread_t * this = CURRENT_THREAD;
832	if( DEBUG_THREAD_DESTROY < cycle )
833	printk("\n[%s] thread[%x,%x] enter to destroy thread[%x,%x] / cycle %d\n",
834	__FUNCTION__, this->process->pid, this->trdid, process->pid, thread->trdid, cycle );
835	#endif
836
837	// check busylocks counter
838	thread_assert_can_yield( thread , __FUNCTION__ );
839
840	// update intrumentation values
841	process->vmm.pgfault_nr += thread->info.pgfault_nr;
842
843	// release memory allocated for CPU context and FPU context
844	hal_cpu_context_destroy( thread );
845	if ( thread->type == THREAD_USER ) hal_fpu_context_destroy( thread );
846
847	// release FPU ownership if required
848	hal_disable_irq( &save_sr );
849	if( core->fpu_owner == thread )
850	{
851	core->fpu_owner = NULL;
852	hal_fpu_disable();
853	}
854	hal_restore_irq( save_sr );
855
856	// invalidate thread descriptor
857	thread->signature = 0;
858
859	// release memory for thread descriptor
860	thread_release( thread );
861
862	#if DEBUG_THREAD_DESTROY
863	cycle = (uint32_t)hal_get_cycles();
864	if( DEBUG_THREAD_DESTROY < cycle )
865	printk("\n[%s] thread[%x,%x] exit / destroyed thread[%x,%x] / cycle %d\n",
866	__FUNCTION__, this->process->pid, this->trdid, process->pid, thread->trdid, cycle );
867	#endif
868
869	} // end thread_destroy()
870
871	//////////////////////////////////////////////////
872	inline void thread_set_req_ack( thread_t * target,
873	uint32_t * rsp_count )
874	{
875	reg_t save_sr; // for critical section
876
877	// get pointer on target thread scheduler
878	scheduler_t * sched = &target->core->scheduler;
879
880	// wait scheduler ready to handle a new request
881	while( sched->req_ack_pending ) asm volatile( "nop" );
882
883	// enter critical section
884	hal_disable_irq( &save_sr );
885
886	// set request in target thread scheduler
887	sched->req_ack_pending = true;
888
889	// set ack request in target thread "flags"
890	hal_atomic_or( &target->flags , THREAD_FLAG_REQ_ACK );
891
892	// set pointer on responses counter in target thread
893	target->ack_rsp_count = rsp_count;
894
895	// exit critical section
896	hal_restore_irq( save_sr );
897
898	hal_fence();
899
900	} // thread_set_req_ack()
901
902	/////////////////////////////////////////////////////
903	inline void thread_reset_req_ack( thread_t * target )
904	{
905	reg_t save_sr; // for critical section
906
907	// get pointer on target thread scheduler
908	scheduler_t * sched = &target->core->scheduler;
909
910	// check signal pending in scheduler
911	assert( sched->req_ack_pending , "no pending signal" );
912
913	// enter critical section
914	hal_disable_irq( &save_sr );
915
916	// reset signal in scheduler
917	sched->req_ack_pending = false;
918
919	// reset signal in thread "flags"
920	hal_atomic_and( &target->flags , ~THREAD_FLAG_REQ_ACK );
921
922	// reset pointer on responses counter
923	target->ack_rsp_count = NULL;
924
925	// exit critical section
926	hal_restore_irq( save_sr );
927
928	hal_fence();
929
930	} // thread_reset_req_ack()
931
932	//////////////////////////////////////
933	void thread_block( xptr_t thread_xp,
934	uint32_t cause )
935	{
936	// get thread cluster and local pointer
937	cxy_t cxy = GET_CXY( thread_xp );
938	thread_t * ptr = GET_PTR( thread_xp );
939
940	// set blocking cause
941	hal_remote_atomic_or( XPTR( cxy , &ptr->blocked ) , cause );
942	hal_fence();
943
944	#if DEBUG_THREAD_BLOCK
945	uint32_t cycle = (uint32_t)hal_get_cycles();
946	process_t * process = hal_remote_lpt( XPTR( cxy , &ptr->process ) );
947	thread_t * this = CURRENT_THREAD;
948	if( DEBUG_THREAD_BLOCK < cycle )
949	printk("\n[%s] thread[%x,%x] blocked thread %x in process %x / cause %x\n",
950	__FUNCTION__, this->process->pid, this->trdid,
951	ptr->trdid, hal_remote_l32(XPTR( cxy , &process->pid )), cause );
952	#endif
953
954	} // end thread_block()
955
956	////////////////////////////////////////////
957	uint32_t thread_unblock( xptr_t thread_xp,
958	uint32_t cause )
959	{
960	// get thread cluster and local pointer
961	cxy_t cxy = GET_CXY( thread_xp );
962	thread_t * ptr = GET_PTR( thread_xp );
963
964	// reset blocking cause
965	uint32_t previous = hal_remote_atomic_and( XPTR( cxy , &ptr->blocked ) , ~cause );
966	hal_fence();
967
968	#if DEBUG_THREAD_BLOCK
969	uint32_t cycle = (uint32_t)hal_get_cycles();
970	process_t * process = hal_remote_lpt( XPTR( cxy , &ptr->process ) );
971	thread_t * this = CURRENT_THREAD;
972	if( DEBUG_THREAD_BLOCK < cycle )
973	printk("\n[%s] thread[%x,%x] unblocked thread %x in process %x / cause %x\n",
974	__FUNCTION__, this->process->pid, this->trdid,
975	ptr->trdid, hal_remote_l32(XPTR( cxy , &process->pid )), cause );
976	#endif
977
978	// return a non zero value if the cause bit is modified
979	return( previous & cause );
980
981	} // end thread_unblock()
982
983	//////////////////////////////////////
984	void thread_delete( xptr_t target_xp,
985	pid_t pid,
986	bool_t is_forced )
987	{
988	reg_t save_sr; // for critical section
989	bool_t target_join_done; // joining thread arrived first
990	bool_t target_attached; // target thread attached
991	xptr_t killer_xp; // extended pointer on killer thread (this)
992	thread_t * killer_ptr; // pointer on killer thread (this)
993	cxy_t target_cxy; // target thread cluster
994	thread_t * target_ptr; // pointer on target thread
995	xptr_t target_flags_xp; // extended pointer on target thread <flags>
996	xptr_t target_join_lock_xp; // extended pointer on target thread <join_lock>
997	xptr_t target_join_xp_xp; // extended pointer on target thread <join_xp>
998	trdid_t target_trdid; // target thread identifier
999	ltid_t target_ltid; // target thread local index
1000	xptr_t joining_xp; // extended pointer on joining thread
1001	thread_t * joining_ptr; // pointer on joining thread
1002	cxy_t joining_cxy; // joining thread cluster
1003
1004	// get target thread cluster and local pointer
1005	target_cxy = GET_CXY( target_xp );
1006	target_ptr = GET_PTR( target_xp );
1007
1008	// get target thread identifiers, and attached flag
1009	target_trdid = hal_remote_l32( XPTR( target_cxy , &target_ptr->trdid ) );
1010	target_ltid = LTID_FROM_TRDID( target_trdid );
1011	target_flags_xp = XPTR( target_cxy , &target_ptr->flags );
1012	target_attached = ( (hal_remote_l32( target_flags_xp ) & THREAD_FLAG_DETACHED) == 0 );
1013
1014	// get killer thread pointers
1015	killer_ptr = CURRENT_THREAD;
1016	killer_xp = XPTR( local_cxy , killer_ptr );
1017
1018	#if DEBUG_THREAD_DELETE
1019	uint32_t cycle = (uint32_t)hal_get_cycles();
1020	if( DEBUG_THREAD_DELETE < cycle )
1021	printk("\n[%s] killer[%x,%x] enters / target[%x,%x] / cycle %d\n",
1022	__FUNCTION__, killer_ptr->process->pid, killer_ptr->trdid,
1023	target_ptr->process->pid, target_ptr->trdid, cycle );
1024	#endif
1025
1026	// check target thread is not the main thread, because the main thread
1027	// must be deleted by the parent process sys_wait() function
1028	assert( ((CXY_FROM_PID( pid ) != target_cxy) \|\| (target_ltid != 0)),
1029	"tharget thread cannot be the main thread\n" );
1030
1031	// check killer thread can yield
1032	thread_assert_can_yield( killer_ptr , __FUNCTION__ );
1033
1034	// if the target thread is attached, we must synchonize with the joining thread
1035	// before blocking and marking the target thead for delete.
1036
1037	if( target_attached && (is_forced == false) ) // synchronize with joining thread
1038	{
1039	// build extended pointers on target thread join fields
1040	target_join_lock_xp = XPTR( target_cxy , &target_ptr->join_lock );
1041	target_join_xp_xp = XPTR( target_cxy , &target_ptr->join_xp );
1042
1043	// enter critical section
1044	hal_disable_irq( &save_sr );
1045
1046	// take the join_lock in target thread descriptor
1047	remote_busylock_acquire( target_join_lock_xp );
1048
1049	// get join_done from target thread descriptor
1050	target_join_done = ((hal_remote_l32( target_flags_xp ) & THREAD_FLAG_JOIN_DONE) != 0);
1051
1052	if( target_join_done ) // joining thread arrived first
1053	{
1054	// get extended pointer on joining thread
1055	joining_xp = (xptr_t)hal_remote_l64( target_join_xp_xp );
1056	joining_ptr = GET_PTR( joining_xp );
1057	joining_cxy = GET_CXY( joining_xp );
1058
1059	// reset the join_done flag in target thread
1060	hal_remote_atomic_and( target_flags_xp , ~THREAD_FLAG_JOIN_DONE );
1061
1062	// unblock the joining thread
1063	thread_unblock( joining_xp , THREAD_BLOCKED_JOIN );
1064
1065	// release the join_lock in target thread descriptor
1066	remote_busylock_release( target_join_lock_xp );
1067
1068	// block the target thread
1069	thread_block( target_xp , THREAD_BLOCKED_GLOBAL );
1070
1071	// set the REQ_DELETE flag in target thread descriptor
1072	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_REQ_DELETE );
1073
1074	// exit critical section
1075	hal_restore_irq( save_sr );
1076
1077	#if DEBUG_THREAD_DELETE
1078	cycle = (uint32_t)hal_get_cycles;
1079	if( DEBUG_THREAD_DELETE < cycle )
1080	printk("\n[%s] killer[%x,%x] exit / target[%x,%x] marked after join / cycle %d\n",
1081	__FUNCTION__, killer_ptr->process->pid, killer_ptr->trdid,
1082	target_ptr->process->pid, target_ptr->trdid, cycle );
1083	#endif
1084
1085	}
1086	else // killer thread arrived first
1087	{
1088	// set the kill_done flag in target thread
1089	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_KILL_DONE );
1090
1091	// block this thread on BLOCKED_JOIN
1092	thread_block( killer_xp , THREAD_BLOCKED_JOIN );
1093
1094	// set extended pointer on killer thread in target thread
1095	hal_remote_s64( target_join_xp_xp , killer_xp );
1096
1097	// release the join_lock in target thread descriptor
1098	remote_busylock_release( target_join_lock_xp );
1099
1100	#if DEBUG_THREAD_DELETE
1101	cycle = (uint32_t)hal_get_cycles;
1102	if( DEBUG_THREAD_DELETE < cycle )
1103	printk("\n[%s] killer[%x,%x] deschedules / target[%x,%x] not completed / cycle %d\n",
1104	__FUNCTION__, killer_ptr->process->pid, killer_ptr->trdid,
1105	target_ptr->process->pid, target_ptr->trdid, cycle );
1106	#endif
1107	// deschedule
1108	sched_yield( "killer thread wait joining thread" );
1109
1110	// block the target thread
1111	thread_block( target_xp , THREAD_BLOCKED_GLOBAL );
1112
1113	// set the REQ_DELETE flag in target thread descriptor
1114	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_REQ_DELETE );
1115
1116	// exit critical section
1117	hal_restore_irq( save_sr );
1118
1119	#if DEBUG_THREAD_DELETE
1120	cycle = (uint32_t)hal_get_cycles;
1121	if( DEBUG_THREAD_DELETE < cycle )
1122	printk("\n[%s] killer[%x,%x] exit / target[%x,%x] marked after join / cycle %d\n",
1123	__FUNCTION__, killer_ptr->process->pid, killer_ptr->trdid,
1124	target_ptr->process->pid, target_ptr->trdid, cycle );
1125	#endif
1126
1127	}
1128	}
1129	else // no synchronization with joining thread required
1130	{
1131	// block the target thread
1132	thread_block( target_xp , THREAD_BLOCKED_GLOBAL );
1133
1134	// set the REQ_DELETE flag in target thread descriptor
1135	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_REQ_DELETE );
1136
1137	#if DEBUG_THREAD_DELETE
1138	cycle = (uint32_t)hal_get_cycles;
1139	if( DEBUG_THREAD_DELETE < cycle )
1140	printk("\n[%s] killer[%x,%x] exit / target [%x,%x] marked / no join / cycle %d\n",
1141	__FUNCTION__, killer_ptr->process->pid, killer_ptr->trdid,
1142	target_ptr->process->pid, target_ptr->trdid, cycle );
1143	#endif
1144
1145	}
1146	} // end thread_delete()
1147
1148
1149
1150	/////////////////////////////
1151	void thread_idle_func( void )
1152	{
1153	while( 1 )
1154	{
1155	// unmask IRQs
1156	hal_enable_irq( NULL );
1157
1158	// force core to low-power mode (optional)
1159	if( CONFIG_SCHED_IDLE_MODE_SLEEP )
1160	{
1161
1162	#if DEBUG_THREAD_IDLE
1163	{
1164	uint32_t cycle = (uint32_t)hal_get_cycles();
1165	if( DEBUG_THREAD_IDLE < cycle )
1166	printk("\n[%s] idle thread on core[%x,%d] goes to sleep / cycle %d\n",
1167	__FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, cycle );
1168	}
1169	#endif
1170
1171	hal_core_sleep();
1172
1173	#if DEBUG_THREAD_IDLE
1174	{
1175	uint32_t cycle = (uint32_t)hal_get_cycles();
1176	if( DEBUG_THREAD_IDLE < cycle )
1177	printk("\n[%s] idle thread on core[%x,%d] wake up / cycle %d\n",
1178	__FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, cycle );
1179	}
1180	#endif
1181
1182	}
1183
1184	#if DEBUG_THREAD_IDLE
1185	{
1186	uint32_t cycle = (uint32_t)hal_get_cycles();
1187	if( DEBUG_THREAD_IDLE < cycle )
1188	sched_display( CURRENT_THREAD->core->lid );
1189	}
1190	#endif
1191	// search a runable thread
1192	sched_yield( "running idle thread" );
1193
1194	} // end while
1195
1196	} // end thread_idle()
1197
1198
1199	///////////////////////////////////////////
1200	void thread_time_update( thread_t * thread,
1201	bool_t is_user )
1202	{
1203	cycle_t current_cycle; // current cycle counter value
1204	cycle_t last_cycle; // last cycle counter value
1205
1206	// get pointer on thread_info structure
1207	thread_info_t * info = &thread->info;
1208
1209	// get last cycle counter value
1210	last_cycle = info->last_cycle;
1211
1212	// get current cycle counter value
1213	current_cycle = hal_get_cycles();
1214
1215	// update thread_info structure
1216	info->last_cycle = current_cycle;
1217
1218	// update time in thread_info
1219	if( is_user ) info->usr_cycles += (current_cycle - last_cycle);
1220	else info->sys_cycles += (current_cycle - last_cycle);
1221
1222	} // end thread_time_update()
1223
1224	/////////////////////////////////////
1225	xptr_t thread_get_xptr( pid_t pid,
1226	trdid_t trdid )
1227	{
1228	cxy_t target_cxy; // target thread cluster identifier
1229	ltid_t target_thread_ltid; // target thread local index
1230	thread_t * target_thread_ptr; // target thread local pointer
1231	xptr_t target_process_xp; // extended pointer on target process descriptor
1232	process_t * target_process_ptr; // local pointer on target process descriptor
1233	pid_t target_process_pid; // target process identifier
1234	xlist_entry_t root; // root of list of process in target cluster
1235	xptr_t lock_xp; // extended pointer on lock protecting this list
1236
1237	#if DEBUG_THREAD_GET_XPTR
1238	uint32_t cycle = (uint32_t)hal_get_cycles();
1239	thread_t * this = CURRENT_THREAD;
1240	if( DEBUG_THREAD_GET_XPTR < cycle )
1241	printk("\n[%s] thread %x in process %x enters / pid %x / trdid %x / cycle %d\n",
1242	__FUNCTION__, this->trdid, this->process->pid, pid, trdid, cycle );
1243	#endif
1244
1245	// get target cluster identifier and local thread identifier
1246	target_cxy = CXY_FROM_TRDID( trdid );
1247	target_thread_ltid = LTID_FROM_TRDID( trdid );
1248
1249	// check trdid argument
1250	if( (target_thread_ltid >= CONFIG_THREADS_MAX_PER_CLUSTER) \|\|
1251	cluster_is_undefined( target_cxy ) ) return XPTR_NULL;
1252
1253	// get root of list of process descriptors in target cluster
1254	hal_remote_memcpy( XPTR( local_cxy , &root ),
1255	XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ),
1256	sizeof(xlist_entry_t) );
1257
1258	// get extended pointer on lock protecting the list of local processes
1259	lock_xp = XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_lock );
1260
1261	// take the lock protecting the list of processes in target cluster
1262	remote_queuelock_acquire( lock_xp );
1263
1264	#if( DEBUG_THREAD_GET_XPTR & 1 )
1265	if( DEBUG_THREAD_GET_XPTR < cycle )
1266	printk("\n[%s] scan processes in cluster %x :\n", __FUNCTION__, target_cxy );
1267	#endif
1268
1269	// scan the list of local processes in target cluster
1270	xptr_t iter;
1271	bool_t found = false;
1272	XLIST_FOREACH( XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ) , iter )
1273	{
1274	target_process_xp = XLIST_ELEMENT( iter , process_t , local_list );
1275	target_process_ptr = GET_PTR( target_process_xp );
1276	target_process_pid = hal_remote_l32( XPTR( target_cxy , &target_process_ptr->pid ) );
1277
1278	#if( DEBUG_THREAD_GET_XPTR & 1 )
1279	if( DEBUG_THREAD_GET_XPTR < cycle )
1280	printk(" - process %x\n", target_process_pid );
1281	#endif
1282
1283	if( target_process_pid == pid )
1284	{
1285	found = true;
1286	break;
1287	}
1288	}
1289
1290	// release the lock protecting the list of processes in target cluster
1291	remote_queuelock_release( lock_xp );
1292
1293	// check PID found
1294	if( found == false )
1295	{
1296
1297	#if( DEBUG_THREAD_GET_XPTR & 1 )
1298	if( DEBUG_THREAD_GET_XPTR < cycle )
1299	printk("\n[%s] pid %x not found in cluster %x\n",
1300	__FUNCTION__, pid, target_cxy );
1301	#endif
1302	return XPTR_NULL;
1303	}
1304
1305	// get target thread local pointer
1306	xptr_t xp = XPTR( target_cxy , &target_process_ptr->th_tbl[target_thread_ltid] );
1307	target_thread_ptr = (thread_t *)hal_remote_lpt( xp );
1308
1309	if( target_thread_ptr == NULL )
1310	{
1311
1312	#if( DEBUG_THREAD_GET_XPTR & 1 )
1313	if( DEBUG_THREAD_GET_XPTR < cycle )
1314	printk("\n[%s] thread %x not registered in process %x in cluster %x\n",
1315	__FUNCTION__, trdid, pid, target_cxy );
1316	#endif
1317	return XPTR_NULL;
1318	}
1319
1320	#if DEBUG_THREAD_GET_XPTR
1321	cycle = (uint32_t)hal_get_cycles();
1322	if( DEBUG_THREAD_GET_XPTR < cycle )
1323	printk("\n[%s] thread %x in process %x exit / pid %x / trdid %x / cycle %d\n",
1324	__FUNCTION__, this->trdid, this->process->pid, pid, trdid, cycle );
1325	#endif
1326
1327	return XPTR( target_cxy , target_thread_ptr );
1328
1329	} // end thread_get_xptr()
1330
1331	///////////////////////////////////////////////////
1332	void thread_assert_can_yield( thread_t * thread,
1333	const char * func_str )
1334	{
1335	// does nothing if thread does not hold any busylock
1336
1337	if( thread->busylocks )
1338	{
1339	// get pointers on TXT0 chdev
1340	xptr_t txt0_xp = chdev_dir.txt_tx[0];
1341	cxy_t txt0_cxy = GET_CXY( txt0_xp );
1342	chdev_t * txt0_ptr = GET_PTR( txt0_xp );
1343
1344	// get extended pointer on TXT0 lock
1345	xptr_t txt0_lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
1346
1347	// get TXT0 lock
1348	remote_busylock_acquire( txt0_lock_xp );
1349
1350	// display error message on TXT0
1351	nolock_printk("\n[PANIC] in %s / thread[%x,%x] cannot yield : "
1352	"hold %d busylock(s) / cycle %d\n",
1353	func_str, thread->process->pid, thread->trdid,
1354	thread->busylocks, (uint32_t)hal_get_cycles() );
1355
1356	#if DEBUG_BUSYLOCK
1357
1358	// scan list of busylocks
1359	xptr_t iter_xp;
1360	xptr_t root_xp = XPTR( local_cxy , &thread->busylocks_root );
1361	XLIST_FOREACH( root_xp , iter_xp )
1362	{
1363	xptr_t lock_xp = XLIST_ELEMENT( iter_xp , busylock_t , xlist );
1364	cxy_t lock_cxy = GET_CXY( lock_xp );
1365	busylock_t * lock_ptr = GET_PTR( lock_xp );
1366	uint32_t lock_type = hal_remote_l32( XPTR( lock_cxy , &lock_ptr->type ) );
1367	nolock_printk(" - %s in cluster %x\n", lock_type_str[lock_type] , lock_cxy );
1368	}
1369
1370	#endif
1371
1372	// release TXT0 lock
1373	remote_busylock_release( txt0_lock_xp );
1374
1375	// suicide
1376	hal_core_sleep();
1377	}
1378	} // end thread_assert_can yield()
1379
1380	//////////////////////////////////////////////////
1381	void thread_display_busylocks( xptr_t thread_xp )
1382	{
1383	// get cluster and local pointer of target thread
1384	cxy_t thread_cxy = GET_CXY( thread_xp );
1385	thread_t * thread_ptr = GET_PTR( thread_xp );
1386
1387	#if( DEBUG_BUSYLOCK )
1388
1389	xptr_t iter_xp;
1390
1391	// get target thread TRDID and busylocks
1392	trdid_t trdid = hal_remote_l32(XPTR( thread_cxy , &thread_ptr->trdid ));
1393	uint32_t locks = hal_remote_l32(XPTR( thread_cxy , &thread_ptr->busylocks ));
1394
1395	// get target thread process and PID;
1396	process_t * process = hal_remote_lpt(XPTR( thread_cxy , &thread_ptr->process ));
1397	pid_t pid = hal_remote_l32(XPTR( thread_cxy , &process->pid ));
1398
1399	// get extended pointer on root of busylocks
1400	xptr_t root_xp = XPTR( thread_cxy , &thread_ptr->busylocks_root );
1401
1402	// get pointers on TXT0 chdev
1403	xptr_t txt0_xp = chdev_dir.txt_tx[0];
1404	cxy_t txt0_cxy = GET_CXY( txt0_xp );
1405	chdev_t * txt0_ptr = GET_PTR( txt0_xp );
1406
1407	// get extended pointer on remote TXT0 lock
1408	xptr_t txt0_lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
1409
1410	// get TXT0 lock
1411	remote_busylock_acquire( txt0_lock_xp );
1412
1413	// display header
1414	nolock_printk("\n***** thread %x in process %x : %d busylocks at cycle %d\n",
1415	trdid, pid, locks, (uint32_t)hal_get_cycles() );
1416
1417	// scan the xlist of busylocks when required
1418	if( locks )
1419	{
1420	XLIST_FOREACH( root_xp , iter_xp )
1421	{
1422	xptr_t lock_xp = XLIST_ELEMENT( iter_xp , busylock_t , xlist );
1423	cxy_t lock_cxy = GET_CXY( lock_xp );
1424	busylock_t * lock_ptr = GET_PTR( lock_xp );
1425	uint32_t lock_type = hal_remote_l32(XPTR( lock_cxy , &lock_ptr->type ));
1426	nolock_printk(" - %s in cluster %x\n", lock_type_str[lock_type] , lock_cxy );
1427	}
1428	}
1429
1430	// release TXT0 lock
1431	remote_busylock_release( txt0_lock_xp );
1432
1433	return;
1434
1435	#endif
1436
1437	// display a warning
1438	printk("\n[WARNING] set the DEBUG_BUSYLOCK parmeter in kernel_config.h"
1439	" to display busylocks for thread %x/%x\n", thread_cxy, thread_ptr );
1440
1441	} // end thread_display_busylock()
1442

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