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source: trunk/kernel/kern/thread.c @ 441

Last change on this file since 441 was 440, checked in by alain, 7 years ago
1/ Fix a bug in the Multithreaded "sort" applicationr: The pthread_create() arguments must be declared as global variables. 2/ The exit syscall can be called by any thread of a process..
File size: 41.6 KB

Rev	Line
[1]	1	/*
	2	* thread.c - implementation of thread operations (user & kernel)
[171]	3	*
[1]	4	* Author Ghassan Almaless (2008,2009,2010,2011,2012)
[23]	5	* Alain Greiner (2016,2017)
[1]	6	*
	7	* Copyright (c) UPMC Sorbonne Universites
	8	*
[5]	9	* This file is part of ALMOS-MKH.
[1]	10	*
[5]	11	* ALMOS-MKH is free software; you can redistribute it and/or modify it
[1]	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	*
[5]	15	* ALMOS-MKH is distributed in the hope that it will be useful, but
[1]	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
[5]	21	* along with ALMOS-MKH; if not, write to the Free Software Foundation,
[1]	22	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	23	*/
	24
[14]	25	#include <kernel_config.h>
[1]	26	#include <hal_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>
[188]	36	#include <dev_pic.h>
[1]	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
	45	//////////////////////////////////////////////////////////////////////////////////////
	46	// Extern global variables
	47	//////////////////////////////////////////////////////////////////////////////////////
	48
	49	extern process_t process_zero;
	50
	51	//////////////////////////////////////////////////////////////////////////////////////
[16]	52	// This function returns a printable string for the thread type.
[1]	53	//////////////////////////////////////////////////////////////////////////////////////
[5]	54	char * thread_type_str( uint32_t type )
	55	{
[296]	56	if ( type == THREAD_USER ) return "USR";
[16]	57	else if( type == THREAD_RPC ) return "RPC";
	58	else if( type == THREAD_DEV ) return "DEV";
[296]	59	else if( type == THREAD_IDLE ) return "IDL";
[5]	60	else return "undefined";
	61	}
	62
[1]	63	/////////////////////////////////////////////////////////////////////////////////////
[14]	64	// This static function allocates physical memory for a thread descriptor.
	65	// It can be called by the three functions:
[1]	66	// - thread_user_create()
[14]	67	// - thread_user_fork()
[1]	68	// - thread_kernel_create()
	69	/////////////////////////////////////////////////////////////////////////////////////
[14]	70	// @ return pointer on thread descriptor if success / return NULL if failure.
[1]	71	/////////////////////////////////////////////////////////////////////////////////////
[14]	72	static thread_t * thread_alloc()
[1]	73	{
[23]	74	page_t * page; // pointer on page descriptor containing thread descriptor
[171]	75	kmem_req_t req; // kmem request
[1]	76
	77	// allocates memory for thread descriptor + kernel stack
	78	req.type = KMEM_PAGE;
[14]	79	req.size = CONFIG_THREAD_DESC_ORDER;
[1]	80	req.flags = AF_KERNEL \| AF_ZERO;
	81	page = kmem_alloc( &req );
	82
[23]	83	if( page == NULL ) return NULL;
[1]	84
[315]	85	// return pointer on new thread descriptor
	86	xptr_t base_xp = ppm_page2base( XPTR(local_cxy , page ) );
	87	return (thread_t *)GET_PTR( base_xp );
	88
	89	} // end thread_alloc()
	90
	91
[14]	92	/////////////////////////////////////////////////////////////////////////////////////
[23]	93	// This static function releases the physical memory for a thread descriptor.
[53]	94	// It is called by the three functions:
[23]	95	// - thread_user_create()
	96	// - thread_user_fork()
	97	// - thread_kernel_create()
	98	/////////////////////////////////////////////////////////////////////////////////////
	99	// @ thread : pointer on thread descriptor.
	100	/////////////////////////////////////////////////////////////////////////////////////
	101	static void thread_release( thread_t * thread )
	102	{
	103	kmem_req_t req;
	104
[315]	105	xptr_t base_xp = ppm_base2page( XPTR(local_cxy , thread ) );
	106
[23]	107	req.type = KMEM_PAGE;
[315]	108	req.ptr = GET_PTR( base_xp );
[23]	109	kmem_free( &req );
	110	}
	111
	112	/////////////////////////////////////////////////////////////////////////////////////
[14]	113	// This static function initializes a thread descriptor (kernel or user).
[438]	114	// It can be called by the four functions:
[14]	115	// - thread_user_create()
	116	// - thread_user_fork()
	117	// - thread_kernel_create()
[438]	118	// - thread_idle_init()
	119	// It updates the local DQDT.
[14]	120	/////////////////////////////////////////////////////////////////////////////////////
	121	// @ thread : pointer on thread descriptor
	122	// @ process : pointer on process descriptor.
	123	// @ type : thread type.
	124	// @ func : pointer on thread entry function.
	125	// @ args : pointer on thread entry function arguments.
	126	// @ core_lid : target core local index.
	127	// @ u_stack_base : stack base (user thread only)
	128	// @ u_stack_size : stack base (user thread only)
	129	/////////////////////////////////////////////////////////////////////////////////////
	130	static error_t thread_init( thread_t * thread,
	131	process_t * process,
	132	thread_type_t type,
	133	void * func,
	134	void * args,
	135	lid_t core_lid,
	136	intptr_t u_stack_base,
	137	uint32_t u_stack_size )
	138	{
	139	error_t error;
	140	trdid_t trdid; // allocated thread identifier
	141
	142	cluster_t * local_cluster = LOCAL_CLUSTER;
	143
	144	// register new thread in process descriptor, and get a TRDID
[1]	145	error = process_register_thread( process, thread , &trdid );
	146
[171]	147	if( error )
[1]	148	{
[14]	149	printk("\n[ERROR] in %s : cannot get TRDID\n", __FUNCTION__ );
	150	return EINVAL;
[1]	151	}
[14]	152
[407]	153	// compute thread descriptor size without kernel stack
	154	uint32_t desc_size = (intptr_t)(&thread->signature) - (intptr_t)thread + 4;
	155
[1]	156	// Initialize new thread descriptor
	157	thread->trdid = trdid;
[171]	158	thread->type = type;
[1]	159	thread->quantum = 0; // TODO
	160	thread->ticks_nr = 0; // TODO
	161	thread->time_last_check = 0;
	162	thread->core = &local_cluster->core_tbl[core_lid];
	163	thread->process = process;
	164
	165	thread->local_locks = 0;
[409]	166	thread->remote_locks = 0;
[1]	167
[409]	168	#if CONFIG_LOCKS_DEBUG
	169	list_root_init( &thread->locks_root );
[1]	170	xlist_root_init( XPTR( local_cxy , &thread->xlocks_root ) );
[409]	171	#endif
[1]	172
[171]	173	thread->u_stack_base = u_stack_base;
[1]	174	thread->u_stack_size = u_stack_size;
[407]	175	thread->k_stack_base = (intptr_t)thread + desc_size;
	176	thread->k_stack_size = CONFIG_THREAD_DESC_SIZE - desc_size;
[1]	177
	178	thread->entry_func = func; // thread entry point
	179	thread->entry_args = args; // thread function arguments
[171]	180	thread->flags = 0; // all flags reset
[1]	181	thread->errno = 0; // no error detected
[407]	182	thread->fork_user = 0; // no user defined placement for fork
	183	thread->fork_cxy = 0; // user defined target cluster for fork
[409]	184	thread->blocked = THREAD_BLOCKED_GLOBAL;
[1]	185
[440]	186	// reset sched list
[1]	187	list_entry_init( &thread->sched_list );
	188
	189	// reset thread info
	190	memset( &thread->info , 0 , sizeof(thread_info_t) );
	191
[409]	192	// initializes join_lock
	193	remote_spinlock_init( XPTR( local_cxy , &thread->join_lock ) );
	194
[1]	195	// initialise signature
	196	thread->signature = THREAD_SIGNATURE;
	197
[408]	198	// FIXME call hal_thread_init() function to initialise the save_sr field
	199	thread->save_sr = 0xFF13;
	200
[171]	201	// register new thread in core scheduler
[1]	202	sched_register_thread( thread->core , thread );
	203
[438]	204	// update DQDT
	205	dqdt_update_threads( 1 );
	206
[1]	207	return 0;
	208
[296]	209	} // end thread_init()
	210
[1]	211	/////////////////////////////////////////////////////////
[23]	212	error_t thread_user_create( pid_t pid,
	213	void * start_func,
	214	void * start_arg,
[1]	215	pthread_attr_t * attr,
[23]	216	thread_t ** new_thread )
[1]	217	{
	218	error_t error;
	219	thread_t * thread; // pointer on created thread descriptor
	220	process_t * process; // pointer to local process descriptor
	221	lid_t core_lid; // selected core local index
[23]	222	vseg_t * vseg; // stack vseg
[1]	223
[407]	224	assert( (attr != NULL) , __FUNCTION__, "pthread attributes must be defined" );
[5]	225
[438]	226	#if DEBUG_THREAD_USER_CREATE
[433]	227	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	228	if( DEBUG_THREAD_USER_CREATE < cycle )
[433]	229	printk("\n[DBG] %s : thread %x enter / process %x / cycle %d\n",
	230	__FUNCTION__, CURRENT_THREAD, pid , cycle );
	231	#endif
[428]	232
[23]	233	// get process descriptor local copy
	234	process = process_get_local_copy( pid );
[440]	235
[23]	236	if( process == NULL )
	237	{
	238	printk("\n[ERROR] in %s : cannot get process descriptor %x\n",
	239	__FUNCTION__ , pid );
	240	return ENOMEM;
	241	}
	242
[171]	243	// select a target core in local cluster
[407]	244	if( attr->attributes & PT_ATTR_CORE_DEFINED )
[23]	245	{
[407]	246	core_lid = attr->lid;
	247	if( core_lid >= LOCAL_CLUSTER->cores_nr )
	248	{
	249	printk("\n[ERROR] in %s : illegal core index attribute = %d\n",
	250	__FUNCTION__ , core_lid );
	251	return EINVAL;
	252	}
[23]	253	}
[407]	254	else
	255	{
	256	core_lid = cluster_select_local_core();
	257	}
[1]	258
[171]	259	// allocate a stack from local VMM
[407]	260	vseg = vmm_create_vseg( process,
	261	VSEG_TYPE_STACK,
	262	0, // size unused
	263	0, // length unused
	264	0, // file_offset unused
	265	0, // file_size unused
	266	XPTR_NULL, // mapper_xp unused
	267	local_cxy );
[1]	268
[170]	269	if( vseg == NULL )
[23]	270	{
	271	printk("\n[ERROR] in %s : cannot create stack vseg\n", __FUNCTION__ );
	272	return ENOMEM;
[171]	273	}
[23]	274
[171]	275	// allocate memory for thread descriptor
[14]	276	thread = thread_alloc();
[1]	277
[23]	278	if( thread == NULL )
	279	{
	280	printk("\n[ERROR] in %s : cannot create new thread\n", __FUNCTION__ );
	281	vmm_remove_vseg( vseg );
	282	return ENOMEM;
	283	}
[14]	284
[171]	285	// initialize thread descriptor
[14]	286	error = thread_init( thread,
	287	process,
	288	THREAD_USER,
[23]	289	start_func,
	290	start_arg,
[14]	291	core_lid,
[23]	292	vseg->min,
	293	vseg->max - vseg->min );
[171]	294	if( error )
[14]	295	{
[23]	296	printk("\n[ERROR] in %s : cannot initialize new thread\n", __FUNCTION__ );
	297	vmm_remove_vseg( vseg );
	298	thread_release( thread );
[14]	299	return EINVAL;
	300	}
	301
	302	// set DETACHED flag if required
[407]	303	if( attr->attributes & PT_ATTR_DETACH )
	304	{
	305	thread->flags \|= THREAD_FLAG_DETACHED;
	306	}
[1]	307
[171]	308	// allocate & initialize CPU context
[407]	309	if( hal_cpu_context_create( thread ) )
[23]	310	{
	311	printk("\n[ERROR] in %s : cannot create CPU context\n", __FUNCTION__ );
	312	vmm_remove_vseg( vseg );
	313	thread_release( thread );
	314	return ENOMEM;
	315	}
	316
[407]	317	// allocate FPU context
	318	if( hal_fpu_context_alloc( thread ) )
[23]	319	{
	320	printk("\n[ERROR] in %s : cannot create FPU context\n", __FUNCTION__ );
	321	vmm_remove_vseg( vseg );
	322	thread_release( thread );
	323	return ENOMEM;
	324	}
	325
[438]	326	#if DEBUG_THREAD_USER_CREATE
[433]	327	cycle = (uint32_t)hal_get_cycles();
[438]	328	if( DEBUG_THREAD_USER_CREATE < cycle )
[433]	329	printk("\n[DBG] %s : thread %x exit / process %x / new_thread %x / core %d / cycle %d\n",
	330	__FUNCTION__, CURRENT_THREAD, pid, thread, core_lid, cycle );
	331	#endif
[1]	332
	333	*new_thread = thread;
	334	return 0;
[14]	335
[296]	336	} // end thread_user_create()
	337
[408]	338	///////////////////////////////////////////////////////
	339	error_t thread_user_fork( xptr_t parent_thread_xp,
	340	process_t * child_process,
	341	thread_t ** child_thread )
[1]	342	{
	343	error_t error;
[408]	344	thread_t * child_ptr; // local pointer on local child thread
	345	lid_t core_lid; // selected core local index
[1]	346
[408]	347	thread_t * parent_ptr; // local pointer on remote parent thread
	348	cxy_t parent_cxy; // parent thread cluster
	349	process_t * parent_process; // local pointer on parent process
	350	xptr_t parent_gpt_xp; // extended pointer on parent thread GPT
[5]	351
[408]	352	void * func; // parent thread entry_func
	353	void * args; // parent thread entry_args
	354	intptr_t base; // parent thread u_stack_base
	355	uint32_t size; // parent thread u_stack_size
	356	uint32_t flags; // parent_thread flags
	357	vpn_t vpn_base; // parent thread stack vpn_base
	358	vpn_t vpn_size; // parent thread stack vpn_size
	359	reg_t * uzone; // parent thread pointer on uzone
	360
	361	vseg_t * vseg; // child thread STACK vseg
	362
[438]	363	#if DEBUG_THREAD_USER_FORK
[433]	364	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	365	if( DEBUG_THREAD_USER_FORK < cycle )
[433]	366	printk("\n[DBG] %s : thread %x enter / child_process %x / cycle %d\n",
	367	__FUNCTION__, CURRENT_THREAD, child_process->pid, cycle );
	368	#endif
[408]	369
[1]	370	// select a target core in local cluster
	371	core_lid = cluster_select_local_core();
	372
[408]	373	// get cluster and local pointer on parent thread descriptor
	374	parent_cxy = GET_CXY( parent_thread_xp );
	375	parent_ptr = (thread_t *)GET_PTR( parent_thread_xp );
[1]	376
[408]	377	// get relevant fields from parent thread
[428]	378	func = (void *) hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->entry_func ));
	379	args = (void *) hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->entry_args ));
	380	base = (intptr_t)hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->u_stack_base ));
	381	size = (uint32_t)hal_remote_lw ( XPTR( parent_cxy , &parent_ptr->u_stack_size ));
	382	flags = hal_remote_lw ( XPTR( parent_cxy , &parent_ptr->flags ));
	383	uzone = (reg_t *) hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->uzone_current ));
[1]	384
[408]	385	vpn_base = base >> CONFIG_PPM_PAGE_SHIFT;
	386	vpn_size = size >> CONFIG_PPM_PAGE_SHIFT;
	387
	388	// get pointer on parent process in parent thread cluster
	389	parent_process = (process_t *)hal_remote_lpt( XPTR( parent_cxy,
	390	&parent_ptr->process ) );
	391
	392	// get extended pointer on parent GPT in parent thread cluster
	393	parent_gpt_xp = XPTR( parent_cxy , &parent_process->vmm.gpt );
	394
	395	// allocate memory for child thread descriptor
	396	child_ptr = thread_alloc();
	397	if( child_ptr == NULL )
[23]	398	{
	399	printk("\n[ERROR] in %s : cannot allocate new thread\n", __FUNCTION__ );
[408]	400	return -1;
[23]	401	}
[14]	402
[171]	403	// initialize thread descriptor
[408]	404	error = thread_init( child_ptr,
	405	child_process,
[14]	406	THREAD_USER,
[408]	407	func,
	408	args,
[14]	409	core_lid,
[408]	410	base,
	411	size );
[23]	412	if( error )
[14]	413	{
[408]	414	printk("\n[ERROR] in %s : cannot initialize child thread\n", __FUNCTION__ );
	415	thread_release( child_ptr );
[14]	416	return EINVAL;
	417	}
	418
[407]	419	// return child pointer
[408]	420	*child_thread = child_ptr;
[1]	421
[408]	422	// set detached flag if required
	423	if( flags & THREAD_FLAG_DETACHED ) child_ptr->flags = THREAD_FLAG_DETACHED;
[1]	424
[408]	425	// update uzone pointer in child thread descriptor
[428]	426	child_ptr->uzone_current = (char *)((intptr_t)uzone +
	427	(intptr_t)child_ptr -
	428	(intptr_t)parent_ptr );
[408]	429
	430
[407]	431	// allocate CPU context for child thread
[408]	432	if( hal_cpu_context_alloc( child_ptr ) )
[23]	433	{
[407]	434	printk("\n[ERROR] in %s : cannot allocate CPU context\n", __FUNCTION__ );
[408]	435	thread_release( child_ptr );
	436	return -1;
[23]	437	}
	438
[407]	439	// allocate FPU context for child thread
[408]	440	if( hal_fpu_context_alloc( child_ptr ) )
[23]	441	{
[407]	442	printk("\n[ERROR] in %s : cannot allocate FPU context\n", __FUNCTION__ );
[408]	443	thread_release( child_ptr );
	444	return -1;
[23]	445	}
	446
[408]	447	// create and initialize STACK vseg
	448	vseg = vseg_alloc();
	449	vseg_init( vseg,
	450	VSEG_TYPE_STACK,
	451	base,
	452	size,
	453	vpn_base,
	454	vpn_size,
	455	0, 0, XPTR_NULL, // not a file vseg
	456	local_cxy );
[1]	457
[408]	458	// register STACK vseg in local child VSL
	459	vseg_attach( &child_process->vmm , vseg );
	460
	461	// copy all valid STACK GPT entries
	462	vpn_t vpn;
	463	bool_t mapped;
	464	ppn_t ppn;
	465	for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ )
	466	{
	467	error = hal_gpt_pte_copy( &child_process->vmm.gpt,
	468	parent_gpt_xp,
	469	vpn,
	470	true, // set cow
	471	&ppn,
	472	&mapped );
	473	if( error )
	474	{
	475	vseg_detach( &child_process->vmm , vseg );
	476	vseg_free( vseg );
	477	thread_release( child_ptr );
	478	printk("\n[ERROR] in %s : cannot update child GPT\n", __FUNCTION__ );
	479	return -1;
	480	}
	481
[433]	482	// increment pending forks counter for the page if mapped
[408]	483	if( mapped )
	484	{
	485	xptr_t page_xp = ppm_ppn2page( ppn );
	486	cxy_t page_cxy = GET_CXY( page_xp );
	487	page_t * page_ptr = (page_t *)GET_PTR( page_xp );
[433]	488	hal_remote_atomic_add( XPTR( page_cxy , &page_ptr->forks ) , 1 );
[408]	489
[438]	490	#if (DEBUG_THREAD_USER_FORK & 1)
[433]	491	cycle = (uint32_t)hal_get_cycles();
[438]	492	if( DEBUG_THREAD_USER_FORK < cycle )
[433]	493	printk("\n[DBG] %s : thread %x copied stack PTE to child GPT : vpn %x\n",
	494	__FUNCTION__, CURRENT_THREAD, vpn );
	495	#endif
[408]	496
	497	}
	498	}
	499
[433]	500	// set COW flag for all mapped entries of STAK vseg in parent thread GPT
	501	hal_gpt_set_cow( parent_gpt_xp,
	502	vpn_base,
	503	vpn_size );
[408]	504
[438]	505	#if DEBUG_THREAD_USER_FORK
[433]	506	cycle = (uint32_t)hal_get_cycles();
[438]	507	if( DEBUG_THREAD_USER_FORK < cycle )
[433]	508	printk("\n[DBG] %s : thread %x exit / child_process %x / child_thread %x / cycle %d\n",
	509	__FUNCTION__, CURRENT_THREAD, child_process->pid, child_ptr, cycle );
	510	#endif
[407]	511
[1]	512	return 0;
[5]	513
[296]	514	} // end thread_user_fork()
	515
[1]	516	/////////////////////////////////////////////////////////
	517	error_t thread_kernel_create( thread_t ** new_thread,
	518	thread_type_t type,
[171]	519	void * func,
	520	void * args,
[1]	521	lid_t core_lid )
	522	{
	523	error_t error;
[14]	524	thread_t * thread; // pointer on new thread descriptor
[1]	525
[407]	526	assert( ( (type == THREAD_IDLE) \|\| (type == THREAD_RPC) \|\| (type == THREAD_DEV) ) ,
	527	__FUNCTION__ , "illegal thread type" );
[1]	528
[171]	529	assert( (core_lid < LOCAL_CLUSTER->cores_nr) ,
[5]	530	__FUNCTION__ , "illegal core_lid" );
[1]	531
[438]	532	#if DEBUG_THREAD_KERNEL_CREATE
[433]	533	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	534	if( DEBUG_THREAD_KERNEL_CREATE < cycle )
[433]	535	printk("\n[DBG] %s : thread %x enter / requested_type %s / cycle %d\n",
	536	__FUNCTION__, CURRENT_THREAD, thread, thread_type_str(type), cycle );
	537	#endif
	538
[171]	539	// allocate memory for new thread descriptor
[14]	540	thread = thread_alloc();
	541
	542	if( thread == NULL ) return ENOMEM;
	543
[171]	544	// initialize thread descriptor
[14]	545	error = thread_init( thread,
	546	&process_zero,
	547	type,
	548	func,
	549	args,
	550	core_lid,
	551	0 , 0 ); // no user stack for a kernel thread
	552
[171]	553	if( error ) // release allocated memory for thread descriptor
[1]	554	{
[185]	555	thread_release( thread );
[14]	556	return EINVAL;
[1]	557	}
	558
[171]	559	// allocate & initialize CPU context
	560	hal_cpu_context_create( thread );
[14]	561
[438]	562	#if DEBUG_THREAD_KERNEL_CREATE
[433]	563	cycle = (uint32_t)hal_get_cycles();
[438]	564	if( DEBUG_THREAD_KERNEL_CREATE < cycle )
[433]	565	printk("\n[DBG] %s : thread %x exit / new_thread %x / type %s / cycle %d\n",
	566	__FUNCTION__, CURRENT_THREAD, thread, thread_type_str(type), cycle );
	567	#endif
[1]	568
[171]	569	*new_thread = thread;
[1]	570	return 0;
[5]	571
[296]	572	} // end thread_kernel_create()
	573
[438]	574	/////////////////////////////////////////////////
	575	error_t thread_idle_init( thread_t * thread,
	576	thread_type_t type,
	577	void * func,
	578	void * args,
	579	lid_t core_lid )
[14]	580	{
[407]	581	assert( (type == THREAD_IDLE) , __FUNCTION__ , "illegal thread type" );
[1]	582
[407]	583	assert( (core_lid < LOCAL_CLUSTER->cores_nr) , __FUNCTION__ , "illegal core index" );
[14]	584
	585	error_t error = thread_init( thread,
	586	&process_zero,
	587	type,
	588	func,
	589	args,
	590	core_lid,
	591	0 , 0 ); // no user stack for a kernel thread
	592
	593	// allocate & initialize CPU context if success
	594	if( error == 0 ) hal_cpu_context_create( thread );
[171]	595
[14]	596	return error;
	597
[438]	598	} // end thread_idle_init()
[407]	599
[1]	600	///////////////////////////////////////////////////////////////////////////////////////
	601	// TODO: check that all memory dynamically allocated during thread execution
[440]	602	// has been released, using a cache of mmap requests. [AG]
[1]	603	///////////////////////////////////////////////////////////////////////////////////////
	604	void thread_destroy( thread_t * thread )
	605	{
[409]	606	reg_t save_sr;
[1]	607
	608	process_t * process = thread->process;
	609	core_t * core = thread->core;
	610
[438]	611	#if DEBUG_THREAD_DESTROY
[433]	612	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	613	if( DEBUG_THREAD_DESTROY < cycle )
[433]	614	printk("\n[DBG] %s : thread %x enter to destroy thread %x in process %x / cycle %d\n",
	615	__FUNCTION__, CURRENT_THREAD, thread, process->pid, cycle );
	616	#endif
[1]	617
[5]	618	assert( (thread->local_locks == 0) , __FUNCTION__ , "all local locks not released" );
[171]	619
[5]	620	assert( (thread->remote_locks == 0) , __FUNCTION__ , "all remote locks not released" );
	621
[1]	622	// update intrumentation values
[408]	623	process->vmm.pgfault_nr += thread->info.pgfault_nr;
[1]	624
	625	// release memory allocated for CPU context and FPU context
	626	hal_cpu_context_destroy( thread );
[409]	627	if ( thread->type == THREAD_USER ) hal_fpu_context_destroy( thread );
[1]	628
[428]	629	// release FPU ownership if required
[409]	630	hal_disable_irq( &save_sr );
[1]	631	if( core->fpu_owner == thread )
	632	{
	633	core->fpu_owner = NULL;
	634	hal_fpu_disable();
	635	}
[409]	636	hal_restore_irq( save_sr );
[1]	637
[171]	638	// remove thread from process th_tbl[]
[428]	639	process_remove_thread( thread );
[1]	640
[438]	641	// update DQDT
	642	dqdt_update_threads( -1 );
[23]	643
[1]	644	// invalidate thread descriptor
	645	thread->signature = 0;
	646
	647	// release memory for thread descriptor
[23]	648	thread_release( thread );
[1]	649
[438]	650	#if DEBUG_THREAD_DESTROY
[433]	651	cycle = (uint32_t)hal_get_cycles();
[438]	652	if( DEBUG_THREAD_DESTROY < cycle )
[433]	653	printk("\n[DBG] %s : thread %x exit / destroyed thread %x in process %x / cycle %d\n",
	654	__FUNCTION__, CURRENT_THREAD, thread, process->pid, cycle );
	655	#endif
[1]	656
[407]	657	} // end thread_destroy()
	658
[416]	659	//////////////////////////////////////////////////
	660	inline void thread_set_req_ack( thread_t * target,
	661	uint32_t * rsp_count )
[1]	662	{
[409]	663	reg_t save_sr; // for critical section
	664
[416]	665	// get pointer on target thread scheduler
	666	scheduler_t * sched = &target->core->scheduler;
[409]	667
[416]	668	// wait scheduler ready to handle a new request
	669	while( sched->req_ack_pending ) asm volatile( "nop" );
[409]	670
	671	// enter critical section
	672	hal_disable_irq( &save_sr );
	673
[416]	674	// set request in target thread scheduler
	675	sched->req_ack_pending = true;
[409]	676
[416]	677	// set ack request in target thread "flags"
	678	hal_atomic_or( &target->flags , THREAD_FLAG_REQ_ACK );
[409]	679
[416]	680	// set pointer on responses counter in target thread
	681	target->ack_rsp_count = rsp_count;
[409]	682
	683	// exit critical section
	684	hal_restore_irq( save_sr );
	685
[407]	686	hal_fence();
[171]	687
[416]	688	} // thread_set_req_ack()
[409]	689
[416]	690	/////////////////////////////////////////////////////
	691	inline void thread_reset_req_ack( thread_t * target )
[1]	692	{
[409]	693	reg_t save_sr; // for critical section
	694
	695	// get pointer on target thread scheduler
[416]	696	scheduler_t * sched = &target->core->scheduler;
[409]	697
	698	// check signal pending in scheduler
[416]	699	assert( sched->req_ack_pending , __FUNCTION__ , "no pending signal" );
[409]	700
	701	// enter critical section
	702	hal_disable_irq( &save_sr );
	703
	704	// reset signal in scheduler
[416]	705	sched->req_ack_pending = false;
[409]	706
	707	// reset signal in thread "flags"
[416]	708	hal_atomic_and( &target->flags , ~THREAD_FLAG_REQ_ACK );
[409]	709
	710	// reset pointer on responses counter
[416]	711	target->ack_rsp_count = NULL;
[409]	712
	713	// exit critical section
	714	hal_restore_irq( save_sr );
	715
[407]	716	hal_fence();
[171]	717
[416]	718	} // thread_reset_req_ack()
[409]	719
[1]	720	////////////////////////////////
	721	inline bool_t thread_can_yield()
	722	{
	723	thread_t * this = CURRENT_THREAD;
[367]	724	return (this->local_locks == 0) && (this->remote_locks == 0);
[1]	725	}
	726
[367]	727	/////////////////////////
	728	void thread_check_sched()
[1]	729	{
[338]	730	thread_t * this = CURRENT_THREAD;
[1]	731
[367]	732	if( (this->local_locks == 0) &&
	733	(this->remote_locks == 0) &&
	734	(this->flags & THREAD_FLAG_SCHED) )
	735	{
	736	this->flags &= ~THREAD_FLAG_SCHED;
[408]	737	sched_yield( "delayed scheduling" );
[367]	738	}
[1]	739
[407]	740	} // end thread_check_sched()
	741
[436]	742	//////////////////////////////////////
	743	void thread_block( xptr_t thread_xp,
	744	uint32_t cause )
[407]	745	{
[436]	746	// get thread cluster and local pointer
	747	cxy_t cxy = GET_CXY( thread_xp );
	748	thread_t * ptr = GET_PTR( thread_xp );
	749
[407]	750	// set blocking cause
[436]	751	hal_remote_atomic_or( XPTR( cxy , &ptr->blocked ) , cause );
[407]	752	hal_fence();
	753
[438]	754	#if DEBUG_THREAD_BLOCK
[433]	755	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	756	if( DEBUG_THREAD_BLOCK < cycle )
[436]	757	printk("\n[DBG] %s : thread %x blocked thread %x / cause %x / cycle %d\n",
	758	__FUNCTION__ , CURRENT_THREAD , ptr , cause , cycle );
[433]	759	#endif
	760
[438]	761	#if (DEBUG_THREAD_BLOCK & 1)
	762	if( DEBUG_THREAD_BLOCK < cycle )
[436]	763	sched_display( ptr->core->lid );
	764	#endif
	765
[407]	766	} // end thread_block()
	767
[433]	768	////////////////////////////////////////////
	769	uint32_t thread_unblock( xptr_t thread_xp,
[407]	770	uint32_t cause )
	771	{
	772	// get thread cluster and local pointer
[433]	773	cxy_t cxy = GET_CXY( thread_xp );
	774	thread_t * ptr = GET_PTR( thread_xp );
[407]	775
	776	// reset blocking cause
	777	uint32_t previous = hal_remote_atomic_and( XPTR( cxy , &ptr->blocked ) , ~cause );
	778	hal_fence();
	779
[438]	780	#if DEBUG_THREAD_BLOCK
[433]	781	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	782	if( DEBUG_THREAD_BLOCK < cycle )
[436]	783	printk("\n[DBG] %s : thread %x unblocked thread %x / cause %x / cycle %d\n",
	784	__FUNCTION__ , CURRENT_THREAD , ptr , cause , cycle );
[433]	785	#endif
	786
[438]	787	#if (DEBUG_THREAD_BLOCK & 1)
	788	if( DEBUG_THREAD_BLOCK < cycle )
[436]	789	sched_display( ptr->core->lid );
	790	#endif
	791
[407]	792	// return a non zero value if the cause bit is modified
	793	return( previous & cause );
	794
	795	} // end thread_unblock()
	796
[440]	797	/*
	798
[436]	799	////////////////////////////////////
	800	void thread_kill( xptr_t target_xp,
	801	bool_t is_exit,
	802	bool_t is_forced )
[1]	803	{
[436]	804	reg_t save_sr; // for critical section
	805	bool_t attached; // target thread in attached mode
	806	bool_t join_done; // joining thread arrived first
	807	xptr_t killer_xp; // extended pointer on killer thread (this)
	808	thread_t * killer_ptr; // pointer on killer thread (this)
	809	cxy_t target_cxy; // target thread cluster
	810	thread_t * target_ptr; // pointer on target thread
	811	xptr_t joining_xp; // extended pointer on joining thread
	812	thread_t * joining_ptr; // pointer on joining thread
	813	cxy_t joining_cxy; // joining thread cluster
	814	pid_t target_pid; // target process PID
	815	cxy_t owner_cxy; // target process owner cluster
	816	trdid_t target_trdid; // target thread identifier
	817	ltid_t target_ltid; // target thread local index
	818	xptr_t process_state_xp; // extended pointer on <term_state> in process
[1]	819
[436]	820	xptr_t target_flags_xp; // extended pointer on target thread <flags>
	821	xptr_t target_join_lock_xp; // extended pointer on target thread <join_lock>
	822	xptr_t target_join_xp_xp; // extended pointer on target thread <join_xp>
	823	xptr_t target_process_xp; // extended pointer on target thread <process>
[1]	824
[436]	825	process_t * target_process; // pointer on target thread process
	826
[440]	827	// get target thread pointer and cluster
[436]	828	target_cxy = GET_CXY( target_xp );
	829	target_ptr = GET_PTR( target_xp );
	830
	831	// get killer thread pointers
	832	killer_ptr = CURRENT_THREAD;
	833	killer_xp = XPTR( local_cxy , killer_ptr );
	834
[440]	835	#if DEBUG_THREAD_DELETE
[433]	836	uint32_t cycle = (uint32_t)hal_get_cycles;
[440]	837	if( DEBUG_THREAD_DELETE < cycle )
[433]	838	printk("\n[DBG] %s : thread %x enter for target thread %x / cycle %d\n",
[436]	839	__FUNCTION__, killer_ptr, target_ptr, cycle );
[433]	840	#endif
[1]	841
[436]	842	// block the target thread
	843	thread_block( target_xp , THREAD_BLOCKED_GLOBAL );
[409]	844
[436]	845	// get target thread attached mode
	846	target_flags_xp = XPTR( target_cxy , &target_ptr->flags );
	847	attached = ((hal_remote_lw( target_flags_xp ) & THREAD_FLAG_DETACHED) == 0);
	848
	849	// synchronize with the joining thread
	850	// if the target thread is attached && not forced
	851
	852	if( attached && (is_forced == false) )
[1]	853	{
[436]	854	// build extended pointers on target thread join fields
	855	target_join_lock_xp = XPTR( target_cxy , &target_ptr->join_lock );
	856	target_join_xp_xp = XPTR( target_cxy , &target_ptr->join_xp );
[409]	857
[436]	858	// enter critical section
	859	hal_disable_irq( &save_sr );
[409]	860
[436]	861	// take the join_lock in target thread descriptor
	862	remote_spinlock_lock( target_join_lock_xp );
	863
	864	// get join_done from target thread descriptor
	865	join_done = ((hal_remote_lw( target_flags_xp ) & THREAD_FLAG_JOIN_DONE) != 0);
	866
	867	if( join_done ) // joining thread arrived first
[409]	868	{
[436]	869	// get extended pointer on joining thread
	870	joining_xp = (xptr_t)hal_remote_lwd( target_join_xp_xp );
	871	joining_ptr = GET_PTR( joining_xp );
	872	joining_cxy = GET_CXY( joining_xp );
	873
	874	// reset the join_done flag in target thread
	875	hal_remote_atomic_and( target_flags_xp , ~THREAD_FLAG_JOIN_DONE );
[409]	876
[436]	877	// unblock the joining thread
	878	thread_unblock( joining_xp , THREAD_BLOCKED_JOIN );
	879
	880	// release the join_lock in target thread descriptor
	881	remote_spinlock_unlock( target_join_lock_xp );
	882
	883	// restore IRQs
	884	hal_restore_irq( save_sr );
[409]	885	}
[436]	886	else // this thread arrived first
	887	{
	888	// set the kill_done flag in target thread
	889	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_KILL_DONE );
[1]	890
[436]	891	// block this thread on BLOCKED_JOIN
	892	thread_block( killer_xp , THREAD_BLOCKED_JOIN );
[1]	893
[436]	894	// set extended pointer on killer thread in target thread
	895	hal_remote_swd( target_join_xp_xp , killer_xp );
	896
	897	// release the join_lock in target thread descriptor
	898	remote_spinlock_unlock( target_join_lock_xp );
	899
	900	// deschedule
	901	sched_yield( "killer thread wait joining thread" );
	902
	903	// restore IRQs
	904	hal_restore_irq( save_sr );
	905	}
	906	} // end if attached
	907
	908	// - if the target thread is the main thread
	909	// => synchronize with the parent process main thread
	910	// - if the target thread is not the main thread
	911	// => simply mark the target thread for delete
	912
	913	// get pointer on target thread process
	914	target_process_xp = XPTR( target_cxy , &target_ptr->process );
	915	target_process = (process_t *)hal_remote_lpt( target_process_xp );
	916
	917	// get target process owner cluster
	918	target_pid = hal_remote_lw( XPTR( target_cxy , &target_process->pid ) );
	919	owner_cxy = CXY_FROM_PID( target_pid );
	920
	921	// get target thread local index
	922	target_trdid = hal_remote_lw( XPTR( target_cxy , &target_ptr->trdid ) );
	923	target_ltid = LTID_FROM_TRDID( target_trdid );
	924
	925	if( (owner_cxy == target_cxy) && (target_ltid == 0) ) // main thread
	926	{
	927	// get extended pointer on term_state in target process owner cluster
	928	process_state_xp = XPTR( owner_cxy , &target_process->term_state );
	929
	930	// set termination info in target process owner
	931	if( is_exit ) hal_remote_atomic_or( process_state_xp , PROCESS_TERM_EXIT );
	932	else hal_remote_atomic_or( process_state_xp , PROCESS_TERM_KILL );
	933
[440]	934	#if DEBUG_THREAD_DELETE
[433]	935	cycle = (uint32_t)hal_get_cycles;
[440]	936	if( DEBUG_THREAD_DELETE < cycle )
[436]	937	printk("\n[DBG] %s : thread %x exit for thread %x / main thread / cycle %d\n",
	938	__FUNCTION__, killer_ptr, target_ptr, cycle );
[433]	939	#endif
[409]	940
[436]	941	}
	942	else // main thread
	943	{
	944	// set the REQ_DELETE flag in target thread descriptor
	945	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_REQ_DELETE );
	946
[440]	947	#if DEBUG_THREAD_DELETE
[436]	948	cycle = (uint32_t)hal_get_cycles;
[440]	949	if( DEBUG_THREAD_DELETE < cycle )
[436]	950	printk("\n[DBG] %s : thread %x exit for thread %x / not the main thread / cycle %d\n",
	951	__FUNCTION__, killer_ptr, target_ptr, cycle );
	952	#endif
	953
	954	}
	955
[407]	956	} // end thread_kill()
	957
[440]	958	*/
	959
	960	//////////////////////////////////////
	961	void thread_delete( xptr_t target_xp,
	962	pid_t pid,
	963	bool_t is_forced )
	964	{
	965	reg_t save_sr; // for critical section
	966	bool_t target_join_done; // joining thread arrived first
	967	bool_t target_attached; // target thread attached
	968	xptr_t killer_xp; // extended pointer on killer thread (this)
	969	thread_t * killer_ptr; // pointer on killer thread (this)
	970	cxy_t target_cxy; // target thread cluster
	971	thread_t * target_ptr; // pointer on target thread
	972	xptr_t target_flags_xp; // extended pointer on target thread <flags>
	973	uint32_t target_flags; // target thread <flags> value
	974	xptr_t target_join_lock_xp; // extended pointer on target thread <join_lock>
	975	xptr_t target_join_xp_xp; // extended pointer on target thread <join_xp>
	976	trdid_t target_trdid; // target thread identifier
	977	ltid_t target_ltid; // target thread local index
	978	xptr_t joining_xp; // extended pointer on joining thread
	979	thread_t * joining_ptr; // pointer on joining thread
	980	cxy_t joining_cxy; // joining thread cluster
	981	cxy_t owner_cxy; // process owner cluster
	982
	983
	984	// get target thread pointers, identifiers, and flags
	985	target_cxy = GET_CXY( target_xp );
	986	target_ptr = GET_PTR( target_xp );
	987	target_trdid = hal_remote_lw( XPTR( target_cxy , &target_ptr->trdid ) );
	988	target_ltid = LTID_FROM_TRDID( target_trdid );
	989	target_flags_xp = XPTR( target_cxy , &target_ptr->flags );
	990	target_flags = hal_remote_lw( target_flags_xp );
	991
	992	// get killer thread pointers
	993	killer_ptr = CURRENT_THREAD;
	994	killer_xp = XPTR( local_cxy , killer_ptr );
	995
	996	#if DEBUG_THREAD_DELETE
	997	uint32_t cycle = (uint32_t)hal_get_cycles;
	998	if( DEBUG_THREAD_DELETE < cycle )
	999	printk("\n[DBG] %s : killer thread %x enter for target thread %x / cycle %d\n",
	1000	__FUNCTION__, killer_ptr, target_ptr, cycle );
	1001	#endif
	1002
	1003	// target thread cannot be the main thread, because the main thread
	1004	// must be deleted by the parent process sys_wait() function
	1005	owner_cxy = CXY_FROM_PID( pid );
	1006	assert( ((owner_cxy != target_cxy) \|\| (target_ltid != 0)), __FUNCTION__,
	1007	"tharget thread cannot be the main thread\n" );
	1008
	1009	// block the target thread
	1010	thread_block( target_xp , THREAD_BLOCKED_GLOBAL );
	1011
	1012	// get attached from target flag descriptor
	1013	target_attached = ((hal_remote_lw( target_flags_xp ) & THREAD_FLAG_DETACHED) != 0);
	1014
	1015	// synchronize with the joining thread if the target thread is attached
	1016	if( target_attached && (is_forced == false) )
	1017	{
	1018	// build extended pointers on target thread join fields
	1019	target_join_lock_xp = XPTR( target_cxy , &target_ptr->join_lock );
	1020	target_join_xp_xp = XPTR( target_cxy , &target_ptr->join_xp );
	1021
	1022	// enter critical section
	1023	hal_disable_irq( &save_sr );
	1024
	1025	// take the join_lock in target thread descriptor
	1026	remote_spinlock_lock( target_join_lock_xp );
	1027
	1028	// get join_done from target thread descriptor
	1029	target_join_done = ((hal_remote_lw( target_flags_xp ) & THREAD_FLAG_JOIN_DONE) != 0);
	1030
	1031	if( target_join_done ) // joining thread arrived first => unblock the joining thread
	1032	{
	1033	// get extended pointer on joining thread
	1034	joining_xp = (xptr_t)hal_remote_lwd( target_join_xp_xp );
	1035	joining_ptr = GET_PTR( joining_xp );
	1036	joining_cxy = GET_CXY( joining_xp );
	1037
	1038	// reset the join_done flag in target thread
	1039	hal_remote_atomic_and( target_flags_xp , ~THREAD_FLAG_JOIN_DONE );
	1040
	1041	// unblock the joining thread
	1042	thread_unblock( joining_xp , THREAD_BLOCKED_JOIN );
	1043
	1044	// release the join_lock in target thread descriptor
	1045	remote_spinlock_unlock( target_join_lock_xp );
	1046
	1047	// restore IRQs
	1048	hal_restore_irq( save_sr );
	1049	}
	1050	else // this thread arrived first => register flags and deschedule
	1051	{
	1052	// set the kill_done flag in target thread
	1053	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_KILL_DONE );
	1054
	1055	// block this thread on BLOCKED_JOIN
	1056	thread_block( killer_xp , THREAD_BLOCKED_JOIN );
	1057
	1058	// set extended pointer on killer thread in target thread
	1059	hal_remote_swd( target_join_xp_xp , killer_xp );
	1060
	1061	// release the join_lock in target thread descriptor
	1062	remote_spinlock_unlock( target_join_lock_xp );
	1063
	1064	// deschedule
	1065	sched_yield( "killer thread wait joining thread" );
	1066
	1067	// restore IRQs
	1068	hal_restore_irq( save_sr );
	1069	}
	1070	} // end if attached
	1071
	1072	// set the REQ_DELETE flag in target thread descriptor
	1073	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_REQ_DELETE );
	1074
	1075	#if DEBUG_THREAD_DELETE
	1076	cycle = (uint32_t)hal_get_cycles;
	1077	if( DEBUG_THREAD_DELETE < cycle )
	1078	printk("\n[DBG] %s : killer thread %x exit for target thread %x / cycle %d\n",
	1079	__FUNCTION__, killer_ptr, target_ptr, cycle );
	1080	#endif
	1081
	1082	} // end thread_delete()
	1083
	1084
	1085
[14]	1086	///////////////////////
	1087	void thread_idle_func()
[1]	1088	{
	1089	while( 1 )
	1090	{
[408]	1091	// unmask IRQs
	1092	hal_enable_irq( NULL );
	1093
[407]	1094	if( CONFIG_THREAD_IDLE_MODE_SLEEP ) // force core to low-power mode
	1095	{
[1]	1096
[438]	1097	#if DEBUG_THREAD_IDLE
[433]	1098	uint32_t cycle = (uint32_t)hal_get_cycles;
	1099	thread_t * this = CURRENT_THREAD;
[438]	1100	if( DEBUG_THREAD_IDLE < cycle )
[433]	1101	printk("\n[DBG] %s : idle thread %x on core[%x,%d] goes to sleep / cycle %d\n",
	1102	__FUNCTION__, this, local_cxy, this->core->lid, cycle );
	1103	#endif
[1]	1104
[407]	1105	hal_core_sleep();
[1]	1106
[438]	1107	#if DEBUG_THREAD_IDLE
[433]	1108	cycle = (uint32_t)hal_get_cycles;
[438]	1109	if( DEBUG_THREAD_IDLE < cycle )
[433]	1110	printk("\n[DBG] %s : idle thread %x on core[%x,%d] wake up / cycle %d\n",
	1111	__FUNCTION__, this, local_cxy, this->core->lid, cycle );
	1112	#endif
[407]	1113
	1114	}
[418]	1115	else // search a runable thread
[407]	1116	{
[418]	1117	sched_yield( "IDLE" );
[407]	1118	}
[418]	1119	}
[407]	1120	} // end thread_idle()
[1]	1121
[407]	1122
[16]	1123	/////////////////////////////////////////////////
	1124	void thread_user_time_update( thread_t * thread )
	1125	{
	1126	// TODO
[337]	1127	// printk("\n[WARNING] function %s not implemented\n", __FUNCTION__ );
[16]	1128	}
[1]	1129
[16]	1130	///////////////////////////////////////////////////
	1131	void thread_kernel_time_update( thread_t * thread )
	1132	{
	1133	// TODO
[337]	1134	// printk("\n[WARNING] function %s not implemented\n", __FUNCTION__ );
[16]	1135	}
	1136
[23]	1137	/////////////////////////////////////
	1138	xptr_t thread_get_xptr( pid_t pid,
	1139	trdid_t trdid )
	1140	{
	1141	cxy_t target_cxy; // target thread cluster identifier
	1142	ltid_t target_thread_ltid; // target thread local index
[171]	1143	thread_t * target_thread_ptr; // target thread local pointer
[23]	1144	xptr_t target_process_xp; // extended pointer on target process descriptor
[171]	1145	process_t * target_process_ptr; // local pointer on target process descriptor
[23]	1146	pid_t target_process_pid; // target process identifier
	1147	xlist_entry_t root; // root of list of process in target cluster
	1148	xptr_t lock_xp; // extended pointer on lock protecting this list
[16]	1149
[23]	1150	// get target cluster identifier and local thread identifier
	1151	target_cxy = CXY_FROM_TRDID( trdid );
	1152	target_thread_ltid = LTID_FROM_TRDID( trdid );
	1153
[436]	1154	// check trdid argument
	1155	if( (target_thread_ltid >= CONFIG_THREAD_MAX_PER_CLUSTER) \|\|
	1156	cluster_is_undefined( target_cxy ) ) return XPTR_NULL;
	1157
[23]	1158	// get root of list of process descriptors in target cluster
	1159	hal_remote_memcpy( XPTR( local_cxy , &root ),
	1160	XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ),
	1161	sizeof(xlist_entry_t) );
	1162
[171]	1163	// get extended pointer on lock protecting the list of processes
[23]	1164	lock_xp = XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_lock );
	1165
	1166	// take the lock protecting the list of processes in target cluster
	1167	remote_spinlock_lock( lock_xp );
	1168
	1169	// loop on list of process in target cluster to find the PID process
	1170	xptr_t iter;
	1171	bool_t found = false;
	1172	XLIST_FOREACH( XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ) , iter )
	1173	{
	1174	target_process_xp = XLIST_ELEMENT( iter , process_t , local_list );
	1175	target_process_ptr = (process_t *)GET_PTR( target_process_xp );
	1176	target_process_pid = hal_remote_lw( XPTR( target_cxy , &target_process_ptr->pid ) );
	1177	if( target_process_pid == pid )
	1178	{
	1179	found = true;
	1180	break;
	1181	}
	1182	}
	1183
	1184	// release the lock protecting the list of processes in target cluster
	1185	remote_spinlock_unlock( lock_xp );
	1186
[436]	1187	// check PID found
	1188	if( found == false ) return XPTR_NULL;
[23]	1189
	1190	// get target thread local pointer
	1191	xptr_t xp = XPTR( target_cxy , &target_process_ptr->th_tbl[target_thread_ltid] );
[171]	1192	target_thread_ptr = (thread_t *)hal_remote_lpt( xp );
[23]	1193
[436]	1194	if( target_thread_ptr == NULL ) return XPTR_NULL;
[23]	1195
	1196	return XPTR( target_cxy , target_thread_ptr );
[171]	1197	}
[23]	1198

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