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source: trunk/kernel/kern/thread.c @ 468

Last change on this file since 468 was 457, checked in by alain, 6 years ago
This version modifies the exec syscall and fixes a large number of small bugs. The version number has been updated (0.1)
File size: 41.0 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>
[457]	26	#include <hal_kernel_types.h>
[1]	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>
[446]	44	#include <rpc.h>
[1]	45
	46	//////////////////////////////////////////////////////////////////////////////////////
	47	// Extern global variables
	48	//////////////////////////////////////////////////////////////////////////////////////
	49
	50	extern process_t process_zero;
	51
	52	//////////////////////////////////////////////////////////////////////////////////////
[16]	53	// This function returns a printable string for the thread type.
[1]	54	//////////////////////////////////////////////////////////////////////////////////////
[5]	55	char * thread_type_str( uint32_t type )
	56	{
[296]	57	if ( type == THREAD_USER ) return "USR";
[16]	58	else if( type == THREAD_RPC ) return "RPC";
	59	else if( type == THREAD_DEV ) return "DEV";
[296]	60	else if( type == THREAD_IDLE ) return "IDL";
[5]	61	else return "undefined";
	62	}
	63
[1]	64	/////////////////////////////////////////////////////////////////////////////////////
[14]	65	// This static function allocates physical memory for a thread descriptor.
	66	// It can be called by the three functions:
[1]	67	// - thread_user_create()
[14]	68	// - thread_user_fork()
[1]	69	// - thread_kernel_create()
	70	/////////////////////////////////////////////////////////////////////////////////////
[14]	71	// @ return pointer on thread descriptor if success / return NULL if failure.
[1]	72	/////////////////////////////////////////////////////////////////////////////////////
[14]	73	static thread_t * thread_alloc()
[1]	74	{
[23]	75	page_t * page; // pointer on page descriptor containing thread descriptor
[171]	76	kmem_req_t req; // kmem request
[1]	77
	78	// allocates memory for thread descriptor + kernel stack
	79	req.type = KMEM_PAGE;
[14]	80	req.size = CONFIG_THREAD_DESC_ORDER;
[1]	81	req.flags = AF_KERNEL \| AF_ZERO;
	82	page = kmem_alloc( &req );
	83
[23]	84	if( page == NULL ) return NULL;
[1]	85
[315]	86	// return pointer on new thread descriptor
	87	xptr_t base_xp = ppm_page2base( XPTR(local_cxy , page ) );
	88	return (thread_t *)GET_PTR( base_xp );
	89
	90	} // end thread_alloc()
	91
	92
[14]	93	/////////////////////////////////////////////////////////////////////////////////////
[23]	94	// This static function releases the physical memory for a thread descriptor.
[53]	95	// It is called by the three functions:
[23]	96	// - thread_user_create()
	97	// - thread_user_fork()
	98	// - thread_kernel_create()
	99	/////////////////////////////////////////////////////////////////////////////////////
	100	// @ thread : pointer on thread descriptor.
	101	/////////////////////////////////////////////////////////////////////////////////////
	102	static void thread_release( thread_t * thread )
	103	{
	104	kmem_req_t req;
	105
[315]	106	xptr_t base_xp = ppm_base2page( XPTR(local_cxy , thread ) );
	107
[23]	108	req.type = KMEM_PAGE;
[315]	109	req.ptr = GET_PTR( base_xp );
[23]	110	kmem_free( &req );
	111	}
	112
	113	/////////////////////////////////////////////////////////////////////////////////////
[14]	114	// This static function initializes a thread descriptor (kernel or user).
[438]	115	// It can be called by the four functions:
[14]	116	// - thread_user_create()
	117	// - thread_user_fork()
	118	// - thread_kernel_create()
[438]	119	// - thread_idle_init()
	120	// It updates the local DQDT.
[14]	121	/////////////////////////////////////////////////////////////////////////////////////
	122	// @ thread : pointer on thread descriptor
	123	// @ process : pointer on process descriptor.
	124	// @ type : thread type.
	125	// @ func : pointer on thread entry function.
	126	// @ args : pointer on thread entry function arguments.
	127	// @ core_lid : target core local index.
	128	// @ u_stack_base : stack base (user thread only)
	129	// @ u_stack_size : stack base (user thread only)
	130	/////////////////////////////////////////////////////////////////////////////////////
	131	static error_t thread_init( thread_t * thread,
	132	process_t * process,
	133	thread_type_t type,
	134	void * func,
	135	void * args,
	136	lid_t core_lid,
	137	intptr_t u_stack_base,
	138	uint32_t u_stack_size )
	139	{
	140	error_t error;
	141	trdid_t trdid; // allocated thread identifier
	142
	143	cluster_t * local_cluster = LOCAL_CLUSTER;
	144
[443]	145	#if DEBUG_THREAD_USER_INIT
	146	uint32_t cycle = (uint32_t)hal_get_cycles();
	147	if( DEBUG_THREAD_USER_INIT < cycle )
	148	printk("\n[DBG] %s : thread %x enter to init thread %x in process %x / cycle %d\n",
	149	__FUNCTION__, CURRENT_THREAD, thread, process->pid , cycle );
	150	#endif
	151
[14]	152	// register new thread in process descriptor, and get a TRDID
[1]	153	error = process_register_thread( process, thread , &trdid );
	154
[171]	155	if( error )
[1]	156	{
[14]	157	printk("\n[ERROR] in %s : cannot get TRDID\n", __FUNCTION__ );
	158	return EINVAL;
[1]	159	}
[14]	160
[407]	161	// compute thread descriptor size without kernel stack
	162	uint32_t desc_size = (intptr_t)(&thread->signature) - (intptr_t)thread + 4;
	163
[1]	164	// Initialize new thread descriptor
	165	thread->trdid = trdid;
[171]	166	thread->type = type;
[1]	167	thread->quantum = 0; // TODO
	168	thread->ticks_nr = 0; // TODO
[457]	169	thread->time_last_check = 0; // TODO
[1]	170	thread->core = &local_cluster->core_tbl[core_lid];
	171	thread->process = process;
	172
	173	thread->local_locks = 0;
[409]	174	thread->remote_locks = 0;
[1]	175
[409]	176	#if CONFIG_LOCKS_DEBUG
	177	list_root_init( &thread->locks_root );
[1]	178	xlist_root_init( XPTR( local_cxy , &thread->xlocks_root ) );
[409]	179	#endif
[1]	180
[171]	181	thread->u_stack_base = u_stack_base;
[1]	182	thread->u_stack_size = u_stack_size;
[407]	183	thread->k_stack_base = (intptr_t)thread + desc_size;
	184	thread->k_stack_size = CONFIG_THREAD_DESC_SIZE - desc_size;
[1]	185
	186	thread->entry_func = func; // thread entry point
	187	thread->entry_args = args; // thread function arguments
[171]	188	thread->flags = 0; // all flags reset
[1]	189	thread->errno = 0; // no error detected
[407]	190	thread->fork_user = 0; // no user defined placement for fork
	191	thread->fork_cxy = 0; // user defined target cluster for fork
[409]	192	thread->blocked = THREAD_BLOCKED_GLOBAL;
[1]	193
[440]	194	// reset sched list
[1]	195	list_entry_init( &thread->sched_list );
	196
	197	// reset thread info
	198	memset( &thread->info , 0 , sizeof(thread_info_t) );
	199
[409]	200	// initializes join_lock
	201	remote_spinlock_init( XPTR( local_cxy , &thread->join_lock ) );
	202
[1]	203	// initialise signature
	204	thread->signature = THREAD_SIGNATURE;
	205
[443]	206	// FIXME define and call an architecture specific hal_thread_init()
	207	// function to initialise the save_sr field
[408]	208	thread->save_sr = 0xFF13;
	209
[171]	210	// register new thread in core scheduler
[1]	211	sched_register_thread( thread->core , thread );
	212
[438]	213	// update DQDT
	214	dqdt_update_threads( 1 );
	215
[443]	216	#if DEBUG_THREAD_USER_INIT
	217	cycle = (uint32_t)hal_get_cycles();
	218	if( DEBUG_THREAD_USER_INIT < cycle )
	219	printk("\n[DBG] %s : thread %x exit after init of thread %x in process %x / cycle %d\n",
	220	__FUNCTION__, CURRENT_THREAD, thread, process->pid , cycle );
	221	#endif
	222
[1]	223	return 0;
	224
[296]	225	} // end thread_init()
	226
[1]	227	/////////////////////////////////////////////////////////
[23]	228	error_t thread_user_create( pid_t pid,
	229	void * start_func,
	230	void * start_arg,
[1]	231	pthread_attr_t * attr,
[23]	232	thread_t ** new_thread )
[1]	233	{
	234	error_t error;
	235	thread_t * thread; // pointer on created thread descriptor
	236	process_t * process; // pointer to local process descriptor
	237	lid_t core_lid; // selected core local index
[23]	238	vseg_t * vseg; // stack vseg
[1]	239
[407]	240	assert( (attr != NULL) , __FUNCTION__, "pthread attributes must be defined" );
[5]	241
[438]	242	#if DEBUG_THREAD_USER_CREATE
[433]	243	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	244	if( DEBUG_THREAD_USER_CREATE < cycle )
[457]	245	printk("\n[DBG] %s : thread %x in process %x enter in cluster %x / cycle %d\n",
	246	__FUNCTION__, CURRENT_THREAD->trdid, pid , local_cxy , cycle );
[433]	247	#endif
[428]	248
[23]	249	// get process descriptor local copy
	250	process = process_get_local_copy( pid );
[440]	251
[23]	252	if( process == NULL )
	253	{
	254	printk("\n[ERROR] in %s : cannot get process descriptor %x\n",
	255	__FUNCTION__ , pid );
	256	return ENOMEM;
	257	}
	258
[443]	259	#if( DEBUG_THREAD_USER_CREATE & 1)
	260	if( DEBUG_THREAD_USER_CREATE < cycle )
	261	printk("\n[DBG] %s : process descriptor = %x for process %x in cluster %x\n",
	262	__FUNCTION__, process , pid , local_cxy );
	263	#endif
	264
[171]	265	// select a target core in local cluster
[407]	266	if( attr->attributes & PT_ATTR_CORE_DEFINED )
[23]	267	{
[407]	268	core_lid = attr->lid;
	269	if( core_lid >= LOCAL_CLUSTER->cores_nr )
	270	{
	271	printk("\n[ERROR] in %s : illegal core index attribute = %d\n",
	272	__FUNCTION__ , core_lid );
	273	return EINVAL;
	274	}
[23]	275	}
[407]	276	else
	277	{
	278	core_lid = cluster_select_local_core();
	279	}
[1]	280
[443]	281	#if( DEBUG_THREAD_USER_CREATE & 1)
	282	if( DEBUG_THREAD_USER_CREATE < cycle )
	283	printk("\n[DBG] %s : core[%x,%d] selected\n",
	284	__FUNCTION__, local_cxy , core_lid );
	285	#endif
	286
[171]	287	// allocate a stack from local VMM
[407]	288	vseg = vmm_create_vseg( process,
	289	VSEG_TYPE_STACK,
	290	0, // size unused
	291	0, // length unused
	292	0, // file_offset unused
	293	0, // file_size unused
	294	XPTR_NULL, // mapper_xp unused
	295	local_cxy );
[1]	296
[170]	297	if( vseg == NULL )
[23]	298	{
	299	printk("\n[ERROR] in %s : cannot create stack vseg\n", __FUNCTION__ );
	300	return ENOMEM;
[171]	301	}
[23]	302
[457]	303	#if( DEBUG_THREAD_USER_CREATE & 1)
	304	if( DEBUG_THREAD_USER_CREATE < cycle )
	305	printk("\n[DBG] %s : stack vseg created / vpn_base %x / %d pages\n",
	306	__FUNCTION__, vseg->vpn_base, vseg->vpn_size );
	307	#endif
	308
[171]	309	// allocate memory for thread descriptor
[14]	310	thread = thread_alloc();
[1]	311
[23]	312	if( thread == NULL )
	313	{
	314	printk("\n[ERROR] in %s : cannot create new thread\n", __FUNCTION__ );
	315	vmm_remove_vseg( vseg );
	316	return ENOMEM;
	317	}
[14]	318
[443]	319	#if( DEBUG_THREAD_USER_CREATE & 1)
	320	if( DEBUG_THREAD_USER_CREATE < cycle )
[457]	321	printk("\n[DBG] %s : new thread descriptor %x allocated\n",
[443]	322	__FUNCTION__, thread );
	323	#endif
	324
[171]	325	// initialize thread descriptor
[14]	326	error = thread_init( thread,
	327	process,
	328	THREAD_USER,
[23]	329	start_func,
	330	start_arg,
[14]	331	core_lid,
[23]	332	vseg->min,
	333	vseg->max - vseg->min );
[171]	334	if( error )
[14]	335	{
[23]	336	printk("\n[ERROR] in %s : cannot initialize new thread\n", __FUNCTION__ );
	337	vmm_remove_vseg( vseg );
	338	thread_release( thread );
[14]	339	return EINVAL;
	340	}
	341
[443]	342	#if( DEBUG_THREAD_USER_CREATE & 1)
	343	if( DEBUG_THREAD_USER_CREATE < cycle )
[457]	344	printk("\n[DBG] %s : new thread descriptor initialised / trdid %x\n",
	345	__FUNCTION__, thread->trdid );
[443]	346	#endif
	347
[14]	348	// set DETACHED flag if required
[407]	349	if( attr->attributes & PT_ATTR_DETACH )
	350	{
	351	thread->flags \|= THREAD_FLAG_DETACHED;
	352	}
[1]	353
[171]	354	// allocate & initialize CPU context
[457]	355	if( hal_cpu_context_alloc( thread ) )
[23]	356	{
	357	printk("\n[ERROR] in %s : cannot create CPU context\n", __FUNCTION__ );
	358	vmm_remove_vseg( vseg );
	359	thread_release( thread );
	360	return ENOMEM;
	361	}
[457]	362	hal_cpu_context_init( thread );
[23]	363
[457]	364	// allocate & initialize FPU context
[407]	365	if( hal_fpu_context_alloc( thread ) )
[23]	366	{
	367	printk("\n[ERROR] in %s : cannot create FPU context\n", __FUNCTION__ );
	368	vmm_remove_vseg( vseg );
	369	thread_release( thread );
	370	return ENOMEM;
	371	}
[457]	372	hal_fpu_context_init( thread );
[23]	373
[457]	374	#if( DEBUG_THREAD_USER_CREATE & 1)
	375	if( DEBUG_THREAD_USER_CREATE < cycle )
	376	printk("\n[DBG] %s : CPU & FPU contexts created\n",
	377	__FUNCTION__, thread->trdid );
	378	vmm_display( process , true );
	379	#endif
	380
[438]	381	#if DEBUG_THREAD_USER_CREATE
[433]	382	cycle = (uint32_t)hal_get_cycles();
[438]	383	if( DEBUG_THREAD_USER_CREATE < cycle )
[457]	384	printk("\n[DBG] %s : thread %x in process %x exit / new_thread %x / core %d / cycle %d\n",
	385	__FUNCTION__, CURRENT_THREAD->trdid , pid, thread->trdid, core_lid, cycle );
[433]	386	#endif
[1]	387
	388	*new_thread = thread;
	389	return 0;
[14]	390
[296]	391	} // end thread_user_create()
	392
[408]	393	///////////////////////////////////////////////////////
	394	error_t thread_user_fork( xptr_t parent_thread_xp,
	395	process_t * child_process,
	396	thread_t ** child_thread )
[1]	397	{
	398	error_t error;
[408]	399	thread_t * child_ptr; // local pointer on local child thread
	400	lid_t core_lid; // selected core local index
[1]	401
[408]	402	thread_t * parent_ptr; // local pointer on remote parent thread
	403	cxy_t parent_cxy; // parent thread cluster
	404	process_t * parent_process; // local pointer on parent process
	405	xptr_t parent_gpt_xp; // extended pointer on parent thread GPT
[5]	406
[408]	407	void * func; // parent thread entry_func
	408	void * args; // parent thread entry_args
	409	intptr_t base; // parent thread u_stack_base
	410	uint32_t size; // parent thread u_stack_size
	411	uint32_t flags; // parent_thread flags
	412	vpn_t vpn_base; // parent thread stack vpn_base
	413	vpn_t vpn_size; // parent thread stack vpn_size
	414	reg_t * uzone; // parent thread pointer on uzone
	415
	416	vseg_t * vseg; // child thread STACK vseg
	417
[438]	418	#if DEBUG_THREAD_USER_FORK
[433]	419	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	420	if( DEBUG_THREAD_USER_FORK < cycle )
[433]	421	printk("\n[DBG] %s : thread %x enter / child_process %x / cycle %d\n",
	422	__FUNCTION__, CURRENT_THREAD, child_process->pid, cycle );
	423	#endif
[408]	424
[1]	425	// select a target core in local cluster
	426	core_lid = cluster_select_local_core();
	427
[408]	428	// get cluster and local pointer on parent thread descriptor
	429	parent_cxy = GET_CXY( parent_thread_xp );
	430	parent_ptr = (thread_t *)GET_PTR( parent_thread_xp );
[1]	431
[408]	432	// get relevant fields from parent thread
[428]	433	func = (void *) hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->entry_func ));
	434	args = (void *) hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->entry_args ));
	435	base = (intptr_t)hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->u_stack_base ));
	436	size = (uint32_t)hal_remote_lw ( XPTR( parent_cxy , &parent_ptr->u_stack_size ));
	437	flags = hal_remote_lw ( XPTR( parent_cxy , &parent_ptr->flags ));
	438	uzone = (reg_t *) hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->uzone_current ));
[1]	439
[408]	440	vpn_base = base >> CONFIG_PPM_PAGE_SHIFT;
	441	vpn_size = size >> CONFIG_PPM_PAGE_SHIFT;
	442
	443	// get pointer on parent process in parent thread cluster
	444	parent_process = (process_t *)hal_remote_lpt( XPTR( parent_cxy,
	445	&parent_ptr->process ) );
	446
	447	// get extended pointer on parent GPT in parent thread cluster
	448	parent_gpt_xp = XPTR( parent_cxy , &parent_process->vmm.gpt );
	449
	450	// allocate memory for child thread descriptor
	451	child_ptr = thread_alloc();
	452	if( child_ptr == NULL )
[23]	453	{
	454	printk("\n[ERROR] in %s : cannot allocate new thread\n", __FUNCTION__ );
[408]	455	return -1;
[23]	456	}
[14]	457
[171]	458	// initialize thread descriptor
[408]	459	error = thread_init( child_ptr,
	460	child_process,
[14]	461	THREAD_USER,
[408]	462	func,
	463	args,
[14]	464	core_lid,
[408]	465	base,
	466	size );
[23]	467	if( error )
[14]	468	{
[408]	469	printk("\n[ERROR] in %s : cannot initialize child thread\n", __FUNCTION__ );
	470	thread_release( child_ptr );
[14]	471	return EINVAL;
	472	}
	473
[407]	474	// return child pointer
[408]	475	*child_thread = child_ptr;
[1]	476
[408]	477	// set detached flag if required
	478	if( flags & THREAD_FLAG_DETACHED ) child_ptr->flags = THREAD_FLAG_DETACHED;
[1]	479
[408]	480	// update uzone pointer in child thread descriptor
[428]	481	child_ptr->uzone_current = (char *)((intptr_t)uzone +
	482	(intptr_t)child_ptr -
	483	(intptr_t)parent_ptr );
[408]	484
	485
[407]	486	// allocate CPU context for child thread
[408]	487	if( hal_cpu_context_alloc( child_ptr ) )
[23]	488	{
[407]	489	printk("\n[ERROR] in %s : cannot allocate CPU context\n", __FUNCTION__ );
[408]	490	thread_release( child_ptr );
	491	return -1;
[23]	492	}
	493
[407]	494	// allocate FPU context for child thread
[408]	495	if( hal_fpu_context_alloc( child_ptr ) )
[23]	496	{
[407]	497	printk("\n[ERROR] in %s : cannot allocate FPU context\n", __FUNCTION__ );
[408]	498	thread_release( child_ptr );
	499	return -1;
[23]	500	}
	501
[408]	502	// create and initialize STACK vseg
	503	vseg = vseg_alloc();
	504	vseg_init( vseg,
	505	VSEG_TYPE_STACK,
	506	base,
	507	size,
	508	vpn_base,
	509	vpn_size,
	510	0, 0, XPTR_NULL, // not a file vseg
	511	local_cxy );
[1]	512
[408]	513	// register STACK vseg in local child VSL
	514	vseg_attach( &child_process->vmm , vseg );
	515
	516	// copy all valid STACK GPT entries
	517	vpn_t vpn;
	518	bool_t mapped;
	519	ppn_t ppn;
	520	for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ )
	521	{
	522	error = hal_gpt_pte_copy( &child_process->vmm.gpt,
	523	parent_gpt_xp,
	524	vpn,
	525	true, // set cow
	526	&ppn,
	527	&mapped );
	528	if( error )
	529	{
	530	vseg_detach( &child_process->vmm , vseg );
	531	vseg_free( vseg );
	532	thread_release( child_ptr );
	533	printk("\n[ERROR] in %s : cannot update child GPT\n", __FUNCTION__ );
	534	return -1;
	535	}
	536
[433]	537	// increment pending forks counter for the page if mapped
[408]	538	if( mapped )
	539	{
	540	xptr_t page_xp = ppm_ppn2page( ppn );
	541	cxy_t page_cxy = GET_CXY( page_xp );
	542	page_t * page_ptr = (page_t *)GET_PTR( page_xp );
[433]	543	hal_remote_atomic_add( XPTR( page_cxy , &page_ptr->forks ) , 1 );
[408]	544
[438]	545	#if (DEBUG_THREAD_USER_FORK & 1)
[433]	546	cycle = (uint32_t)hal_get_cycles();
[438]	547	if( DEBUG_THREAD_USER_FORK < cycle )
[433]	548	printk("\n[DBG] %s : thread %x copied stack PTE to child GPT : vpn %x\n",
	549	__FUNCTION__, CURRENT_THREAD, vpn );
	550	#endif
[408]	551
	552	}
	553	}
	554
[433]	555	// set COW flag for all mapped entries of STAK vseg in parent thread GPT
	556	hal_gpt_set_cow( parent_gpt_xp,
	557	vpn_base,
	558	vpn_size );
[408]	559
[438]	560	#if DEBUG_THREAD_USER_FORK
[433]	561	cycle = (uint32_t)hal_get_cycles();
[438]	562	if( DEBUG_THREAD_USER_FORK < cycle )
[433]	563	printk("\n[DBG] %s : thread %x exit / child_process %x / child_thread %x / cycle %d\n",
	564	__FUNCTION__, CURRENT_THREAD, child_process->pid, child_ptr, cycle );
	565	#endif
[407]	566
[1]	567	return 0;
[5]	568
[296]	569	} // end thread_user_fork()
	570
[457]	571	////////////////////////////////////////////////
	572	error_t thread_user_exec( void * entry_func,
	573	uint32_t argc,
	574	char ** argv )
	575	{
	576	thread_t * thread = CURRENT_THREAD;
	577	process_t * process = thread->process;
	578
	579	#if DEBUG_THREAD_USER_EXEC
	580	uint32_t cycle = (uint32_t)hal_get_cycles();
	581	if( DEBUG_THREAD_USER_EXEC < cycle )
	582	printk("\n[DBG] %s : thread %x in process %x enter / cycle %d\n",
	583	__FUNCTION__, thread->trdid, process->pid, cycle );
	584	#endif
	585
	586	assert( (thread->type == THREAD_USER ) , __FUNCTION__, "bad type" );
	587	assert( (thread->signature == THREAD_SIGNATURE) , __FUNCTION__, "bad signature" );
	588	assert( (thread->local_locks == 0) , __FUNCTION__, "bad local locks" );
	589	assert( (thread->remote_locks == 0) , __FUNCTION__, "bad remote locks" );
	590
	591	// re-initialize various thread descriptor fields
	592	thread->quantum = 0; // TODO
	593	thread->ticks_nr = 0; // TODO
	594	thread->time_last_check = 0; // TODO
	595
	596	#if CONFIG_LOCKS_DEBUG
	597	list_root_init( &thread->locks_root );
	598	xlist_root_init( XPTR( local_cxy , &thread->xlocks_root ) );
	599	#endif
	600
	601	thread->entry_func = entry_func;
	602	thread->main_argc = argc;
	603	thread->main_argv = argv;
	604
	605	// the main thread is always detached
	606	thread->flags = THREAD_FLAG_DETACHED;
	607	thread->blocked = 0;
	608	thread->errno = 0;
	609	thread->fork_user = 0; // not inherited
	610	thread->fork_cxy = 0; // not inherited
	611
	612	// reset thread info
	613	memset( &thread->info , 0 , sizeof(thread_info_t) );
	614
	615	// initialize join_lock
	616	remote_spinlock_init( XPTR( local_cxy , &thread->join_lock ) );
	617
	618	// allocate an user stack vseg for main thread
	619	vseg_t * vseg = vmm_create_vseg( process,
	620	VSEG_TYPE_STACK,
	621	0, // size unused
	622	0, // length unused
	623	0, // file_offset unused
	624	0, // file_size unused
	625	XPTR_NULL, // mapper_xp unused
	626	local_cxy );
	627	if( vseg == NULL )
	628	{
	629	printk("\n[ERROR] in %s : cannot create stack vseg for main thread\n", __FUNCTION__ );
	630	return -1;
	631	}
	632
	633	// update user stack in stack descriptor
	634	thread->u_stack_base = vseg->min;
	635	thread->u_stack_size = vseg->max - vseg->min;
	636
	637	// release FPU ownership if required
	638	if( thread->core->fpu_owner == thread ) thread->core->fpu_owner = NULL;
	639
	640	// re-initialize FPU context
	641	hal_fpu_context_init( thread );
	642
	643	#if DEBUG_THREAD_USER_EXEC
	644	cycle = (uint32_t)hal_get_cycles();
	645	if( DEBUG_THREAD_USER_EXEC < cycle )
	646	printk("\n[DBG] %s : thread %x in process %x set CPU context & jump to user code / cycle %d\n",
	647	__FUNCTION__, thread->trdid, process->pid, cycle );
	648	vmm_display( process , true );
	649	#endif
	650
	651	// re-initialize CPU context... and jump to user code
	652	hal_cpu_context_exec( thread );
	653
	654	assert( false, __FUNCTION__, "we should execute this code");
	655
	656	return 0;
	657
	658	} // end thread_user_exec()
	659
[1]	660	/////////////////////////////////////////////////////////
	661	error_t thread_kernel_create( thread_t ** new_thread,
	662	thread_type_t type,
[171]	663	void * func,
	664	void * args,
[1]	665	lid_t core_lid )
	666	{
	667	error_t error;
[14]	668	thread_t * thread; // pointer on new thread descriptor
[1]	669
[407]	670	assert( ( (type == THREAD_IDLE) \|\| (type == THREAD_RPC) \|\| (type == THREAD_DEV) ) ,
	671	__FUNCTION__ , "illegal thread type" );
[1]	672
[171]	673	assert( (core_lid < LOCAL_CLUSTER->cores_nr) ,
[5]	674	__FUNCTION__ , "illegal core_lid" );
[1]	675
[438]	676	#if DEBUG_THREAD_KERNEL_CREATE
[433]	677	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	678	if( DEBUG_THREAD_KERNEL_CREATE < cycle )
[433]	679	printk("\n[DBG] %s : thread %x enter / requested_type %s / cycle %d\n",
	680	__FUNCTION__, CURRENT_THREAD, thread, thread_type_str(type), cycle );
	681	#endif
	682
[171]	683	// allocate memory for new thread descriptor
[14]	684	thread = thread_alloc();
	685
	686	if( thread == NULL ) return ENOMEM;
	687
[171]	688	// initialize thread descriptor
[14]	689	error = thread_init( thread,
	690	&process_zero,
	691	type,
	692	func,
	693	args,
	694	core_lid,
	695	0 , 0 ); // no user stack for a kernel thread
	696
[171]	697	if( error ) // release allocated memory for thread descriptor
[1]	698	{
[185]	699	thread_release( thread );
[457]	700	return ENOMEM;
[1]	701	}
	702
[171]	703	// allocate & initialize CPU context
[457]	704	error = hal_cpu_context_alloc( thread );
	705	if( error )
	706	{
	707	thread_release( thread );
	708	return EINVAL;
	709	}
	710	hal_cpu_context_init( thread );
[14]	711
[457]	712
[438]	713	#if DEBUG_THREAD_KERNEL_CREATE
[433]	714	cycle = (uint32_t)hal_get_cycles();
[438]	715	if( DEBUG_THREAD_KERNEL_CREATE < cycle )
[433]	716	printk("\n[DBG] %s : thread %x exit / new_thread %x / type %s / cycle %d\n",
	717	__FUNCTION__, CURRENT_THREAD, thread, thread_type_str(type), cycle );
	718	#endif
[1]	719
[171]	720	*new_thread = thread;
[1]	721	return 0;
[5]	722
[296]	723	} // end thread_kernel_create()
	724
[457]	725	//////////////////////////////////////////////
	726	void thread_idle_init( thread_t * thread,
	727	thread_type_t type,
	728	void * func,
	729	void * args,
	730	lid_t core_lid )
[14]	731	{
[407]	732	assert( (type == THREAD_IDLE) , __FUNCTION__ , "illegal thread type" );
	733	assert( (core_lid < LOCAL_CLUSTER->cores_nr) , __FUNCTION__ , "illegal core index" );
[14]	734
[457]	735	// initialize thread descriptor
[14]	736	error_t error = thread_init( thread,
	737	&process_zero,
	738	type,
	739	func,
	740	args,
	741	core_lid,
	742	0 , 0 ); // no user stack for a kernel thread
	743
[457]	744	assert( (error == 0), __FUNCTION__, "cannot create thread idle" );
	745
[14]	746	// allocate & initialize CPU context if success
[457]	747	error = hal_cpu_context_alloc( thread );
[171]	748
[457]	749	assert( (error == 0), __FUNCTION__, "cannot allocate CPU context" );
[14]	750
[457]	751	hal_cpu_context_init( thread );
	752
[438]	753	} // end thread_idle_init()
[407]	754
[1]	755	///////////////////////////////////////////////////////////////////////////////////////
	756	// TODO: check that all memory dynamically allocated during thread execution
[440]	757	// has been released, using a cache of mmap requests. [AG]
[1]	758	///////////////////////////////////////////////////////////////////////////////////////
[443]	759	bool_t thread_destroy( thread_t * thread )
[1]	760	{
[409]	761	reg_t save_sr;
[443]	762	bool_t last_thread;
[1]	763
	764	process_t * process = thread->process;
	765	core_t * core = thread->core;
	766
[438]	767	#if DEBUG_THREAD_DESTROY
[433]	768	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	769	if( DEBUG_THREAD_DESTROY < cycle )
[433]	770	printk("\n[DBG] %s : thread %x enter to destroy thread %x in process %x / cycle %d\n",
[450]	771	__FUNCTION__, CURRENT_THREAD, thread->trdid, process->pid, cycle );
[433]	772	#endif
[1]	773
[443]	774	assert( (thread->local_locks == 0) , __FUNCTION__ ,
	775	"local lock not released for thread %x in process %x", thread->trdid, process->pid );
[171]	776
[443]	777	assert( (thread->remote_locks == 0) , __FUNCTION__ ,
	778	"remote lock not released for thread %x in process %x", thread->trdid, process->pid );
[5]	779
[1]	780	// update intrumentation values
[408]	781	process->vmm.pgfault_nr += thread->info.pgfault_nr;
[1]	782
	783	// release memory allocated for CPU context and FPU context
	784	hal_cpu_context_destroy( thread );
[409]	785	if ( thread->type == THREAD_USER ) hal_fpu_context_destroy( thread );
[1]	786
[428]	787	// release FPU ownership if required
[409]	788	hal_disable_irq( &save_sr );
[1]	789	if( core->fpu_owner == thread )
	790	{
	791	core->fpu_owner = NULL;
	792	hal_fpu_disable();
	793	}
[409]	794	hal_restore_irq( save_sr );
[1]	795
[171]	796	// remove thread from process th_tbl[]
[443]	797	last_thread = process_remove_thread( thread );
[1]	798
[438]	799	// update DQDT
	800	dqdt_update_threads( -1 );
[23]	801
[1]	802	// invalidate thread descriptor
	803	thread->signature = 0;
	804
	805	// release memory for thread descriptor
[23]	806	thread_release( thread );
[1]	807
[438]	808	#if DEBUG_THREAD_DESTROY
[433]	809	cycle = (uint32_t)hal_get_cycles();
[438]	810	if( DEBUG_THREAD_DESTROY < cycle )
[450]	811	printk("\n[DBG] %s : thread %x exit / destroyed thread %x in process %x / last %d / cycle %d\n",
	812	__FUNCTION__, CURRENT_THREAD, thread->trdid, process->pid, last_thread / cycle );
[433]	813	#endif
[1]	814
[443]	815	return last_thread;
	816
[407]	817	} // end thread_destroy()
	818
[416]	819	//////////////////////////////////////////////////
	820	inline void thread_set_req_ack( thread_t * target,
	821	uint32_t * rsp_count )
[1]	822	{
[409]	823	reg_t save_sr; // for critical section
	824
[416]	825	// get pointer on target thread scheduler
	826	scheduler_t * sched = &target->core->scheduler;
[409]	827
[416]	828	// wait scheduler ready to handle a new request
	829	while( sched->req_ack_pending ) asm volatile( "nop" );
[409]	830
	831	// enter critical section
	832	hal_disable_irq( &save_sr );
	833
[416]	834	// set request in target thread scheduler
	835	sched->req_ack_pending = true;
[409]	836
[416]	837	// set ack request in target thread "flags"
	838	hal_atomic_or( &target->flags , THREAD_FLAG_REQ_ACK );
[409]	839
[416]	840	// set pointer on responses counter in target thread
	841	target->ack_rsp_count = rsp_count;
[409]	842
	843	// exit critical section
	844	hal_restore_irq( save_sr );
	845
[407]	846	hal_fence();
[171]	847
[416]	848	} // thread_set_req_ack()
[409]	849
[416]	850	/////////////////////////////////////////////////////
	851	inline void thread_reset_req_ack( thread_t * target )
[1]	852	{
[409]	853	reg_t save_sr; // for critical section
	854
	855	// get pointer on target thread scheduler
[416]	856	scheduler_t * sched = &target->core->scheduler;
[409]	857
	858	// check signal pending in scheduler
[416]	859	assert( sched->req_ack_pending , __FUNCTION__ , "no pending signal" );
[409]	860
	861	// enter critical section
	862	hal_disable_irq( &save_sr );
	863
	864	// reset signal in scheduler
[416]	865	sched->req_ack_pending = false;
[409]	866
	867	// reset signal in thread "flags"
[416]	868	hal_atomic_and( &target->flags , ~THREAD_FLAG_REQ_ACK );
[409]	869
	870	// reset pointer on responses counter
[416]	871	target->ack_rsp_count = NULL;
[409]	872
	873	// exit critical section
	874	hal_restore_irq( save_sr );
	875
[407]	876	hal_fence();
[171]	877
[416]	878	} // thread_reset_req_ack()
[409]	879
[1]	880	////////////////////////////////
	881	inline bool_t thread_can_yield()
	882	{
	883	thread_t * this = CURRENT_THREAD;
[367]	884	return (this->local_locks == 0) && (this->remote_locks == 0);
[1]	885	}
	886
[367]	887	/////////////////////////
	888	void thread_check_sched()
[1]	889	{
[338]	890	thread_t * this = CURRENT_THREAD;
[1]	891
[367]	892	if( (this->local_locks == 0) &&
	893	(this->remote_locks == 0) &&
	894	(this->flags & THREAD_FLAG_SCHED) )
	895	{
	896	this->flags &= ~THREAD_FLAG_SCHED;
[408]	897	sched_yield( "delayed scheduling" );
[367]	898	}
[1]	899
[407]	900	} // end thread_check_sched()
	901
[436]	902	//////////////////////////////////////
	903	void thread_block( xptr_t thread_xp,
	904	uint32_t cause )
[407]	905	{
[436]	906	// get thread cluster and local pointer
	907	cxy_t cxy = GET_CXY( thread_xp );
	908	thread_t * ptr = GET_PTR( thread_xp );
	909
[407]	910	// set blocking cause
[436]	911	hal_remote_atomic_or( XPTR( cxy , &ptr->blocked ) , cause );
[407]	912	hal_fence();
	913
[438]	914	#if DEBUG_THREAD_BLOCK
[457]	915	uint32_t cycle = (uint32_t)hal_get_cycles();
	916	process_t * process = hal_remote_lpt( XPTR( cxy , &ptr->process ) );
[438]	917	if( DEBUG_THREAD_BLOCK < cycle )
[457]	918	printk("\n[DBG] %s : thread %x in process %x blocked thread %x in process %x / cause %x\n",
	919	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
	920	ptr->trdid, hal_remote_lw(XPTR( cxy , &process->pid )), cause );
[433]	921	#endif
	922
[407]	923	} // end thread_block()
	924
[433]	925	////////////////////////////////////////////
	926	uint32_t thread_unblock( xptr_t thread_xp,
[407]	927	uint32_t cause )
	928	{
	929	// get thread cluster and local pointer
[433]	930	cxy_t cxy = GET_CXY( thread_xp );
	931	thread_t * ptr = GET_PTR( thread_xp );
[407]	932
	933	// reset blocking cause
	934	uint32_t previous = hal_remote_atomic_and( XPTR( cxy , &ptr->blocked ) , ~cause );
	935	hal_fence();
	936
[438]	937	#if DEBUG_THREAD_BLOCK
[457]	938	uint32_t cycle = (uint32_t)hal_get_cycles();
	939	process_t * process = hal_remote_lpt( XPTR( cxy , &ptr->process ) );
[438]	940	if( DEBUG_THREAD_BLOCK < cycle )
[457]	941	printk("\n[DBG] %s : thread %x in process %x unblocked thread %x in process %x / cause %x\n",
	942	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
	943	ptr->trdid, hal_remote_lw(XPTR( cxy , &process->pid )), cause );
[433]	944	#endif
	945
[446]	946	// return a non zero value if the cause bit is modified
	947	return( previous & cause );
[436]	948
[446]	949	} // end thread_unblock()
[407]	950
[440]	951	//////////////////////////////////////
	952	void thread_delete( xptr_t target_xp,
	953	pid_t pid,
	954	bool_t is_forced )
	955	{
	956	reg_t save_sr; // for critical section
	957	bool_t target_join_done; // joining thread arrived first
	958	bool_t target_attached; // target thread attached
	959	xptr_t killer_xp; // extended pointer on killer thread (this)
	960	thread_t * killer_ptr; // pointer on killer thread (this)
	961	cxy_t target_cxy; // target thread cluster
	962	thread_t * target_ptr; // pointer on target thread
	963	xptr_t target_flags_xp; // extended pointer on target thread <flags>
	964	uint32_t target_flags; // target thread <flags> value
	965	xptr_t target_join_lock_xp; // extended pointer on target thread <join_lock>
	966	xptr_t target_join_xp_xp; // extended pointer on target thread <join_xp>
	967	trdid_t target_trdid; // target thread identifier
	968	ltid_t target_ltid; // target thread local index
	969	xptr_t joining_xp; // extended pointer on joining thread
	970	thread_t * joining_ptr; // pointer on joining thread
	971	cxy_t joining_cxy; // joining thread cluster
	972	cxy_t owner_cxy; // process owner cluster
	973
	974
	975	// get target thread pointers, identifiers, and flags
	976	target_cxy = GET_CXY( target_xp );
	977	target_ptr = GET_PTR( target_xp );
	978	target_trdid = hal_remote_lw( XPTR( target_cxy , &target_ptr->trdid ) );
	979	target_ltid = LTID_FROM_TRDID( target_trdid );
	980	target_flags_xp = XPTR( target_cxy , &target_ptr->flags );
	981	target_flags = hal_remote_lw( target_flags_xp );
	982
	983	// get killer thread pointers
	984	killer_ptr = CURRENT_THREAD;
	985	killer_xp = XPTR( local_cxy , killer_ptr );
	986
	987	#if DEBUG_THREAD_DELETE
	988	uint32_t cycle = (uint32_t)hal_get_cycles;
	989	if( DEBUG_THREAD_DELETE < cycle )
	990	printk("\n[DBG] %s : killer thread %x enter for target thread %x / cycle %d\n",
	991	__FUNCTION__, killer_ptr, target_ptr, cycle );
	992	#endif
	993
	994	// target thread cannot be the main thread, because the main thread
	995	// must be deleted by the parent process sys_wait() function
	996	owner_cxy = CXY_FROM_PID( pid );
	997	assert( ((owner_cxy != target_cxy) \|\| (target_ltid != 0)), __FUNCTION__,
	998	"tharget thread cannot be the main thread\n" );
	999
	1000	// block the target thread
	1001	thread_block( target_xp , THREAD_BLOCKED_GLOBAL );
	1002
	1003	// get attached from target flag descriptor
	1004	target_attached = ((hal_remote_lw( target_flags_xp ) & THREAD_FLAG_DETACHED) != 0);
	1005
	1006	// synchronize with the joining thread if the target thread is attached
	1007	if( target_attached && (is_forced == false) )
	1008	{
	1009	// build extended pointers on target thread join fields
	1010	target_join_lock_xp = XPTR( target_cxy , &target_ptr->join_lock );
	1011	target_join_xp_xp = XPTR( target_cxy , &target_ptr->join_xp );
	1012
	1013	// enter critical section
	1014	hal_disable_irq( &save_sr );
	1015
	1016	// take the join_lock in target thread descriptor
	1017	remote_spinlock_lock( target_join_lock_xp );
	1018
	1019	// get join_done from target thread descriptor
	1020	target_join_done = ((hal_remote_lw( target_flags_xp ) & THREAD_FLAG_JOIN_DONE) != 0);
	1021
	1022	if( target_join_done ) // joining thread arrived first => unblock the joining thread
	1023	{
	1024	// get extended pointer on joining thread
	1025	joining_xp = (xptr_t)hal_remote_lwd( target_join_xp_xp );
	1026	joining_ptr = GET_PTR( joining_xp );
	1027	joining_cxy = GET_CXY( joining_xp );
	1028
	1029	// reset the join_done flag in target thread
	1030	hal_remote_atomic_and( target_flags_xp , ~THREAD_FLAG_JOIN_DONE );
	1031
	1032	// unblock the joining thread
	1033	thread_unblock( joining_xp , THREAD_BLOCKED_JOIN );
	1034
	1035	// release the join_lock in target thread descriptor
	1036	remote_spinlock_unlock( target_join_lock_xp );
	1037
	1038	// restore IRQs
	1039	hal_restore_irq( save_sr );
	1040	}
	1041	else // this thread arrived first => register flags and deschedule
	1042	{
	1043	// set the kill_done flag in target thread
	1044	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_KILL_DONE );
	1045
	1046	// block this thread on BLOCKED_JOIN
	1047	thread_block( killer_xp , THREAD_BLOCKED_JOIN );
	1048
	1049	// set extended pointer on killer thread in target thread
	1050	hal_remote_swd( target_join_xp_xp , killer_xp );
	1051
	1052	// release the join_lock in target thread descriptor
	1053	remote_spinlock_unlock( target_join_lock_xp );
	1054
	1055	// deschedule
	1056	sched_yield( "killer thread wait joining thread" );
	1057
	1058	// restore IRQs
	1059	hal_restore_irq( save_sr );
	1060	}
	1061	} // end if attached
	1062
	1063	// set the REQ_DELETE flag in target thread descriptor
	1064	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_REQ_DELETE );
	1065
	1066	#if DEBUG_THREAD_DELETE
	1067	cycle = (uint32_t)hal_get_cycles;
	1068	if( DEBUG_THREAD_DELETE < cycle )
	1069	printk("\n[DBG] %s : killer thread %x exit for target thread %x / cycle %d\n",
	1070	__FUNCTION__, killer_ptr, target_ptr, cycle );
	1071	#endif
	1072
	1073	} // end thread_delete()
	1074
	1075
	1076
[14]	1077	///////////////////////
	1078	void thread_idle_func()
[1]	1079	{
[446]	1080
	1081	#if DEBUG_THREAD_IDLE
	1082	uint32_t cycle;
	1083	#endif
	1084
[1]	1085	while( 1 )
	1086	{
[408]	1087	// unmask IRQs
	1088	hal_enable_irq( NULL );
	1089
[443]	1090	// force core to low-power mode (optional)
	1091	if( CONFIG_THREAD_IDLE_MODE_SLEEP )
[407]	1092	{
[1]	1093
[446]	1094	#if (DEBUG_THREAD_IDLE & 1)
	1095	cycle = (uint32_t)hal_get_cycles;
[438]	1096	if( DEBUG_THREAD_IDLE < cycle )
[446]	1097	printk("\n[DBG] %s : idle thread on core[%x,%d] goes to sleep / cycle %d\n",
	1098	__FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, cycle );
[433]	1099	#endif
[1]	1100
[407]	1101	hal_core_sleep();
[1]	1102
[446]	1103	#if (DEBUG_THREAD_IDLE & 1)
[433]	1104	cycle = (uint32_t)hal_get_cycles;
[438]	1105	if( DEBUG_THREAD_IDLE < cycle )
[446]	1106	printk("\n[DBG] %s : idle thread on core[%x,%d] wake up / cycle %d\n",
[433]	1107	__FUNCTION__, this, local_cxy, this->core->lid, cycle );
	1108	#endif
[407]	1109
	1110	}
[443]	1111
[446]	1112	#if DEBUG_THREAD_IDLE
	1113	sched_display( CURRENT_THREAD->core->lid );
	1114	#endif
	1115
[443]	1116	// search a runable thread
	1117	sched_yield( "IDLE" );
[418]	1118	}
[407]	1119	} // end thread_idle()
[1]	1120
[407]	1121
[16]	1122	/////////////////////////////////////////////////
	1123	void thread_user_time_update( thread_t * thread )
	1124	{
	1125	// TODO
[337]	1126	// printk("\n[WARNING] function %s not implemented\n", __FUNCTION__ );
[16]	1127	}
[1]	1128
[16]	1129	///////////////////////////////////////////////////
	1130	void thread_kernel_time_update( thread_t * thread )
	1131	{
	1132	// TODO
[337]	1133	// printk("\n[WARNING] function %s not implemented\n", __FUNCTION__ );
[16]	1134	}
	1135
[23]	1136	/////////////////////////////////////
	1137	xptr_t thread_get_xptr( pid_t pid,
	1138	trdid_t trdid )
	1139	{
	1140	cxy_t target_cxy; // target thread cluster identifier
	1141	ltid_t target_thread_ltid; // target thread local index
[171]	1142	thread_t * target_thread_ptr; // target thread local pointer
[23]	1143	xptr_t target_process_xp; // extended pointer on target process descriptor
[171]	1144	process_t * target_process_ptr; // local pointer on target process descriptor
[23]	1145	pid_t target_process_pid; // target process identifier
	1146	xlist_entry_t root; // root of list of process in target cluster
	1147	xptr_t lock_xp; // extended pointer on lock protecting this list
[16]	1148
[23]	1149	// get target cluster identifier and local thread identifier
	1150	target_cxy = CXY_FROM_TRDID( trdid );
	1151	target_thread_ltid = LTID_FROM_TRDID( trdid );
	1152
[436]	1153	// check trdid argument
	1154	if( (target_thread_ltid >= CONFIG_THREAD_MAX_PER_CLUSTER) \|\|
	1155	cluster_is_undefined( target_cxy ) ) return XPTR_NULL;
	1156
[23]	1157	// get root of list of process descriptors in target cluster
	1158	hal_remote_memcpy( XPTR( local_cxy , &root ),
	1159	XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ),
	1160	sizeof(xlist_entry_t) );
	1161
[171]	1162	// get extended pointer on lock protecting the list of processes
[23]	1163	lock_xp = XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_lock );
	1164
	1165	// take the lock protecting the list of processes in target cluster
	1166	remote_spinlock_lock( lock_xp );
	1167
	1168	// loop on list of process in target cluster to find the PID process
	1169	xptr_t iter;
	1170	bool_t found = false;
	1171	XLIST_FOREACH( XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ) , iter )
	1172	{
	1173	target_process_xp = XLIST_ELEMENT( iter , process_t , local_list );
	1174	target_process_ptr = (process_t *)GET_PTR( target_process_xp );
	1175	target_process_pid = hal_remote_lw( XPTR( target_cxy , &target_process_ptr->pid ) );
	1176	if( target_process_pid == pid )
	1177	{
	1178	found = true;
	1179	break;
	1180	}
	1181	}
	1182
	1183	// release the lock protecting the list of processes in target cluster
	1184	remote_spinlock_unlock( lock_xp );
	1185
[436]	1186	// check PID found
	1187	if( found == false ) return XPTR_NULL;
[23]	1188
	1189	// get target thread local pointer
	1190	xptr_t xp = XPTR( target_cxy , &target_process_ptr->th_tbl[target_thread_ltid] );
[171]	1191	target_thread_ptr = (thread_t *)hal_remote_lpt( xp );
[23]	1192
[436]	1193	if( target_thread_ptr == NULL ) return XPTR_NULL;
[23]	1194
	1195	return XPTR( target_cxy , target_thread_ptr );
[171]	1196	}
[23]	1197

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