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source: trunk/kernel/kern/thread.c @ 471

Last change on this file since 471 was 469, checked in by alain, 6 years ago
1) Introduce the libsemaphore library. 2) Introduce a small libmath library, required by the "fft" application.. 3) Introduce the multithreaded "fft" application. 4) Fix a bad synchronisation bug in the Copy-On-Write mechanism.
File size: 41.5 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 ) );
[469]	88	return GET_PTR( base_xp );
[315]	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 )
[469]	421	printk("\n[DBG] %s : thread %x in process %x enter / child_process %x / cycle %d\n",
	422	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, child_process->pid, cycle );
[433]	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 );
[469]	430	parent_ptr = 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	{
[469]	540	// get pointers on the page descriptor
[408]	541	xptr_t page_xp = ppm_ppn2page( ppn );
	542	cxy_t page_cxy = GET_CXY( page_xp );
[469]	543	page_t * page_ptr = GET_PTR( page_xp );
	544
	545	// get extended pointers on forks and lock fields
	546	xptr_t forks_xp = XPTR( page_cxy , &page_ptr->forks );
	547	xptr_t lock_xp = XPTR( page_cxy , &page_ptr->lock );
	548
	549	// increment the forks counter
	550	remote_spinlock_lock( lock_xp );
[433]	551	hal_remote_atomic_add( XPTR( page_cxy , &page_ptr->forks ) , 1 );
[469]	552	remote_spinlock_unlock( lock_xp );
[408]	553
[438]	554	#if (DEBUG_THREAD_USER_FORK & 1)
[433]	555	cycle = (uint32_t)hal_get_cycles();
[438]	556	if( DEBUG_THREAD_USER_FORK < cycle )
[469]	557	printk("\n[DBG] %s : thread %x in process %x copied one PTE to child GPT : vpn %x / forks %d\n",
	558	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, vpn,
	559	hal_remote_lw( XPTR( page_cxy , &page_ptr->forks) ) );
[433]	560	#endif
[408]	561
	562	}
	563	}
	564
[433]	565	// set COW flag for all mapped entries of STAK vseg in parent thread GPT
	566	hal_gpt_set_cow( parent_gpt_xp,
	567	vpn_base,
	568	vpn_size );
[408]	569
[438]	570	#if DEBUG_THREAD_USER_FORK
[433]	571	cycle = (uint32_t)hal_get_cycles();
[438]	572	if( DEBUG_THREAD_USER_FORK < cycle )
[469]	573	printk("\n[DBG] %s : thread %x in process %x exit / child_thread %x / cycle %d\n",
	574	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, child_ptr, cycle );
[433]	575	#endif
[407]	576
[1]	577	return 0;
[5]	578
[296]	579	} // end thread_user_fork()
	580
[457]	581	////////////////////////////////////////////////
	582	error_t thread_user_exec( void * entry_func,
	583	uint32_t argc,
	584	char ** argv )
	585	{
	586	thread_t * thread = CURRENT_THREAD;
	587	process_t * process = thread->process;
	588
	589	#if DEBUG_THREAD_USER_EXEC
	590	uint32_t cycle = (uint32_t)hal_get_cycles();
	591	if( DEBUG_THREAD_USER_EXEC < cycle )
	592	printk("\n[DBG] %s : thread %x in process %x enter / cycle %d\n",
	593	__FUNCTION__, thread->trdid, process->pid, cycle );
	594	#endif
	595
	596	assert( (thread->type == THREAD_USER ) , __FUNCTION__, "bad type" );
	597	assert( (thread->signature == THREAD_SIGNATURE) , __FUNCTION__, "bad signature" );
	598	assert( (thread->local_locks == 0) , __FUNCTION__, "bad local locks" );
	599	assert( (thread->remote_locks == 0) , __FUNCTION__, "bad remote locks" );
	600
	601	// re-initialize various thread descriptor fields
	602	thread->quantum = 0; // TODO
	603	thread->ticks_nr = 0; // TODO
	604	thread->time_last_check = 0; // TODO
	605
	606	#if CONFIG_LOCKS_DEBUG
	607	list_root_init( &thread->locks_root );
	608	xlist_root_init( XPTR( local_cxy , &thread->xlocks_root ) );
	609	#endif
	610
	611	thread->entry_func = entry_func;
	612	thread->main_argc = argc;
	613	thread->main_argv = argv;
	614
	615	// the main thread is always detached
	616	thread->flags = THREAD_FLAG_DETACHED;
	617	thread->blocked = 0;
	618	thread->errno = 0;
	619	thread->fork_user = 0; // not inherited
	620	thread->fork_cxy = 0; // not inherited
	621
	622	// reset thread info
	623	memset( &thread->info , 0 , sizeof(thread_info_t) );
	624
	625	// initialize join_lock
	626	remote_spinlock_init( XPTR( local_cxy , &thread->join_lock ) );
	627
	628	// allocate an user stack vseg for main thread
	629	vseg_t * vseg = vmm_create_vseg( process,
	630	VSEG_TYPE_STACK,
	631	0, // size unused
	632	0, // length unused
	633	0, // file_offset unused
	634	0, // file_size unused
	635	XPTR_NULL, // mapper_xp unused
	636	local_cxy );
	637	if( vseg == NULL )
	638	{
	639	printk("\n[ERROR] in %s : cannot create stack vseg for main thread\n", __FUNCTION__ );
	640	return -1;
	641	}
	642
[469]	643	// update user stack in thread descriptor
[457]	644	thread->u_stack_base = vseg->min;
	645	thread->u_stack_size = vseg->max - vseg->min;
	646
	647	// release FPU ownership if required
	648	if( thread->core->fpu_owner == thread ) thread->core->fpu_owner = NULL;
	649
	650	// re-initialize FPU context
	651	hal_fpu_context_init( thread );
	652
	653	#if DEBUG_THREAD_USER_EXEC
	654	cycle = (uint32_t)hal_get_cycles();
	655	if( DEBUG_THREAD_USER_EXEC < cycle )
	656	printk("\n[DBG] %s : thread %x in process %x set CPU context & jump to user code / cycle %d\n",
	657	__FUNCTION__, thread->trdid, process->pid, cycle );
	658	vmm_display( process , true );
	659	#endif
	660
	661	// re-initialize CPU context... and jump to user code
	662	hal_cpu_context_exec( thread );
	663
	664	assert( false, __FUNCTION__, "we should execute this code");
	665
	666	return 0;
	667
	668	} // end thread_user_exec()
	669
[1]	670	/////////////////////////////////////////////////////////
	671	error_t thread_kernel_create( thread_t ** new_thread,
	672	thread_type_t type,
[171]	673	void * func,
	674	void * args,
[1]	675	lid_t core_lid )
	676	{
	677	error_t error;
[14]	678	thread_t * thread; // pointer on new thread descriptor
[1]	679
[407]	680	assert( ( (type == THREAD_IDLE) \|\| (type == THREAD_RPC) \|\| (type == THREAD_DEV) ) ,
	681	__FUNCTION__ , "illegal thread type" );
[1]	682
[171]	683	assert( (core_lid < LOCAL_CLUSTER->cores_nr) ,
[5]	684	__FUNCTION__ , "illegal core_lid" );
[1]	685
[438]	686	#if DEBUG_THREAD_KERNEL_CREATE
[433]	687	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	688	if( DEBUG_THREAD_KERNEL_CREATE < cycle )
[433]	689	printk("\n[DBG] %s : thread %x enter / requested_type %s / cycle %d\n",
	690	__FUNCTION__, CURRENT_THREAD, thread, thread_type_str(type), cycle );
	691	#endif
	692
[171]	693	// allocate memory for new thread descriptor
[14]	694	thread = thread_alloc();
	695
	696	if( thread == NULL ) return ENOMEM;
	697
[171]	698	// initialize thread descriptor
[14]	699	error = thread_init( thread,
	700	&process_zero,
	701	type,
	702	func,
	703	args,
	704	core_lid,
	705	0 , 0 ); // no user stack for a kernel thread
	706
[171]	707	if( error ) // release allocated memory for thread descriptor
[1]	708	{
[185]	709	thread_release( thread );
[457]	710	return ENOMEM;
[1]	711	}
	712
[171]	713	// allocate & initialize CPU context
[457]	714	error = hal_cpu_context_alloc( thread );
	715	if( error )
	716	{
	717	thread_release( thread );
	718	return EINVAL;
	719	}
	720	hal_cpu_context_init( thread );
[14]	721
[457]	722
[438]	723	#if DEBUG_THREAD_KERNEL_CREATE
[433]	724	cycle = (uint32_t)hal_get_cycles();
[438]	725	if( DEBUG_THREAD_KERNEL_CREATE < cycle )
[433]	726	printk("\n[DBG] %s : thread %x exit / new_thread %x / type %s / cycle %d\n",
	727	__FUNCTION__, CURRENT_THREAD, thread, thread_type_str(type), cycle );
	728	#endif
[1]	729
[171]	730	*new_thread = thread;
[1]	731	return 0;
[5]	732
[296]	733	} // end thread_kernel_create()
	734
[457]	735	//////////////////////////////////////////////
	736	void thread_idle_init( thread_t * thread,
	737	thread_type_t type,
	738	void * func,
	739	void * args,
	740	lid_t core_lid )
[14]	741	{
[407]	742	assert( (type == THREAD_IDLE) , __FUNCTION__ , "illegal thread type" );
	743	assert( (core_lid < LOCAL_CLUSTER->cores_nr) , __FUNCTION__ , "illegal core index" );
[14]	744
[457]	745	// initialize thread descriptor
[14]	746	error_t error = thread_init( thread,
	747	&process_zero,
	748	type,
	749	func,
	750	args,
	751	core_lid,
	752	0 , 0 ); // no user stack for a kernel thread
	753
[457]	754	assert( (error == 0), __FUNCTION__, "cannot create thread idle" );
	755
[14]	756	// allocate & initialize CPU context if success
[457]	757	error = hal_cpu_context_alloc( thread );
[171]	758
[457]	759	assert( (error == 0), __FUNCTION__, "cannot allocate CPU context" );
[14]	760
[457]	761	hal_cpu_context_init( thread );
	762
[438]	763	} // end thread_idle_init()
[407]	764
[1]	765	///////////////////////////////////////////////////////////////////////////////////////
	766	// TODO: check that all memory dynamically allocated during thread execution
[440]	767	// has been released, using a cache of mmap requests. [AG]
[1]	768	///////////////////////////////////////////////////////////////////////////////////////
[443]	769	bool_t thread_destroy( thread_t * thread )
[1]	770	{
[409]	771	reg_t save_sr;
[443]	772	bool_t last_thread;
[1]	773
	774	process_t * process = thread->process;
	775	core_t * core = thread->core;
	776
[438]	777	#if DEBUG_THREAD_DESTROY
[433]	778	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	779	if( DEBUG_THREAD_DESTROY < cycle )
[433]	780	printk("\n[DBG] %s : thread %x enter to destroy thread %x in process %x / cycle %d\n",
[450]	781	__FUNCTION__, CURRENT_THREAD, thread->trdid, process->pid, cycle );
[433]	782	#endif
[1]	783
[443]	784	assert( (thread->local_locks == 0) , __FUNCTION__ ,
	785	"local lock not released for thread %x in process %x", thread->trdid, process->pid );
[171]	786
[443]	787	assert( (thread->remote_locks == 0) , __FUNCTION__ ,
	788	"remote lock not released for thread %x in process %x", thread->trdid, process->pid );
[5]	789
[1]	790	// update intrumentation values
[408]	791	process->vmm.pgfault_nr += thread->info.pgfault_nr;
[1]	792
	793	// release memory allocated for CPU context and FPU context
	794	hal_cpu_context_destroy( thread );
[409]	795	if ( thread->type == THREAD_USER ) hal_fpu_context_destroy( thread );
[1]	796
[428]	797	// release FPU ownership if required
[409]	798	hal_disable_irq( &save_sr );
[1]	799	if( core->fpu_owner == thread )
	800	{
	801	core->fpu_owner = NULL;
	802	hal_fpu_disable();
	803	}
[409]	804	hal_restore_irq( save_sr );
[1]	805
[171]	806	// remove thread from process th_tbl[]
[443]	807	last_thread = process_remove_thread( thread );
[1]	808
[438]	809	// update DQDT
	810	dqdt_update_threads( -1 );
[23]	811
[1]	812	// invalidate thread descriptor
	813	thread->signature = 0;
	814
	815	// release memory for thread descriptor
[23]	816	thread_release( thread );
[1]	817
[438]	818	#if DEBUG_THREAD_DESTROY
[433]	819	cycle = (uint32_t)hal_get_cycles();
[438]	820	if( DEBUG_THREAD_DESTROY < cycle )
[450]	821	printk("\n[DBG] %s : thread %x exit / destroyed thread %x in process %x / last %d / cycle %d\n",
	822	__FUNCTION__, CURRENT_THREAD, thread->trdid, process->pid, last_thread / cycle );
[433]	823	#endif
[1]	824
[443]	825	return last_thread;
	826
[407]	827	} // end thread_destroy()
	828
[416]	829	//////////////////////////////////////////////////
	830	inline void thread_set_req_ack( thread_t * target,
	831	uint32_t * rsp_count )
[1]	832	{
[409]	833	reg_t save_sr; // for critical section
	834
[416]	835	// get pointer on target thread scheduler
	836	scheduler_t * sched = &target->core->scheduler;
[409]	837
[416]	838	// wait scheduler ready to handle a new request
	839	while( sched->req_ack_pending ) asm volatile( "nop" );
[409]	840
	841	// enter critical section
	842	hal_disable_irq( &save_sr );
	843
[416]	844	// set request in target thread scheduler
	845	sched->req_ack_pending = true;
[409]	846
[416]	847	// set ack request in target thread "flags"
	848	hal_atomic_or( &target->flags , THREAD_FLAG_REQ_ACK );
[409]	849
[416]	850	// set pointer on responses counter in target thread
	851	target->ack_rsp_count = rsp_count;
[409]	852
	853	// exit critical section
	854	hal_restore_irq( save_sr );
	855
[407]	856	hal_fence();
[171]	857
[416]	858	} // thread_set_req_ack()
[409]	859
[416]	860	/////////////////////////////////////////////////////
	861	inline void thread_reset_req_ack( thread_t * target )
[1]	862	{
[409]	863	reg_t save_sr; // for critical section
	864
	865	// get pointer on target thread scheduler
[416]	866	scheduler_t * sched = &target->core->scheduler;
[409]	867
	868	// check signal pending in scheduler
[416]	869	assert( sched->req_ack_pending , __FUNCTION__ , "no pending signal" );
[409]	870
	871	// enter critical section
	872	hal_disable_irq( &save_sr );
	873
	874	// reset signal in scheduler
[416]	875	sched->req_ack_pending = false;
[409]	876
	877	// reset signal in thread "flags"
[416]	878	hal_atomic_and( &target->flags , ~THREAD_FLAG_REQ_ACK );
[409]	879
	880	// reset pointer on responses counter
[416]	881	target->ack_rsp_count = NULL;
[409]	882
	883	// exit critical section
	884	hal_restore_irq( save_sr );
	885
[407]	886	hal_fence();
[171]	887
[416]	888	} // thread_reset_req_ack()
[409]	889
[1]	890	////////////////////////////////
	891	inline bool_t thread_can_yield()
	892	{
	893	thread_t * this = CURRENT_THREAD;
[367]	894	return (this->local_locks == 0) && (this->remote_locks == 0);
[1]	895	}
	896
[367]	897	/////////////////////////
	898	void thread_check_sched()
[1]	899	{
[338]	900	thread_t * this = CURRENT_THREAD;
[1]	901
[367]	902	if( (this->local_locks == 0) &&
	903	(this->remote_locks == 0) &&
	904	(this->flags & THREAD_FLAG_SCHED) )
	905	{
	906	this->flags &= ~THREAD_FLAG_SCHED;
[408]	907	sched_yield( "delayed scheduling" );
[367]	908	}
[1]	909
[407]	910	} // end thread_check_sched()
	911
[436]	912	//////////////////////////////////////
	913	void thread_block( xptr_t thread_xp,
	914	uint32_t cause )
[407]	915	{
[436]	916	// get thread cluster and local pointer
	917	cxy_t cxy = GET_CXY( thread_xp );
	918	thread_t * ptr = GET_PTR( thread_xp );
	919
[407]	920	// set blocking cause
[436]	921	hal_remote_atomic_or( XPTR( cxy , &ptr->blocked ) , cause );
[407]	922	hal_fence();
	923
[438]	924	#if DEBUG_THREAD_BLOCK
[457]	925	uint32_t cycle = (uint32_t)hal_get_cycles();
	926	process_t * process = hal_remote_lpt( XPTR( cxy , &ptr->process ) );
[438]	927	if( DEBUG_THREAD_BLOCK < cycle )
[457]	928	printk("\n[DBG] %s : thread %x in process %x blocked thread %x in process %x / cause %x\n",
	929	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
	930	ptr->trdid, hal_remote_lw(XPTR( cxy , &process->pid )), cause );
[433]	931	#endif
	932
[407]	933	} // end thread_block()
	934
[433]	935	////////////////////////////////////////////
	936	uint32_t thread_unblock( xptr_t thread_xp,
[407]	937	uint32_t cause )
	938	{
	939	// get thread cluster and local pointer
[433]	940	cxy_t cxy = GET_CXY( thread_xp );
	941	thread_t * ptr = GET_PTR( thread_xp );
[407]	942
	943	// reset blocking cause
	944	uint32_t previous = hal_remote_atomic_and( XPTR( cxy , &ptr->blocked ) , ~cause );
	945	hal_fence();
	946
[438]	947	#if DEBUG_THREAD_BLOCK
[457]	948	uint32_t cycle = (uint32_t)hal_get_cycles();
	949	process_t * process = hal_remote_lpt( XPTR( cxy , &ptr->process ) );
[438]	950	if( DEBUG_THREAD_BLOCK < cycle )
[457]	951	printk("\n[DBG] %s : thread %x in process %x unblocked thread %x in process %x / cause %x\n",
	952	__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid,
	953	ptr->trdid, hal_remote_lw(XPTR( cxy , &process->pid )), cause );
[433]	954	#endif
	955
[446]	956	// return a non zero value if the cause bit is modified
	957	return( previous & cause );
[436]	958
[446]	959	} // end thread_unblock()
[407]	960
[440]	961	//////////////////////////////////////
	962	void thread_delete( xptr_t target_xp,
	963	pid_t pid,
	964	bool_t is_forced )
	965	{
	966	reg_t save_sr; // for critical section
	967	bool_t target_join_done; // joining thread arrived first
	968	bool_t target_attached; // target thread attached
	969	xptr_t killer_xp; // extended pointer on killer thread (this)
	970	thread_t * killer_ptr; // pointer on killer thread (this)
	971	cxy_t target_cxy; // target thread cluster
	972	thread_t * target_ptr; // pointer on target thread
	973	xptr_t target_flags_xp; // extended pointer on target thread <flags>
	974	uint32_t target_flags; // target thread <flags> value
	975	xptr_t target_join_lock_xp; // extended pointer on target thread <join_lock>
	976	xptr_t target_join_xp_xp; // extended pointer on target thread <join_xp>
	977	trdid_t target_trdid; // target thread identifier
	978	ltid_t target_ltid; // target thread local index
	979	xptr_t joining_xp; // extended pointer on joining thread
	980	thread_t * joining_ptr; // pointer on joining thread
	981	cxy_t joining_cxy; // joining thread cluster
	982	cxy_t owner_cxy; // process owner cluster
	983
	984
	985	// get target thread pointers, identifiers, and flags
	986	target_cxy = GET_CXY( target_xp );
	987	target_ptr = GET_PTR( target_xp );
	988	target_trdid = hal_remote_lw( XPTR( target_cxy , &target_ptr->trdid ) );
	989	target_ltid = LTID_FROM_TRDID( target_trdid );
	990	target_flags_xp = XPTR( target_cxy , &target_ptr->flags );
	991	target_flags = hal_remote_lw( target_flags_xp );
	992
	993	// get killer thread pointers
	994	killer_ptr = CURRENT_THREAD;
	995	killer_xp = XPTR( local_cxy , killer_ptr );
	996
	997	#if DEBUG_THREAD_DELETE
	998	uint32_t cycle = (uint32_t)hal_get_cycles;
	999	if( DEBUG_THREAD_DELETE < cycle )
	1000	printk("\n[DBG] %s : killer thread %x enter for target thread %x / cycle %d\n",
	1001	__FUNCTION__, killer_ptr, target_ptr, cycle );
	1002	#endif
	1003
	1004	// target thread cannot be the main thread, because the main thread
	1005	// must be deleted by the parent process sys_wait() function
	1006	owner_cxy = CXY_FROM_PID( pid );
	1007	assert( ((owner_cxy != target_cxy) \|\| (target_ltid != 0)), __FUNCTION__,
	1008	"tharget thread cannot be the main thread\n" );
	1009
	1010	// block the target thread
	1011	thread_block( target_xp , THREAD_BLOCKED_GLOBAL );
	1012
	1013	// get attached from target flag descriptor
	1014	target_attached = ((hal_remote_lw( target_flags_xp ) & THREAD_FLAG_DETACHED) != 0);
	1015
	1016	// synchronize with the joining thread if the target thread is attached
	1017	if( target_attached && (is_forced == false) )
	1018	{
	1019	// build extended pointers on target thread join fields
	1020	target_join_lock_xp = XPTR( target_cxy , &target_ptr->join_lock );
	1021	target_join_xp_xp = XPTR( target_cxy , &target_ptr->join_xp );
	1022
	1023	// enter critical section
	1024	hal_disable_irq( &save_sr );
	1025
	1026	// take the join_lock in target thread descriptor
	1027	remote_spinlock_lock( target_join_lock_xp );
	1028
	1029	// get join_done from target thread descriptor
	1030	target_join_done = ((hal_remote_lw( target_flags_xp ) & THREAD_FLAG_JOIN_DONE) != 0);
	1031
	1032	if( target_join_done ) // joining thread arrived first => unblock the joining thread
	1033	{
	1034	// get extended pointer on joining thread
	1035	joining_xp = (xptr_t)hal_remote_lwd( target_join_xp_xp );
	1036	joining_ptr = GET_PTR( joining_xp );
	1037	joining_cxy = GET_CXY( joining_xp );
	1038
	1039	// reset the join_done flag in target thread
	1040	hal_remote_atomic_and( target_flags_xp , ~THREAD_FLAG_JOIN_DONE );
	1041
	1042	// unblock the joining thread
	1043	thread_unblock( joining_xp , THREAD_BLOCKED_JOIN );
	1044
	1045	// release the join_lock in target thread descriptor
	1046	remote_spinlock_unlock( target_join_lock_xp );
	1047
	1048	// restore IRQs
	1049	hal_restore_irq( save_sr );
	1050	}
	1051	else // this thread arrived first => register flags and deschedule
	1052	{
	1053	// set the kill_done flag in target thread
	1054	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_KILL_DONE );
	1055
	1056	// block this thread on BLOCKED_JOIN
	1057	thread_block( killer_xp , THREAD_BLOCKED_JOIN );
	1058
	1059	// set extended pointer on killer thread in target thread
	1060	hal_remote_swd( target_join_xp_xp , killer_xp );
	1061
	1062	// release the join_lock in target thread descriptor
	1063	remote_spinlock_unlock( target_join_lock_xp );
	1064
	1065	// deschedule
	1066	sched_yield( "killer thread wait joining thread" );
	1067
	1068	// restore IRQs
	1069	hal_restore_irq( save_sr );
	1070	}
	1071	} // end if attached
	1072
	1073	// set the REQ_DELETE flag in target thread descriptor
	1074	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_REQ_DELETE );
	1075
	1076	#if DEBUG_THREAD_DELETE
	1077	cycle = (uint32_t)hal_get_cycles;
	1078	if( DEBUG_THREAD_DELETE < cycle )
	1079	printk("\n[DBG] %s : killer thread %x exit for target thread %x / cycle %d\n",
	1080	__FUNCTION__, killer_ptr, target_ptr, cycle );
	1081	#endif
	1082
	1083	} // end thread_delete()
	1084
	1085
	1086
[14]	1087	///////////////////////
	1088	void thread_idle_func()
[1]	1089	{
[446]	1090
	1091	#if DEBUG_THREAD_IDLE
	1092	uint32_t cycle;
	1093	#endif
	1094
[1]	1095	while( 1 )
	1096	{
[408]	1097	// unmask IRQs
	1098	hal_enable_irq( NULL );
	1099
[443]	1100	// force core to low-power mode (optional)
	1101	if( CONFIG_THREAD_IDLE_MODE_SLEEP )
[407]	1102	{
[1]	1103
[446]	1104	#if (DEBUG_THREAD_IDLE & 1)
	1105	cycle = (uint32_t)hal_get_cycles;
[438]	1106	if( DEBUG_THREAD_IDLE < cycle )
[446]	1107	printk("\n[DBG] %s : idle thread on core[%x,%d] goes to sleep / cycle %d\n",
	1108	__FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, cycle );
[433]	1109	#endif
[1]	1110
[407]	1111	hal_core_sleep();
[1]	1112
[446]	1113	#if (DEBUG_THREAD_IDLE & 1)
[433]	1114	cycle = (uint32_t)hal_get_cycles;
[438]	1115	if( DEBUG_THREAD_IDLE < cycle )
[446]	1116	printk("\n[DBG] %s : idle thread on core[%x,%d] wake up / cycle %d\n",
[433]	1117	__FUNCTION__, this, local_cxy, this->core->lid, cycle );
	1118	#endif
[407]	1119
	1120	}
[443]	1121
[446]	1122	#if DEBUG_THREAD_IDLE
	1123	sched_display( CURRENT_THREAD->core->lid );
	1124	#endif
	1125
[443]	1126	// search a runable thread
	1127	sched_yield( "IDLE" );
[418]	1128	}
[407]	1129	} // end thread_idle()
[1]	1130
[407]	1131
[16]	1132	/////////////////////////////////////////////////
	1133	void thread_user_time_update( thread_t * thread )
	1134	{
	1135	// TODO
[337]	1136	// printk("\n[WARNING] function %s not implemented\n", __FUNCTION__ );
[16]	1137	}
[1]	1138
[16]	1139	///////////////////////////////////////////////////
	1140	void thread_kernel_time_update( thread_t * thread )
	1141	{
	1142	// TODO
[337]	1143	// printk("\n[WARNING] function %s not implemented\n", __FUNCTION__ );
[16]	1144	}
	1145
[23]	1146	/////////////////////////////////////
	1147	xptr_t thread_get_xptr( pid_t pid,
	1148	trdid_t trdid )
	1149	{
	1150	cxy_t target_cxy; // target thread cluster identifier
	1151	ltid_t target_thread_ltid; // target thread local index
[171]	1152	thread_t * target_thread_ptr; // target thread local pointer
[23]	1153	xptr_t target_process_xp; // extended pointer on target process descriptor
[171]	1154	process_t * target_process_ptr; // local pointer on target process descriptor
[23]	1155	pid_t target_process_pid; // target process identifier
	1156	xlist_entry_t root; // root of list of process in target cluster
	1157	xptr_t lock_xp; // extended pointer on lock protecting this list
[16]	1158
[23]	1159	// get target cluster identifier and local thread identifier
	1160	target_cxy = CXY_FROM_TRDID( trdid );
	1161	target_thread_ltid = LTID_FROM_TRDID( trdid );
	1162
[436]	1163	// check trdid argument
	1164	if( (target_thread_ltid >= CONFIG_THREAD_MAX_PER_CLUSTER) \|\|
	1165	cluster_is_undefined( target_cxy ) ) return XPTR_NULL;
	1166
[23]	1167	// get root of list of process descriptors in target cluster
	1168	hal_remote_memcpy( XPTR( local_cxy , &root ),
	1169	XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ),
	1170	sizeof(xlist_entry_t) );
	1171
[171]	1172	// get extended pointer on lock protecting the list of processes
[23]	1173	lock_xp = XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_lock );
	1174
	1175	// take the lock protecting the list of processes in target cluster
	1176	remote_spinlock_lock( lock_xp );
	1177
	1178	// loop on list of process in target cluster to find the PID process
	1179	xptr_t iter;
	1180	bool_t found = false;
	1181	XLIST_FOREACH( XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ) , iter )
	1182	{
	1183	target_process_xp = XLIST_ELEMENT( iter , process_t , local_list );
[469]	1184	target_process_ptr = GET_PTR( target_process_xp );
[23]	1185	target_process_pid = hal_remote_lw( XPTR( target_cxy , &target_process_ptr->pid ) );
	1186	if( target_process_pid == pid )
	1187	{
	1188	found = true;
	1189	break;
	1190	}
	1191	}
	1192
	1193	// release the lock protecting the list of processes in target cluster
	1194	remote_spinlock_unlock( lock_xp );
	1195
[436]	1196	// check PID found
	1197	if( found == false ) return XPTR_NULL;
[23]	1198
	1199	// get target thread local pointer
	1200	xptr_t xp = XPTR( target_cxy , &target_process_ptr->th_tbl[target_thread_ltid] );
[171]	1201	target_thread_ptr = (thread_t *)hal_remote_lpt( xp );
[23]	1202
[436]	1203	if( target_thread_ptr == NULL ) return XPTR_NULL;
[23]	1204
	1205	return XPTR( target_cxy , target_thread_ptr );
[171]	1206	}
[23]	1207

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