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source: trunk/kernel/kern/thread.c @ 374

Last change on this file since 374 was 374, checked in by max@…, 7 years ago
Use panic().
File size: 26.6 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_KERNEL ) return "KER";
	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).
	115	// It can be called by the four functions:
	116	// - thread_user_create()
	117	// - thread_user_fork()
	118	// - thread_kernel_create()
	119	// - thread_user_init()
	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	spinlock_lock( &process->th_lock );
	146	error = process_register_thread( process, thread , &trdid );
	147	spinlock_unlock( &process->th_lock );
	148
[171]	149	if( error )
[1]	150	{
[14]	151	printk("\n[ERROR] in %s : cannot get TRDID\n", __FUNCTION__ );
	152	return EINVAL;
[1]	153	}
[14]	154
[1]	155	// Initialize new thread descriptor
	156	thread->trdid = trdid;
[171]	157	thread->type = type;
[1]	158	thread->quantum = 0; // TODO
	159	thread->ticks_nr = 0; // TODO
	160	thread->time_last_check = 0;
	161	thread->core = &local_cluster->core_tbl[core_lid];
	162	thread->process = process;
	163
	164	thread->local_locks = 0;
	165	list_root_init( &thread->locks_root );
	166
	167	thread->remote_locks = 0;
	168	xlist_root_init( XPTR( local_cxy , &thread->xlocks_root ) );
	169
[171]	170	thread->u_stack_base = u_stack_base;
[1]	171	thread->u_stack_size = u_stack_size;
[171]	172	thread->k_stack_base = (intptr_t)thread;
[14]	173	thread->k_stack_size = CONFIG_THREAD_DESC_SIZE;
[1]	174
	175	thread->entry_func = func; // thread entry point
	176	thread->entry_args = args; // thread function arguments
[171]	177	thread->flags = 0; // all flags reset
[1]	178	thread->signals = 0; // no pending signal
	179	thread->errno = 0; // no error detected
[171]	180	thread->fork_user = 0; // no fork required
[1]	181	thread->fork_cxy = 0;
	182
	183	// thread blocked
	184	thread->blocked = THREAD_BLOCKED_GLOBAL;
	185
	186	// reset children list
	187	xlist_root_init( XPTR( local_cxy , &thread->children_root ) );
	188	thread->children_nr = 0;
	189
	190	// reset sched list and brothers list
	191	list_entry_init( &thread->sched_list );
	192	xlist_entry_init( XPTR( local_cxy , &thread->brothers_list ) );
	193
	194	// reset thread info
	195	memset( &thread->info , 0 , sizeof(thread_info_t) );
	196
	197	// initialise signature
	198	thread->signature = THREAD_SIGNATURE;
	199
	200	// update local DQDT
	201	dqdt_local_update_threads( 1 );
	202
[171]	203	// register new thread in core scheduler
[1]	204	sched_register_thread( thread->core , thread );
	205
	206	return 0;
	207
[296]	208	} // end thread_init()
	209
[1]	210	/////////////////////////////////////////////////////////
[23]	211	error_t thread_user_create( pid_t pid,
	212	void * start_func,
	213	void * start_arg,
[1]	214	pthread_attr_t * attr,
[23]	215	thread_t ** new_thread )
[1]	216	{
	217	error_t error;
	218	thread_t * thread; // pointer on created thread descriptor
	219	process_t * process; // pointer to local process descriptor
	220	lid_t core_lid; // selected core local index
[23]	221	vseg_t * vseg; // stack vseg
[1]	222
[23]	223	thread_dmsg("\n[INFO] %s : enters for process %x\n", __FUNCTION__ , pid );
[5]	224
[23]	225	// get process descriptor local copy
	226	process = process_get_local_copy( pid );
[1]	227
[23]	228	if( process == NULL )
	229	{
	230	printk("\n[ERROR] in %s : cannot get process descriptor %x\n",
	231	__FUNCTION__ , pid );
	232	return ENOMEM;
	233	}
	234
[171]	235	// select a target core in local cluster
[23]	236	if( attr->attributes & PT_ATTR_CORE_DEFINED ) core_lid = attr->lid;
	237	else core_lid = cluster_select_local_core();
[1]	238
	239	// check core local index
[23]	240	if( core_lid >= LOCAL_CLUSTER->cores_nr )
	241	{
	242	printk("\n[ERROR] in %s : illegal core index attribute = %d\n",
	243	__FUNCTION__ , core_lid );
[171]	244
[23]	245	return EINVAL;
	246	}
[1]	247
[171]	248	// allocate a stack from local VMM
[23]	249	vseg = vmm_create_vseg( process, 0 , 0 , VSEG_TYPE_STACK );
[1]	250
[170]	251	if( vseg == NULL )
[23]	252	{
	253	printk("\n[ERROR] in %s : cannot create stack vseg\n", __FUNCTION__ );
	254	return ENOMEM;
[171]	255	}
[23]	256
[171]	257	// allocate memory for thread descriptor
[14]	258	thread = thread_alloc();
[1]	259
[23]	260	if( thread == NULL )
	261	{
	262	printk("\n[ERROR] in %s : cannot create new thread\n", __FUNCTION__ );
	263	vmm_remove_vseg( vseg );
	264	return ENOMEM;
	265	}
[14]	266
[171]	267	// initialize thread descriptor
[14]	268	error = thread_init( thread,
	269	process,
	270	THREAD_USER,
[23]	271	start_func,
	272	start_arg,
[14]	273	core_lid,
[23]	274	vseg->min,
	275	vseg->max - vseg->min );
[14]	276
[171]	277	if( error )
[14]	278	{
[23]	279	printk("\n[ERROR] in %s : cannot initialize new thread\n", __FUNCTION__ );
	280	vmm_remove_vseg( vseg );
	281	thread_release( thread );
[14]	282	return EINVAL;
	283	}
	284
[171]	285	// set LOADABLE flag
[1]	286	thread->flags = THREAD_FLAG_LOADABLE;
[14]	287
	288	// set DETACHED flag if required
[23]	289	if( attr->attributes & PT_ATTR_DETACH ) thread->flags \|= THREAD_FLAG_DETACHED;
[1]	290
[171]	291	// allocate & initialize CPU context
	292	error = hal_cpu_context_create( thread );
[1]	293
[171]	294	if( error )
[23]	295	{
	296	printk("\n[ERROR] in %s : cannot create CPU context\n", __FUNCTION__ );
	297	vmm_remove_vseg( vseg );
	298	thread_release( thread );
	299	return ENOMEM;
	300	}
	301
[171]	302	// allocate & initialize FPU context
	303	error = hal_fpu_context_create( thread );
[23]	304
	305	if( error )
	306	{
	307	printk("\n[ERROR] in %s : cannot create FPU context\n", __FUNCTION__ );
	308	vmm_remove_vseg( vseg );
	309	thread_release( thread );
	310	return ENOMEM;
	311	}
	312
[171]	313	thread_dmsg("\n[INFO] %s : exit / trdid = %x / process %x / core = %d\n",
[5]	314	__FUNCTION__ , thread->trdid , process->pid , core_lid );
[1]	315
	316	*new_thread = thread;
	317	return 0;
[14]	318
[296]	319	} // end thread_user_create()
	320
[23]	321	//////////////////////////////////////////////
	322	error_t thread_user_fork( process_t * process,
	323	thread_t ** new_thread )
[1]	324	{
	325	error_t error;
[14]	326	thread_t * thread; // pointer on new thread descriptor
[1]	327	lid_t core_lid; // selected core local index
[23]	328	vseg_t * vseg; // stack vseg
[1]	329
[14]	330	thread_dmsg("\n[INFO] %s : enters\n", __FUNCTION__ );
[5]	331
[171]	332	// allocate a stack from local VMM
[23]	333	vseg = vmm_create_vseg( process, 0 , 0 , VSEG_TYPE_STACK );
	334
[286]	335	if( vseg == NULL )
[23]	336	{
	337	printk("\n[ERROR] in %s : cannot create stack vseg\n", __FUNCTION__ );
	338	return ENOMEM;
[171]	339	}
[23]	340
[1]	341	// select a target core in local cluster
	342	core_lid = cluster_select_local_core();
	343
	344	// get pointer on calling thread descriptor
	345	thread_t * this = CURRENT_THREAD;
	346
[171]	347	// allocate memory for new thread descriptor
[14]	348	thread = thread_alloc();
[1]	349
[23]	350	if( thread == NULL )
	351	{
	352	printk("\n[ERROR] in %s : cannot allocate new thread\n", __FUNCTION__ );
	353	vmm_remove_vseg( vseg );
	354	return ENOMEM;
	355	}
[14]	356
[171]	357	// initialize thread descriptor
[14]	358	error = thread_init( thread,
	359	process,
	360	THREAD_USER,
	361	this->entry_func,
	362	this->entry_args,
	363	core_lid,
[23]	364	vseg->min,
	365	vseg->max - vseg->min );
[14]	366
[23]	367	if( error )
[14]	368	{
[23]	369	printk("\n[ERROR] in %s : cannot initialize new thread\n", __FUNCTION__ );
	370	vmm_remove_vseg( vseg );
	371	thread_release( thread );
[14]	372	return EINVAL;
	373	}
	374
[1]	375	// set ATTACHED flag if set in this thread
[14]	376	if( this->flags & THREAD_FLAG_DETACHED ) thread->flags = THREAD_FLAG_DETACHED;
[1]	377
[171]	378	// allocate & initialize CPU context from calling thread
	379	error = hal_cpu_context_copy( thread , this );
[1]	380
[23]	381	if( error )
	382	{
	383	printk("\n[ERROR] in %s : cannot create CPU context\n", __FUNCTION__ );
	384	vmm_remove_vseg( vseg );
	385	thread_release( thread );
	386	return ENOMEM;
	387	}
	388
[171]	389	// allocate & initialize FPU context from calling thread
	390	error = hal_fpu_context_copy( thread , this );
[1]	391
[23]	392	if( error )
	393	{
	394	printk("\n[ERROR] in %s : cannot create CPU context\n", __FUNCTION__ );
	395	vmm_remove_vseg( vseg );
	396	thread_release( thread );
	397	return ENOMEM;
	398	}
	399
[171]	400	thread_dmsg("\n[INFO] %s : exit / thread %x for process %x on core %d in cluster %x\n",
[14]	401	__FUNCTION__, thread->trdid, process->pid, core_lid, local_cxy );
[1]	402
[14]	403	*new_thread = thread;
[1]	404	return 0;
[5]	405
[296]	406	} // end thread_user_fork()
	407
[1]	408	/////////////////////////////////////////////////////////
	409	error_t thread_kernel_create( thread_t ** new_thread,
	410	thread_type_t type,
[171]	411	void * func,
	412	void * args,
[1]	413	lid_t core_lid )
	414	{
	415	error_t error;
[14]	416	thread_t * thread; // pointer on new thread descriptor
[1]	417
[296]	418	thread_dmsg("\n[INFO] %s : enter / for type %s on core[%x,%d] / cycle %d\n",
	419	__FUNCTION__ , thread_type_str( type ) , local_cxy , core_lid , hal_time_stamp() );
[1]	420
[171]	421	assert( ( (type == THREAD_KERNEL) \|\| (type == THREAD_RPC) \|\|
[5]	422	(type == THREAD_IDLE) \|\| (type == THREAD_DEV) ) ,
	423	__FUNCTION__ , "illegal thread type" );
[1]	424
[171]	425	assert( (core_lid < LOCAL_CLUSTER->cores_nr) ,
[5]	426	__FUNCTION__ , "illegal core_lid" );
[1]	427
[171]	428	// allocate memory for new thread descriptor
[14]	429	thread = thread_alloc();
	430
	431	if( thread == NULL ) return ENOMEM;
	432
[171]	433	// initialize thread descriptor
[14]	434	error = thread_init( thread,
	435	&process_zero,
	436	type,
	437	func,
	438	args,
	439	core_lid,
	440	0 , 0 ); // no user stack for a kernel thread
	441
[171]	442	if( error ) // release allocated memory for thread descriptor
[1]	443	{
[185]	444	thread_release( thread );
[14]	445	return EINVAL;
[1]	446	}
	447
[171]	448	// allocate & initialize CPU context
	449	hal_cpu_context_create( thread );
[14]	450
[296]	451	thread_dmsg("\n[INFO] %s : exit / trdid = %x / type = %s / core = [%x,%d] / cycle %d\n",
	452	__FUNCTION__ , thread->trdid , thread_type_str(type) ,
	453	local_cxy , core_lid , hal_time_stamp() );
[1]	454
[171]	455	*new_thread = thread;
[1]	456	return 0;
[5]	457
[296]	458	} // end thread_kernel_create()
	459
[14]	460	///////////////////////////////////////////////////
	461	error_t thread_kernel_init( thread_t * thread,
	462	thread_type_t type,
[171]	463	void * func,
	464	void * args,
[14]	465	lid_t core_lid )
	466	{
[171]	467	assert( ( (type == THREAD_KERNEL) \|\| (type == THREAD_RPC) \|\|
[14]	468	(type == THREAD_IDLE) \|\| (type == THREAD_DEV) ) ,
	469	__FUNCTION__ , "illegal thread type" );
[1]	470
[171]	471	if( core_lid >= LOCAL_CLUSTER->cores_nr )
[14]	472	{
[374]	473	panic("illegal core_lid / cores = %d / lid = %d / cxy = %x",
[373]	474	LOCAL_CLUSTER->cores_nr , core_lid , local_cxy );
[14]	475	}
	476
	477	error_t error = thread_init( thread,
	478	&process_zero,
	479	type,
	480	func,
	481	args,
	482	core_lid,
	483	0 , 0 ); // no user stack for a kernel thread
	484
	485	// allocate & initialize CPU context if success
	486	if( error == 0 ) hal_cpu_context_create( thread );
[171]	487
[14]	488	return error;
[171]	489	}
[14]	490
[1]	491	///////////////////////////////////////////////////////////////////////////////////////
	492	// TODO: check that all memory dynamically allocated during thread execution
	493	// has been released, using a cache of mmap and malloc requests. [AG]
	494	///////////////////////////////////////////////////////////////////////////////////////
	495	void thread_destroy( thread_t * thread )
	496	{
	497	uint32_t tm_start;
	498	uint32_t tm_end;
[60]	499	reg_t state;
[1]	500
	501	process_t * process = thread->process;
	502	core_t * core = thread->core;
	503
[5]	504	thread_dmsg("\n[INFO] %s : enters for thread %x in process %x / type = %s\n",
	505	__FUNCTION__ , thread->trdid , process->pid , thread_type_str( thread->type ) );
[1]	506
[5]	507	assert( (thread->children_nr == 0) , __FUNCTION__ , "still attached children" );
	508
	509	assert( (thread->local_locks == 0) , __FUNCTION__ , "all local locks not released" );
[171]	510
[5]	511	assert( (thread->remote_locks == 0) , __FUNCTION__ , "all remote locks not released" );
	512
[101]	513	tm_start = hal_get_cycles();
[1]	514
	515	// update intrumentation values
	516	uint32_t pgfaults = thread->info.pgfault_nr;
	517	uint32_t u_errors = thread->info.u_err_nr;
	518	uint32_t m_errors = thread->info.m_err_nr;
	519
	520	process->vmm.pgfault_nr += pgfaults;
	521	process->vmm.u_err_nr += u_errors;
	522	process->vmm.m_err_nr += m_errors;
	523
	524	// release memory allocated for CPU context and FPU context
	525	hal_cpu_context_destroy( thread );
	526	hal_fpu_context_destroy( thread );
	527
	528	// release FPU if required
	529	// TODO This should be done before calling thread_destroy()
	530	hal_disable_irq( &state );
	531	if( core->fpu_owner == thread )
	532	{
	533	core->fpu_owner = NULL;
	534	hal_fpu_disable();
	535	}
	536	hal_restore_irq( state );
	537
[171]	538	// remove thread from process th_tbl[]
[1]	539	// TODO This should be done before calling thread_destroy()
	540	ltid_t ltid = LTID_FROM_TRDID( thread->trdid );
	541
	542	spinlock_lock( &process->th_lock );
	543	process->th_tbl[ltid] = XPTR_NULL;
	544	process->th_nr--;
	545	spinlock_unlock( &process->th_lock );
	546
[23]	547	// update local DQDT
	548	dqdt_local_update_threads( -1 );
	549
[1]	550	// invalidate thread descriptor
	551	thread->signature = 0;
	552
	553	// release memory for thread descriptor
[23]	554	thread_release( thread );
[1]	555
[101]	556	tm_end = hal_get_cycles();
[1]	557
[5]	558	thread_dmsg("\n[INFO] %s : exit for thread %x in process %x / duration = %d\n",
	559	__FUNCTION__, thread->trdid , process->pid , tm_end - tm_start );
[171]	560	}
[1]	561
	562	/////////////////////////////////////////////////
	563	void thread_child_parent_link( xptr_t xp_parent,
	564	xptr_t xp_child )
	565	{
[171]	566	// get extended pointers on children list root
	567	cxy_t parent_cxy = GET_CXY( xp_parent );
[1]	568	thread_t * parent_ptr = (thread_t *)GET_PTR( xp_parent );
	569	xptr_t root = XPTR( parent_cxy , &parent_ptr->children_root );
	570
[171]	571	// get extended pointer on children list entry
	572	cxy_t child_cxy = GET_CXY( xp_child );
[1]	573	thread_t * child_ptr = (thread_t *)GET_PTR( xp_child );
	574	xptr_t entry = XPTR( child_cxy , &child_ptr->brothers_list );
	575
	576	// set the link
	577	xlist_add_first( root , entry );
	578	hal_remote_atomic_add( XPTR( parent_cxy , &parent_ptr->children_nr ) , 1 );
[171]	579	}
[1]	580
	581	///////////////////////////////////////////////////
	582	void thread_child_parent_unlink( xptr_t xp_parent,
	583	xptr_t xp_child )
	584	{
	585	// get extended pointer on children list lock
[171]	586	cxy_t parent_cxy = GET_CXY( xp_parent );
[1]	587	thread_t * parent_ptr = (thread_t *)GET_PTR( xp_parent );
	588	xptr_t lock = XPTR( parent_cxy , &parent_ptr->children_lock );
	589
[171]	590	// get extended pointer on children list entry
	591	cxy_t child_cxy = GET_CXY( xp_child );
[1]	592	thread_t * child_ptr = (thread_t *)GET_PTR( xp_child );
	593	xptr_t entry = XPTR( child_cxy , &child_ptr->brothers_list );
	594
	595	// get the lock
	596	remote_spinlock_lock( lock );
	597
	598	// remove the link
	599	xlist_unlink( entry );
	600	hal_remote_atomic_add( XPTR( parent_cxy , &parent_ptr->children_nr ) , -1 );
[171]	601
[1]	602	// release the lock
	603	remote_spinlock_unlock( lock );
	604	}
	605
	606	/////////////////////////////////////////////////
	607	inline void thread_set_signal( thread_t * thread,
	608	uint32_t mask )
	609	{
	610	hal_atomic_or( &thread->signals , mask );
	611	}
[171]	612
[1]	613	///////////////////////////////////////////////////
	614	inline void thread_reset_signal( thread_t * thread,
	615	uint32_t mask )
	616	{
	617	hal_atomic_and( &thread->signals , ~mask );
	618	}
[171]	619
[1]	620	//////////////////////////////////
	621	inline bool_t thread_is_joinable()
	622	{
	623	thread_t * this = CURRENT_THREAD;
	624	return( (this->brothers_list.next != XPTR_NULL) &&
	625	(this->brothers_list.pred != XPTR_NULL) );
	626	}
	627
	628	//////////////////////////////////
	629	inline bool_t thread_is_runnable()
	630	{
	631	thread_t * this = CURRENT_THREAD;
	632	return( this->blocked == 0 );
	633	}
	634
	635	////////////////////////////////
	636	inline bool_t thread_can_yield()
	637	{
	638	thread_t * this = CURRENT_THREAD;
[367]	639	return (this->local_locks == 0) && (this->remote_locks == 0);
[1]	640	}
	641
[367]	642	/////////////////////////
	643	void thread_check_sched()
[1]	644	{
[338]	645	thread_t * this = CURRENT_THREAD;
[1]	646
[367]	647	if( (this->local_locks == 0) &&
	648	(this->remote_locks == 0) &&
	649	(this->flags & THREAD_FLAG_SCHED) )
	650	{
	651	this->flags &= ~THREAD_FLAG_SCHED;
[338]	652	sched_yield( NULL );
[367]	653	}
[1]	654	}
	655
	656	/////////////////////
	657	error_t thread_exit()
	658	{
[60]	659	reg_t sr_save;
[1]	660
	661	thread_t * this = CURRENT_THREAD;
	662
	663	// test if this thread can be descheduled
	664	if( !thread_can_yield() )
	665	{
	666	printk("ERROR in %s : thread %x in process %x on core %d in cluster %x\n"
	667	" did not released all locks\n",
	668	__FUNCTION__ , this->trdid , this->process->pid ,
	669	CURRENT_CORE->lid , local_cxy );
	670	return EINVAL;
	671	}
	672
	673	if( this->flags & THREAD_FLAG_DETACHED )
	674	{
	675	// if detached set signal and set blocking cause atomically
	676	hal_disable_irq( &sr_save );
	677	thread_set_signal( this , THREAD_SIG_KILL );
	678	thread_block( this , THREAD_BLOCKED_EXIT );
	679	hal_restore_irq( sr_save );
	680	}
[171]	681	else
[1]	682	{
[171]	683	// if attached, set blocking cause
[1]	684	thread_block( this , THREAD_BLOCKED_EXIT );
	685	}
	686
	687	// deschedule
[296]	688	sched_yield( NULL );
[1]	689	return 0;
[171]	690	}
[1]	691
	692	/////////////////////////////////////
	693	void thread_block( thread_t * thread,
	694	uint32_t cause )
	695	{
[171]	696	// set blocking cause
[1]	697	hal_atomic_or( &thread->blocked , cause );
[171]	698	}
[1]	699
	700	////////////////////////////////////
	701	void thread_unblock( xptr_t thread,
	702	uint32_t cause )
	703	{
	704	// get thread cluster and local pointer
[171]	705	cxy_t cxy = GET_CXY( thread );
[1]	706	thread_t * ptr = (thread_t *)GET_PTR( thread );
	707
	708	// reset blocking cause
	709	hal_remote_atomic_and( XPTR( cxy , &ptr->blocked ) , ~cause );
[171]	710	}
[1]	711
	712	/////////////////////////////////////
	713	void thread_kill( thread_t * target )
	714	{
	715	// set SIG_KILL signal in target thread descriptor
	716	thread_set_signal( target , THREAD_SIG_KILL );
	717
	718	// set the global blocked bit in target thread descriptor.
	719	thread_block( target , THREAD_BLOCKED_GLOBAL );
	720
[188]	721	// send an IPI to schedule the target thread core.
	722	dev_pic_send_ipi( local_cxy , target->core->lid );
[171]	723	}
[1]	724
[14]	725	///////////////////////
	726	void thread_idle_func()
[1]	727	{
[68]	728	#if CONFIG_IDLE_DEBUG
[14]	729	lid_t lid = CURRENT_CORE->lid;
[68]	730	#endif
[14]	731
[1]	732	while( 1 )
	733	{
[50]	734	idle_dmsg("\n[INFO] %s : core[%x][%d] goes to sleep at cycle %d\n",
[101]	735	__FUNCTION__ , local_cxy , lid , hal_get_cycles() );
[1]	736
	737	// force core to sleeping state
[373]	738	//hal_core_sleep();
[1]	739
[50]	740	idle_dmsg("\n[INFO] %s : core[%x][%d] wake up at cycle %d\n",
[101]	741	__FUNCTION__ , local_cxy , lid , hal_get_cycles() );
[1]	742
[14]	743	// force scheduling
[296]	744	sched_yield( NULL );
[1]	745	}
[171]	746	}
[1]	747
[16]	748	/////////////////////////////////////////////////
	749	void thread_user_time_update( thread_t * thread )
	750	{
	751	// TODO
[337]	752	// printk("\n[WARNING] function %s not implemented\n", __FUNCTION__ );
[16]	753	}
[1]	754
[16]	755	///////////////////////////////////////////////////
	756	void thread_kernel_time_update( thread_t * thread )
	757	{
	758	// TODO
[337]	759	// printk("\n[WARNING] function %s not implemented\n", __FUNCTION__ );
[16]	760	}
	761
	762	////////////////////////////////////////////////
[23]	763	void thread_signals_handle( thread_t * thread )
[16]	764	{
	765	// TODO
[337]	766	// printk("\n[WARNING] function %s not implemented\n", __FUNCTION__ );
[16]	767	}
	768
[23]	769	/////////////////////////////////////
	770	xptr_t thread_get_xptr( pid_t pid,
	771	trdid_t trdid )
	772	{
	773	cxy_t target_cxy; // target thread cluster identifier
	774	ltid_t target_thread_ltid; // target thread local index
[171]	775	thread_t * target_thread_ptr; // target thread local pointer
[23]	776	xptr_t target_process_xp; // extended pointer on target process descriptor
[171]	777	process_t * target_process_ptr; // local pointer on target process descriptor
[23]	778	pid_t target_process_pid; // target process identifier
	779	xlist_entry_t root; // root of list of process in target cluster
	780	xptr_t lock_xp; // extended pointer on lock protecting this list
[16]	781
[23]	782	// get target cluster identifier and local thread identifier
	783	target_cxy = CXY_FROM_TRDID( trdid );
	784	target_thread_ltid = LTID_FROM_TRDID( trdid );
	785
	786	// get root of list of process descriptors in target cluster
	787	hal_remote_memcpy( XPTR( local_cxy , &root ),
	788	XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ),
	789	sizeof(xlist_entry_t) );
	790
[171]	791	// get extended pointer on lock protecting the list of processes
[23]	792	lock_xp = XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_lock );
	793
	794	// take the lock protecting the list of processes in target cluster
	795	remote_spinlock_lock( lock_xp );
	796
	797	// loop on list of process in target cluster to find the PID process
	798	xptr_t iter;
	799	bool_t found = false;
	800	XLIST_FOREACH( XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ) , iter )
	801	{
	802	target_process_xp = XLIST_ELEMENT( iter , process_t , local_list );
	803	target_process_ptr = (process_t *)GET_PTR( target_process_xp );
	804	target_process_pid = hal_remote_lw( XPTR( target_cxy , &target_process_ptr->pid ) );
	805	if( target_process_pid == pid )
	806	{
	807	found = true;
	808	break;
	809	}
	810	}
	811
	812	// release the lock protecting the list of processes in target cluster
	813	remote_spinlock_unlock( lock_xp );
	814
	815	// check target thread found
	816	if( found == false )
	817	{
	818	return XPTR_NULL;
	819	}
	820
	821	// get target thread local pointer
	822	xptr_t xp = XPTR( target_cxy , &target_process_ptr->th_tbl[target_thread_ltid] );
[171]	823	target_thread_ptr = (thread_t *)hal_remote_lpt( xp );
[23]	824
	825	if( target_thread_ptr == NULL )
	826	{
	827	return XPTR_NULL;
	828	}
	829
	830	return XPTR( target_cxy , target_thread_ptr );
[171]	831	}
[23]	832

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