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source: trunk/kernel/kern/thread.c @ 586

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

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