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source: trunk/kernel/kern/thread.c @ 617

Last change on this file since 617 was 611, checked in by alain, 6 years ago
Introduce sigificant modifs in VFS to support the <ls> command, and the . and .. directories entries.
File size: 49.2 KB

Rev	Line
[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	/////////////////////////////////////////////////////////////////////////////////////
[593]	126	// @ thread : pointer on local thread descriptor
	127	// @ process : pointer on local process descriptor.
[14]	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
[593]	150	uint32_t cycle = (uint32_t)hal_get_cycles();
	151	thread_t * this = CURRENT_THREAD;
[564]	152	if( DEBUG_THREAD_INIT < cycle )
[593]	153	printk("\n[%s] thread[%x,%x] enter for thread %x in process %x / cycle %d\n",
	154	__FUNCTION__, this->process->pid, this->trdid, 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 )
[593]	231	printk("\n[%s] thread[%x,%x] exit for thread %x in process %x / cycle %d\n",
	232	__FUNCTION__, this->process->pid, this->trdid, thread, process->pid, cycle );
[443]	233	#endif
	234
[1]	235	return 0;
	236
[296]	237	} // end thread_init()
	238
[1]	239	/////////////////////////////////////////////////////////
[23]	240	error_t thread_user_create( pid_t pid,
	241	void * start_func,
	242	void * start_arg,
[1]	243	pthread_attr_t * attr,
[23]	244	thread_t ** new_thread )
[1]	245	{
	246	error_t error;
	247	thread_t * thread; // pointer on created thread descriptor
	248	process_t * process; // pointer to local process descriptor
	249	lid_t core_lid; // selected core local index
[23]	250	vseg_t * vseg; // stack vseg
[1]	251
[593]	252	assert( (attr != NULL) , "pthread attributes must be defined" );
[5]	253
[438]	254	#if DEBUG_THREAD_USER_CREATE
[593]	255	thread_t * this = CURRENT_THREAD;
	256	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	257	if( DEBUG_THREAD_USER_CREATE < cycle )
[593]	258	printk("\n[%s] thread[%x,%x] enter in cluster %x for process %x / cycle %d\n",
	259	__FUNCTION__, this->process->pid , this->trdid , local_cxy , pid , 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 )
[593]	274	printk("\n[%s] process descriptor = %x for process %x in cluster %x\n",
[443]	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 )
[593]	296	printk("\n[%s] core[%x,%d] selected\n",
[443]	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 )
[593]	318	printk("\n[%s] stack vseg created / vpn_base %x / %d pages\n",
[457]	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__ );
[611]	328	vmm_delete_vseg( process->pid , vseg->min );
[23]	329	return ENOMEM;
	330	}
[14]	331
[443]	332	#if( DEBUG_THREAD_USER_CREATE & 1)
	333	if( DEBUG_THREAD_USER_CREATE < cycle )
[593]	334	printk("\n[%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__ );
[611]	350	vmm_delete_vseg( process->pid , vseg->min );
[23]	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 )
[593]	357	printk("\n[%s] new thread descriptor initialised / trdid %x\n",
[457]	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__ );
[611]	371	vmm_delete_vseg( process->pid , vseg->min );
[23]	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__ );
[611]	381	vmm_delete_vseg( process->pid , vseg->min );
[23]	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 )
[593]	389	printk("\n[%s] CPU & FPU contexts created\n",
[457]	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 )
[593]	397	printk("\n[%s] thread[%x,%x] exit / new_thread %x / core %d / cycle %d\n",
	398	__FUNCTION__, this->process->pid , this->trdid , 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
[593]	432	uint32_t cycle = (uint32_t)hal_get_cycles();
	433	thread_t * this = CURRENT_THREAD;
[438]	434	if( DEBUG_THREAD_USER_FORK < cycle )
[593]	435	printk("\n[%s] thread[%x,%x] enter / child_process %x / cycle %d\n",
	436	__FUNCTION__, this->process->pid, this->trdid, child_process->pid, cycle );
[433]	437	#endif
[408]	438
[1]	439	// select a target core in local cluster
	440	core_lid = cluster_select_local_core();
	441
[408]	442	// get cluster and local pointer on parent thread descriptor
	443	parent_cxy = GET_CXY( parent_thread_xp );
[469]	444	parent_ptr = GET_PTR( parent_thread_xp );
[1]	445
[408]	446	// get relevant fields from parent thread
[428]	447	func = (void *) hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->entry_func ));
	448	args = (void *) hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->entry_args ));
	449	base = (intptr_t)hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->u_stack_base ));
[564]	450	size = (uint32_t)hal_remote_l32 ( XPTR( parent_cxy , &parent_ptr->u_stack_size ));
	451	flags = hal_remote_l32 ( XPTR( parent_cxy , &parent_ptr->flags ));
[428]	452	uzone = (reg_t *) hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->uzone_current ));
[1]	453
[408]	454	vpn_base = base >> CONFIG_PPM_PAGE_SHIFT;
	455	vpn_size = size >> CONFIG_PPM_PAGE_SHIFT;
	456
	457	// get pointer on parent process in parent thread cluster
	458	parent_process = (process_t *)hal_remote_lpt( XPTR( parent_cxy,
	459	&parent_ptr->process ) );
	460
	461	// get extended pointer on parent GPT in parent thread cluster
	462	parent_gpt_xp = XPTR( parent_cxy , &parent_process->vmm.gpt );
	463
	464	// allocate memory for child thread descriptor
	465	child_ptr = thread_alloc();
	466	if( child_ptr == NULL )
[23]	467	{
	468	printk("\n[ERROR] in %s : cannot allocate new thread\n", __FUNCTION__ );
[408]	469	return -1;
[23]	470	}
[14]	471
[171]	472	// initialize thread descriptor
[408]	473	error = thread_init( child_ptr,
	474	child_process,
[14]	475	THREAD_USER,
[408]	476	func,
	477	args,
[14]	478	core_lid,
[408]	479	base,
	480	size );
[23]	481	if( error )
[14]	482	{
[408]	483	printk("\n[ERROR] in %s : cannot initialize child thread\n", __FUNCTION__ );
	484	thread_release( child_ptr );
[14]	485	return EINVAL;
	486	}
	487
[564]	488	#if (DEBUG_THREAD_USER_FORK & 1)
	489	if( DEBUG_THREAD_USER_FORK < cycle )
[593]	490	printk("\n[%s] thread[%x,%x] initialised thread %x in process %x\n",
	491	__FUNCTION__, this->process->pid, this->trdid, child_ptr->trdid, child_process->pid );
[564]	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 )
[593]	524	printk("\n[%s] thread[%x,%x] created CPU & FPU contexts for thread %x in process %x\n",
	525	__FUNCTION__, this->process->pid, this->trdid, child_ptr->trdid, child_process->pid );
[564]	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
[611]	540	vmm_attach_vseg_to_vsl( &child_process->vmm , vseg );
[408]	541
[564]	542	#if (DEBUG_THREAD_USER_FORK & 1)
	543	if( DEBUG_THREAD_USER_FORK < cycle )
[593]	544	printk("\n[%s] thread[%x,%x] created stack vseg for thread %x in process %x\n",
	545	__FUNCTION__, this->process->pid, this->trdid, child_ptr->trdid, child_process->pid );
[564]	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	{
[611]	562	vmm_detach_vseg_from_vsl( &child_process->vmm , vseg );
[408]	563	thread_release( child_ptr );
	564	printk("\n[ERROR] in %s : cannot update child GPT\n", __FUNCTION__ );
	565	return -1;
	566	}
	567
[433]	568	// increment pending forks counter for the page if mapped
[408]	569	if( mapped )
	570	{
[469]	571	// get pointers on the page descriptor
[408]	572	xptr_t page_xp = ppm_ppn2page( ppn );
	573	cxy_t page_cxy = GET_CXY( page_xp );
[469]	574	page_t * page_ptr = GET_PTR( page_xp );
	575
	576	// get extended pointers on forks and lock fields
	577	xptr_t forks_xp = XPTR( page_cxy , &page_ptr->forks );
	578	xptr_t lock_xp = XPTR( page_cxy , &page_ptr->lock );
	579
[564]	580	// get lock protecting page
	581	remote_busylock_acquire( lock_xp );
	582
	583	// increment the forks counter in page descriptor
[473]	584	hal_remote_atomic_add( forks_xp , 1 );
[408]	585
[564]	586	// release lock protecting page
	587	remote_busylock_release( lock_xp );
	588
[438]	589	#if (DEBUG_THREAD_USER_FORK & 1)
[433]	590	cycle = (uint32_t)hal_get_cycles();
[438]	591	if( DEBUG_THREAD_USER_FORK < cycle )
[593]	592	printk("\n[%s] thread[%x,%x] copied one PTE to child GPT : vpn %x / forks %d\n",
	593	__FUNCTION__, this->process->pid, this->trdid,
	594	vpn, hal_remote_l32( XPTR( page_cxy , &page_ptr->forks) ) );
[433]	595	#endif
[408]	596
	597	}
	598	}
	599
[433]	600	// set COW flag for all mapped entries of STAK vseg in parent thread GPT
	601	hal_gpt_set_cow( parent_gpt_xp,
	602	vpn_base,
	603	vpn_size );
[408]	604
[438]	605	#if DEBUG_THREAD_USER_FORK
[433]	606	cycle = (uint32_t)hal_get_cycles();
[438]	607	if( DEBUG_THREAD_USER_FORK < cycle )
[593]	608	printk("\n[%s] thread[%x,%x] exit / child_thread %x / cycle %d\n",
	609	__FUNCTION__, this->process->pid, this->trdid, child_ptr, cycle );
[433]	610	#endif
[407]	611
[1]	612	return 0;
[5]	613
[296]	614	} // end thread_user_fork()
	615
[457]	616	////////////////////////////////////////////////
	617	error_t thread_user_exec( void * entry_func,
	618	uint32_t argc,
	619	char ** argv )
	620	{
	621	thread_t * thread = CURRENT_THREAD;
	622	process_t * process = thread->process;
	623
	624	#if DEBUG_THREAD_USER_EXEC
	625	uint32_t cycle = (uint32_t)hal_get_cycles();
	626	if( DEBUG_THREAD_USER_EXEC < cycle )
[593]	627	printk("\n[%s] thread[%x,%x] enter / cycle %d\n",
	628	__FUNCTION__, process->pid, thread->trdid, cycle );
[457]	629	#endif
	630
[564]	631	// check parent thread attributes
	632	assert( (thread->type == THREAD_USER ) , "bad type" );
	633	assert( (thread->signature == THREAD_SIGNATURE) , "bad signature" );
	634	assert( (thread->busylocks == 0) , "bad busylocks" );
[457]	635
	636	// re-initialize various thread descriptor fields
	637	thread->quantum = 0; // TODO
	638	thread->ticks_nr = 0; // TODO
	639	thread->time_last_check = 0; // TODO
	640
	641	thread->entry_func = entry_func;
	642	thread->main_argc = argc;
	643	thread->main_argv = argv;
	644
	645	// the main thread is always detached
	646	thread->flags = THREAD_FLAG_DETACHED;
	647	thread->blocked = 0;
	648	thread->errno = 0;
	649	thread->fork_user = 0; // not inherited
	650	thread->fork_cxy = 0; // not inherited
	651
[564]	652	// re-initialize busylocks counters
	653	thread->busylocks = 0;
	654
[457]	655	// reset thread info
	656	memset( &thread->info , 0 , sizeof(thread_info_t) );
	657
[564]	658	// re-initialize join_lock
	659	remote_busylock_init( XPTR( local_cxy , &thread->join_lock ), LOCK_THREAD_JOIN );
[457]	660
	661	// allocate an user stack vseg for main thread
	662	vseg_t * vseg = vmm_create_vseg( process,
	663	VSEG_TYPE_STACK,
	664	0, // size unused
	665	0, // length unused
	666	0, // file_offset unused
	667	0, // file_size unused
	668	XPTR_NULL, // mapper_xp unused
	669	local_cxy );
	670	if( vseg == NULL )
	671	{
	672	printk("\n[ERROR] in %s : cannot create stack vseg for main thread\n", __FUNCTION__ );
	673	return -1;
	674	}
	675
[469]	676	// update user stack in thread descriptor
[457]	677	thread->u_stack_base = vseg->min;
	678	thread->u_stack_size = vseg->max - vseg->min;
	679
	680	// release FPU ownership if required
	681	if( thread->core->fpu_owner == thread ) thread->core->fpu_owner = NULL;
	682
	683	// re-initialize FPU context
	684	hal_fpu_context_init( thread );
	685
	686	#if DEBUG_THREAD_USER_EXEC
	687	cycle = (uint32_t)hal_get_cycles();
	688	if( DEBUG_THREAD_USER_EXEC < cycle )
[593]	689	printk("\n[%s] thread[%x,%x] set CPU context & jump to user code / cycle %d\n",
	690	__FUNCTION__, process->pid, thread->trdid, cycle );
[457]	691	vmm_display( process , true );
	692	#endif
	693
	694	// re-initialize CPU context... and jump to user code
	695	hal_cpu_context_exec( thread );
	696
[564]	697	assert( false, "we should not execute this code");
[457]	698
	699	return 0;
	700
	701	} // end thread_user_exec()
	702
[1]	703	/////////////////////////////////////////////////////////
	704	error_t thread_kernel_create( thread_t ** new_thread,
	705	thread_type_t type,
[171]	706	void * func,
	707	void * args,
[1]	708	lid_t core_lid )
	709	{
	710	error_t error;
[14]	711	thread_t * thread; // pointer on new thread descriptor
[1]	712
[593]	713	thread_t * this = CURRENT_THREAD;
[1]	714
[593]	715	assert( ( (type == THREAD_IDLE) \|\| (type == THREAD_RPC) \|\| (type == THREAD_DEV) ) ,
	716	"illegal thread type" );
[1]	717
[593]	718	assert( (core_lid < LOCAL_CLUSTER->cores_nr) ,
	719	"illegal core_lid" );
	720
[438]	721	#if DEBUG_THREAD_KERNEL_CREATE
[593]	722	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	723	if( DEBUG_THREAD_KERNEL_CREATE < cycle )
[593]	724	printk("\n[%s] thread[%x,%x] enter / requested_type %s / cycle %d\n",
	725	__FUNCTION__, this->process->pid, this->trdid, thread_type_str(type), cycle );
[433]	726	#endif
	727
[171]	728	// allocate memory for new thread descriptor
[14]	729	thread = thread_alloc();
	730
[581]	731	if( thread == NULL )
	732	{
	733	printk("\n[ERROR] in %s : thread %x in process %x\n"
	734	" no memory for thread descriptor\n",
[593]	735	__FUNCTION__, this->trdid, this->process->pid );
[581]	736	return ENOMEM;
	737	}
[14]	738
[171]	739	// initialize thread descriptor
[14]	740	error = thread_init( thread,
	741	&process_zero,
	742	type,
	743	func,
	744	args,
	745	core_lid,
	746	0 , 0 ); // no user stack for a kernel thread
	747
[171]	748	if( error ) // release allocated memory for thread descriptor
[1]	749	{
[581]	750	printk("\n[ERROR] in %s : thread %x in process %x\n"
	751	" cannot initialize thread descriptor\n",
[593]	752	__FUNCTION__, this->trdid, this->process->pid );
[185]	753	thread_release( thread );
[457]	754	return ENOMEM;
[1]	755	}
	756
[171]	757	// allocate & initialize CPU context
[457]	758	error = hal_cpu_context_alloc( thread );
[581]	759
[457]	760	if( error )
	761	{
[581]	762	printk("\n[ERROR] in %s : thread %x in process %x\n"
[593]	763	" cannot create CPU context\n",
	764	__FUNCTION__, this->trdid, this->process->pid );
[457]	765	thread_release( thread );
	766	return EINVAL;
	767	}
[581]	768
[457]	769	hal_cpu_context_init( thread );
[14]	770
[583]	771	// set THREAD_BLOCKED_IDLE for DEV threads
	772	if( type == THREAD_DEV ) thread->blocked \|= THREAD_BLOCKED_IDLE;
[457]	773
[438]	774	#if DEBUG_THREAD_KERNEL_CREATE
[433]	775	cycle = (uint32_t)hal_get_cycles();
[438]	776	if( DEBUG_THREAD_KERNEL_CREATE < cycle )
[593]	777	printk("\n[%s] thread[%x,%x] exit / new_thread %x / type %s / cycle %d\n",
	778	__FUNCTION__, this->process->pid, this->trdid, thread, thread_type_str(type), cycle );
[433]	779	#endif
[1]	780
[171]	781	*new_thread = thread;
[1]	782	return 0;
[5]	783
[296]	784	} // end thread_kernel_create()
	785
[457]	786	//////////////////////////////////////////////
	787	void thread_idle_init( thread_t * thread,
	788	thread_type_t type,
	789	void * func,
	790	void * args,
	791	lid_t core_lid )
[14]	792	{
	793
[564]	794	// check arguments
	795	assert( (type == THREAD_IDLE) , "illegal thread type" );
	796	assert( (core_lid < LOCAL_CLUSTER->cores_nr) , "illegal core index" );
	797
[457]	798	// initialize thread descriptor
[14]	799	error_t error = thread_init( thread,
	800	&process_zero,
	801	type,
	802	func,
	803	args,
	804	core_lid,
	805	0 , 0 ); // no user stack for a kernel thread
	806
[492]	807	assert( (error == 0), "cannot create thread idle" );
[457]	808
[14]	809	// allocate & initialize CPU context if success
[457]	810	error = hal_cpu_context_alloc( thread );
[171]	811
[492]	812	assert( (error == 0), "cannot allocate CPU context" );
[14]	813
[457]	814	hal_cpu_context_init( thread );
	815
[438]	816	} // end thread_idle_init()
[407]	817
[1]	818	///////////////////////////////////////////////////////////////////////////////////////
	819	// TODO: check that all memory dynamically allocated during thread execution
[583]	820	// has been released => check vmm destroy for MMAP vsegs [AG]
[1]	821	///////////////////////////////////////////////////////////////////////////////////////
[583]	822	void thread_destroy( thread_t * thread )
[1]	823	{
[409]	824	reg_t save_sr;
[1]	825
	826	process_t * process = thread->process;
	827	core_t * core = thread->core;
	828
[438]	829	#if DEBUG_THREAD_DESTROY
[583]	830	uint32_t cycle = (uint32_t)hal_get_cycles();
	831	thread_t * this = CURRENT_THREAD;
[438]	832	if( DEBUG_THREAD_DESTROY < cycle )
[593]	833	printk("\n[%s] thread[%x,%x] enter to destroy thread[%x,%x] / cycle %d\n",
[583]	834	__FUNCTION__, this->process->pid, this->trdid, process->pid, thread->trdid, cycle );
[433]	835	#endif
[1]	836
[583]	837	// check busylocks counter
	838	thread_assert_can_yield( thread , __FUNCTION__ );
[171]	839
[1]	840	// update intrumentation values
[408]	841	process->vmm.pgfault_nr += thread->info.pgfault_nr;
[1]	842
	843	// release memory allocated for CPU context and FPU context
	844	hal_cpu_context_destroy( thread );
[409]	845	if ( thread->type == THREAD_USER ) hal_fpu_context_destroy( thread );
[1]	846
[428]	847	// release FPU ownership if required
[409]	848	hal_disable_irq( &save_sr );
[1]	849	if( core->fpu_owner == thread )
	850	{
	851	core->fpu_owner = NULL;
	852	hal_fpu_disable();
	853	}
[409]	854	hal_restore_irq( save_sr );
[1]	855
	856	// invalidate thread descriptor
	857	thread->signature = 0;
	858
	859	// release memory for thread descriptor
[23]	860	thread_release( thread );
[1]	861
[438]	862	#if DEBUG_THREAD_DESTROY
[433]	863	cycle = (uint32_t)hal_get_cycles();
[438]	864	if( DEBUG_THREAD_DESTROY < cycle )
[593]	865	printk("\n[%s] thread[%x,%x] exit / destroyed thread[%x,%x] / cycle %d\n",
[583]	866	__FUNCTION__, this->process->pid, this->trdid, process->pid, thread->trdid, cycle );
[433]	867	#endif
[1]	868
[407]	869	} // end thread_destroy()
	870
[416]	871	//////////////////////////////////////////////////
	872	inline void thread_set_req_ack( thread_t * target,
	873	uint32_t * rsp_count )
[1]	874	{
[409]	875	reg_t save_sr; // for critical section
	876
[416]	877	// get pointer on target thread scheduler
	878	scheduler_t * sched = &target->core->scheduler;
[409]	879
[416]	880	// wait scheduler ready to handle a new request
	881	while( sched->req_ack_pending ) asm volatile( "nop" );
[409]	882
	883	// enter critical section
	884	hal_disable_irq( &save_sr );
	885
[416]	886	// set request in target thread scheduler
	887	sched->req_ack_pending = true;
[409]	888
[416]	889	// set ack request in target thread "flags"
	890	hal_atomic_or( &target->flags , THREAD_FLAG_REQ_ACK );
[409]	891
[416]	892	// set pointer on responses counter in target thread
	893	target->ack_rsp_count = rsp_count;
[409]	894
	895	// exit critical section
	896	hal_restore_irq( save_sr );
	897
[407]	898	hal_fence();
[171]	899
[416]	900	} // thread_set_req_ack()
[409]	901
[416]	902	/////////////////////////////////////////////////////
	903	inline void thread_reset_req_ack( thread_t * target )
[1]	904	{
[409]	905	reg_t save_sr; // for critical section
	906
	907	// get pointer on target thread scheduler
[416]	908	scheduler_t * sched = &target->core->scheduler;
[409]	909
	910	// check signal pending in scheduler
[492]	911	assert( sched->req_ack_pending , "no pending signal" );
[409]	912
	913	// enter critical section
	914	hal_disable_irq( &save_sr );
	915
	916	// reset signal in scheduler
[416]	917	sched->req_ack_pending = false;
[409]	918
	919	// reset signal in thread "flags"
[416]	920	hal_atomic_and( &target->flags , ~THREAD_FLAG_REQ_ACK );
[409]	921
	922	// reset pointer on responses counter
[416]	923	target->ack_rsp_count = NULL;
[409]	924
	925	// exit critical section
	926	hal_restore_irq( save_sr );
	927
[407]	928	hal_fence();
[171]	929
[416]	930	} // thread_reset_req_ack()
[409]	931
[436]	932	//////////////////////////////////////
	933	void thread_block( xptr_t thread_xp,
	934	uint32_t cause )
[407]	935	{
[436]	936	// get thread cluster and local pointer
	937	cxy_t cxy = GET_CXY( thread_xp );
	938	thread_t * ptr = GET_PTR( thread_xp );
	939
[407]	940	// set blocking cause
[436]	941	hal_remote_atomic_or( XPTR( cxy , &ptr->blocked ) , cause );
[407]	942	hal_fence();
	943
[438]	944	#if DEBUG_THREAD_BLOCK
[457]	945	uint32_t cycle = (uint32_t)hal_get_cycles();
	946	process_t * process = hal_remote_lpt( XPTR( cxy , &ptr->process ) );
[593]	947	thread_t * this = CURRENT_THREAD;
[438]	948	if( DEBUG_THREAD_BLOCK < cycle )
[593]	949	printk("\n[%s] thread[%x,%x] blocked thread %x in process %x / cause %x\n",
	950	__FUNCTION__, this->process->pid, this->trdid,
[564]	951	ptr->trdid, hal_remote_l32(XPTR( cxy , &process->pid )), cause );
[433]	952	#endif
	953
[407]	954	} // end thread_block()
	955
[433]	956	////////////////////////////////////////////
	957	uint32_t thread_unblock( xptr_t thread_xp,
[407]	958	uint32_t cause )
	959	{
	960	// get thread cluster and local pointer
[433]	961	cxy_t cxy = GET_CXY( thread_xp );
	962	thread_t * ptr = GET_PTR( thread_xp );
[407]	963
	964	// reset blocking cause
	965	uint32_t previous = hal_remote_atomic_and( XPTR( cxy , &ptr->blocked ) , ~cause );
	966	hal_fence();
	967
[438]	968	#if DEBUG_THREAD_BLOCK
[457]	969	uint32_t cycle = (uint32_t)hal_get_cycles();
	970	process_t * process = hal_remote_lpt( XPTR( cxy , &ptr->process ) );
[593]	971	thread_t * this = CURRENT_THREAD;
[438]	972	if( DEBUG_THREAD_BLOCK < cycle )
[593]	973	printk("\n[%s] thread[%x,%x] unblocked thread %x in process %x / cause %x\n",
	974	__FUNCTION__, this->process->pid, this->trdid,
[564]	975	ptr->trdid, hal_remote_l32(XPTR( cxy , &process->pid )), cause );
[433]	976	#endif
	977
[446]	978	// return a non zero value if the cause bit is modified
	979	return( previous & cause );
[436]	980
[446]	981	} // end thread_unblock()
[407]	982
[440]	983	//////////////////////////////////////
	984	void thread_delete( xptr_t target_xp,
	985	pid_t pid,
	986	bool_t is_forced )
	987	{
	988	reg_t save_sr; // for critical section
	989	bool_t target_join_done; // joining thread arrived first
	990	bool_t target_attached; // target thread attached
	991	xptr_t killer_xp; // extended pointer on killer thread (this)
	992	thread_t * killer_ptr; // pointer on killer thread (this)
	993	cxy_t target_cxy; // target thread cluster
	994	thread_t * target_ptr; // pointer on target thread
	995	xptr_t target_flags_xp; // extended pointer on target thread <flags>
	996	xptr_t target_join_lock_xp; // extended pointer on target thread <join_lock>
	997	xptr_t target_join_xp_xp; // extended pointer on target thread <join_xp>
	998	trdid_t target_trdid; // target thread identifier
	999	ltid_t target_ltid; // target thread local index
	1000	xptr_t joining_xp; // extended pointer on joining thread
	1001	thread_t * joining_ptr; // pointer on joining thread
	1002	cxy_t joining_cxy; // joining thread cluster
	1003
[564]	1004	// get target thread cluster and local pointer
[440]	1005	target_cxy = GET_CXY( target_xp );
	1006	target_ptr = GET_PTR( target_xp );
[564]	1007
	1008	// get target thread identifiers, and attached flag
	1009	target_trdid = hal_remote_l32( XPTR( target_cxy , &target_ptr->trdid ) );
[440]	1010	target_ltid = LTID_FROM_TRDID( target_trdid );
	1011	target_flags_xp = XPTR( target_cxy , &target_ptr->flags );
[564]	1012	target_attached = ( (hal_remote_l32( target_flags_xp ) & THREAD_FLAG_DETACHED) == 0 );
[440]	1013
	1014	// get killer thread pointers
	1015	killer_ptr = CURRENT_THREAD;
	1016	killer_xp = XPTR( local_cxy , killer_ptr );
	1017
	1018	#if DEBUG_THREAD_DELETE
[564]	1019	uint32_t cycle = (uint32_t)hal_get_cycles();
[440]	1020	if( DEBUG_THREAD_DELETE < cycle )
[593]	1021	printk("\n[%s] killer[%x,%x] enters / target[%x,%x] / cycle %d\n",
[583]	1022	__FUNCTION__, killer_ptr->process->pid, killer_ptr->trdid,
	1023	target_ptr->process->pid, target_ptr->trdid, cycle );
[440]	1024	#endif
	1025
[564]	1026	// check target thread is not the main thread, because the main thread
	1027	// must be deleted by the parent process sys_wait() function
	1028	assert( ((CXY_FROM_PID( pid ) != target_cxy) \|\| (target_ltid != 0)),
	1029	"tharget thread cannot be the main thread\n" );
	1030
[583]	1031	// check killer thread can yield
	1032	thread_assert_can_yield( killer_ptr , __FUNCTION__ );
[440]	1033
[583]	1034	// if the target thread is attached, we must synchonize with the joining thread
	1035	// before blocking and marking the target thead for delete.
	1036
	1037	if( target_attached && (is_forced == false) ) // synchronize with joining thread
[564]	1038	{
[440]	1039	// build extended pointers on target thread join fields
	1040	target_join_lock_xp = XPTR( target_cxy , &target_ptr->join_lock );
	1041	target_join_xp_xp = XPTR( target_cxy , &target_ptr->join_xp );
	1042
	1043	// enter critical section
	1044	hal_disable_irq( &save_sr );
	1045
	1046	// take the join_lock in target thread descriptor
[564]	1047	remote_busylock_acquire( target_join_lock_xp );
[440]	1048
	1049	// get join_done from target thread descriptor
[564]	1050	target_join_done = ((hal_remote_l32( target_flags_xp ) & THREAD_FLAG_JOIN_DONE) != 0);
[440]	1051
[583]	1052	if( target_join_done ) // joining thread arrived first
[440]	1053	{
	1054	// get extended pointer on joining thread
[564]	1055	joining_xp = (xptr_t)hal_remote_l64( target_join_xp_xp );
[440]	1056	joining_ptr = GET_PTR( joining_xp );
	1057	joining_cxy = GET_CXY( joining_xp );
	1058
	1059	// reset the join_done flag in target thread
	1060	hal_remote_atomic_and( target_flags_xp , ~THREAD_FLAG_JOIN_DONE );
	1061
	1062	// unblock the joining thread
	1063	thread_unblock( joining_xp , THREAD_BLOCKED_JOIN );
	1064
	1065	// release the join_lock in target thread descriptor
[564]	1066	remote_busylock_release( target_join_lock_xp );
[440]	1067
[583]	1068	// block the target thread
	1069	thread_block( target_xp , THREAD_BLOCKED_GLOBAL );
	1070
[564]	1071	// set the REQ_DELETE flag in target thread descriptor
	1072	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_REQ_DELETE );
	1073
[583]	1074	// exit critical section
[440]	1075	hal_restore_irq( save_sr );
[564]	1076
[583]	1077	#if DEBUG_THREAD_DELETE
	1078	cycle = (uint32_t)hal_get_cycles;
[564]	1079	if( DEBUG_THREAD_DELETE < cycle )
[593]	1080	printk("\n[%s] killer[%x,%x] exit / target[%x,%x] marked after join / cycle %d\n",
[583]	1081	__FUNCTION__, killer_ptr->process->pid, killer_ptr->trdid,
	1082	target_ptr->process->pid, target_ptr->trdid, cycle );
[564]	1083	#endif
[583]	1084
	1085	}
	1086	else // killer thread arrived first
	1087	{
[440]	1088	// set the kill_done flag in target thread
	1089	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_KILL_DONE );
	1090
	1091	// block this thread on BLOCKED_JOIN
	1092	thread_block( killer_xp , THREAD_BLOCKED_JOIN );
	1093
	1094	// set extended pointer on killer thread in target thread
[564]	1095	hal_remote_s64( target_join_xp_xp , killer_xp );
[440]	1096
	1097	// release the join_lock in target thread descriptor
[564]	1098	remote_busylock_release( target_join_lock_xp );
[440]	1099
[583]	1100	#if DEBUG_THREAD_DELETE
	1101	cycle = (uint32_t)hal_get_cycles;
[564]	1102	if( DEBUG_THREAD_DELETE < cycle )
[593]	1103	printk("\n[%s] killer[%x,%x] deschedules / target[%x,%x] not completed / cycle %d\n",
[583]	1104	__FUNCTION__, killer_ptr->process->pid, killer_ptr->trdid,
	1105	target_ptr->process->pid, target_ptr->trdid, cycle );
[564]	1106	#endif
[440]	1107	// deschedule
	1108	sched_yield( "killer thread wait joining thread" );
	1109
[583]	1110	// block the target thread
	1111	thread_block( target_xp , THREAD_BLOCKED_GLOBAL );
	1112
[564]	1113	// set the REQ_DELETE flag in target thread descriptor
	1114	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_REQ_DELETE );
	1115
[583]	1116	// exit critical section
[440]	1117	hal_restore_irq( save_sr );
[583]	1118
	1119	#if DEBUG_THREAD_DELETE
	1120	cycle = (uint32_t)hal_get_cycles;
	1121	if( DEBUG_THREAD_DELETE < cycle )
[593]	1122	printk("\n[%s] killer[%x,%x] exit / target[%x,%x] marked after join / cycle %d\n",
[583]	1123	__FUNCTION__, killer_ptr->process->pid, killer_ptr->trdid,
	1124	target_ptr->process->pid, target_ptr->trdid, cycle );
	1125	#endif
	1126
[440]	1127	}
[564]	1128	}
[583]	1129	else // no synchronization with joining thread required
[564]	1130	{
[583]	1131	// block the target thread
	1132	thread_block( target_xp , THREAD_BLOCKED_GLOBAL );
	1133
[564]	1134	// set the REQ_DELETE flag in target thread descriptor
	1135	hal_remote_atomic_or( target_flags_xp , THREAD_FLAG_REQ_DELETE );
[440]	1136
	1137	#if DEBUG_THREAD_DELETE
	1138	cycle = (uint32_t)hal_get_cycles;
	1139	if( DEBUG_THREAD_DELETE < cycle )
[593]	1140	printk("\n[%s] killer[%x,%x] exit / target [%x,%x] marked / no join / cycle %d\n",
[583]	1141	__FUNCTION__, killer_ptr->process->pid, killer_ptr->trdid,
	1142	target_ptr->process->pid, target_ptr->trdid, cycle );
[440]	1143	#endif
	1144
[583]	1145	}
[440]	1146	} // end thread_delete()
	1147
	1148
	1149
[564]	1150	/////////////////////////////
[485]	1151	void thread_idle_func( void )
[1]	1152	{
	1153	while( 1 )
	1154	{
[408]	1155	// unmask IRQs
	1156	hal_enable_irq( NULL );
	1157
[443]	1158	// force core to low-power mode (optional)
[583]	1159	if( CONFIG_SCHED_IDLE_MODE_SLEEP )
[407]	1160	{
[1]	1161
[564]	1162	#if DEBUG_THREAD_IDLE
	1163	{
	1164	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	1165	if( DEBUG_THREAD_IDLE < cycle )
[593]	1166	printk("\n[%s] idle thread on core[%x,%d] goes to sleep / cycle %d\n",
[446]	1167	__FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, cycle );
[564]	1168	}
[433]	1169	#endif
[1]	1170
[407]	1171	hal_core_sleep();
[1]	1172
[564]	1173	#if DEBUG_THREAD_IDLE
	1174	{
	1175	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	1176	if( DEBUG_THREAD_IDLE < cycle )
[593]	1177	printk("\n[%s] idle thread on core[%x,%d] wake up / cycle %d\n",
[531]	1178	__FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, cycle );
[564]	1179	}
[433]	1180	#endif
[407]	1181
	1182	}
[443]	1183
[446]	1184	#if DEBUG_THREAD_IDLE
[564]	1185	{
	1186	uint32_t cycle = (uint32_t)hal_get_cycles();
	1187	if( DEBUG_THREAD_IDLE < cycle )
[446]	1188	sched_display( CURRENT_THREAD->core->lid );
[564]	1189	}
[446]	1190	#endif
[564]	1191	// search a runable thread
	1192	sched_yield( "running idle thread" );
[446]	1193
[564]	1194	} // end while
	1195
[407]	1196	} // end thread_idle()
[1]	1197
[407]	1198
[473]	1199	///////////////////////////////////////////
	1200	void thread_time_update( thread_t * thread,
[564]	1201	bool_t is_user )
[16]	1202	{
[473]	1203	cycle_t current_cycle; // current cycle counter value
	1204	cycle_t last_cycle; // last cycle counter value
[1]	1205
[473]	1206	// get pointer on thread_info structure
	1207	thread_info_t * info = &thread->info;
	1208
	1209	// get last cycle counter value
	1210	last_cycle = info->last_cycle;
	1211
	1212	// get current cycle counter value
	1213	current_cycle = hal_get_cycles();
	1214
	1215	// update thread_info structure
	1216	info->last_cycle = current_cycle;
	1217
	1218	// update time in thread_info
	1219	if( is_user ) info->usr_cycles += (current_cycle - last_cycle);
	1220	else info->sys_cycles += (current_cycle - last_cycle);
[16]	1221
[564]	1222	} // end thread_time_update()
	1223
[23]	1224	/////////////////////////////////////
	1225	xptr_t thread_get_xptr( pid_t pid,
	1226	trdid_t trdid )
	1227	{
	1228	cxy_t target_cxy; // target thread cluster identifier
	1229	ltid_t target_thread_ltid; // target thread local index
[171]	1230	thread_t * target_thread_ptr; // target thread local pointer
[23]	1231	xptr_t target_process_xp; // extended pointer on target process descriptor
[171]	1232	process_t * target_process_ptr; // local pointer on target process descriptor
[23]	1233	pid_t target_process_pid; // target process identifier
	1234	xlist_entry_t root; // root of list of process in target cluster
	1235	xptr_t lock_xp; // extended pointer on lock protecting this list
[16]	1236
[580]	1237	#if DEBUG_THREAD_GET_XPTR
	1238	uint32_t cycle = (uint32_t)hal_get_cycles();
	1239	thread_t * this = CURRENT_THREAD;
	1240	if( DEBUG_THREAD_GET_XPTR < cycle )
[593]	1241	printk("\n[%s] thread %x in process %x enters / pid %x / trdid %x / cycle %d\n",
[580]	1242	__FUNCTION__, this->trdid, this->process->pid, pid, trdid, cycle );
	1243	#endif
	1244
[23]	1245	// get target cluster identifier and local thread identifier
	1246	target_cxy = CXY_FROM_TRDID( trdid );
	1247	target_thread_ltid = LTID_FROM_TRDID( trdid );
	1248
[436]	1249	// check trdid argument
[564]	1250	if( (target_thread_ltid >= CONFIG_THREADS_MAX_PER_CLUSTER) \|\|
[436]	1251	cluster_is_undefined( target_cxy ) ) return XPTR_NULL;
	1252
[23]	1253	// get root of list of process descriptors in target cluster
	1254	hal_remote_memcpy( XPTR( local_cxy , &root ),
	1255	XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ),
	1256	sizeof(xlist_entry_t) );
	1257
[564]	1258	// get extended pointer on lock protecting the list of local processes
[23]	1259	lock_xp = XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_lock );
	1260
	1261	// take the lock protecting the list of processes in target cluster
[564]	1262	remote_queuelock_acquire( lock_xp );
[23]	1263
[580]	1264	#if( DEBUG_THREAD_GET_XPTR & 1 )
	1265	if( DEBUG_THREAD_GET_XPTR < cycle )
[593]	1266	printk("\n[%s] scan processes in cluster %x :\n", __FUNCTION__, target_cxy );
[580]	1267	#endif
	1268
[564]	1269	// scan the list of local processes in target cluster
[23]	1270	xptr_t iter;
	1271	bool_t found = false;
	1272	XLIST_FOREACH( XPTR( target_cxy , &LOCAL_CLUSTER->pmgr.local_root ) , iter )
	1273	{
	1274	target_process_xp = XLIST_ELEMENT( iter , process_t , local_list );
[469]	1275	target_process_ptr = GET_PTR( target_process_xp );
[564]	1276	target_process_pid = hal_remote_l32( XPTR( target_cxy , &target_process_ptr->pid ) );
[580]	1277
	1278	#if( DEBUG_THREAD_GET_XPTR & 1 )
	1279	if( DEBUG_THREAD_GET_XPTR < cycle )
	1280	printk(" - process %x\n", target_process_pid );
	1281	#endif
	1282
[23]	1283	if( target_process_pid == pid )
	1284	{
	1285	found = true;
	1286	break;
	1287	}
	1288	}
	1289
	1290	// release the lock protecting the list of processes in target cluster
[564]	1291	remote_queuelock_release( lock_xp );
[23]	1292
[436]	1293	// check PID found
[580]	1294	if( found == false )
	1295	{
[23]	1296
[580]	1297	#if( DEBUG_THREAD_GET_XPTR & 1 )
	1298	if( DEBUG_THREAD_GET_XPTR < cycle )
[593]	1299	printk("\n[%s] pid %x not found in cluster %x\n",
[580]	1300	__FUNCTION__, pid, target_cxy );
	1301	#endif
	1302	return XPTR_NULL;
	1303	}
	1304
[23]	1305	// get target thread local pointer
	1306	xptr_t xp = XPTR( target_cxy , &target_process_ptr->th_tbl[target_thread_ltid] );
[171]	1307	target_thread_ptr = (thread_t *)hal_remote_lpt( xp );
[23]	1308
[580]	1309	if( target_thread_ptr == NULL )
	1310	{
[23]	1311
[580]	1312	#if( DEBUG_THREAD_GET_XPTR & 1 )
	1313	if( DEBUG_THREAD_GET_XPTR < cycle )
[593]	1314	printk("\n[%s] thread %x not registered in process %x in cluster %x\n",
[580]	1315	__FUNCTION__, trdid, pid, target_cxy );
	1316	#endif
	1317	return XPTR_NULL;
	1318	}
	1319
	1320	#if DEBUG_THREAD_GET_XPTR
	1321	cycle = (uint32_t)hal_get_cycles();
	1322	if( DEBUG_THREAD_GET_XPTR < cycle )
[593]	1323	printk("\n[%s] thread %x in process %x exit / pid %x / trdid %x / cycle %d\n",
[580]	1324	__FUNCTION__, this->trdid, this->process->pid, pid, trdid, cycle );
	1325	#endif
	1326
[23]	1327	return XPTR( target_cxy , target_thread_ptr );
[564]	1328
	1329	} // end thread_get_xptr()
	1330
	1331	///////////////////////////////////////////////////
	1332	void thread_assert_can_yield( thread_t * thread,
	1333	const char * func_str )
	1334	{
	1335	// does nothing if thread does not hold any busylock
	1336
	1337	if( thread->busylocks )
	1338	{
	1339	// get pointers on TXT0 chdev
	1340	xptr_t txt0_xp = chdev_dir.txt_tx[0];
	1341	cxy_t txt0_cxy = GET_CXY( txt0_xp );
	1342	chdev_t * txt0_ptr = GET_PTR( txt0_xp );
	1343
	1344	// get extended pointer on TXT0 lock
	1345	xptr_t txt0_lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
	1346
	1347	// get TXT0 lock
	1348	remote_busylock_acquire( txt0_lock_xp );
	1349
	1350	// display error message on TXT0
[593]	1351	nolock_printk("\n[PANIC] in %s / thread[%x,%x] cannot yield : "
[580]	1352	"hold %d busylock(s) / cycle %d\n",
[593]	1353	func_str, thread->process->pid, thread->trdid,
[564]	1354	thread->busylocks, (uint32_t)hal_get_cycles() );
	1355
	1356	#if DEBUG_BUSYLOCK
[580]	1357
[583]	1358	// scan list of busylocks
	1359	xptr_t iter_xp;
[580]	1360	xptr_t root_xp = XPTR( local_cxy , &thread->busylocks_root );
	1361	XLIST_FOREACH( root_xp , iter_xp )
[564]	1362	{
[580]	1363	xptr_t lock_xp = XLIST_ELEMENT( iter_xp , busylock_t , xlist );
	1364	cxy_t lock_cxy = GET_CXY( lock_xp );
	1365	busylock_t * lock_ptr = GET_PTR( lock_xp );
	1366	uint32_t lock_type = hal_remote_l32( XPTR( lock_cxy , &lock_ptr->type ) );
	1367	nolock_printk(" - %s in cluster %x\n", lock_type_str[lock_type] , lock_cxy );
	1368	}
[564]	1369
	1370	#endif
[23]	1371
[564]	1372	// release TXT0 lock
	1373	remote_busylock_release( txt0_lock_xp );
	1374
	1375	// suicide
	1376	hal_core_sleep();
	1377	}
	1378	} // end thread_assert_can yield()
	1379
[580]	1380	//////////////////////////////////////////////////
	1381	void thread_display_busylocks( xptr_t thread_xp )
[564]	1382	{
[581]	1383	// get cluster and local pointer of target thread
	1384	cxy_t thread_cxy = GET_CXY( thread_xp );
	1385	thread_t * thread_ptr = GET_PTR( thread_xp );
[564]	1386
[581]	1387	#if( DEBUG_BUSYLOCK )
[564]	1388
[581]	1389	xptr_t iter_xp;
[564]	1390
[581]	1391	// get target thread TRDID and busylocks
	1392	trdid_t trdid = hal_remote_l32(XPTR( thread_cxy , &thread_ptr->trdid ));
	1393	uint32_t locks = hal_remote_l32(XPTR( thread_cxy , &thread_ptr->busylocks ));
[564]	1394
[581]	1395	// get target thread process and PID;
	1396	process_t * process = hal_remote_lpt(XPTR( thread_cxy , &thread_ptr->process ));
	1397	pid_t pid = hal_remote_l32(XPTR( thread_cxy , &process->pid ));
[564]	1398
[581]	1399	// get extended pointer on root of busylocks
	1400	xptr_t root_xp = XPTR( thread_cxy , &thread_ptr->busylocks_root );
[564]	1401
[581]	1402	// get pointers on TXT0 chdev
	1403	xptr_t txt0_xp = chdev_dir.txt_tx[0];
	1404	cxy_t txt0_cxy = GET_CXY( txt0_xp );
	1405	chdev_t * txt0_ptr = GET_PTR( txt0_xp );
[580]	1406
[581]	1407	// get extended pointer on remote TXT0 lock
	1408	xptr_t txt0_lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock );
[580]	1409
[581]	1410	// get TXT0 lock
	1411	remote_busylock_acquire( txt0_lock_xp );
[580]	1412
[581]	1413	// display header
	1414	nolock_printk("\n***** thread %x in process %x : %d busylocks at cycle %d\n",
	1415	trdid, pid, locks, (uint32_t)hal_get_cycles() );
	1416
	1417	// scan the xlist of busylocks when required
	1418	if( locks )
	1419	{
	1420	XLIST_FOREACH( root_xp , iter_xp )
[580]	1421	{
[581]	1422	xptr_t lock_xp = XLIST_ELEMENT( iter_xp , busylock_t , xlist );
	1423	cxy_t lock_cxy = GET_CXY( lock_xp );
	1424	busylock_t * lock_ptr = GET_PTR( lock_xp );
	1425	uint32_t lock_type = hal_remote_l32(XPTR( lock_cxy , &lock_ptr->type ));
	1426	nolock_printk(" - %s in cluster %x\n", lock_type_str[lock_type] , lock_cxy );
[580]	1427	}
[581]	1428	}
[580]	1429
[581]	1430	// release TXT0 lock
	1431	remote_busylock_release( txt0_lock_xp );
	1432
	1433	return;
	1434
	1435	#endif
	1436
	1437	// display a warning
	1438	printk("\n[WARNING] set the DEBUG_BUSYLOCK parmeter in kernel_config.h"
	1439	" to display busylocks for thread %x/%x\n", thread_cxy, thread_ptr );
	1440
[580]	1441	} // end thread_display_busylock()
[581]	1442

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