WebSVN – HelenOS-historic – Diff – /kernel/trunk/generic/src/proc/thread.c


/*
 * Copyright (C) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#include <proc/scheduler.h>
#include <proc/thread.h>
#include <proc/task.h>
#include <mm/heap.h>
#include <mm/frame.h>
#include <mm/page.h>
#include <arch/asm.h>
#include <arch.h>
#include <synch/synch.h>
#include <synch/spinlock.h>
#include <synch/waitq.h>
#include <synch/rwlock.h>
#include <cpu.h>
#include <func.h>
#include <context.h>
#include <list.h>
#include <typedefs.h>
#include <time/clock.h>
#include <list.h>
#include <config.h>
#include <arch/interrupt.h>
#include <smp/ipi.h>
#include <arch/faddr.h>
#include <arch/atomic.h>
#include <memstr.h>
 
char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */
 
spinlock_t threads_lock;
link_t threads_head;
 
static spinlock_t tidlock;
__u32 last_tid = 0;
 
 
/** Thread wrapper
 *
 * This wrapper is provided to ensure that every thread
 * makes a call to thread_exit() when its implementing
 * function returns.
 *
 * interrupts_disable() is assumed.
 *
 */
static void cushion(void)
{
    void (*f)(void *) = THREAD->thread_code;
    void *arg = THREAD->thread_arg;
 
    /* this is where each thread wakes up after its creation */
    before_thread_runs();
 
    spinlock_unlock(&THREAD->lock);
    interrupts_enable();
 
    f(arg);
    thread_exit();
    /* not reached */
}
 
 
/** Initialize threads
 *
 * Initialize kernel threads support.
 *
 */
void thread_init(void)
{
    THREAD = NULL;
    nrdy = 0;
    spinlock_initialize(&threads_lock, "threads_lock");
    list_initialize(&threads_head);
}
 
 
/** Make thread ready
 *
 * Switch thread t to the ready state.
 *
 * @param t Thread to make ready.
 *
 */
void thread_ready(thread_t *t)
{
    cpu_t *cpu;
    runq_t *r;
    ipl_t ipl;
    int i, avg, send_ipi = 0;
 
    ipl = interrupts_disable();
 
    spinlock_lock(&t->lock);
 
    i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
   
    cpu = CPU;
    if (t->flags & X_WIRED) {
        cpu = t->cpu;
    }
    spinlock_unlock(&t->lock);
   
    /*
     * Append t to respective ready queue on respective processor.
     */
    r = &cpu->rq[i];
    spinlock_lock(&r->lock);
    list_append(&t->rq_link, &r->rq_head);
    r->n++;
    spinlock_unlock(&r->lock);
 
    atomic_inc(&nrdy);
    avg = nrdy / config.cpu_active;
 
    spinlock_lock(&cpu->lock);
    if ((++cpu->nrdy) > avg) {
        /*
         * If there are idle halted CPU's, this will wake them up.
         */
        ipi_broadcast(VECTOR_WAKEUP_IPI);
    }  
    spinlock_unlock(&cpu->lock);
 
    interrupts_restore(ipl);
}
 
 
/** Create new thread
 *
 * Create a new thread.
 *
 * @param func  Thread's implementing function.
 * @param arg   Thread's implementing function argument.
 * @param task  Task to which the thread belongs.
 * @param flags Thread flags.
 *
 * @return New thread's structure on success, NULL on failure.
 *
 */
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags)
{
    thread_t *t;
    __address frame_ks, frame_us = NULL;
 
    t = (thread_t *) malloc(sizeof(thread_t));
    if (t) {
        ipl_t ipl;
   
        spinlock_initialize(&t->lock, "thread_t_lock");
   
        frame_ks = frame_alloc(FRAME_KA, ONE_FRAME);
        if (THREAD_USER_STACK & flags) {
            frame_us = frame_alloc(FRAME_KA, ONE_FRAME);
        }
 
        ipl = interrupts_disable();
        spinlock_lock(&tidlock);
        t->tid = ++last_tid;
        spinlock_unlock(&tidlock);
        interrupts_restore(ipl);
       
        memsetb(frame_ks, THREAD_STACK_SIZE, 0);
        link_initialize(&t->rq_link);
        link_initialize(&t->wq_link);
        link_initialize(&t->th_link);
        link_initialize(&t->threads_link);
        t->kstack = (__u8 *) frame_ks;
        t->ustack = (__u8 *) frame_us;
       
        context_save(&t->saved_context);
        context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
       
        the_initialize((the_t *) t->kstack);
 
        ipl = interrupts_disable();
        t->saved_context.ipl = interrupts_read();
        interrupts_restore(ipl);
       
        t->thread_code = func;
        t->thread_arg = arg;
        t->ticks = -1;
        t->priority = -1;       /* start in rq[0] */
        t->cpu = NULL;
        t->flags = 0;
        t->state = Entering;
        t->call_me = NULL;
        t->call_me_with = NULL;
       
        timeout_initialize(&t->sleep_timeout);
        t->sleep_queue = NULL;
        t->timeout_pending = 0;
       
        t->rwlock_holder_type = RWLOCK_NONE;
       
        t->task = task;
       
        t->fpu_context_exists=0;
        t->fpu_context_engaged=0;
       
        /*
         * Register this thread in the system-wide list.
         */
        ipl = interrupts_disable();    
        spinlock_lock(&threads_lock);
        list_append(&t->threads_link, &threads_head);
        spinlock_unlock(&threads_lock);
 
        /*
         * Attach to the containing task.
         */
        spinlock_lock(&task->lock);
        list_append(&t->th_link, &task->th_head);
        spinlock_unlock(&task->lock);
 
        interrupts_restore(ipl);
    }
 
    return t;
}
 
 
/** Make thread exiting
 *
 * End current thread execution and switch it to the exiting
 * state. All pending timeouts are executed.
 *
 */
void thread_exit(void)
{
    ipl_t ipl;
 
restart:
    ipl = interrupts_disable();
    spinlock_lock(&THREAD->lock);
    if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
        spinlock_unlock(&THREAD->lock);
        interrupts_restore(ipl);
        goto restart;
    }
    THREAD->state = Exiting;
    spinlock_unlock(&THREAD->lock);
    scheduler();
}
 
 
/** Thread sleep
 *
 * Suspend execution of the current thread.
 *
 * @param sec Number of seconds to sleep.
 *
 */
void thread_sleep(__u32 sec)
{
    thread_usleep(sec*1000000);
}
 
 
/** Thread usleep
 *
 * Suspend execution of the current thread.
 *
 * @param usec Number of microseconds to sleep.
 *
 */
void thread_usleep(__u32 usec)
{
    waitq_t wq;
                 
    waitq_initialize(&wq);
 
    (void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
}
 
 
/** Register thread out-of-context invocation
 *
 * Register a function and its argument to be executed
 * on next context switch to the current thread.
 *
 * @param call_me      Out-of-context function.
 * @param call_me_with Out-of-context function argument.
 *
 */
void thread_register_call_me(void (* call_me)(void *), void *call_me_with)
{
    ipl_t ipl;
   
    ipl = interrupts_disable();
    spinlock_lock(&THREAD->lock);
    THREAD->call_me = call_me;
    THREAD->call_me_with = call_me_with;
    spinlock_unlock(&THREAD->lock);
    interrupts_restore(ipl);
}
 

Rev 548	Rev 552
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	#include <proc/scheduler.h>	29	#include <proc/scheduler.h>
30	#include <proc/thread.h>	30	#include <proc/thread.h>
31	#include <proc/task.h>	31	#include <proc/task.h>
32	#include <mm/heap.h>	32	#include <mm/heap.h>
33	#include <mm/frame.h>	33	#include <mm/frame.h>
34	#include <mm/page.h>	34	#include <mm/page.h>
35	#include <arch/asm.h>	35	#include <arch/asm.h>
36	#include <arch.h>	36	#include <arch.h>
37	#include <synch/synch.h>	37	#include <synch/synch.h>
38	#include <synch/spinlock.h>	38	#include <synch/spinlock.h>
39	#include <synch/waitq.h>	39	#include <synch/waitq.h>
40	#include <synch/rwlock.h>	40	#include <synch/rwlock.h>
41	#include <cpu.h>	41	#include <cpu.h>
42	#include <func.h>	42	#include <func.h>
43	#include <context.h>	43	#include <context.h>
44	#include <list.h>	44	#include <list.h>
45	#include <typedefs.h>	45	#include <typedefs.h>
46	#include <time/clock.h>	46	#include <time/clock.h>
47	#include <list.h>	47	#include <list.h>
48	#include <config.h>	48	#include <config.h>
49	#include <arch/interrupt.h>	49	#include <arch/interrupt.h>
50	#include <smp/ipi.h>	50	#include <smp/ipi.h>
51	#include <arch/faddr.h>	51	#include <arch/faddr.h>
52	#include <arch/atomic.h>	52	#include <arch/atomic.h>
53	#include <memstr.h>	53	#include <memstr.h>
54		54
55	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /	55	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /
56		56
57	spinlock_t threads_lock;	57	spinlock_t threads_lock;
58	link_t threads_head;	58	link_t threads_head;
59		59
60	static spinlock_t tidlock;	60	static spinlock_t tidlock;
61	__u32 last_tid = 0;	61	__u32 last_tid = 0;
62		62
63		63
64	/** Thread wrapper	64	/** Thread wrapper
65	*	65	*
66	* This wrapper is provided to ensure that every thread	66	* This wrapper is provided to ensure that every thread
67	* makes a call to thread_exit() when its implementing	67	* makes a call to thread_exit() when its implementing
68	* function returns.	68	* function returns.
69	*	69	*
70	* interrupts_disable() is assumed.	70	* interrupts_disable() is assumed.
71	*	71	*
72	*/	72	*/
73	static void cushion(void)	73	static void cushion(void)
74	{	74	{
75	void (f)(void ) = THREAD->thread_code;	75	void (f)(void ) = THREAD->thread_code;
76	void *arg = THREAD->thread_arg;	76	void *arg = THREAD->thread_arg;
77		77
78	/* this is where each thread wakes up after its creation */	78	/* this is where each thread wakes up after its creation */
79	before_thread_runs();	79	before_thread_runs();
80		80
81	spinlock_unlock(&THREAD->lock);	81	spinlock_unlock(&THREAD->lock);
82	interrupts_enable();	82	interrupts_enable();
83		83
84	f(arg);	84	f(arg);
85	thread_exit();	85	thread_exit();
86	/* not reached */	86	/* not reached */
87	}	87	}
88		88
89		89
90	/** Initialize threads	90	/** Initialize threads
91	*	91	*
92	* Initialize kernel threads support.	92	* Initialize kernel threads support.
93	*	93	*
94	*/	94	*/
95	void thread_init(void)	95	void thread_init(void)
96	{	96	{
97	THREAD = NULL;	97	THREAD = NULL;
98	nrdy = 0;	98	nrdy = 0;
99	spinlock_initialize(&threads_lock);	99	spinlock_initialize(&threads_lock, "threads_lock");
100	list_initialize(&threads_head);	100	list_initialize(&threads_head);
101	}	101	}
102		102
103		103
104	/** Make thread ready	104	/** Make thread ready
105	*	105	*
106	* Switch thread t to the ready state.	106	* Switch thread t to the ready state.
107	*	107	*
108	* @param t Thread to make ready.	108	* @param t Thread to make ready.
109	*	109	*
110	*/	110	*/
111	void thread_ready(thread_t *t)	111	void thread_ready(thread_t *t)
112	{	112	{
113	cpu_t *cpu;	113	cpu_t *cpu;
114	runq_t *r;	114	runq_t *r;
115	ipl_t ipl;	115	ipl_t ipl;
116	int i, avg, send_ipi = 0;	116	int i, avg, send_ipi = 0;
117		117
118	ipl = interrupts_disable();	118	ipl = interrupts_disable();
119		119
120	spinlock_lock(&t->lock);	120	spinlock_lock(&t->lock);
121		121
122	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	122	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
123		123
124	cpu = CPU;	124	cpu = CPU;
125	if (t->flags & X_WIRED) {	125	if (t->flags & X_WIRED) {
126	cpu = t->cpu;	126	cpu = t->cpu;
127	}	127	}
128	spinlock_unlock(&t->lock);	128	spinlock_unlock(&t->lock);
129		129
130	/*	130	/*
131	* Append t to respective ready queue on respective processor.	131	* Append t to respective ready queue on respective processor.
132	*/	132	*/
133	r = &cpu->rq[i];	133	r = &cpu->rq[i];
134	spinlock_lock(&r->lock);	134	spinlock_lock(&r->lock);
135	list_append(&t->rq_link, &r->rq_head);	135	list_append(&t->rq_link, &r->rq_head);
136	r->n++;	136	r->n++;
137	spinlock_unlock(&r->lock);	137	spinlock_unlock(&r->lock);
138		138
139	atomic_inc(&nrdy);	139	atomic_inc(&nrdy);
140	avg = nrdy / config.cpu_active;	140	avg = nrdy / config.cpu_active;
141		141
142	spinlock_lock(&cpu->lock);	142	spinlock_lock(&cpu->lock);
143	if ((++cpu->nrdy) > avg) {	143	if ((++cpu->nrdy) > avg) {
144	/*	144	/*
145	* If there are idle halted CPU's, this will wake them up.	145	* If there are idle halted CPU's, this will wake them up.
146	*/	146	*/
147	ipi_broadcast(VECTOR_WAKEUP_IPI);	147	ipi_broadcast(VECTOR_WAKEUP_IPI);
148	}	148	}
149	spinlock_unlock(&cpu->lock);	149	spinlock_unlock(&cpu->lock);
150		150
151	interrupts_restore(ipl);	151	interrupts_restore(ipl);
152	}	152	}
153		153
154		154
155	/** Create new thread	155	/** Create new thread
156	*	156	*
157	* Create a new thread.	157	* Create a new thread.
158	*	158	*
159	* @param func Thread's implementing function.	159	* @param func Thread's implementing function.
160	* @param arg Thread's implementing function argument.	160	* @param arg Thread's implementing function argument.
161	* @param task Task to which the thread belongs.	161	* @param task Task to which the thread belongs.
162	* @param flags Thread flags.	162	* @param flags Thread flags.
163	*	163	*
164	* @return New thread's structure on success, NULL on failure.	164	* @return New thread's structure on success, NULL on failure.
165	*	165	*
166	*/	166	*/
167	thread_t thread_create(void ( func)(void ), void arg, task_t *task, int flags)	167	thread_t thread_create(void ( func)(void ), void arg, task_t *task, int flags)
168	{	168	{
169	thread_t *t;	169	thread_t *t;
170	__address frame_ks, frame_us = NULL;	170	__address frame_ks, frame_us = NULL;
171		171
172	t = (thread_t *) malloc(sizeof(thread_t));	172	t = (thread_t *) malloc(sizeof(thread_t));
173	if (t) {	173	if (t) {
174	ipl_t ipl;	174	ipl_t ipl;
175		175
176	spinlock_initialize(&t->lock);	176	spinlock_initialize(&t->lock, "thread_t_lock");
177		177
178	frame_ks = frame_alloc(FRAME_KA, ONE_FRAME);	178	frame_ks = frame_alloc(FRAME_KA, ONE_FRAME);
179	if (THREAD_USER_STACK & flags) {	179	if (THREAD_USER_STACK & flags) {
180	frame_us = frame_alloc(FRAME_KA, ONE_FRAME);	180	frame_us = frame_alloc(FRAME_KA, ONE_FRAME);
181	}	181	}
182		182
183	ipl = interrupts_disable();	183	ipl = interrupts_disable();
184	spinlock_lock(&tidlock);	184	spinlock_lock(&tidlock);
185	t->tid = ++last_tid;	185	t->tid = ++last_tid;
186	spinlock_unlock(&tidlock);	186	spinlock_unlock(&tidlock);
187	interrupts_restore(ipl);	187	interrupts_restore(ipl);
188		188
189	memsetb(frame_ks, THREAD_STACK_SIZE, 0);	189	memsetb(frame_ks, THREAD_STACK_SIZE, 0);
190	link_initialize(&t->rq_link);	190	link_initialize(&t->rq_link);
191	link_initialize(&t->wq_link);	191	link_initialize(&t->wq_link);
192	link_initialize(&t->th_link);	192	link_initialize(&t->th_link);
193	link_initialize(&t->threads_link);	193	link_initialize(&t->threads_link);
194	t->kstack = (__u8 *) frame_ks;	194	t->kstack = (__u8 *) frame_ks;
195	t->ustack = (__u8 *) frame_us;	195	t->ustack = (__u8 *) frame_us;
196		196
197	context_save(&t->saved_context);	197	context_save(&t->saved_context);
198	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	198	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
199		199
200	the_initialize((the_t *) t->kstack);	200	the_initialize((the_t *) t->kstack);
201		201
202	ipl = interrupts_disable();	202	ipl = interrupts_disable();
203	t->saved_context.ipl = interrupts_read();	203	t->saved_context.ipl = interrupts_read();
204	interrupts_restore(ipl);	204	interrupts_restore(ipl);
205		205
206	t->thread_code = func;	206	t->thread_code = func;
207	t->thread_arg = arg;	207	t->thread_arg = arg;
208	t->ticks = -1;	208	t->ticks = -1;
209	t->priority = -1; /* start in rq[0] */	209	t->priority = -1; /* start in rq[0] */
210	t->cpu = NULL;	210	t->cpu = NULL;
211	t->flags = 0;	211	t->flags = 0;
212	t->state = Entering;	212	t->state = Entering;
213	t->call_me = NULL;	213	t->call_me = NULL;
214	t->call_me_with = NULL;	214	t->call_me_with = NULL;
215		215
216	timeout_initialize(&t->sleep_timeout);	216	timeout_initialize(&t->sleep_timeout);
217	t->sleep_queue = NULL;	217	t->sleep_queue = NULL;
218	t->timeout_pending = 0;	218	t->timeout_pending = 0;
219		219
220	t->rwlock_holder_type = RWLOCK_NONE;	220	t->rwlock_holder_type = RWLOCK_NONE;
221		221
222	t->task = task;	222	t->task = task;
223		223
224	t->fpu_context_exists=0;	224	t->fpu_context_exists=0;
225	t->fpu_context_engaged=0;	225	t->fpu_context_engaged=0;
226		226
227	/*	227	/*
228	* Register this thread in the system-wide list.	228	* Register this thread in the system-wide list.
229	*/	229	*/
230	ipl = interrupts_disable();	230	ipl = interrupts_disable();
231	spinlock_lock(&threads_lock);	231	spinlock_lock(&threads_lock);
232	list_append(&t->threads_link, &threads_head);	232	list_append(&t->threads_link, &threads_head);
233	spinlock_unlock(&threads_lock);	233	spinlock_unlock(&threads_lock);
234		234
235	/*	235	/*
236	* Attach to the containing task.	236	* Attach to the containing task.
237	*/	237	*/
238	spinlock_lock(&task->lock);	238	spinlock_lock(&task->lock);
239	list_append(&t->th_link, &task->th_head);	239	list_append(&t->th_link, &task->th_head);
240	spinlock_unlock(&task->lock);	240	spinlock_unlock(&task->lock);
241		241
242	interrupts_restore(ipl);	242	interrupts_restore(ipl);
243	}	243	}
244		244
245	return t;	245	return t;
246	}	246	}
247		247
248		248
249	/** Make thread exiting	249	/** Make thread exiting
250	*	250	*
251	* End current thread execution and switch it to the exiting	251	* End current thread execution and switch it to the exiting
252	* state. All pending timeouts are executed.	252	* state. All pending timeouts are executed.
253	*	253	*
254	*/	254	*/
255	void thread_exit(void)	255	void thread_exit(void)
256	{	256	{
257	ipl_t ipl;	257	ipl_t ipl;
258		258
259	restart:	259	restart:
260	ipl = interrupts_disable();	260	ipl = interrupts_disable();
261	spinlock_lock(&THREAD->lock);	261	spinlock_lock(&THREAD->lock);
262	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	262	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
263	spinlock_unlock(&THREAD->lock);	263	spinlock_unlock(&THREAD->lock);
264	interrupts_restore(ipl);	264	interrupts_restore(ipl);
265	goto restart;	265	goto restart;
266	}	266	}
267	THREAD->state = Exiting;	267	THREAD->state = Exiting;
268	spinlock_unlock(&THREAD->lock);	268	spinlock_unlock(&THREAD->lock);
269	scheduler();	269	scheduler();
270	}	270	}
271		271
272		272
273	/** Thread sleep	273	/** Thread sleep
274	*	274	*
275	* Suspend execution of the current thread.	275	* Suspend execution of the current thread.
276	*	276	*
277	* @param sec Number of seconds to sleep.	277	* @param sec Number of seconds to sleep.
278	*	278	*
279	*/	279	*/
280	void thread_sleep(__u32 sec)	280	void thread_sleep(__u32 sec)
281	{	281	{
282	thread_usleep(sec*1000000);	282	thread_usleep(sec*1000000);
283	}	283	}
284		284
285		285
286	/** Thread usleep	286	/** Thread usleep
287	*	287	*
288	* Suspend execution of the current thread.	288	* Suspend execution of the current thread.
289	*	289	*
290	* @param usec Number of microseconds to sleep.	290	* @param usec Number of microseconds to sleep.
291	*	291	*
292	*/	292	*/
293	void thread_usleep(__u32 usec)	293	void thread_usleep(__u32 usec)
294	{	294	{
295	waitq_t wq;	295	waitq_t wq;
296		296
297	waitq_initialize(&wq);	297	waitq_initialize(&wq);
298		298
299	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	299	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
300	}	300	}
301		301
302		302
303	/** Register thread out-of-context invocation	303	/** Register thread out-of-context invocation
304	*	304	*
305	* Register a function and its argument to be executed	305	* Register a function and its argument to be executed
306	* on next context switch to the current thread.	306	* on next context switch to the current thread.
307	*	307	*
308	* @param call_me Out-of-context function.	308	* @param call_me Out-of-context function.
309	* @param call_me_with Out-of-context function argument.	309	* @param call_me_with Out-of-context function argument.
310	*	310	*
311	*/	311	*/
312	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	312	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
313	{	313	{
314	ipl_t ipl;	314	ipl_t ipl;
315		315
316	ipl = interrupts_disable();	316	ipl = interrupts_disable();
317	spinlock_lock(&THREAD->lock);	317	spinlock_lock(&THREAD->lock);
318	THREAD->call_me = call_me;	318	THREAD->call_me = call_me;
319	THREAD->call_me_with = call_me_with;	319	THREAD->call_me_with = call_me_with;
320	spinlock_unlock(&THREAD->lock);	320	spinlock_unlock(&THREAD->lock);
321	interrupts_restore(ipl);	321	interrupts_restore(ipl);
322	}	322	}
323		323

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/proc/thread.c – Rev 548 → 552