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>
#include <print.h>
 
char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */
 
SPINLOCK_INITIALIZE(threads_lock);  /**< Lock protecting threads_head list. For locking rules, see declaration thereof. */
LIST_INITIALIZE(threads_head);      /**< List of all threads. */
 
SPINLOCK_INITIALIZE(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;
    atomic_set(&nrdy,0);
}
 
 
/** 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;
 
    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 = atomic_get(&nrdy) / config.cpu_active;
 
    atomic_inc(&cpu->nrdy);
 
 
 
 
 
 
 
 
    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, NULL, NULL);
        if (THREAD_USER_STACK & flags) {
            frame_us = frame_alloc(FRAME_KA, ONE_FRAME, NULL,NULL);
        }
 
        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);
}
 
/** Print list of threads debug info */
void thread_print_list(void)
{
    link_t *cur;
    thread_t *t;
    ipl_t ipl;
   
    /* Messing with thread structures, avoid deadlock */
    ipl = interrupts_disable();
    spinlock_lock(&threads_lock);
 
    for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
        t = list_get_instance(cur, thread_t, threads_link);
        printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
        if (t->cpu)
            printf("cpu%d ", t->cpu->id);
       
        printf("\n");
    }
 
    spinlock_unlock(&threads_lock);
    interrupts_enable();
}
 

Rev 777	Rev 783
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	#include <print.h>	54	#include <print.h>
55		55
56	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /	56	char thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /< Thread states /
57		57
58	SPINLOCK_INITIALIZE(threads_lock); /*< Lock protecting threads_head list. For locking rules, see declaration thereof. /	58	SPINLOCK_INITIALIZE(threads_lock); /*< Lock protecting threads_head list. For locking rules, see declaration thereof. /
59	LIST_INITIALIZE(threads_head); /*< List of all threads. /	59	LIST_INITIALIZE(threads_head); /*< List of all threads. /
60		60
61	SPINLOCK_INITIALIZE(tidlock);	61	SPINLOCK_INITIALIZE(tidlock);
62	__u32 last_tid = 0;	62	__u32 last_tid = 0;
63		63
64		64
65	/** Thread wrapper	65	/** Thread wrapper
66	*	66	*
67	* This wrapper is provided to ensure that every thread	67	* This wrapper is provided to ensure that every thread
68	* makes a call to thread_exit() when its implementing	68	* makes a call to thread_exit() when its implementing
69	* function returns.	69	* function returns.
70	*	70	*
71	* interrupts_disable() is assumed.	71	* interrupts_disable() is assumed.
72	*	72	*
73	*/	73	*/
74	static void cushion(void)	74	static void cushion(void)
75	{	75	{
76	void (f)(void ) = THREAD->thread_code;	76	void (f)(void ) = THREAD->thread_code;
77	void *arg = THREAD->thread_arg;	77	void *arg = THREAD->thread_arg;
78		78
79	/* this is where each thread wakes up after its creation */	79	/* this is where each thread wakes up after its creation */
80	before_thread_runs();	80	before_thread_runs();
81		81
82	spinlock_unlock(&THREAD->lock);	82	spinlock_unlock(&THREAD->lock);
83	interrupts_enable();	83	interrupts_enable();
84		84
85	f(arg);	85	f(arg);
86	thread_exit();	86	thread_exit();
87	/* not reached */	87	/* not reached */
88	}	88	}
89		89
90		90
91	/** Initialize threads	91	/** Initialize threads
92	*	92	*
93	* Initialize kernel threads support.	93	* Initialize kernel threads support.
94	*	94	*
95	*/	95	*/
96	void thread_init(void)	96	void thread_init(void)
97	{	97	{
98	THREAD = NULL;	98	THREAD = NULL;
99	atomic_set(&nrdy,0);	99	atomic_set(&nrdy,0);
100	}	100	}
101		101
102		102
103	/** Make thread ready	103	/** Make thread ready
104	*	104	*
105	* Switch thread t to the ready state.	105	* Switch thread t to the ready state.
106	*	106	*
107	* @param t Thread to make ready.	107	* @param t Thread to make ready.
108	*	108	*
109	*/	109	*/
110	void thread_ready(thread_t *t)	110	void thread_ready(thread_t *t)
111	{	111	{
112	cpu_t *cpu;	112	cpu_t *cpu;
113	runq_t *r;	113	runq_t *r;
114	ipl_t ipl;	114	ipl_t ipl;
115	int i, avg;	115	int i, avg;
116		116
117	ipl = interrupts_disable();	117	ipl = interrupts_disable();
118		118
119	spinlock_lock(&t->lock);	119	spinlock_lock(&t->lock);
120		120
121	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;	121	i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority;
122		122
123	cpu = CPU;	123	cpu = CPU;
124	if (t->flags & X_WIRED) {	124	if (t->flags & X_WIRED) {
125	cpu = t->cpu;	125	cpu = t->cpu;
126	}	126	}
127	spinlock_unlock(&t->lock);	127	spinlock_unlock(&t->lock);
128		128
129	/*	129	/*
130	* Append t to respective ready queue on respective processor.	130	* Append t to respective ready queue on respective processor.
131	*/	131	*/
132	r = &cpu->rq[i];	132	r = &cpu->rq[i];
133	spinlock_lock(&r->lock);	133	spinlock_lock(&r->lock);
134	list_append(&t->rq_link, &r->rq_head);	134	list_append(&t->rq_link, &r->rq_head);
135	r->n++;	135	r->n++;
136	spinlock_unlock(&r->lock);	136	spinlock_unlock(&r->lock);
137		137
138	atomic_inc(&nrdy);	138	atomic_inc(&nrdy);
139	avg = atomic_get(&nrdy) / config.cpu_active;	139	avg = atomic_get(&nrdy) / config.cpu_active;
140		-
141	spinlock_lock(&cpu->lock);	140	atomic_inc(&cpu->nrdy);
142	if ((++cpu->nrdy) > avg) {	-
143	/*	-
144	* If there are idle halted CPU's, this will wake them up.	-
145	*/	-
146	ipi_broadcast(VECTOR_WAKEUP_IPI);	-
147	}	-
148	spinlock_unlock(&cpu->lock);	-
149		141
150	interrupts_restore(ipl);	142	interrupts_restore(ipl);
151	}	143	}
152		144
153		145
154	/** Create new thread	146	/** Create new thread
155	*	147	*
156	* Create a new thread.	148	* Create a new thread.
157	*	149	*
158	* @param func Thread's implementing function.	150	* @param func Thread's implementing function.
159	* @param arg Thread's implementing function argument.	151	* @param arg Thread's implementing function argument.
160	* @param task Task to which the thread belongs.	152	* @param task Task to which the thread belongs.
161	* @param flags Thread flags.	153	* @param flags Thread flags.
162	*	154	*
163	* @return New thread's structure on success, NULL on failure.	155	* @return New thread's structure on success, NULL on failure.
164	*	156	*
165	*/	157	*/
166	thread_t thread_create(void ( func)(void ), void arg, task_t *task, int flags)	158	thread_t thread_create(void ( func)(void ), void arg, task_t *task, int flags)
167	{	159	{
168	thread_t *t;	160	thread_t *t;
169	__address frame_ks, frame_us = NULL;	161	__address frame_ks, frame_us = NULL;
170		162
171	t = (thread_t *) malloc(sizeof(thread_t));	163	t = (thread_t *) malloc(sizeof(thread_t));
172	if (t) {	164	if (t) {
173	ipl_t ipl;	165	ipl_t ipl;
174		166
175	spinlock_initialize(&t->lock, "thread_t_lock");	167	spinlock_initialize(&t->lock, "thread_t_lock");
176		168
177	frame_ks = frame_alloc(FRAME_KA, ONE_FRAME, NULL, NULL);	169	frame_ks = frame_alloc(FRAME_KA, ONE_FRAME, NULL, NULL);
178	if (THREAD_USER_STACK & flags) {	170	if (THREAD_USER_STACK & flags) {
179	frame_us = frame_alloc(FRAME_KA, ONE_FRAME, NULL,NULL);	171	frame_us = frame_alloc(FRAME_KA, ONE_FRAME, NULL,NULL);
180	}	172	}
181		173
182	ipl = interrupts_disable();	174	ipl = interrupts_disable();
183	spinlock_lock(&tidlock);	175	spinlock_lock(&tidlock);
184	t->tid = ++last_tid;	176	t->tid = ++last_tid;
185	spinlock_unlock(&tidlock);	177	spinlock_unlock(&tidlock);
186	interrupts_restore(ipl);	178	interrupts_restore(ipl);
187		179
188	memsetb(frame_ks, THREAD_STACK_SIZE, 0);	180	memsetb(frame_ks, THREAD_STACK_SIZE, 0);
189	link_initialize(&t->rq_link);	181	link_initialize(&t->rq_link);
190	link_initialize(&t->wq_link);	182	link_initialize(&t->wq_link);
191	link_initialize(&t->th_link);	183	link_initialize(&t->th_link);
192	link_initialize(&t->threads_link);	184	link_initialize(&t->threads_link);
193	t->kstack = (__u8 *) frame_ks;	185	t->kstack = (__u8 *) frame_ks;
194	t->ustack = (__u8 *) frame_us;	186	t->ustack = (__u8 *) frame_us;
195		187
196	context_save(&t->saved_context);	188	context_save(&t->saved_context);
197	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);	189	context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE);
198		190
199	the_initialize((the_t *) t->kstack);	191	the_initialize((the_t *) t->kstack);
200		192
201	ipl = interrupts_disable();	193	ipl = interrupts_disable();
202	t->saved_context.ipl = interrupts_read();	194	t->saved_context.ipl = interrupts_read();
203	interrupts_restore(ipl);	195	interrupts_restore(ipl);
204		196
205	t->thread_code = func;	197	t->thread_code = func;
206	t->thread_arg = arg;	198	t->thread_arg = arg;
207	t->ticks = -1;	199	t->ticks = -1;
208	t->priority = -1; /* start in rq[0] */	200	t->priority = -1; /* start in rq[0] */
209	t->cpu = NULL;	201	t->cpu = NULL;
210	t->flags = 0;	202	t->flags = 0;
211	t->state = Entering;	203	t->state = Entering;
212	t->call_me = NULL;	204	t->call_me = NULL;
213	t->call_me_with = NULL;	205	t->call_me_with = NULL;
214		206
215	timeout_initialize(&t->sleep_timeout);	207	timeout_initialize(&t->sleep_timeout);
216	t->sleep_queue = NULL;	208	t->sleep_queue = NULL;
217	t->timeout_pending = 0;	209	t->timeout_pending = 0;
218		210
219	t->rwlock_holder_type = RWLOCK_NONE;	211	t->rwlock_holder_type = RWLOCK_NONE;
220		212
221	t->task = task;	213	t->task = task;
222		214
223	t->fpu_context_exists=0;	215	t->fpu_context_exists=0;
224	t->fpu_context_engaged=0;	216	t->fpu_context_engaged=0;
225		217
226	/*	218	/*
227	* Register this thread in the system-wide list.	219	* Register this thread in the system-wide list.
228	*/	220	*/
229	ipl = interrupts_disable();	221	ipl = interrupts_disable();
230	spinlock_lock(&threads_lock);	222	spinlock_lock(&threads_lock);
231	list_append(&t->threads_link, &threads_head);	223	list_append(&t->threads_link, &threads_head);
232	spinlock_unlock(&threads_lock);	224	spinlock_unlock(&threads_lock);
233		225
234	/*	226	/*
235	* Attach to the containing task.	227	* Attach to the containing task.
236	*/	228	*/
237	spinlock_lock(&task->lock);	229	spinlock_lock(&task->lock);
238	list_append(&t->th_link, &task->th_head);	230	list_append(&t->th_link, &task->th_head);
239	spinlock_unlock(&task->lock);	231	spinlock_unlock(&task->lock);
240		232
241	interrupts_restore(ipl);	233	interrupts_restore(ipl);
242	}	234	}
243		235
244	return t;	236	return t;
245	}	237	}
246		238
247		239
248	/** Make thread exiting	240	/** Make thread exiting
249	*	241	*
250	* End current thread execution and switch it to the exiting	242	* End current thread execution and switch it to the exiting
251	* state. All pending timeouts are executed.	243	* state. All pending timeouts are executed.
252	*	244	*
253	*/	245	*/
254	void thread_exit(void)	246	void thread_exit(void)
255	{	247	{
256	ipl_t ipl;	248	ipl_t ipl;
257		249
258	restart:	250	restart:
259	ipl = interrupts_disable();	251	ipl = interrupts_disable();
260	spinlock_lock(&THREAD->lock);	252	spinlock_lock(&THREAD->lock);
261	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */	253	if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */
262	spinlock_unlock(&THREAD->lock);	254	spinlock_unlock(&THREAD->lock);
263	interrupts_restore(ipl);	255	interrupts_restore(ipl);
264	goto restart;	256	goto restart;
265	}	257	}
266	THREAD->state = Exiting;	258	THREAD->state = Exiting;
267	spinlock_unlock(&THREAD->lock);	259	spinlock_unlock(&THREAD->lock);
268	scheduler();	260	scheduler();
269	}	261	}
270		262
271		263
272	/** Thread sleep	264	/** Thread sleep
273	*	265	*
274	* Suspend execution of the current thread.	266	* Suspend execution of the current thread.
275	*	267	*
276	* @param sec Number of seconds to sleep.	268	* @param sec Number of seconds to sleep.
277	*	269	*
278	*/	270	*/
279	void thread_sleep(__u32 sec)	271	void thread_sleep(__u32 sec)
280	{	272	{
281	thread_usleep(sec*1000000);	273	thread_usleep(sec*1000000);
282	}	274	}
283		275
284		276
285	/** Thread usleep	277	/** Thread usleep
286	*	278	*
287	* Suspend execution of the current thread.	279	* Suspend execution of the current thread.
288	*	280	*
289	* @param usec Number of microseconds to sleep.	281	* @param usec Number of microseconds to sleep.
290	*	282	*
291	*/	283	*/
292	void thread_usleep(__u32 usec)	284	void thread_usleep(__u32 usec)
293	{	285	{
294	waitq_t wq;	286	waitq_t wq;
295		287
296	waitq_initialize(&wq);	288	waitq_initialize(&wq);
297		289
298	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);	290	(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING);
299	}	291	}
300		292
301		293
302	/** Register thread out-of-context invocation	294	/** Register thread out-of-context invocation
303	*	295	*
304	* Register a function and its argument to be executed	296	* Register a function and its argument to be executed
305	* on next context switch to the current thread.	297	* on next context switch to the current thread.
306	*	298	*
307	* @param call_me Out-of-context function.	299	* @param call_me Out-of-context function.
308	* @param call_me_with Out-of-context function argument.	300	* @param call_me_with Out-of-context function argument.
309	*	301	*
310	*/	302	*/
311	void thread_register_call_me(void (* call_me)(void ), void call_me_with)	303	void thread_register_call_me(void (* call_me)(void ), void call_me_with)
312	{	304	{
313	ipl_t ipl;	305	ipl_t ipl;
314		306
315	ipl = interrupts_disable();	307	ipl = interrupts_disable();
316	spinlock_lock(&THREAD->lock);	308	spinlock_lock(&THREAD->lock);
317	THREAD->call_me = call_me;	309	THREAD->call_me = call_me;
318	THREAD->call_me_with = call_me_with;	310	THREAD->call_me_with = call_me_with;
319	spinlock_unlock(&THREAD->lock);	311	spinlock_unlock(&THREAD->lock);
320	interrupts_restore(ipl);	312	interrupts_restore(ipl);
321	}	313	}
322		314
323	/** Print list of threads debug info */	315	/** Print list of threads debug info */
324	void thread_print_list(void)	316	void thread_print_list(void)
325	{	317	{
326	link_t *cur;	318	link_t *cur;
327	thread_t *t;	319	thread_t *t;
328	ipl_t ipl;	320	ipl_t ipl;
329		321
330	/* Messing with thread structures, avoid deadlock */	322	/* Messing with thread structures, avoid deadlock */
331	ipl = interrupts_disable();	323	ipl = interrupts_disable();
332	spinlock_lock(&threads_lock);	324	spinlock_lock(&threads_lock);
333		325
334	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {	326	for (cur=threads_head.next; cur!=&threads_head; cur=cur->next) {
335	t = list_get_instance(cur, thread_t, threads_link);	327	t = list_get_instance(cur, thread_t, threads_link);
336	printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);	328	printf("Thr: %d(%s) ", t->tid, thread_states[t->state]);
337	if (t->cpu)	329	if (t->cpu)
338	printf("cpu%d ", t->cpu->id);	330	printf("cpu%d ", t->cpu->id);
339		331
340	printf("\n");	332	printf("\n");
341	}	333	}
342		334
343	spinlock_unlock(&threads_lock);	335	spinlock_unlock(&threads_lock);
344	interrupts_enable();	336	interrupts_enable();
345	}	337	}
346		338

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/proc/thread.c @ 1735 – Rev 777 → 783