WebSVN – HelenOS-historic – Diff – /kernel/trunk/generic/src/synch/waitq.c



#include <synch/spinlock.h>
#include <proc/thread.h>
#include <proc/scheduler.h>
#include <arch/asm.h>
#include <arch/types.h>
#include <typedefs.h>
#include <time/timeout.h>
#include <arch.h>
#include <context.h>
#include <list.h>
 

 */
void waitq_interrupted_sleep(void *data)
{
    thread_t *t = (thread_t *) data;
    waitq_t *wq;
    bool do_wakeup = false;
 
    spinlock_lock(&threads_lock);
    if (!list_member(&t->threads_link, &threads_head))
        goto out;
 
grab_locks:
    spinlock_lock(&t->lock);
    if (wq = t->sleep_queue) {      /* assignment */
        if (!spinlock_trylock(&wq->lock)) {
            spinlock_unlock(&t->lock);
            goto grab_locks;    /* avoid deadlock */
        }
 
        list_remove(&t->wq_link);
        t->saved_context = t->sleep_timeout_context;
        do_wakeup = true;
       
        spinlock_unlock(&wq->lock);
        t->sleep_queue = NULL;
    }
   
    t->timeout_pending = false;
    spinlock_unlock(&t->lock);
   
    if (do_wakeup)
        thread_ready(t);
 
out:
    spinlock_unlock(&threads_lock);
}
 

            before_thread_runs();
            spinlock_unlock(&THREAD->lock);
            interrupts_restore(ipl);
            return ESYNCH_TIMEOUT;
        }
        THREAD->timeout_pending = true;
        timeout_register(&THREAD->sleep_timeout, (__u64) usec, waitq_interrupted_sleep, THREAD);
    }
 
    list_append(&THREAD->wq_link, &wq->head);
 

 *
 * @param wq Pointer to wait queue.
 * @param all If this is non-zero, all sleeping threads
 *        will be woken up and missed count will be zeroed.
 */
void waitq_wakeup(waitq_t *wq, bool all)
{
    ipl_t ipl;
 
    ipl = interrupts_disable();
    spinlock_lock(&wq->lock);

 *
 * @param wq Pointer to wait queue.
 * @param all If this is non-zero, all sleeping threads
 *        will be woken up and missed count will be zeroed.
 */
void _waitq_wakeup_unsafe(waitq_t *wq, bool all)
{
    thread_t *t;
 
loop:  
    if (list_empty(&wq->head)) {
        wq->missed_wakeups++;
        if (all)
            wq->missed_wakeups = 0;
        return;
    }
 
    t = list_get_instance(wq->head.next, thread_t, wq_link);
   
    list_remove(&t->wq_link);
    spinlock_lock(&t->lock);
    if (t->timeout_pending && timeout_unregister(&t->sleep_timeout))
        t->timeout_pending = false;
    t->sleep_queue = NULL;
    spinlock_unlock(&t->lock);
 
    thread_ready(t);
 
    if (all)
        goto loop;
}

Rev 552	Rev 557
Line 31...	Line 31...
31	#include <synch/spinlock.h>	31	#include <synch/spinlock.h>
32	#include <proc/thread.h>	32	#include <proc/thread.h>
33	#include <proc/scheduler.h>	33	#include <proc/scheduler.h>
34	#include <arch/asm.h>	34	#include <arch/asm.h>
35	#include <arch/types.h>	35	#include <arch/types.h>
-		36	#include <typedefs.h>
36	#include <time/timeout.h>	37	#include <time/timeout.h>
37	#include <arch.h>	38	#include <arch.h>
38	#include <context.h>	39	#include <context.h>
39	#include <list.h>	40	#include <list.h>
40		41
Line 65...	Line 66...
65	*/	66	*/
66	void waitq_interrupted_sleep(void *data)	67	void waitq_interrupted_sleep(void *data)
67	{	68	{
68	thread_t t = (thread_t ) data;	69	thread_t t = (thread_t ) data;
69	waitq_t *wq;	70	waitq_t *wq;
70	int do_wakeup = 0;	71	bool do_wakeup = false;
71		72
72	spinlock_lock(&threads_lock);	73	spinlock_lock(&threads_lock);
73	if (!list_member(&t->threads_link, &threads_head))	74	if (!list_member(&t->threads_link, &threads_head))
74	goto out;	75	goto out;
75		76
76	grab_locks:	77	grab_locks:
77	spinlock_lock(&t->lock);	78	spinlock_lock(&t->lock);
78	if (wq = t->sleep_queue) {	79	if (wq = t->sleep_queue) { /* assignment */
79	if (!spinlock_trylock(&wq->lock)) {	80	if (!spinlock_trylock(&wq->lock)) {
80	spinlock_unlock(&t->lock);	81	spinlock_unlock(&t->lock);
81	goto grab_locks; /* avoid deadlock */	82	goto grab_locks; /* avoid deadlock */
82	}	83	}
83		84
84	list_remove(&t->wq_link);	85	list_remove(&t->wq_link);
85	t->saved_context = t->sleep_timeout_context;	86	t->saved_context = t->sleep_timeout_context;
86	do_wakeup = 1;	87	do_wakeup = true;
87		88
88	spinlock_unlock(&wq->lock);	89	spinlock_unlock(&wq->lock);
89	t->sleep_queue = NULL;	90	t->sleep_queue = NULL;
90	}	91	}
91		92
92	t->timeout_pending = 0;	93	t->timeout_pending = false;
93	spinlock_unlock(&t->lock);	94	spinlock_unlock(&t->lock);
94		95
-		96	if (do_wakeup)
95	if (do_wakeup) thread_ready(t);	97	thread_ready(t);
96		98
97	out:	99	out:
98	spinlock_unlock(&threads_lock);	100	spinlock_unlock(&threads_lock);
99	}	101	}
100		102
Line 191...	Line 193...
191	before_thread_runs();	193	before_thread_runs();
192	spinlock_unlock(&THREAD->lock);	194	spinlock_unlock(&THREAD->lock);
193	interrupts_restore(ipl);	195	interrupts_restore(ipl);
194	return ESYNCH_TIMEOUT;	196	return ESYNCH_TIMEOUT;
195	}	197	}
196	THREAD->timeout_pending = 1;	198	THREAD->timeout_pending = true;
197	timeout_register(&THREAD->sleep_timeout, (__u64) usec, waitq_interrupted_sleep, THREAD);	199	timeout_register(&THREAD->sleep_timeout, (__u64) usec, waitq_interrupted_sleep, THREAD);
198	}	200	}
199		201
200	list_append(&THREAD->wq_link, &wq->head);	202	list_append(&THREAD->wq_link, &wq->head);
201		203
Line 225...	Line 227...
225	*	227	*
226	* @param wq Pointer to wait queue.	228	* @param wq Pointer to wait queue.
227	* @param all If this is non-zero, all sleeping threads	229	* @param all If this is non-zero, all sleeping threads
228	* will be woken up and missed count will be zeroed.	230	* will be woken up and missed count will be zeroed.
229	*/	231	*/
230	void waitq_wakeup(waitq_t *wq, int all)	232	void waitq_wakeup(waitq_t *wq, bool all)
231	{	233	{
232	ipl_t ipl;	234	ipl_t ipl;
233		235
234	ipl = interrupts_disable();	236	ipl = interrupts_disable();
235	spinlock_lock(&wq->lock);	237	spinlock_lock(&wq->lock);
Line 248...	Line 250...
248	*	250	*
249	* @param wq Pointer to wait queue.	251	* @param wq Pointer to wait queue.
250	* @param all If this is non-zero, all sleeping threads	252	* @param all If this is non-zero, all sleeping threads
251	* will be woken up and missed count will be zeroed.	253	* will be woken up and missed count will be zeroed.
252	*/	254	*/
253	void _waitq_wakeup_unsafe(waitq_t *wq, int all)	255	void _waitq_wakeup_unsafe(waitq_t *wq, bool all)
254	{	256	{
255	thread_t *t;	257	thread_t *t;
256		258
257	loop:	259	loop:
258	if (list_empty(&wq->head)) {	260	if (list_empty(&wq->head)) {
259	wq->missed_wakeups++;	261	wq->missed_wakeups++;
-		262	if (all)
260	if (all) wq->missed_wakeups = 0;	263	wq->missed_wakeups = 0;
261	return;	264	return;
262	}	265	}
263		266
264	t = list_get_instance(wq->head.next, thread_t, wq_link);	267	t = list_get_instance(wq->head.next, thread_t, wq_link);
265		268
266	list_remove(&t->wq_link);	269	list_remove(&t->wq_link);
267	spinlock_lock(&t->lock);	270	spinlock_lock(&t->lock);
268	if (t->timeout_pending && timeout_unregister(&t->sleep_timeout))	271	if (t->timeout_pending && timeout_unregister(&t->sleep_timeout))
269	t->timeout_pending = 0;	272	t->timeout_pending = false;
270	t->sleep_queue = NULL;	273	t->sleep_queue = NULL;
271	spinlock_unlock(&t->lock);	274	spinlock_unlock(&t->lock);
272		275
273	thread_ready(t);	276	thread_ready(t);
274		277
-		278	if (all)
275	if (all) goto loop;	279	goto loop;
276	}	280	}

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/synch/waitq.c – Rev 552 → 557