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



 *
 * The sleep can be interrupted only if the
 * SYNCH_FLAGS_INTERRUPTIBLE bit is specified in flags.
 
 * If usec is greater than zero, regardless of the value of the
 * SYNCH_FLAGS_NON_BLOCKING bit in flags, the call will not return until either
 * timeout, interruption or wakeup comes.
 *
 * If usec is zero and the SYNCH_FLAGS_NON_BLOCKING bit is not set in flags,
 * the call will not return until wakeup or interruption comes.
 *
 * If usec is zero and the SYNCH_FLAGS_NON_BLOCKING bit is set in flags, the
 * call will immediately return, reporting either success or failure.
 *
 * @return One of: ESYNCH_WOULD_BLOCK, ESYNCH_TIMEOUT, ESYNCH_INTERRUPTED,
 * ESYNCH_OK_ATOMIC, ESYNCH_OK_BLOCKED.
 *
 * @li ESYNCH_WOULD_BLOCK means that the sleep failed because at the time of the
 * call there was no pending wakeup.
 *
 * @li ESYNCH_TIMEOUT means that the sleep timed out.
 *
 * @li ESYNCH_INTERRUPTED means that somebody interrupted the sleeping thread.
 *

            /* Short emulation of scheduler() return code. */
            spinlock_unlock(&THREAD->lock);
            return ESYNCH_TIMEOUT;
        }
        THREAD->timeout_pending = true;
        timeout_register(&THREAD->sleep_timeout, (uint64_t) usec,
            waitq_timeouted_sleep, THREAD);
    }
 
    list_append(&THREAD->wq_link, &wq->head);
 
    /*

    THREAD->state = Sleeping;
    THREAD->sleep_queue = wq;
 
    spinlock_unlock(&THREAD->lock);
 
    /* wq->lock is released in scheduler_separated_stack() */
    scheduler();
   
    return ESYNCH_OK_BLOCKED;
}
 
 
/** Wake up first thread sleeping in a wait queue
 *
 * Wake up first thread sleeping in a wait queue. This is the SMP- and IRQ-safe
 
 * wrapper meant for general use.
 *
 * Besides its 'normal' wakeup operation, it attempts to unregister possible
 * timeout.
 *
 * @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;
 

    interrupts_restore(ipl);   
}
 
/** Internal SMP- and IRQ-unsafe version of waitq_wakeup()
 *
 * This is the internal SMP- and IRQ-unsafe version of waitq_wakeup(). It
 
 * assumes wq->lock is already locked and interrupts are already disabled.
 *
 * @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;
 

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/src/synch/waitq.c @ 2071 – Rev 1787 → 2067

Rev 1787		Rev 2067
Line 186...		Line 186...
186	*	186	*
187	* The sleep can be interrupted only if the	187	* The sleep can be interrupted only if the
188	* SYNCH_FLAGS_INTERRUPTIBLE bit is specified in flags.	188	* SYNCH_FLAGS_INTERRUPTIBLE bit is specified in flags.
189		189
190	* If usec is greater than zero, regardless of the value of the	190	* If usec is greater than zero, regardless of the value of the
191	* SYNCH_FLAGS_NON_BLOCKING bit in flags, the call will not return until either timeout,	191	* SYNCH_FLAGS_NON_BLOCKING bit in flags, the call will not return until either
192	* interruption or wakeup comes.	192	* timeout, interruption or wakeup comes.
193	*	193	*
194	* If usec is zero and the SYNCH_FLAGS_NON_BLOCKING bit is not set in flags, the call	194	* If usec is zero and the SYNCH_FLAGS_NON_BLOCKING bit is not set in flags,
195	* will not return until wakeup or interruption comes.	195	* the call will not return until wakeup or interruption comes.
196	*	196	*
197	* If usec is zero and the SYNCH_FLAGS_NON_BLOCKING bit is set in flags, the call will	197	* If usec is zero and the SYNCH_FLAGS_NON_BLOCKING bit is set in flags, the
198	* immediately return, reporting either success or failure.	198	* call will immediately return, reporting either success or failure.
199	*	199	*
200	* @return Returns one of: ESYNCH_WOULD_BLOCK, ESYNCH_TIMEOUT, ESYNCH_INTERRUPTED,	200	* @return One of: ESYNCH_WOULD_BLOCK, ESYNCH_TIMEOUT, ESYNCH_INTERRUPTED,
201	* ESYNCH_OK_ATOMIC, ESYNCH_OK_BLOCKED.	201	* ESYNCH_OK_ATOMIC, ESYNCH_OK_BLOCKED.
202	*	202	*
203	* @li ESYNCH_WOULD_BLOCK means that the sleep failed because at the time	203	* @li ESYNCH_WOULD_BLOCK means that the sleep failed because at the time of the
204	* of the call there was no pending wakeup.	204	* call there was no pending wakeup.
205	*	205	*
206	* @li ESYNCH_TIMEOUT means that the sleep timed out.	206	* @li ESYNCH_TIMEOUT means that the sleep timed out.
207	*	207	*
208	* @li ESYNCH_INTERRUPTED means that somebody interrupted the sleeping thread.	208	* @li ESYNCH_INTERRUPTED means that somebody interrupted the sleeping thread.
209	*	209	*
Line 349...		Line 349...
349	/* Short emulation of scheduler() return code. */	349	/* Short emulation of scheduler() return code. */
350	spinlock_unlock(&THREAD->lock);	350	spinlock_unlock(&THREAD->lock);
351	return ESYNCH_TIMEOUT;	351	return ESYNCH_TIMEOUT;
352	}	352	}
353	THREAD->timeout_pending = true;	353	THREAD->timeout_pending = true;
354	timeout_register(&THREAD->sleep_timeout, (uint64_t) usec, waitq_timeouted_sleep, THREAD);	354	timeout_register(&THREAD->sleep_timeout, (uint64_t) usec,
-		355	waitq_timeouted_sleep, THREAD);
355	}	356	}
356		357
357	list_append(&THREAD->wq_link, &wq->head);	358	list_append(&THREAD->wq_link, &wq->head);
358		359
359	/*	360	/*
Line 362...		Line 363...
362	THREAD->state = Sleeping;	363	THREAD->state = Sleeping;
363	THREAD->sleep_queue = wq;	364	THREAD->sleep_queue = wq;
364		365
365	spinlock_unlock(&THREAD->lock);	366	spinlock_unlock(&THREAD->lock);
366		367
367	scheduler(); /* wq->lock is released in scheduler_separated_stack() */	368	/* wq->lock is released in scheduler_separated_stack() */
-		369	scheduler();
368		370
369	return ESYNCH_OK_BLOCKED;	371	return ESYNCH_OK_BLOCKED;
370	}	372	}
371		373
372		374
373	/** Wake up first thread sleeping in a wait queue	375	/** Wake up first thread sleeping in a wait queue
374	*	376	*
375	* Wake up first thread sleeping in a wait queue.	377	* Wake up first thread sleeping in a wait queue. This is the SMP- and IRQ-safe
376	* This is the SMP- and IRQ-safe wrapper meant for	-
377	* general use.	378	* wrapper meant for general use.
378	*	379	*
379	* Besides its 'normal' wakeup operation, it attempts	380	* Besides its 'normal' wakeup operation, it attempts to unregister possible
380	* to unregister possible timeout.	381	* timeout.
381	*	382	*
382	* @param wq Pointer to wait queue.	383	* @param wq Pointer to wait queue.
383	* @param all If this is non-zero, all sleeping threads	384	* @param all If this is non-zero, all sleeping threads will be woken up and
384	* will be woken up and missed count will be zeroed.	385	* missed count will be zeroed.
385	*/	386	*/
386	void waitq_wakeup(waitq_t *wq, bool all)	387	void waitq_wakeup(waitq_t *wq, bool all)
387	{	388	{
388	ipl_t ipl;	389	ipl_t ipl;
389		390
Line 396...		Line 397...
396	interrupts_restore(ipl);	397	interrupts_restore(ipl);
397	}	398	}
398		399
399	/** Internal SMP- and IRQ-unsafe version of waitq_wakeup()	400	/** Internal SMP- and IRQ-unsafe version of waitq_wakeup()
400	*	401	*
401	* This is the internal SMP- and IRQ-unsafe version	402	* This is the internal SMP- and IRQ-unsafe version of waitq_wakeup(). It
402	* of waitq_wakeup(). It assumes wq->lock is already	-
403	* locked and interrupts are already disabled.	403	* assumes wq->lock is already locked and interrupts are already disabled.
404	*	404	*
405	* @param wq Pointer to wait queue.	405	* @param wq Pointer to wait queue.
406	* @param all If this is non-zero, all sleeping threads	406	* @param all If this is non-zero, all sleeping threads will be woken up and
407	* will be woken up and missed count will be zeroed.	407	* missed count will be zeroed.
408	*/	408	*/
409	void _waitq_wakeup_unsafe(waitq_t *wq, bool all)	409	void _waitq_wakeup_unsafe(waitq_t *wq, bool all)
410	{	410	{
411	thread_t *t;	411	thread_t *t;
412		412