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wait_on_prepare and wait_on_prepared_wait with preemption considered

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This commit is contained in:
Bahadir Balban
2009-06-10 15:48:34 +03:00
parent 7ef479733f
commit 4e43d09325
2 changed files with 13 additions and 13 deletions
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12
src/api/mutex.c
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@@ -172,17 +172,11 @@ int mutex_control_lock(unsigned long mutex_address)
/* Prepare to wait on the contenders queue */
CREATE_WAITQUEUE_ON_STACK(wq, current);
/* Disable to protect from sleeping by preemption */
preempt_disable();
wait_on_prepare(&mutex_queue->wqh_contenders, &wq);
/* Release lock */
mutex_queue_head_unlock();
/* Now safe to sleep voluntarily or by preemption */
preempt_enable();
/* Initiate prepared wait */
return wait_on_prepared_wait();
}
@@ -222,18 +216,12 @@ int mutex_control_unlock(unsigned long mutex_address)
/* Prepare to wait on the lock holders queue */
CREATE_WAITQUEUE_ON_STACK(wq, current);
/* Disable to protect from sleeping by preemption */
preempt_disable();
/* Prepare to wait */
wait_on_prepare(&mutex_queue->wqh_holders, &wq);
/* Release lock first */
mutex_queue_head_unlock();
/* Now safe to sleep voluntarily or by preemption */
preempt_enable();
/* Initiate prepared wait */
return wait_on_prepared_wait();
}