July 13
So Matthew created a new sleeping state, called TASK_KILLABLE; it behaves like TASK_UNINTERRUPTIBLE with the exception that fatal signals will interrupt the sleep.
With TASK_KILLABLE comes a new set of primitives for waiting for events and acquiring locks:
int wait_event_killable(wait_queue_t queue, condition);
long schedule_timeout_killable(signed long timeout);
int mutex_lock_killable(struct mutex *lock);
int wait_for_completion_killable(struct completion *comp);
int down_killable(struct semaphore *sem);
这个东西俺很多年前就想过，没想到还真实现了。2.6.25中应该已经有了
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