Re: mutex lock function pair?
Alan Cox (alan@lxorguk.ukuu.org.uk)
Fri, 10 Sep 1999 01:00:06 +0100 (BST)
> When 1st thread call mutex lock, it acquired lock and process the followed
> code. If other threads try to acquire same lock before the lock is
> released, those threads are put into sleep. When 1st thread finished
> process and releases lock through mutex unlock, all other sleeping threads
> which are waiting for the lock are waken and try to acquire the lock.
> Whoever gets the lock can be processed and others go back to sleep again.
> Those mutex lock/unlock pair provide protection for critical pass.
The Linux semaphores provide mutex locking. The calls being
down(&sem)
up(&sem)
and also
down_interruptible(&sem)
which allows for signals to interrupt .. ie
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