View Source: SDL_SemWait(3) - Waikato Linux Users Group

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SDL_!SemWait
!!!SDL_!SemWait
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
EXAMPLES
SEE ALSO
----
!!NAME


SDL_!SemWait- Lock a semaphore and suspend the thread if the semaphore value is zero.
!!SYNOPSIS


__#include
__


__int SDL_!SemWait__(__SDL_sem *sem__);
!!DESCRIPTION


__SDL_!SemWait()__ suspends the calling thread until
either the semaphore pointed to by __sem__ has a positive
value, the call is interrupted by a signal or error. If the
call is successful it will atomically decrement the
semaphore value.


After __SDL_!SemWait()__ is successful, the semaphore can
be released and its count atomically incremented by a
successful call to ''SDL_!SemPost''.
!!RETURN VALUE


Returns __0__ if successful or __-1__ if there was an
error (leaving the semaphore unchanged).
!!EXAMPLES


if (SDL_!SemWait(my_sem) == -1) {
return WAIT_FAILED;
}
...
SDL_!SemPost(my_sem);
!!SEE ALSO


__SDL_!CreateSemaphore__, __SDL_!DestroySemaphore__,
__SDL_!SemTryWait__, __SDL_!SemWaitTimeout__,
__SDL_!SemPost__, __SDL_!SemValue__
----

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Last edited on Monday, June 3, 2002 6:53:48 pm by "perry"

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