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SDL_SemWait(3)		       SDL API Reference		SDL_SemWait(3)

NAME
       SDL_SemWait  - Lock a semaphore and suspend the thread if the semaphore
       value is	zero.

SYNOPSIS
       #include	"SDL.h"	#include "SDL_thread.h"

       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	 sema-
       phore unchanged).

EXAMPLES
       if (SDL_SemWait(my_sem) == -1) {
	       return WAIT_FAILED;
       }

       ...

       SDL_SemPost(my_sem);

SEE ALSO
       SDL_CreateSemaphore, SDL_DestroySemaphore, SDL_SemTryWait, SDL_SemWait-
       Timeout,	SDL_SemPost, SDL_SemValue

SDL			    Tue	11 Sep 2001, 23:00		SDL_SemWait(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | EXAMPLES | SEE ALSO

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