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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 sema- phore 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_SemWaitTime- out, 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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