"SDL_SemWait" "3" "Tue 11 Sep 2001, 23:00" "SDL" "SDL API Reference"
"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 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
created by instant / docbook-to-man, Tue 11 Sep 2001, 23:00
