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Check for sem_timedwait(), which isn't available on some systems (including OpenBSD

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This commit is contained in:
Sam Lantinga
2012-01-15 03:34:14 -05:00
parent d4c4a98f59
commit 243a72784f
4 changed files with 90 additions and 0 deletions
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14
src/thread/pthread/SDL_syssem.c
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@@ -103,8 +103,12 @@ int
SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
{
int retval;
#ifdef HAVE_SEM_TIMEDWAIT
struct timeval now;
struct timespec ts_timeout;
#else
Uint32 end;
#endif
if (!sem) {
SDL_SetError("Passed a NULL semaphore");
@@ -119,6 +123,7 @@ SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
return SDL_SemWait(sem);
}
#ifdef HAVE_SEM_TIMEDWAIT
/* Setup the timeout. sem_timedwait doesn't wait for
* a lapse of time, but until we reach a certain time.
* This time is now plus the timeout.
@@ -147,6 +152,15 @@ SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
if (retval < 0) {
SDL_SetError("sem_timedwait() failed");
}
#else
end = SDL_GetTicks() + timeout;
while ((retval = SDL_SemTryWait(sem)) == SDL_MUTEX_TIMEDOUT) {
if ((SDL_GetTicks() - end) >= 0) {
break;
}
SDL_Delay(0);
}
#endif /* HAVE_SEM_TIMEDWAIT */
return retval;
}