Mercurial > sdl-ios-xcode
diff test/testsem.c @ 5108:d547877e355e
Colin Leroy 2011-01-26 04:24:20 PST
the pthread implementation of SDL_SemWaitTimeout() uses busy waiting, while
pthread's sem_timedwait() does work. Attached are patches that make use of it
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 27 Jan 2011 00:34:12 -0800 |
| parents | c121d94672cb |
| children |
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--- a/test/testsem.c Thu Jan 27 00:19:46 2011 -0800 +++ b/test/testsem.c Thu Jan 27 00:34:12 2011 -0800 @@ -39,6 +39,29 @@ alive = 0; } +static void +TestWaitTimeout(void) +{ + Uint32 start_ticks; + Uint32 end_ticks; + Uint32 duration; + + sem = SDL_CreateSemaphore(0); + printf("Waiting 2 seconds on semaphore\n"); + + start_ticks = SDL_GetTicks(); + SDL_SemWaitTimeout(sem, 2000); + end_ticks = SDL_GetTicks(); + + duration = end_ticks - start_ticks; + + /* Accept a little offset in the effective wait */ + if (duration > 1900 && duration < 2050) + printf("Wait done.\n"); + else + fprintf(stderr, "Wait took %d milliseconds\n", duration); +} + int main(int argc, char **argv) { @@ -81,6 +104,9 @@ printf("Finished waiting for threads\n"); SDL_DestroySemaphore(sem); + + TestWaitTimeout(); + SDL_Quit(); return (0); }