test/testerror.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 21 Sep 2009 07:32:26 +0000
branchSDL-1.2
changeset 4209 62e86ab81e3c
parent 1769 290b5baf2fca
child 1662 782fd950bd46
child 1895 c121d94672cb
permissions -rw-r--r--
Fixed bug #570

SDL_SemWaitTimeout in src/thread/generic/SDL_syssem.c line 179 (SVN trunk):

--sem->count;

should be

if (retval == 0) {
--sem->count;
}

Without this, sem->count will underflow on timeout effectively breaking the
semaphore. It appears that the implementation has been wrong since the initial
revision.
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/* Simple test of the SDL threading code and error handling */
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include "SDL.h"
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#include "SDL_thread.h"
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static int alive = 0;
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/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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static void quit(int rc)
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{
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	SDL_Quit();
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	exit(rc);
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}
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int SDLCALL ThreadFunc(void *data)
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{
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	/* Set the child thread error string */
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	SDL_SetError("Thread %s (%d) had a problem: %s",
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			(char *)data, SDL_ThreadID(), "nevermind");
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	while ( alive ) {
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		printf("Thread '%s' is alive!\n", (char *)data);
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		SDL_Delay(1*1000);
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	}
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	printf("Child thread error string: %s\n", SDL_GetError());
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	return(0);
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}
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int main(int argc, char *argv[])
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{
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	SDL_Thread *thread;
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	/* Load the SDL library */
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	if ( SDL_Init(0) < 0 ) {
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		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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		return(1);
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	}
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	/* Set the error value for the main thread */
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	SDL_SetError("No worries");
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	alive = 1;
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	thread = SDL_CreateThread(ThreadFunc, "#1");
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	if ( thread == NULL ) {
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		fprintf(stderr, "Couldn't create thread: %s\n", SDL_GetError());
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		quit(1);
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	}
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	SDL_Delay(5*1000);
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	printf("Waiting for thread #1\n");
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	alive = 0;
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	SDL_WaitThread(thread, NULL);
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	printf("Main thread error string: %s\n", SDL_GetError());
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	SDL_Quit();
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	return(0);
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}