test/testsem.c
changeset 0 74212992fb08
child 1151 be9c9c8f6d53
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/testsem.c	Thu Apr 26 16:45:43 2001 +0000
@@ -0,0 +1,76 @@
+
+/* Simple test of the SDL semaphore code */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+
+#include "SDL.h"
+#include "SDL_thread.h"
+
+#define NUM_THREADS 10
+
+static SDL_sem *sem;
+int alive = 1;
+
+int ThreadFunc(void *data)
+{
+	while ( alive ) {
+		SDL_SemWait(sem);
+		fprintf(stderr, "Thread number %d has got the semaphore (value = %d)!\n", (int)data, SDL_SemValue(sem));
+		SDL_Delay(200);
+		SDL_SemPost(sem);
+		fprintf(stderr, "Thread number %d has released the semaphore (value = %d)!\n", (int)data, SDL_SemValue(sem));
+		SDL_Delay(1); /* For the scheduler */
+	}
+	printf("Thread number %d exiting.\n", (int)data);
+	return 0;
+}
+
+static void killed(int sig)
+{
+	alive = 0;
+}
+
+int main(int argc, char **argv)
+{
+	SDL_Thread *threads[NUM_THREADS];
+	int i, init_sem;
+
+	if(argc < 2) {
+		fprintf(stderr,"Usage: %s init_value\n", argv[0]);
+		exit(1);
+	}
+
+	/* Load the SDL library */
+	if ( SDL_Init(0) < 0 ) {
+		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
+		exit(1);
+	}
+	atexit(SDL_Quit);
+	signal(SIGTERM, killed);
+	signal(SIGINT, killed);
+	
+	init_sem = atoi(argv[1]);
+	sem = SDL_CreateSemaphore(init_sem);
+	
+	printf("Running %d threads, semaphore value = %d\n", NUM_THREADS, init_sem);
+	/* Create all the threads */
+	for( i = 0; i < NUM_THREADS; ++i ) {
+		threads[i] = SDL_CreateThread(ThreadFunc, (void*)i);
+	}
+
+	/* Wait 10 seconds */
+	SDL_Delay(10 * 1000);
+
+	/* Wait for all threads to finish */
+	printf("Waiting for threads to finish\n");
+	alive = 0;
+	for( i = 0; i < NUM_THREADS; ++i ) {
+		SDL_WaitThread(threads[i], NULL);
+	}
+	printf("Finished waiting for threads\n");
+
+	SDL_DestroySemaphore(sem);
+	return(0);
+}