131 lines
3.3 KiB
C
Executable File
131 lines
3.3 KiB
C
Executable File
/*
|
|
Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
|
|
|
|
This software is provided 'as-is', without any express or implied
|
|
warranty. In no event will the authors be held liable for any damages
|
|
arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely.
|
|
*/
|
|
|
|
/* Simple test of the SDL semaphore code */
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <signal.h>
|
|
|
|
#include "SDL.h"
|
|
|
|
#define NUM_THREADS 10
|
|
|
|
static SDL_sem *sem;
|
|
int alive = 1;
|
|
|
|
int SDLCALL
|
|
ThreadFunc(void *data)
|
|
{
|
|
int threadnum = (int) (uintptr_t) data;
|
|
while (alive) {
|
|
SDL_SemWait(sem);
|
|
SDL_Log("Thread number %d has got the semaphore (value = %d)!\n",
|
|
threadnum, SDL_SemValue(sem));
|
|
SDL_Delay(200);
|
|
SDL_SemPost(sem);
|
|
SDL_Log("Thread number %d has released the semaphore (value = %d)!\n",
|
|
threadnum, SDL_SemValue(sem));
|
|
SDL_Delay(1); /* For the scheduler */
|
|
}
|
|
SDL_Log("Thread number %d exiting.\n", threadnum);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
killed(int sig)
|
|
{
|
|
alive = 0;
|
|
}
|
|
|
|
static void
|
|
TestWaitTimeout(void)
|
|
{
|
|
Uint32 start_ticks;
|
|
Uint32 end_ticks;
|
|
Uint32 duration;
|
|
int retval;
|
|
|
|
sem = SDL_CreateSemaphore(0);
|
|
SDL_Log("Waiting 2 seconds on semaphore\n");
|
|
|
|
start_ticks = SDL_GetTicks();
|
|
retval = 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)
|
|
SDL_Log("Wait done.\n");
|
|
else
|
|
SDL_Log("Wait took %d milliseconds\n", duration);
|
|
|
|
/* Check to make sure the return value indicates timed out */
|
|
if (retval != SDL_MUTEX_TIMEDOUT)
|
|
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_SemWaitTimeout returned: %d; expected: %d\n", retval, SDL_MUTEX_TIMEDOUT);
|
|
}
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
SDL_Thread *threads[NUM_THREADS];
|
|
uintptr_t i;
|
|
int init_sem;
|
|
|
|
/* Enable standard application logging */
|
|
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
|
|
|
|
if (argc < 2) {
|
|
SDL_Log("Usage: %s init_value\n", argv[0]);
|
|
return (1);
|
|
}
|
|
|
|
/* Load the SDL library */
|
|
if (SDL_Init(0) < 0) {
|
|
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
|
|
return (1);
|
|
}
|
|
signal(SIGTERM, killed);
|
|
signal(SIGINT, killed);
|
|
|
|
init_sem = atoi(argv[1]);
|
|
sem = SDL_CreateSemaphore(init_sem);
|
|
|
|
SDL_Log("Running %d threads, semaphore value = %d\n", NUM_THREADS,
|
|
init_sem);
|
|
/* Create all the threads */
|
|
for (i = 0; i < NUM_THREADS; ++i) {
|
|
char name[64];
|
|
SDL_snprintf(name, sizeof (name), "Thread%u", (unsigned int) i);
|
|
threads[i] = SDL_CreateThread(ThreadFunc, name, (void *) i);
|
|
}
|
|
|
|
/* Wait 10 seconds */
|
|
SDL_Delay(10 * 1000);
|
|
|
|
/* Wait for all threads to finish */
|
|
SDL_Log("Waiting for threads to finish\n");
|
|
alive = 0;
|
|
for (i = 0; i < NUM_THREADS; ++i) {
|
|
SDL_WaitThread(threads[i], NULL);
|
|
}
|
|
SDL_Log("Finished waiting for threads\n");
|
|
|
|
SDL_DestroySemaphore(sem);
|
|
|
|
TestWaitTimeout();
|
|
|
|
SDL_Quit();
|
|
return (0);
|
|
}
|