| /* |
| Copyright (C) 1997-2018 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); |
| } |