testlock.c
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/*
Copyright (C) 1997-2016 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.
*/
/* Test the thread and mutex locking functions
Also exercises the system's signal/thread interaction
*/
#include <signal.h>
#include <stdio.h>
#include <stdlib.h> /* for atexit() */
#include "SDL.h"
static SDL_mutex *mutex = NULL;
static SDL_threadID mainthread;
static SDL_Thread *threads[6];
static volatile int doterminate = 0;
/*
* SDL_Quit() shouldn't be used with atexit() directly because
* calling conventions may differ...
*/
static void
SDL_Quit_Wrapper(void)
{
SDL_Quit();
}
void
printid(void)
{
SDL_Log("Process %lu: exiting\n", SDL_ThreadID());
}
void
terminate(int sig)
{
signal(SIGINT, terminate);
doterminate = 1;
}
void
closemutex(int sig)
{
SDL_threadID id = SDL_ThreadID();
int i;
SDL_Log("Process %lu: Cleaning up...\n", id == mainthread ? 0 : id);
doterminate = 1;
for (i = 0; i < 6; ++i)
SDL_WaitThread(threads[i], NULL);
SDL_DestroyMutex(mutex);
exit(sig);
}
int SDLCALL
Run(void *data)
{
if (SDL_ThreadID() == mainthread)
signal(SIGTERM, closemutex);
while (!doterminate) {
SDL_Log("Process %lu ready to work\n", SDL_ThreadID());
if (SDL_LockMutex(mutex) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't lock mutex: %s", SDL_GetError());
exit(1);
}
SDL_Log("Process %lu, working!\n", SDL_ThreadID());
SDL_Delay(1 * 1000);
SDL_Log("Process %lu, done!\n", SDL_ThreadID());
if (SDL_UnlockMutex(mutex) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't unlock mutex: %s", SDL_GetError());
exit(1);
}
/* If this sleep isn't done, then threads may starve */
SDL_Delay(10);
}
if (SDL_ThreadID() == mainthread && doterminate) {
SDL_Log("Process %lu: raising SIGTERM\n", SDL_ThreadID());
raise(SIGTERM);
}
return (0);
}
int
main(int argc, char *argv[])
{
int i;
int maxproc = 6;
/* Enable standard application logging */
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
/* Load the SDL library */
if (SDL_Init(0) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "%s\n", SDL_GetError());
exit(1);
}
atexit(SDL_Quit_Wrapper);
if ((mutex = SDL_CreateMutex()) == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create mutex: %s\n", SDL_GetError());
exit(1);
}
mainthread = SDL_ThreadID();
SDL_Log("Main thread: %lu\n", mainthread);
atexit(printid);
for (i = 0; i < maxproc; ++i) {
char name[64];
SDL_snprintf(name, sizeof (name), "Worker%d", i);
if ((threads[i] = SDL_CreateThread(Run, name, NULL)) == NULL)
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread!\n");
}
signal(SIGINT, terminate);
Run(NULL);
return (0); /* Never reached */
}
SDL_ThreadID
#define SDL_ThreadID
Definition: SDL_dynapi_overrides.h:479
SDL_LockMutex
#define SDL_LockMutex
Definition: SDL_dynapi_overrides.h:266
SDL_GetError
#define SDL_GetError
Definition: SDL_dynapi_overrides.h:119
SDL_CreateMutex
#define SDL_CreateMutex
Definition: SDL_dynapi_overrides.h:265
data
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1967
name
GLuint const GLchar * name
Definition: SDL_opengl_glext.h:660
printid
void printid(void)
Definition: testlock.c:39
mutex
static SDL_mutex * mutex
Definition: testlock.c:23
main
int main(int argc, char *argv[])
Definition: testlock.c:93
SDL_mutex
Definition: SDL_sysmutex.c:29
SDL_LogError
#define SDL_LogError
Definition: SDL_dynapi_overrides.h:42
SDL_Log
#define SDL_Log
Definition: SDL_dynapi_overrides.h:37
Run
int Run(void *data)
Definition: testlock.c:65
closemutex
void closemutex(int sig)
Definition: testlock.c:52
SDL_Quit
#define SDL_Quit
Definition: SDL_dynapi_overrides.h:64
SDL_LOG_PRIORITY_INFO
Definition: SDL_log.h:106
doterminate
static volatile int doterminate
Definition: testlock.c:26
SDL_CreateThread
#define SDL_CreateThread
Definition: SDL_dynapi_overrides.h:47
SDL_Delay
#define SDL_Delay
Definition: SDL_dynapi_overrides.h:490
i
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:42
SDL_LogSetPriority
#define SDL_LogSetPriority
Definition: SDL_dynapi_overrides.h:242
NULL
#define NULL
Definition: begin_code.h:143
threads
static SDL_Thread * threads[6]
Definition: testlock.c:25
SDL_DestroyMutex
#define SDL_DestroyMutex
Definition: SDL_dynapi_overrides.h:269
terminate
void terminate(int sig)
Definition: testlock.c:45
SDL_snprintf
#define SDL_snprintf
Definition: SDL_dynapi_overrides.h:46
SDL_Thread
Definition: SDL_thread_c.h:54
SDL_UnlockMutex
#define SDL_UnlockMutex
Definition: SDL_dynapi_overrides.h:268
SDL_Init
#define SDL_Init
Definition: SDL_dynapi_overrides.h:60
SDL_Quit_Wrapper
static void SDL_Quit_Wrapper(void)
Definition: testlock.c:33
SDL.h
SDLCALL
#define SDLCALL
Definition: SDL_internal.h:31
SDL_LOG_CATEGORY_APPLICATION
Definition: SDL_log.h:66
SDL_threadID
unsigned long SDL_threadID
Definition: SDL_thread.h:49
SDL_WaitThread
#define SDL_WaitThread
Definition: SDL_dynapi_overrides.h:482
mainthread
static SDL_threadID mainthread
Definition: testlock.c:24