mirror of
https://github.com/Relintai/sdl2_frt.git
synced 2024-12-16 11:06:49 +01:00
816a6e68e5
Michael Sartain
This is a quick pass at adding Linux RealtimeKit thread priority support to SDL.
It allows me to bump the thread priority to high without root privileges or setting any caps, etc.
rtkit readme here:
http://git.0pointer.net/rtkit.git/tree/README
130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
/*
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Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely.
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*/
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/* Simple test of the SDL threading code */
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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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static SDL_TLSID tls;
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static int alive = 0;
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static int testprio = 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
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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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static const char *
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getprioritystr(SDL_ThreadPriority priority)
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{
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switch(priority)
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{
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case SDL_THREAD_PRIORITY_LOW: return "SDL_THREAD_PRIORITY_LOW";
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case SDL_THREAD_PRIORITY_NORMAL: return "SDL_THREAD_PRIORITY_NORMAL";
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case SDL_THREAD_PRIORITY_HIGH: return "SDL_THREAD_PRIORITY_HIGH";
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}
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return "???";
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}
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int SDLCALL
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ThreadFunc(void *data)
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{
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SDL_ThreadPriority prio = SDL_THREAD_PRIORITY_NORMAL;
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SDL_TLSSet(tls, "baby thread", NULL);
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SDL_Log("Started thread %s: My thread id is %lu, thread data = %s\n",
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(char *) data, SDL_ThreadID(), (const char *)SDL_TLSGet(tls));
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while (alive) {
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SDL_Log("Thread '%s' is alive!\n", (char *) data);
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if (testprio) {
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SDL_Log("SDL_SetThreadPriority(%s):%d\n", getprioritystr(prio), SDL_SetThreadPriority(prio));
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if (++prio > SDL_THREAD_PRIORITY_HIGH)
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prio = SDL_THREAD_PRIORITY_LOW;
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}
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SDL_Delay(1 * 1000);
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}
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SDL_Log("Thread '%s' exiting!\n", (char *) data);
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return (0);
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}
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static void
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killed(int sig)
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{
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SDL_Log("Killed with SIGTERM, waiting 5 seconds to exit\n");
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SDL_Delay(5 * 1000);
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alive = 0;
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quit(0);
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}
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int
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main(int argc, char *argv[])
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{
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int arg = 1;
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SDL_Thread *thread;
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/* Enable standard application logging */
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SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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/* Load the SDL library */
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if (SDL_Init(0) < 0) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
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return (1);
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}
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while (argv[arg] && *argv[arg] == '-') {
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if (SDL_strcmp(argv[arg], "--prio") == 0) {
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testprio = 1;
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}
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++arg;
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}
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tls = SDL_TLSCreate();
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SDL_assert(tls);
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SDL_TLSSet(tls, "main thread", NULL);
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SDL_Log("Main thread data initially: %s\n", (const char *)SDL_TLSGet(tls));
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alive = 1;
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thread = SDL_CreateThread(ThreadFunc, "One", "#1");
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if (thread == NULL) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "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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SDL_Log("Waiting for thread #1\n");
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alive = 0;
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SDL_WaitThread(thread, NULL);
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SDL_Log("Main thread data finally: %s\n", (const char *)SDL_TLSGet(tls));
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alive = 1;
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signal(SIGTERM, killed);
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thread = SDL_CreateThread(ThreadFunc, "Two", "#2");
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if (thread == NULL) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread: %s\n", SDL_GetError());
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quit(1);
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}
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raise(SIGTERM);
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SDL_Quit(); /* Never reached */
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return (0); /* Never reached */
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}
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