Mercurial > sdl-ios-xcode
view test/testlock.c @ 809:dba98fb391e7
Date: Tue, 13 Jan 2004 19:25:37 +0300
From: Dmitry Yakimov
Subject: [SDL] [PATCH] SDL bug patch
Let me introduce 2 fixes to SDL.
1. Preventing great slowdown on fast machines while hardware
flipping (it's obviously bug).
2. Setting up 85 Hz of monitor if supported. The reason is that
Win98 by default sets lowest frequency 60 Hz.
And we can't set up maximum frequency because some users can have
wrong monitor drivers.
This is important for shareware and commercial programs.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Wed, 11 Feb 2004 16:10:16 +0000 |
parents | 74212992fb08 |
children | be9c9c8f6d53 |
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/* Test the thread and mutex locking functions Also exercises the system's signal/thread interaction */ #include <signal.h> #include <stdio.h> #include <stdlib.h> #include "SDL.h" #include "SDL_mutex.h" #include "SDL_thread.h" static SDL_mutex *mutex = NULL; static Uint32 mainthread; static SDL_Thread *threads[6]; void printid(void) { printf("Process %u: exiting\n", SDL_ThreadID()); } void terminate(int sig) { printf("Process %u: raising SIGTERM\n", SDL_ThreadID()); raise(SIGTERM); } void closemutex(int sig) { Uint32 id = SDL_ThreadID(); int i; printf("Process %u: Cleaning up...\n", id == mainthread ? 0 : id); for ( i=0; i<6; ++i ) SDL_KillThread(threads[i]); SDL_DestroyMutex(mutex); exit(sig); } int Run(void *data) { if ( SDL_ThreadID() == mainthread ) signal(SIGTERM, closemutex); while ( 1 ) { printf("Process %u ready to work\n", SDL_ThreadID()); if ( SDL_mutexP(mutex) < 0 ) { fprintf(stderr, "Couldn't lock mutex: %s", SDL_GetError()); exit(1); } printf("Process %u, working!\n", SDL_ThreadID()); SDL_Delay(1*1000); printf("Process %u, done!\n", SDL_ThreadID()); if ( SDL_mutexV(mutex) < 0 ) { fprintf(stderr, "Couldn't unlock mutex: %s", SDL_GetError()); exit(1); } /* If this sleep isn't done, then threads may starve */ SDL_Delay(10); } return(0); } int main(int argc, char *argv[]) { int i; int maxproc = 6; /* Load the SDL library */ if ( SDL_Init(0) < 0 ) { fprintf(stderr, "%s\n", SDL_GetError()); exit(1); } atexit(SDL_Quit); if ( (mutex=SDL_CreateMutex()) == NULL ) { fprintf(stderr, "Couldn't create mutex: %s\n", SDL_GetError()); exit(1); } mainthread = SDL_ThreadID(); printf("Main thread: %u\n", mainthread); atexit(printid); for ( i=0; i<maxproc; ++i ) { if ( (threads[i]=SDL_CreateThread(Run, NULL)) == NULL ) fprintf(stderr, "Couldn't create thread!\n"); } signal(SIGINT, terminate); Run(NULL); return(0); /* Never reached */ }