Mercurial > sdl-ios-xcode
view test/testlock.c @ 615:7ec821f3cbd0
Date: Thu, 17 Apr 2003 23:27:34 -0400
From: Darrell Walisser
Subject: Yet another OS X cursor bug
The synopsis:
1. Call SDL_ShowCursor(0);
2. Call SDL_SetVideoMode();
3. Call SDL_GetEvent();
3. Call SDL_ShowCursor(1);
The result: Sometimes the cursor doesn't come back! Ack! Oddly enough,
it does come back when mousing over the dock or clicking in the menu
bar. But that's besides the point.
The reason why this is happening is a flaw in the handling of
activation/deactivation events. The short explanation is that the
HideCursor() and ShowCursor() calls must be balanced, but if the cursor
was initially hidden, HideCursor() was called again on the activate
event - so now the next ShowCursor() fails (as does the next, and the
next, for some reason).
So, here's the patch. All it does is keep track of the
HideCursor()/ShowCursor() calls so that they will always be balanced.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sun, 20 Apr 2003 05:41:16 +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 */ }