Mercurial > sdl-ios-xcode
view src/thread/dc/SDL_sysmutex.c @ 641:df178851293b
Date: 28 Jun 2003 22:42:52 +0100
From: Alan Swanson
Subject: Re: [SDL] New XFree 4.3 Video Mode Patch
I have a wee amendment that moves the qsort in set_best_resolution
to only occur after failing to find an exact match only. This would
make absolutely sure we get a user set mode.
While I've never had any problems for my normal resolutions (1280x1024,
1024x768, 800x600 & 640,480) while closely examining the output from
qsort I've noticed it doesn't seem to sort the modes fully. These is
one definite wrong at 1152x768 and a few that just look wrong to me.
From a program (attached) I made to examine this more easily. X has
sorted its mode list using the same method as ours (plus frequency),
and our user modes get inserted without any other movement.
On the patch I've made I've also changed cmpmodes to sort on vertical
resolution and then horizontal. Ie vertical is now most significant
bit.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sat, 28 Jun 2003 21:52:26 +0000 |
parents | dad72daf44b3 |
children | b8d311d90021 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with this library; if not, write to the Free Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA BERO bero@geocities.co.jp based on generic/SDL_sysmutex.c Sam Lantinga slouken@libsdl.org */ #ifdef SAVE_RCSID static char rcsid = "@(#) $Id$"; #endif /* An implementation of mutexes using semaphores */ #include <stdio.h> #include <stdlib.h> #include "SDL_error.h" #include "SDL_thread.h" #include "SDL_systhread_c.h" #include <arch/spinlock.h> struct SDL_mutex { int recursive; Uint32 owner; spinlock_t mutex; }; /* Create a mutex */ SDL_mutex *SDL_CreateMutex(void) { SDL_mutex *mutex; /* Allocate mutex memory */ mutex = (SDL_mutex *)malloc(sizeof(*mutex)); if ( mutex ) { spinlock_init(&mutex->mutex); mutex->recursive = 0; mutex->owner = 0; } else { SDL_OutOfMemory(); } return mutex; } /* Free the mutex */ void SDL_DestroyMutex(SDL_mutex *mutex) { if ( mutex ) { free(mutex); } } /* Lock the semaphore */ int SDL_mutexP(SDL_mutex *mutex) { #ifdef DISABLE_THREADS return 0; #else Uint32 this_thread; if ( mutex == NULL ) { SDL_SetError("Passed a NULL mutex"); return -1; } this_thread = SDL_ThreadID(); if ( mutex->owner == this_thread ) { ++mutex->recursive; } else { /* The order of operations is important. We set the locking thread id after we obtain the lock so unlocks from other threads will fail. */ spinlock_lock(&mutex->mutex); mutex->owner = this_thread; mutex->recursive = 0; } return 0; #endif /* DISABLE_THREADS */ } /* Unlock the mutex */ int SDL_mutexV(SDL_mutex *mutex) { #ifdef DISABLE_THREADS return 0; #else if ( mutex == NULL ) { SDL_SetError("Passed a NULL mutex"); return -1; } /* If we don't own the mutex, we can't unlock it */ if ( SDL_ThreadID() != mutex->owner ) { SDL_SetError("mutex not owned by this thread"); return -1; } if ( mutex->recursive ) { --mutex->recursive; } else { /* The order of operations is important. First reset the owner so another thread doesn't lock the mutex and set the ownership before we reset it, then release the lock semaphore. */ mutex->owner = 0; spinlock_unlock(&mutex->mutex); } return 0; #endif /* DISABLE_THREADS */ }