Mercurial > sdl-ios-xcode
view src/thread/nds/SDL_sysmutex.c @ 4451:033c455bbe99
Refactored automated rwops tests so read and write directories can be more easily customized.
The refactored tests were written in recognition that Mac and iPhone current working directories are usually not going to work. Resource directories are in bundles and write directories are restricted to certain areas. In theory, other platforms may have this problem too, hence the refactoring.
Also updated the Xcode iPhone project to use 3.2 as the Base SDK, but 3.1 as the Deployment SDK (for iPhone/iPad compatibility.)
author | Eric Wing <ewing . public |-at-| gmail . com> |
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date | Sun, 09 May 2010 06:58:30 -0700 |
parents | f7b03b6838cb |
children | b530ef003506 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2010 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #ifdef SAVE_RCSID static char rcsid = "@(#) $Id: SDL_sysmutex.c,v 1.2 2001/04/26 16:50:18 hercules Exp $"; #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" struct SDL_mutex { int recursive; SDL_threadID owner; SDL_sem *sem; }; /* Create a mutex */ SDL_mutex * SDL_CreateMutex(void) { SDL_mutex *mutex; /* Allocate mutex memory */ mutex = (SDL_mutex *) malloc(sizeof(*mutex)); if (mutex) { /* Create the mutex semaphore, with initial value 1 */ mutex->sem = SDL_CreateSemaphore(1); mutex->recursive = 0; mutex->owner = 0; if (!mutex->sem) { free(mutex); mutex = NULL; } } else { SDL_OutOfMemory(); } return mutex; } /* Free the mutex */ void SDL_DestroyMutex(SDL_mutex * mutex) { if (mutex) { if (mutex->sem) { SDL_DestroySemaphore(mutex->sem); } free(mutex); } } /* Lock the semaphore */ int SDL_mutexP(SDL_mutex * mutex) { #ifdef DISABLE_THREADS return 0; #else SDL_threadID 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. */ SDL_SemWait(mutex->sem); 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; SDL_SemPost(mutex->sem); } return 0; #endif /* DISABLE_THREADS */ }