Mercurial > sdl-ios-xcode
view src/thread/os2/SDL_sysmutex.c @ 4347:38f22ed3a433 SDL-1.2
Option to fix bug #851
For some people setting the period size works better (and is what SDL 1.2.13 did), but for most people it's the same or worse. You can use an environment variable to pick which one you want.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 17 Oct 2009 06:55:17 +0000 |
parents | a1b03ba2fcd0 |
children |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2009 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 */ #include "SDL_config.h" /* Mutex functions using the OS/2 API */ #define INCL_DOSERRORS #define INCL_DOSSEMAPHORES #include <os2.h> #include "SDL_mutex.h" struct SDL_mutex { HMTX hmtxID; }; /* Create a mutex */ DECLSPEC SDL_mutex * SDLCALL SDL_CreateMutex(void) { SDL_mutex *mutex; APIRET ulrc; /* Allocate mutex memory */ mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex)); if (mutex) { /* Create the mutex, with initial value signaled */ ulrc = DosCreateMutexSem(NULL, // Create unnamed semaphore &(mutex->hmtxID), // Pointer to handle 0L, // Flags: create it private (not shared) FALSE); // Initial value: unowned if (ulrc!=NO_ERROR) { SDL_SetError("Couldn't create mutex"); SDL_free(mutex); mutex = NULL; } } else { SDL_OutOfMemory(); } return(mutex); } /* Free the mutex */ DECLSPEC void SDLCALL SDL_DestroyMutex(SDL_mutex *mutex) { if ( mutex ) { if ( mutex->hmtxID ) { DosCloseMutexSem(mutex->hmtxID); mutex->hmtxID = 0; } SDL_free(mutex); } } /* Lock the mutex */ DECLSPEC int SDLCALL SDL_mutexP(SDL_mutex *mutex) { if ( mutex == NULL ) { SDL_SetError("Passed a NULL mutex"); return -1; } if ( DosRequestMutexSem(mutex->hmtxID, SEM_INDEFINITE_WAIT) != NO_ERROR ) { SDL_SetError("Couldn't wait on mutex"); return -1; } return(0); } /* Unlock the mutex */ DECLSPEC int SDLCALL SDL_mutexV(SDL_mutex *mutex) { if ( mutex == NULL ) { SDL_SetError("Passed a NULL mutex"); return -1; } if ( DosReleaseMutexSem(mutex->hmtxID) != NO_ERROR ) { SDL_SetError("Couldn't release mutex"); return -1; } return(0); }