684909fae2
--HG-- extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401362
107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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/* Mutex functions using the OS/2 API */
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#define INCL_DOSERRORS
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#define INCL_DOSSEMAPHORES
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#include <os2.h>
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#include "SDL_mutex.h"
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struct SDL_mutex {
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HMTX hmtxID;
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};
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/* Create a mutex */
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DECLSPEC SDL_mutex * SDLCALL SDL_CreateMutex(void)
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{
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SDL_mutex *mutex;
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APIRET ulrc;
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/* Allocate mutex memory */
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mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex));
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if (mutex)
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{
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/* Create the mutex, with initial value signaled */
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ulrc = DosCreateMutexSem(NULL, // Create unnamed semaphore
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&(mutex->hmtxID), // Pointer to handle
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0L, // Flags: create it private (not shared)
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FALSE); // Initial value: unowned
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if (ulrc!=NO_ERROR)
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{
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SDL_SetError("Couldn't create mutex");
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SDL_free(mutex);
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mutex = NULL;
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}
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} else {
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SDL_OutOfMemory();
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}
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return(mutex);
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}
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/* Free the mutex */
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DECLSPEC void SDLCALL SDL_DestroyMutex(SDL_mutex *mutex)
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{
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if ( mutex )
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{
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if ( mutex->hmtxID )
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{
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DosCloseMutexSem(mutex->hmtxID);
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mutex->hmtxID = 0;
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}
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SDL_free(mutex);
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}
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}
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/* Lock the mutex */
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DECLSPEC int SDLCALL SDL_mutexP(SDL_mutex *mutex)
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{
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if ( mutex == NULL )
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{
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SDL_SetError("Passed a NULL mutex");
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return -1;
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}
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if ( DosRequestMutexSem(mutex->hmtxID, SEM_INDEFINITE_WAIT) != NO_ERROR )
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{
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SDL_SetError("Couldn't wait on mutex");
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return -1;
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}
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return(0);
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}
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/* Unlock the mutex */
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DECLSPEC int SDLCALL SDL_mutexV(SDL_mutex *mutex)
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{
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if ( mutex == NULL )
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{
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SDL_SetError("Passed a NULL mutex");
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return -1;
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}
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if ( DosReleaseMutexSem(mutex->hmtxID) != NO_ERROR )
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{
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SDL_SetError("Couldn't release mutex");
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return -1;
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}
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return(0);
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}
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