| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "../../SDL_internal.h" |
| |
| #if SDL_THREAD_OS2 |
| |
| /* An implementation of mutexes for OS/2 */ |
| |
| #include "SDL_thread.h" |
| #include "SDL_systhread_c.h" |
| #include "../../core/os2/SDL_os2.h" |
| |
| #define INCL_DOSSEMAPHORES |
| #define INCL_DOSERRORS |
| #include <os2.h> |
| |
| struct SDL_mutex |
| { |
| ULONG ulHandle; |
| }; |
| |
| /* Create a mutex */ |
| SDL_mutex * |
| SDL_CreateMutex(void) |
| { |
| ULONG ulRC; |
| HMTX hMtx; |
| |
| ulRC = DosCreateMutexSem( NULL, &hMtx, 0, FALSE ); |
| if ( ulRC != NO_ERROR ) |
| { |
| debug( "DosCreateMutexSem(), rc = %u", ulRC ); |
| return NULL; |
| } |
| |
| return (SDL_mutex *)hMtx; |
| } |
| |
| /* Free the mutex */ |
| void |
| SDL_DestroyMutex(SDL_mutex * mutex) |
| { |
| ULONG ulRC; |
| HMTX hMtx = (HMTX)mutex; |
| |
| ulRC = DosCloseMutexSem( hMtx ); |
| if ( ulRC != NO_ERROR ) |
| debug( "DosCloseMutexSem(), rc = %u", ulRC ); |
| } |
| |
| /* Lock the mutex */ |
| int |
| SDL_LockMutex(SDL_mutex * mutex) |
| { |
| ULONG ulRC; |
| HMTX hMtx = (HMTX)mutex; |
| |
| if ( hMtx == NULLHANDLE ) |
| return SDL_SetError( "Passed a NULL mutex" ); |
| |
| ulRC = DosRequestMutexSem( hMtx, SEM_INDEFINITE_WAIT ); |
| if ( ulRC != NO_ERROR ) |
| { |
| debug( "DosRequestMutexSem(), rc = %u", ulRC ); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| /* try Lock the mutex */ |
| int |
| SDL_TryLockMutex(SDL_mutex * mutex) |
| { |
| ULONG ulRC; |
| HMTX hMtx = (HMTX)mutex; |
| |
| if ( hMtx == NULLHANDLE ) |
| return SDL_SetError( "Passed a NULL mutex" ); |
| |
| ulRC = DosRequestMutexSem( hMtx, SEM_IMMEDIATE_RETURN ); |
| |
| if ( ulRC == ERROR_TIMEOUT ) |
| return SDL_MUTEX_TIMEDOUT; |
| |
| if ( ulRC != NO_ERROR ) |
| { |
| debug( "DosRequestMutexSem(), rc = %u", ulRC ); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| /* Unlock the mutex */ |
| int |
| SDL_UnlockMutex(SDL_mutex * mutex) |
| { |
| ULONG ulRC; |
| HMTX hMtx = (HMTX)mutex; |
| |
| if ( hMtx == NULLHANDLE ) |
| return SDL_SetError( "Passed a NULL mutex" ); |
| |
| ulRC = DosReleaseMutexSem( hMtx ); |
| if ( ulRC != NO_ERROR ) |
| return SDL_SetError( "DosReleaseMutexSem(), rc = %u", ulRC ); |
| |
| return 0; |
| } |
| |
| #endif /* SDL_THREAD_OS2 */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |