diff options
Diffstat (limited to 'distrib/sdl-1.2.12/src/thread/os2/SDL_syssem.c')
| -rw-r--r-- | distrib/sdl-1.2.12/src/thread/os2/SDL_syssem.c | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/distrib/sdl-1.2.12/src/thread/os2/SDL_syssem.c b/distrib/sdl-1.2.12/src/thread/os2/SDL_syssem.c deleted file mode 100644 index d445934..0000000 --- a/distrib/sdl-1.2.12/src/thread/os2/SDL_syssem.c +++ /dev/null @@ -1,192 +0,0 @@ -/* - SDL - Simple DirectMedia Layer - Copyright (C) 1997-2006 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" - -/* Semaphore functions using the OS/2 API */ - -#define INCL_DOS -#define INCL_DOSERRORS -#define INCL_DOSSEMAPHORES -#include <os2.h> - -#include "SDL_thread.h" -#include "SDL_timer.h" - - -struct SDL_semaphore { - HMTX id; - HEV changed; - Uint32 value; -}; - - -/* Create a semaphore */ -DECLSPEC SDL_sem * SDLCALL SDL_CreateSemaphore(Uint32 initial_value) -{ - SDL_sem *sem; - ULONG ulrc; - - /* Allocate sem memory */ - sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); - if ( sem ) { - /* Create the mutex semaphore */ - ulrc = DosCreateMutexSem(NULL,&(sem->id),0,TRUE); - if ( ulrc ) { - SDL_SetError("Couldn't create semaphore"); - SDL_free(sem); - sem = NULL; - } else - { - DosCreateEventSem(NULL, &(sem->changed), 0, FALSE); - sem->value = initial_value; - DosReleaseMutexSem(sem->id); - } - } else { - SDL_OutOfMemory(); - } - return(sem); -} - -/* Free the semaphore */ -DECLSPEC void SDLCALL SDL_DestroySemaphore(SDL_sem *sem) -{ - if ( sem ) { - if ( sem->id ) { - DosCloseEventSem(sem->changed); - DosCloseMutexSem(sem->id); - sem->id = 0; - } - SDL_free(sem); - } -} - -DECLSPEC int SDLCALL SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) -{ - ULONG ulrc; - - if ( ! sem ) { - SDL_SetError("Passed a NULL sem"); - return -1; - } - - if ( timeout == SDL_MUTEX_MAXWAIT ) { - while (1) { - ulrc = DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT); - if (ulrc) { - /* if error waiting mutex */ - SDL_SetError("DosRequestMutexSem() failed"); - return -1; - } else if (sem->value) { - sem->value--; - DosReleaseMutexSem(sem->id); - return 0; - } else { - ULONG ulPostCount; - DosResetEventSem(sem->changed, &ulPostCount); - DosReleaseMutexSem(sem->id); - /* continue waiting until somebody posts the semaphore */ - DosWaitEventSem(sem->changed, SEM_INDEFINITE_WAIT); - } - } - } else - if ( timeout == 0 ) - { - ulrc = DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT); - if (ulrc==NO_ERROR) - { - if (sem->value) - { - sem->value--; - DosReleaseMutexSem(sem->id); - return 0; - } else - { - DosReleaseMutexSem(sem->id); - return SDL_MUTEX_TIMEDOUT; - } - } else - { - SDL_SetError("DosRequestMutexSem() failed"); - return -1; - } - } else { - ulrc = DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT); - if (ulrc) { - /* if error waiting mutex */ - SDL_SetError("DosRequestMutexSem() failed"); - return -1; - } else - if (sem->value) { - sem->value--; - DosReleaseMutexSem(sem->id); - return 0; - } else { - ULONG ulPostCount; - DosResetEventSem(sem->changed, &ulPostCount); - DosReleaseMutexSem(sem->id); - /* continue waiting until somebody posts the semaphore */ - ulrc = DosWaitEventSem(sem->changed, timeout); - if (ulrc==NO_ERROR) - return 0; - else - return SDL_MUTEX_TIMEDOUT; - } - } - /* never reached */ - return -1; -} - -DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem *sem) -{ - return SDL_SemWaitTimeout(sem, 0); -} - -DECLSPEC int SDLCALL SDL_SemWait(SDL_sem *sem) -{ - return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); -} - -/* Returns the current count of the semaphore */ -DECLSPEC Uint32 SDLCALL SDL_SemValue(SDL_sem *sem) -{ - if ( ! sem ) { - SDL_SetError("Passed a NULL sem"); - return 0; - } - return sem->value; -} - -DECLSPEC int SDLCALL SDL_SemPost(SDL_sem *sem) -{ - if ( ! sem ) { - SDL_SetError("Passed a NULL sem"); - return -1; - } - if ( DosRequestMutexSem(sem->id,SEM_INDEFINITE_WAIT) ) { - SDL_SetError("DosRequestMutexSem() failed"); - return -1; - } - sem->value++; - DosPostEventSem(sem->changed); - DosReleaseMutexSem(sem->id); - return 0; -} |