/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#if SDL_THREAD_OS2
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/* An implementation of mutexes for OS/2 */
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#include "SDL_thread.h"
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#include "SDL_systhread_c.h"
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#include "../../core/os2/SDL_os2.h"
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#define INCL_DOSSEMAPHORES
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#define INCL_DOSERRORS
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#include <os2.h>
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struct SDL_mutex {
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HMTX _handle;
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};
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/* Create a mutex */
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SDL_mutex *
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SDL_CreateMutex(void)
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{
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ULONG ulRC;
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HMTX hMtx;
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ulRC = DosCreateMutexSem(NULL, &hMtx, 0, FALSE);
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if (ulRC != NO_ERROR) {
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debug_os2("DosCreateMutexSem(), rc = %u", ulRC);
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return NULL;
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}
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return (SDL_mutex *)hMtx;
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}
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/* Free the mutex */
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void
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SDL_DestroyMutex(SDL_mutex * mutex)
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{
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ULONG ulRC;
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HMTX hMtx = (HMTX)mutex;
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ulRC = DosCloseMutexSem(hMtx);
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if (ulRC != NO_ERROR) {
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debug_os2("DosCloseMutexSem(), rc = %u", ulRC);
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}
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}
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/* Lock the mutex */
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int
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SDL_LockMutex(SDL_mutex * mutex)
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{
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ULONG ulRC;
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HMTX hMtx = (HMTX)mutex;
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if (hMtx == NULLHANDLE)
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return SDL_SetError("Passed a NULL mutex");
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ulRC = DosRequestMutexSem(hMtx, SEM_INDEFINITE_WAIT);
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if (ulRC != NO_ERROR) {
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debug_os2("DosRequestMutexSem(), rc = %u", ulRC);
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return -1;
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}
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return 0;
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}
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/* try Lock the mutex */
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int
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SDL_TryLockMutex(SDL_mutex * mutex)
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{
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ULONG ulRC;
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HMTX hMtx = (HMTX)mutex;
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if (hMtx == NULLHANDLE)
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return SDL_SetError("Passed a NULL mutex");
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ulRC = DosRequestMutexSem(hMtx, SEM_IMMEDIATE_RETURN);
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if (ulRC == ERROR_TIMEOUT)
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return SDL_MUTEX_TIMEDOUT;
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if (ulRC != NO_ERROR) {
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debug_os2("DosRequestMutexSem(), rc = %u", ulRC);
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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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int
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SDL_UnlockMutex(SDL_mutex * mutex)
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{
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ULONG ulRC;
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HMTX hMtx = (HMTX)mutex;
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if (hMtx == NULLHANDLE)
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return SDL_SetError("Passed a NULL mutex");
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ulRC = DosReleaseMutexSem(hMtx);
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if (ulRC != NO_ERROR)
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return SDL_SetError("DosReleaseMutexSem(), rc = %u", ulRC);
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return 0;
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}
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#endif /* SDL_THREAD_OS2 */
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/* vi: set ts=4 sw=4 expandtab: */
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