6875e1c262
- SDL_CreateMutex returns NULL when the creation fails (ngage) - SDL_SemValue returns 0 when the semaphore is NULL (n3ds)
117 lines
2.6 KiB
C++
117 lines
2.6 KiB
C++
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2022 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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/* An implementation of mutexes using the Symbian API. */
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#include <e32std.h>
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#include "SDL_systhread_c.h"
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struct SDL_mutex
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{
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TInt handle;
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};
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extern TInt CreateUnique(TInt (*aFunc)(const TDesC& aName, TAny*, TAny*), TAny*, TAny*);
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static TInt NewMutex(const TDesC& aName, TAny* aPtr1, TAny*)
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{
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return ((RMutex *)aPtr1)->CreateGlobal(aName);
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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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RMutex rmutex;
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TInt status = CreateUnique(NewMutex, &rmutex, NULL);
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if (status != KErrNone) {
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SDL_SetError("Couldn't create mutex.");
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return NULL;
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}
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SDL_mutex* mutex = new /*(ELeave)*/ SDL_mutex;
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mutex->handle = rmutex.Handle();
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return mutex;
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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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if (mutex) {
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RMutex rmutex;
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rmutex.SetHandle(mutex->handle);
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rmutex.Signal();
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rmutex.Close();
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delete(mutex);
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mutex = NULL;
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}
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}
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/* Try to lock the mutex */
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#if 0
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int
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SDL_TryLockMutex(SDL_mutex * mutex)
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{
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if (mutex == NULL)
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{
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return SDL_InvalidParamError("mutex");
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}
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// Not yet implemented.
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return 0;
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}
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#endif
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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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if (mutex == NULL) {
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return SDL_InvalidParamError("mutex");
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}
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RMutex rmutex;
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rmutex.SetHandle(mutex->handle);
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rmutex.Wait();
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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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if (mutex == NULL) {
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return SDL_InvalidParamError("mutex");
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}
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RMutex rmutex;
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rmutex.SetHandle(mutex->handle);
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rmutex.Signal();
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return 0;
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}
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/* vi: set ts=4 sw=4 expandtab: */
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