SDL

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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2024 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 *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 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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// Lock the mutex
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void SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
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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.Wait();
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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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SDL_bool SDL_TryLockMutex(SDL_Mutex *mutex)
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{
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    if (mutex) {
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        // Not yet implemented.
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        return true;
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    }
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    return true;
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}
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#endif
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// Unlock the mutex
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void SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS // clang doesn't know about NULL mutexes
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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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    }
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}
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