mirror of https://github.com/encounter/SDL.git
196 lines
4.0 KiB
C++
196 lines
4.0 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 semaphores using the Symbian API. */
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#include <e32std.h>
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#include "SDL_error.h"
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#include "SDL_thread.h"
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#define SDL_MUTEX_TIMEOUT -2
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struct SDL_semaphore
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{
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TInt handle;
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TInt count;
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};
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struct TInfo
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{
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TInfo(TInt aTime, TInt aHandle) :
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iTime(aTime), iHandle(aHandle), iVal(0) {}
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TInt iTime;
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TInt iHandle;
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TInt iVal;
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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 TBool RunThread(TAny* aInfo)
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{
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TInfo* info = STATIC_CAST(TInfo*, aInfo);
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User::After(info->iTime);
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RSemaphore sema;
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sema.SetHandle(info->iHandle);
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sema.Signal();
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info->iVal = SDL_MUTEX_TIMEOUT;
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return 0;
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}
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static TInt
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NewThread(const TDesC& aName, TAny* aPtr1, TAny* aPtr2)
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{
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return ((RThread*)(aPtr1))->Create
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(aName,
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RunThread,
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KDefaultStackSize,
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NULL,
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aPtr2);
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}
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static TInt NewSema(const TDesC& aName, TAny* aPtr1, TAny* aPtr2)
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{
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TInt value = *((TInt*) aPtr2);
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return ((RSemaphore*)aPtr1)->CreateGlobal(aName, value);
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}
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static void WaitAll(SDL_sem *sem)
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{
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RSemaphore sema;
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sema.SetHandle(sem->handle);
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sema.Wait();
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while(sem->count < 0)
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{
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sema.Wait();
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}
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}
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SDL_sem *
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SDL_CreateSemaphore(Uint32 initial_value)
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{
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RSemaphore s;
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TInt status = CreateUnique(NewSema, &s, &initial_value);
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if(status != KErrNone)
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{
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SDL_SetError("Couldn't create semaphore");
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}
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SDL_semaphore* sem = new /*(ELeave)*/ SDL_semaphore;
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sem->handle = s.Handle();
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sem->count = initial_value;
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return(sem);
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}
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void
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SDL_DestroySemaphore(SDL_sem * sem)
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{
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if (sem)
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{
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RSemaphore sema;
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sema.SetHandle(sem->handle);
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sema.Signal(sema.Count());
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sema.Close();
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delete sem;
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sem = NULL;
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}
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}
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int
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SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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{
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if (! sem)
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{
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SDL_SetError("Passed a NULL sem");
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return -1;
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}
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if (timeout == SDL_MUTEX_MAXWAIT)
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{
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WaitAll(sem);
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return SDL_MUTEX_MAXWAIT;
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}
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RThread thread;
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TInfo* info = new (ELeave)TInfo(timeout, sem->handle);
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TInt status = CreateUnique(NewThread, &thread, info);
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if(status != KErrNone)
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{
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return status;
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}
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thread.Resume();
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WaitAll(sem);
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if(thread.ExitType() == EExitPending)
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{
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thread.Kill(SDL_MUTEX_TIMEOUT);
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}
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thread.Close();
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return info->iVal;
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}
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int
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SDL_SemTryWait(SDL_sem *sem)
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{
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if(sem->count > 0)
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{
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sem->count--;
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}
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return SDL_MUTEX_TIMEOUT;
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}
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int
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SDL_SemWait(SDL_sem * sem)
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{
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return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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}
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Uint32
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SDL_SemValue(SDL_sem * sem)
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{
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if (! sem)
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{
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SDL_SetError("Passed a NULL sem.");
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return 0;
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}
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return sem->count;
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}
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int
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SDL_SemPost(SDL_sem * sem)
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{
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if (! sem)
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{
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SDL_SetError("Passed a NULL sem.");
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return -1;
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}
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sem->count++;
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RSemaphore sema;
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sema.SetHandle(sem->handle);
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sema.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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