kc3-lang/SDL/src/thread/ngage/SDL_syssem.cpp

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• Hash : 9b75fa01
  Author :
  Date : 2022-05-11T18:31:34
  

  N-Gage port: add changes from code reviews, overall cleanup (#5618) * Add changes from code review by @ccawley2011, #5597, overall cleanup * Update N-Gage README, minor cleanup and rephrasing * Call SDL_SetMainReady() before calling SDL_main, return SDL_main instead of main

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• src/thread/ngage/SDL_syssem.cpp

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "../../SDL_internal.h"
  
  /* An implementation of semaphores using the Symbian API. */
  
  #include <e32std.h>
  
  #include "SDL_error.h"
  #include "SDL_thread.h"
  
  #define SDL_MUTEX_TIMEOUT -2
  
  struct SDL_semaphore
  {
      TInt handle;
      TInt count;
  };
  
  struct TInfo
  {
      TInfo(TInt aTime, TInt aHandle) :
          iTime(aTime), iHandle(aHandle), iVal(0) {}
      TInt iTime;
      TInt iHandle;
      TInt iVal;
  };
  
  extern TInt CreateUnique(TInt (*aFunc)(const TDesC& aName, TAny*, TAny*), TAny*, TAny*);
  
  static TBool RunThread(TAny* aInfo)
  {
      TInfo* info = STATIC_CAST(TInfo*, aInfo);
      User::After(info->iTime);
      RSemaphore sema;
      sema.SetHandle(info->iHandle);
      sema.Signal();
      info->iVal = SDL_MUTEX_TIMEOUT;
      return 0;
  }
  
  static TInt
  NewThread(const TDesC& aName, TAny* aPtr1, TAny* aPtr2)
  {
      return ((RThread*)(aPtr1))->Create
          (aName,
           RunThread,
           KDefaultStackSize,
           NULL,
           aPtr2);
  }
  
  static TInt NewSema(const TDesC& aName, TAny* aPtr1, TAny* aPtr2)
  {
      TInt value = *((TInt*) aPtr2);
      return ((RSemaphore*)aPtr1)->CreateGlobal(aName, value);
  }
  
  static void WaitAll(SDL_sem *sem)
  {
      RSemaphore sema;
      sema.SetHandle(sem->handle);
      sema.Wait();
      while(sem->count < 0)
      {
          sema.Wait();
      }
  }
  
  SDL_sem *
  SDL_CreateSemaphore(Uint32 initial_value)
  {
      RSemaphore s;
      TInt status = CreateUnique(NewSema, &s, &initial_value);
      if(status != KErrNone)
      {
          SDL_SetError("Couldn't create semaphore");
      }
      SDL_semaphore* sem = new /*(ELeave)*/ SDL_semaphore;
      sem->handle = s.Handle();
      sem->count = initial_value;
      return(sem);
  }
  
  void
  SDL_DestroySemaphore(SDL_sem * sem)
  {
      if (sem)
      {
          RSemaphore sema;
          sema.SetHandle(sem->handle);
          sema.Signal(sema.Count());
          sema.Close();
          delete sem;
          sem = NULL;
      }
  }
  
  int
  SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
  {
      if (! sem)
      {
          SDL_SetError("Passed a NULL sem");
          return -1;
      }
  
      if (timeout == SDL_MUTEX_MAXWAIT)
      {
          WaitAll(sem);
          return SDL_MUTEX_MAXWAIT;
      }
  
      RThread thread;
      TInfo*  info   = new (ELeave)TInfo(timeout, sem->handle);
      TInt    status = CreateUnique(NewThread, &thread, info);
  
      if(status != KErrNone)
      {
          return status;
      }
  
      thread.Resume();
      WaitAll(sem);
  
      if(thread.ExitType() == EExitPending)
      {
          thread.Kill(SDL_MUTEX_TIMEOUT);
      }
  
      thread.Close();
      return info->iVal;
  }
  
  int
  SDL_SemTryWait(SDL_sem *sem)
  {
      if(sem->count > 0)
      {
          sem->count--;
      }
      return SDL_MUTEX_TIMEOUT;
  }
  
  int
  SDL_SemWait(SDL_sem * sem)
  {
      return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
  }
  
  Uint32
  SDL_SemValue(SDL_sem * sem)
  {
      if (! sem)
      {
          SDL_SetError("Passed a NULL sem.");
          return 0;
      }
      return sem->count;
  }
  
  int
  SDL_SemPost(SDL_sem * sem)
  {
      if (! sem)
      {
          SDL_SetError("Passed a NULL sem.");
          return -1;
      }
      sem->count++;
      RSemaphore sema;
      sema.SetHandle(sem->handle);
      sema.Signal();
      return 0;
  }
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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