SDL & Win32 platform threads cleanup.

Engine/source/platformWin32/threads/semaphore.cpp

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+//-----------------------------------------------------------------------------
+// Copyright (c) 2012 GarageGames, LLC
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//-----------------------------------------------------------------------------
+
+#include "platformWin32/platformWin32.h"
+#include "platform/threads/semaphore.h"
+
+class PlatformSemaphore
+{
+public:
+   HANDLE   *semaphore;
+
+   PlatformSemaphore(S32 initialCount)
+   {
+      semaphore = new HANDLE;
+      *semaphore = CreateSemaphore(0, initialCount, S32_MAX, 0);
+   }
+
+   ~PlatformSemaphore()
+   {
+      CloseHandle(*(HANDLE*)(semaphore));
+      delete semaphore;
+      semaphore = NULL;
+   }
+};
+
+Semaphore::Semaphore(S32 initialCount)
+{
+   mData = new PlatformSemaphore(initialCount);
+}
+
+Semaphore::~Semaphore()
+{
+   AssertFatal(mData && mData->semaphore, "Semaphore::destroySemaphore: invalid semaphore");
+   delete mData;
+}
+
+bool Semaphore::acquire(bool block, S32 timeoutMS)
+{
+   AssertFatal(mData && mData->semaphore, "Semaphore::acquireSemaphore: invalid semaphore");
+   if(block)
+   {
+      WaitForSingleObject(*(HANDLE*)(mData->semaphore), timeoutMS != -1 ? timeoutMS : INFINITE );
+      return(true);
+   }
+   else
+   {
+      DWORD result = WaitForSingleObject(*(HANDLE*)(mData->semaphore), 0);
+      return(result == WAIT_OBJECT_0);
+   }
+}
+
+void Semaphore::release()
+{
+   AssertFatal(mData && mData->semaphore, "Semaphore::releaseSemaphore: invalid semaphore");
+   ReleaseSemaphore(*(HANDLE*)(mData->semaphore), 1, 0);
+}