Engine directory for ticket #1

Engine/source/platformMac/macCarbThread.cpp

@@ -0,0 +1,159 @@
+//-----------------------------------------------------------------------------
+// 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 <pthread.h>
+#include "platform/threads/thread.h"
+#include "platform/threads/semaphore.h"
+#include "platform/threads/mutex.h"
+#include <stdlib.h>
+
+class PlatformThreadData
+{
+public:
+   ThreadRunFunction       mRunFunc;
+   void*                   mRunArg;
+   Thread*                 mThread;
+   Semaphore               mGateway; // default count is 1
+   U32                     mThreadID;
+   bool                    mDead;
+};
+
+ThreadManager::MainThreadId ThreadManager::smMainThreadId;
+
+//-----------------------------------------------------------------------------
+// Function:    ThreadRunHandler
+// Summary:     Calls Thread::run() with the thread's specified run argument.
+//               Neccesary because Thread::run() is provided as a non-threaded
+//               way to execute the thread's run function. So we have to keep
+//               track of the thread's lock here.
+static void *ThreadRunHandler(void * arg)
+{
+   PlatformThreadData *mData = reinterpret_cast<PlatformThreadData*>(arg);
+   Thread *thread = mData->mThread;
+
+   // mThreadID is filled in twice, once here and once in pthread_create().
+   // We fill in mThreadID here as well as in pthread_create() because addThread()
+   // can execute before pthread_create() returns and sets mThreadID.
+   // The value from pthread_create() and pthread_self() are guaranteed to be equivalent (but not identical)
+   mData->mThreadID = ThreadManager::getCurrentThreadId();
+   
+   ThreadManager::addThread(thread);
+   thread->run(mData->mRunArg);
+   ThreadManager::removeThread(thread);
+
+   bool autoDelete = thread->autoDelete;
+   
+   mData->mThreadID = 0;
+   mData->mDead = true;
+   mData->mGateway.release();
+   
+   if( autoDelete )
+      delete thread;
+      
+   // return value for pthread lib's benefit
+   return NULL;
+   // the end of this function is where the created pthread will die.
+}
+
+//-----------------------------------------------------------------------------
+Thread::Thread(ThreadRunFunction func, void* arg, bool start_thread, bool autodelete)
+{
+   AssertFatal( !start_thread, "Thread::Thread() - auto-starting threads from ctor has been disallowed since the run() method is virtual" );
+
+   mData = new PlatformThreadData;
+   mData->mRunFunc = func;
+   mData->mRunArg = arg;
+   mData->mThread = this;
+   mData->mThreadID = 0;
+   mData->mDead = false;
+   autoDelete = autodelete;
+}
+
+Thread::~Thread()
+{
+   stop();
+   if( isAlive() )
+      join();
+
+   delete mData;
+}
+
+void Thread::start( void* arg )
+{
+   // cause start to block out other pthreads from using this Thread, 
+   // at least until ThreadRunHandler exits.
+   mData->mGateway.acquire();
+
+   // reset the shouldStop flag, so we'll know when someone asks us to stop.
+   shouldStop = false;
+   
+   mData->mDead = false;
+   
+   if( !mData->mRunArg )
+      mData->mRunArg = arg;
+
+   pthread_create((pthread_t*)(&mData->mThreadID), NULL, ThreadRunHandler, mData);
+}
+
+bool Thread::join()
+{
+   // not using pthread_join here because pthread_join cannot deal
+   // with multiple simultaneous calls.
+   
+   mData->mGateway.acquire();
+   AssertFatal( !isAlive(), "Thread::join() - thread not dead after join()" );
+   mData->mGateway.release();
+   
+   return true;
+}
+
+void Thread::run(void* arg)
+{
+   if(mData->mRunFunc)
+      mData->mRunFunc(arg);
+}
+
+bool Thread::isAlive()
+{
+   return ( !mData->mDead );
+}
+
+U32 Thread::getId()
+{
+   return mData->mThreadID;
+}
+
+void Thread::_setName( const char* )
+{
+   // Not supported.  Wading through endless lists of Thread-1, Thread-2, Thread-3, ... trying to find
+   // that one thread you are looking for is just so much fun.
+}
+
+U32 ThreadManager::getCurrentThreadId()
+{
+   return (U32)pthread_self();
+}
+
+bool ThreadManager::compare(U32 threadId_1, U32 threadId_2)
+{
+   return pthread_equal((_opaque_pthread_t*)threadId_1, (_opaque_pthread_t*)threadId_2);
+}