added support for starting functors/lambdas to Poco::Thread class

Foundation/include/Poco/Thread.h

@@ -122,7 +122,7 @@ public:
 		/// May return 0 if the priority has not been explicitly set.
 		
 	static int getMinOSPriority(int policy = POLICY_DEFAULT);
-		/// Returns the mininum operating system-specific priority value,
+		/// Returns the minimum operating system-specific priority value,
 		/// which can be passed to setOSPriority() for the given policy.
 		
 	static int getMaxOSPriority(int policy = POLICY_DEFAULT);
@@ -149,6 +149,13 @@ public:
 	void start(Callable target, void* pData = 0);
 		/// Starts the thread with the given target and parameter.
 
+	template <class Functor>
+	void startFunc(Functor fn)
+		/// Starts the thread with the given functor object or lambda.
+	{
+		startImpl(new FunctorRunnable<Functor>(fn));
+	}
+
 	void join();
 		/// Waits until the thread completes execution.	
 		/// If multiple threads try to join the same
@@ -222,6 +229,28 @@ protected:
 	static int uniqueId();
 		/// Creates and returns a unique id for a thread.
 
+	template <class Functor>
+	class FunctorRunnable: public Runnable
+	{
+	public:
+		FunctorRunnable(const Functor& functor):
+			_functor(functor)
+		{
+		}
+
+		~FunctorRunnable()
+		{
+		}
+
+		void run()
+		{
+			_functor();
+		}
+	
+	private:
+		Functor _functor;
+	};
+
 private:
 	Thread(const Thread&);
 	Thread& operator = (const Thread&);

Foundation/include/Poco/Thread_POSIX.h

@@ -26,6 +26,7 @@
 #include "Poco/Event.h"
 #include "Poco/RefCountedObject.h"
 #include "Poco/AutoPtr.h"
+#include "Poco/SharedPtr.h"
 #include <pthread.h>
 // must be limits.h (not <climits>) for PTHREAD_STACK_MIN on Solaris
 #include <limits.h>
@@ -61,16 +62,6 @@ public:
 		POLICY_DEFAULT_IMPL = SCHED_OTHER
 	};
 	
-	struct CallbackData: public RefCountedObject
-	{
-		CallbackData(): callback(0), pData(0)
-		{
-		}
-
-		Callable  callback;
-		void*     pData; 
-	};
-
 	ThreadImpl();
 	~ThreadImpl();
 
@@ -83,9 +74,7 @@ public:
 	static int getMaxOSPriorityImpl(int policy);
 	void setStackSizeImpl(int size);
 	int getStackSizeImpl() const;
-	void startImpl(Runnable& target);
-	void startImpl(Callable target, void* pData = 0);
-
+	void startImpl(SharedPtr<Runnable> pTarget);
 	void joinImpl();
 	bool joinImpl(long milliseconds);
 	bool isRunningImpl() const;
@@ -129,8 +118,6 @@ private:
 	struct ThreadData: public RefCountedObject
 	{
 		ThreadData():
-			pRunnableTarget(0),
-			pCallbackTarget(0),
 			thread(0),
 			prio(PRIO_NORMAL_IMPL),
 			policy(SCHED_OTHER),
@@ -146,8 +133,7 @@ private:
 		#endif
 		}
 
-		Runnable*     pRunnableTarget;
-		AutoPtr<CallbackData> pCallbackTarget;
+		SharedPtr<Runnable> pRunnableTarget;
 		pthread_t     thread;
 		int           prio;
 		int           osPrio;

Foundation/include/Poco/Thread_WIN32.h

@@ -22,6 +22,7 @@
 
 #include "Poco/Foundation.h"
 #include "Poco/Runnable.h"
+#include "Poco/SharedPtr.h"
 #include "Poco/UnWindows.h"
 
 
@@ -40,16 +41,6 @@ public:
 	typedef unsigned (__stdcall *Entry)(void*);
 #endif
 
-	struct CallbackData
-	{
-		CallbackData(): callback(0), pData(0)
-		{
-		}
-
-		Callable  callback;
-		void*     pData; 
-	};
-
 	enum Priority
 	{
 		PRIO_LOWEST_IMPL  = THREAD_PRIORITY_LOWEST,
@@ -76,9 +67,7 @@ public:
 	static int getMaxOSPriorityImpl(int policy);
 	void setStackSizeImpl(int size);
 	int getStackSizeImpl() const;
-	void startImpl(Runnable& target);
-	void startImpl(Callable target, void* pData = 0);
-
+	void startImpl(SharedPtr<Runnable> pTarget);
 	void joinImpl();
 	bool joinImpl(long milliseconds);
 	bool isRunningImpl() const;
@@ -94,12 +83,6 @@ protected:
 	static unsigned __stdcall runnableEntry(void* pThread);
 #endif
 
-#if defined(_DLL)
-	static DWORD WINAPI callableEntry(LPVOID pThread);
-#else
-	static unsigned __stdcall callableEntry(void* pThread);
-#endif
-
 	void createImpl(Entry ent, void* pData);
 	void threadCleanup();
 
@@ -129,8 +112,7 @@ private:
 		DWORD _slot;
 	};
 
-	Runnable*    _pRunnableTarget;
-	CallbackData _callbackTarget;
+	SharedPtr<Runnable> _pRunnableTarget;
 	HANDLE _thread;
 	DWORD _threadId;
 	int _prio;

Foundation/src/Thread.cpp

@@ -38,6 +38,57 @@
 namespace Poco {
 
 
+namespace {
+
+class RunnableHolder: public Runnable
+{
+public:
+	RunnableHolder(Runnable& target):
+		_target(target)
+	{
+	}
+
+	~RunnableHolder()
+	{
+	}
+
+	void run()
+	{
+		_target.run();
+	}
+
+private:
+	Runnable& _target;
+};
+
+
+class CallableHolder: public Runnable
+{
+public:
+	CallableHolder(Thread::Callable callable, void* pData):
+		_callable(callable),
+		_pData(pData)
+	{
+	}
+
+	~CallableHolder()
+	{
+	}
+
+	void run()
+	{
+		_callable(_pData);
+	}
+
+private:
+	Thread::Callable _callable;
+	void* _pData;
+};
+
+
+} // namespace
+
+
 Thread::Thread(): 
 	_id(uniqueId()), 
 	_name(makeName()), 
@@ -76,13 +127,13 @@ Thread::Priority Thread::getPriority() const
 
 void Thread::start(Runnable& target)
 {
-	startImpl(target);
+	startImpl(new RunnableHolder(target));
 }
 
 
 void Thread::start(Callable target, void* pData)
 {
-	startImpl(target, pData);
+	startImpl(new CallableHolder(target, pData));
 }
 
 

Foundation/src/Thread_POSIX.cpp

@@ -104,7 +104,10 @@ void ThreadImpl::setPriorityImpl(int prio)
 		_pData->policy = SCHED_OTHER;
 		if (isRunningImpl())
 		{
-			struct sched_param par;
+			struct sched_param par; struct MyStruct
+			{
+
+			};
 			par.sched_priority = mapPrio(_pData->prio, SCHED_OTHER);
 			if (pthread_setschedparam(_pData->thread, SCHED_OTHER, &par))
 				throw SystemException("cannot set thread priority");
@@ -177,7 +180,7 @@ void ThreadImpl::setStackSizeImpl(int size)
 }
 
 
-void ThreadImpl::startImpl(Runnable& target)
+void ThreadImpl::startImpl(SharedPtr<Runnable> pTarget)
 {
 	if (_pData->pRunnableTarget)
 		throw SystemException("thread already running");
@@ -194,7 +197,7 @@ void ThreadImpl::startImpl(Runnable& target)
 		}
 	}
 
-	_pData->pRunnableTarget = &target;
+	_pData->pRunnableTarget = pTarget;
 	if (pthread_create(&_pData->thread, &attributes, runnableEntry, this))
 	{
 		_pData->pRunnableTarget = 0;
@@ -224,56 +227,6 @@ void ThreadImpl::startImpl(Runnable& target)
 }
 
 
-void ThreadImpl::startImpl(Callable target, void* pData)
-{
-	if (_pData->pCallbackTarget && _pData->pCallbackTarget->callback)
-		throw SystemException("thread already running");
-
-	pthread_attr_t attributes;
-	pthread_attr_init(&attributes);
-
-	if (_pData->stackSize != 0)
-	{
-		if (0 != pthread_attr_setstacksize(&attributes, _pData->stackSize))
-			throw SystemException("can not set thread stack size");
-	}
-
-	if (0 == _pData->pCallbackTarget.get())
-		_pData->pCallbackTarget = new CallbackData;
-
-	_pData->pCallbackTarget->callback = target;
-	_pData->pCallbackTarget->pData = pData;
-
-	if (pthread_create(&_pData->thread, &attributes, callableEntry, this))
-	{
-		_pData->pCallbackTarget->callback = 0;
-		_pData->pCallbackTarget->pData = 0;
-		pthread_attr_destroy(&attributes);
-		throw SystemException("cannot start thread");
-	}
-	_pData->started = true;
-	pthread_attr_destroy(&attributes);
-	
-	if (_pData->policy == SCHED_OTHER)
-	{
-		if (_pData->prio != PRIO_NORMAL_IMPL)
-		{
-			struct sched_param par;
-			par.sched_priority = mapPrio(_pData->prio, SCHED_OTHER);
-			if (pthread_setschedparam(_pData->thread, SCHED_OTHER, &par))
-				throw SystemException("cannot set thread priority");
-		}
-	}
-	else
-	{
-		struct sched_param par;
-		par.sched_priority = _pData->osPrio;
-		if (pthread_setschedparam(_pData->thread, _pData->policy, &par))
-			throw SystemException("cannot set thread priority");
-	}
-}
-
-
 void ThreadImpl::joinImpl()
 {
 	if (!_pData->started) return;

Foundation/src/Thread_WIN32.cpp

@@ -70,7 +70,6 @@ ThreadImpl::CurrentThreadHolder ThreadImpl::_currentThreadHolder;
 
 
 ThreadImpl::ThreadImpl():
-	_pRunnableTarget(0),
 	_thread(0),
 	_threadId(0),
 	_prio(PRIO_NORMAL_IMPL),
@@ -105,30 +104,16 @@ void ThreadImpl::setOSPriorityImpl(int prio, int /* policy */)
 }
 
 
-void ThreadImpl::startImpl(Runnable& target)
+void ThreadImpl::startImpl(SharedPtr<Runnable> pTarget)
 {
 	if (isRunningImpl())
 		throw SystemException("thread already running");
 
-	_pRunnableTarget = &target;
-
+	_pRunnableTarget = pTarget;
 	createImpl(runnableEntry, this);
 }
 
 
-void ThreadImpl::startImpl(Callable target, void* pData)
-{
-	if (isRunningImpl())
-		throw SystemException("thread already running");
-
-	threadCleanup();
-	_callbackTarget.callback = target;
-	_callbackTarget.pData = pData;
-
-	createImpl(callableEntry, this);
-}
-
-
 void ThreadImpl::createImpl(Entry ent, void* pData)
 {
 #if defined(_DLL)
@@ -237,35 +222,4 @@ unsigned __stdcall ThreadImpl::runnableEntry(void* pThread)
 }
 
 
-#if defined(_DLL)
-DWORD WINAPI ThreadImpl::callableEntry(LPVOID pThread)
-#else
-unsigned __stdcall ThreadImpl::callableEntry(void* pThread)
-#endif
-{
-	_currentThreadHolder.set(reinterpret_cast<ThreadImpl*>(pThread));
-#if defined(POCO_WIN32_DEBUGGER_THREAD_NAMES)
-	setThreadName(-1, reinterpret_cast<Thread*>(pThread)->getName().c_str());
-#endif
-	try
-	{
-		ThreadImpl* pTI = reinterpret_cast<ThreadImpl*>(pThread);
-		pTI->_callbackTarget.callback(pTI->_callbackTarget.pData);
-	}
-	catch (Exception& exc)
-	{
-		ErrorHandler::handle(exc);
-	}
-	catch (std::exception& exc)
-	{
-		ErrorHandler::handle(exc);
-	}
-	catch (...)
-	{
-		ErrorHandler::handle();
-	}
-	return 0;
-}
-
-
 } // namespace Poco

Foundation/testsuite/src/ThreadTest.cpp

@@ -363,6 +363,44 @@ void ThreadTest::testThreadFunction()
 }
 
 
+void ThreadTest::testThreadFunctor()
+{
+	struct Functor
+	{
+		void operator () ()
+		{
+			++MyRunnable::_staticVar;
+		}
+	};
+
+	Thread thread;
+
+	assert (!thread.isRunning());
+
+	MyRunnable::_staticVar = 0;
+	thread.startFunc(Functor());
+	thread.join();
+	assert (1 == MyRunnable::_staticVar);
+
+	assert (!thread.isRunning());
+
+#if __cplusplus >= 201103L
+
+	Thread thread2;
+
+	assert (!thread2.isRunning());
+
+	MyRunnable::_staticVar = 0;
+	thread.startFunc([] () {MyRunnable::_staticVar++;});
+	thread.join();
+	assert (1 == MyRunnable::_staticVar);
+
+	assert (!thread2.isRunning());
+
+#endif
+}
+
+
 void ThreadTest::testThreadStackSize()
 {
 	int stackSize = 50000000;
@@ -436,6 +474,7 @@ CppUnit::Test* ThreadTest::suite()
 	CppUnit_addTest(pSuite, ThreadTest, testTrySleep);
 	CppUnit_addTest(pSuite, ThreadTest, testThreadTarget);
 	CppUnit_addTest(pSuite, ThreadTest, testThreadFunction);
+	CppUnit_addTest(pSuite, ThreadTest, testThreadFunctor);
 	CppUnit_addTest(pSuite, ThreadTest, testThreadStackSize);
 	CppUnit_addTest(pSuite, ThreadTest, testSleep);
 

Foundation/testsuite/src/ThreadTest.h

@@ -37,6 +37,7 @@ public:
 	void testTrySleep();
 	void testThreadTarget();
 	void testThreadFunction();
+	void testThreadFunctor();
 	void testThreadStackSize();
 	void testSleep();