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libs/Common/EventQueue.h

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+////////////////////////////////////////////////////////////////////
+// EventQueue.h
+//
+// Copyright 2007 cDc@seacave
+// Distributed under the Boost Software License, Version 1.0
+// (See http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef __SEACAVE_EVENTQUEUE_H__
+#define __SEACAVE_EVENTQUEUE_H__
+
+
+// I N C L U D E S /////////////////////////////////////////////////
+
+#include "Types.h"
+#include "CriticalSection.h"
+#include "Semaphore.h"
+
+
+// D E F I N E S ///////////////////////////////////////////////////
+
+
+namespace SEACAVE {
+
+// S T R U C T S ///////////////////////////////////////////////////
+
+class Event
+{
+public:
+	Event(uint32_t _id) : id(_id) {}
+	virtual ~Event() {}
+
+	uint32_t GetID() const { return id; }
+
+	virtual bool Run(void* /*pArgs*/ = NULL) { return true; }
+
+protected:
+	const uint32_t id;
+};
+typedef cQueue<Event*,Event*,0> EVENTQUEUE;
+
+
+/**************************************************************************************
+ * Events Queue
+ * --------------
+ * basic eventing mechanism
+ * multi-thread safe
+ **************************************************************************************/
+
+class GENERAL_API EventQueue  
+{
+public:
+	EventQueue() {}
+	~EventQueue() {}
+
+	void Clear(); // reset the state of the locks and empty the queue
+
+	void AddEvent(Event*); //add a new event to the end of the queue
+	void AddEventFirst(Event*); //add a new event to the beginning of the queue
+	Event* GetEvent(); //block until an event arrives and get the first event pending in the queue
+	Event* GetEvent(uint32_t millis); //block until an event arrives or time expires and get the first event pending in the queue
+	Event* GetEventLast(); //block until an event arrives and get the last event pending in the queue
+	Event* GetEventLast(uint32_t millis); //block until an event arrives or time expires and get the last event pending in the queue
+
+	bool IsEmpty() const; //are there any events in the queue?
+	uint_t GetSize() const; //number of events in the queue
+
+protected:
+	Semaphore m_sem;
+	mutable CriticalSection m_cs;
+	EVENTQUEUE m_events;
+};
+/*----------------------------------------------------------------*/
+
+
+// basic event and thread pool
+class GENERAL_API EventThreadPool : public ThreadPool, public EventQueue
+{
+public:
+	inline EventThreadPool() {}
+	inline EventThreadPool(size_type nThreads) : ThreadPool(nThreads) {}
+	inline EventThreadPool(size_type nThreads, Thread::FncStart pfnStarter, void* pData=NULL) : ThreadPool(nThreads, pfnStarter, pData) {}
+	inline ~EventThreadPool() {}
+
+	void stop(); //stop threads, reset locks state and empty event queue
+};
+/*----------------------------------------------------------------*/
+
+} // namespace SEACAVE
+
+#endif // __SEACAVE_EVENTQUEUE_H__