/*
 *
 * (C) 2003-2020 Anope Team
 * Contact us at team@anope.org
 *
 * Please read COPYING and README for further details.
 *
 * Based on the original code of Epona by Lara.
 * Based on the original code of Services by Andy Church.
 */

#ifndef THREADENGINE_H
#define THREADENGINE_H

#include "sockets.h"
#include "extensible.h"

class CoreExport Thread : public Pipe, public Extensible
{
 private:
	/* Set to true to tell the thread to finish and we are waiting for it */
	bool exit;

 public:
	/* Handle for this thread */
	pthread_t handle;

	/** Threads constructor
	 */
	Thread();

	/** Threads destructor
	 */
	virtual ~Thread();

	/** Join to the thread, sets the exit state to true
	 */
	void Join();

	/** Sets the exit state as true informing the thread we want it to shut down
	 */
	void SetExitState();

	/** Exit the thread. Note that the thread still must be joined to free resources!
	 */
	void Exit();

	/** Launch the thread
	 */
	void Start();

	/** Returns the exit state of the thread
	 * @return true if we want to exit
	 */
	bool GetExitState() const;

	/** Called when this thread should be joined to
	 */
	void OnNotify();

	/** Called when the thread is run.
	 */
	virtual void Run() = 0;
};

class CoreExport Mutex
{
 protected:
	/* A mutex, used to keep threads in sync */
	pthread_mutex_t mutex;

 public:
	/** Constructor
	 */
	Mutex();

	/** Destructor
	 */
	~Mutex();

	/** Attempt to lock the mutex, will hang until a lock can be achieved
	 */
	void Lock();

	/** Unlock the mutex, it must be locked first
	 */
	void Unlock();

	/** Attempt to lock the mutex, will return true on success and false on fail
	 * Does not block
	 * @return true or false
	 */
	bool TryLock();
};

class CoreExport Condition : public Mutex
{
 private:
	/* A condition */
	pthread_cond_t cond;

 public:
	/** Constructor
	 */
	Condition();

	/** Destructor
	 */
	~Condition();

	/** Called to wakeup the waiter
	 */
	void Wakeup();

	/** Called to wait for a Wakeup() call
	 */
	void Wait();
};

#endif // THREADENGINE_H
