tpool.h.svn-base

sigmadesign smp8623 gui source code ,bingo

/* -------------------------------------------------------------------------
 * tpool.h - thread pool defs
 * Copyright (C) 2008 Dimitar Atanasov <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * -------------------------------------------------------------------------
 */

#ifndef _TPOOL_H_
#define _TPOOL_H_

#include  <stdio.h>
#include  <pthread.h>
#include <mysql++/mysql++.h>
/*
 * a generic thread pool creation routines
 */

#define POOL_WORKER_THREADS 250
#define POOL_QUEUE_SIZE		3000
#define POOL_BLOCK_ONFULL	0
#define POOL_THREADS_FINISH 1

typedef struct tpool_work{
  void (*handler_routine)(void*);
  void *arg;
  struct tpool_work *next;
} tpool_work_t;

class tpool_t {
	int num_threads;
  	int max_queue_size;

  	int do_not_block_when_full;
  	pthread_t *threads;
  	int cur_queue_size;
  	tpool_work_t *queue_head;
  	tpool_work_t *queue_tail;
  	pthread_mutex_t queue_lock;
  	pthread_cond_t queue_not_full;
  	pthread_cond_t queue_not_empty;
  	pthread_cond_t queue_empty;
  	pthread_cond_t all_work_done;
  	int queue_closed;
  	int shutdown;
  	int threads_awake;

public:
	tpool_t(int, int);
	~tpool_t();

	int tpool_add_work(void  (*routine)(void*), void *arg);

	friend void *tpool_thread(void *tpool);
};

class DBPool : public mysqlpp::ConnectionPool {
public:
	DBPool() {

	}

	~DBPool(){
		clear();
	}
protected:
	virtual mysqlpp::Connection* create();

	/// \brief Destroy a connection
	///
	/// Subclasses must override this.
	///
	/// This is for destroying the objects returned by create().
	/// Because we can't know what the derived class did to create the
	/// connection we can't reliably know how to destroy it.
	virtual void destroy(mysqlpp::Connection* con);

	/// \brief Returns the maximum number of seconds a connection is
	/// able to remain idle before it is dropped.
	///
	/// Subclasses must override this as it encodes a policy issue,
	/// something that MySQL++ can't declare by fiat.
	///
	/// \retval number of seconds before an idle connection is destroyed
	/// due to lack of use
	virtual unsigned int max_idle_time()
	{
		return 3600;
	}
};
#endif /* _TPOOL_H_ */