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/**
* @file thread_pool.h
*
* @brief Interface of thread_pool_t.
*
*/
/*
* Copyright (C) 2005-2006 Martin Willi
* Copyright (C) 2005 Jan Hutter
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#ifndef THREAD_POOL_H_
#define THREAD_POOL_H_
typedef struct thread_pool_t thread_pool_t;
#include <stdlib.h>
#include <library.h>
/**
* @brief A thread_pool consists of a pool of threads processing jobs from the job queue.
*
* Current implementation uses as many threads as specified in constructor.
* A more improved version would dynamically increase thread count if necessary.
*
* @b Constructors:
* - thread_pool_create()
*
* @todo Add support for dynamic thread handling
*
* @ingroup processing
*/
struct thread_pool_t {
/**
* @brief Return currently instanciated thread count.
*
* @param thread_pool calling object
* @return size of thread pool
*/
u_int (*get_pool_size) (thread_pool_t *thread_pool);
/**
* @brief Get the number of threads currently waiting for work.
*
* @param thread_pool calling object
* @return number of idle threads
*/
u_int (*get_idle_threads) (thread_pool_t *thread_pool);
/**
* @brief Destroy a thread_pool_t object.
*
* Sends cancellation request to all threads and AWAITS their termination.
*
* @param thread_pool calling object
*/
void (*destroy) (thread_pool_t *thread_pool);
};
/**
* @brief Create the thread pool using using pool_size of threads.
*
* @param pool_size desired pool size
* @return
* - thread_pool_t object if one ore more threads could be started, or
* - NULL if no threads could be created
*
* @ingroup processing
*/
thread_pool_t *thread_pool_create(size_t pool_size);
#endif /*THREAD_POOL_H_*/
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