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/**
* @file thread_pool.c
*
* @brief Implementation 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.
*/
#include <stdlib.h>
#include <pthread.h>
#include <string.h>
#include <errno.h>
#include "thread_pool.h"
#include <daemon.h>
#include <queues/job_queue.h>
typedef struct private_thread_pool_t private_thread_pool_t;
/**
* @brief Private data of thread_pool_t class.
*/
struct private_thread_pool_t {
/**
* Public thread_pool_t interface.
*/
thread_pool_t public;
/**
* Number of running threads.
*/
u_int pool_size;
/**
* Number of threads waiting for work
*/
u_int idle_threads;
/**
* Array of thread ids.
*/
pthread_t *threads;
} ;
/**
* Implementation of private_thread_pool_t.process_jobs.
*/
static void process_jobs(private_thread_pool_t *this)
{
job_t *job;
status_t status;
/* cancellation disabled by default */
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
DBG1(DBG_JOB, "worker thread running, thread_ID: %06u",
(int)pthread_self());
while (TRUE)
{
/* TODO: should be atomic, but is not mission critical */
this->idle_threads++;
job = charon->job_queue->get(charon->job_queue);
this->idle_threads--;
status = job->execute(job);
if (status == DESTROY_ME)
{
job->destroy(job);
}
}
}
/**
* Implementation of thread_pool_t.get_pool_size.
*/
static u_int get_pool_size(private_thread_pool_t *this)
{
return this->pool_size;
}
/**
* Implementation of thread_pool_t.get_idle_threads.
*/
static u_int get_idle_threads(private_thread_pool_t *this)
{
return this->idle_threads;
}
/**
* Implementation of thread_pool_t.destroy.
*/
static void destroy(private_thread_pool_t *this)
{
int current;
/* flag thread for termination */
for (current = 0; current < this->pool_size; current++)
{
DBG1(DBG_JOB, "cancelling worker thread #%d", current+1);
pthread_cancel(this->threads[current]);
}
/* wait for all threads */
for (current = 0; current < this->pool_size; current++) {
if (pthread_join(this->threads[current], NULL) == 0)
{
DBG1(DBG_JOB, "worker thread #%d terminated", current+1);
}
else
{
DBG1(DBG_JOB, "could not terminate worker thread #%d", current+1);
}
}
/* free mem */
free(this->threads);
free(this);
}
/*
* Described in header.
*/
thread_pool_t *thread_pool_create(size_t pool_size)
{
int current;
private_thread_pool_t *this = malloc_thing(private_thread_pool_t);
/* fill in public fields */
this->public.destroy = (void(*)(thread_pool_t*))destroy;
this->public.get_pool_size = (u_int(*)(thread_pool_t*))get_pool_size;
this->public.get_idle_threads = (u_int(*)(thread_pool_t*))get_idle_threads;
/* initialize member */
this->pool_size = pool_size;
this->idle_threads = 0;
this->threads = malloc(sizeof(pthread_t) * pool_size);
/* try to create as many threads as possible, up to pool_size */
for (current = 0; current < pool_size; current++)
{
if (pthread_create(&(this->threads[current]), NULL,
(void*(*)(void*))process_jobs, this) == 0)
{
DBG1(DBG_JOB, "created worker thread #%d", current+1);
}
else
{
/* creation failed, is it the first one? */
if (current == 0)
{
free(this->threads);
free(this);
charon->kill(charon, "could not create any worker threads");
}
/* not all threads could be created, but at least one :-/ */
DBG1(DBG_JOB, "could only create %d from requested %d threads!",
current, pool_size);
this->pool_size = current;
break;
}
}
return (thread_pool_t*)this;
}
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