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/**
* @file thread_pool.c
*
* @brief Thread pool with some threads processing the job_queue.
*
*/
/*
* Copyright (C) 2005 Jan Hutter, Martin Willi
* 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 "globals.h"
#include "queues/job_queue.h"
#include "utils/allocator.h"
#include "utils/logger.h"
/**
* @brief structure with private members for thread_pool_t
*/
typedef struct private_thread_pool_s private_thread_pool_t;
struct private_thread_pool_s {
/**
* inclusion of public members
*/
thread_pool_t public;
/**
* @brief Processing function of a worker thread
*
* @param this private_thread_pool_t-Object
*/
void (*function) (private_thread_pool_t *this);
/**
* number of running threads
*/
size_t pool_size;
/**
* array of thread ids
*/
pthread_t *threads;
/**
* logger of the threadpool
*/
logger_t *logger;
} ;
/**
* implements private_thread_pool_t.function
*/
static void job_processing(private_thread_pool_t *this)
{
/* cancellation disabled by default */
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
this->logger->log(this->logger, CONTROL_MORE, "thread %u started working", pthread_self());
for (;;) {
job_t *job;
global_job_queue->get(global_job_queue, &job);
this->logger->log(this->logger, CONTROL_MORE, "thread %u got a job", pthread_self());
/* process them here */
job->destroy(job);
}
}
/**
* implementation of thread_pool_t.get_pool_size
*/
static size_t get_pool_size(private_thread_pool_t *this)
{
return this->pool_size;
}
/**
* Implementation of thread_pool_t.destroy
*/
static status_t destroy(private_thread_pool_t *this)
{
int current;
/* flag thread for termination */
for (current = 0; current < this->pool_size; current++) {
this->logger->log(this->logger, CONTROL, "cancelling thread %u", this->threads[current]);
pthread_cancel(this->threads[current]);
}
/* wait for all threads */
for (current = 0; current < this->pool_size; current++) {
pthread_join(this->threads[current], NULL);
this->logger->log(this->logger, CONTROL, "thread %u terminated", this->threads[current]);
}
/* free mem */
global_logger_manager->destroy_logger(global_logger_manager, this->logger);
allocator_free(this->threads);
allocator_free(this);
return SUCCESS;
}
#include <stdio.h>
/*
* see header
*/
thread_pool_t *thread_pool_create(size_t pool_size)
{
int current;
private_thread_pool_t *this = allocator_alloc_thing(private_thread_pool_t);
/* fill in public fields */
this->public.destroy = (status_t(*)(thread_pool_t*))destroy;
this->public.get_pool_size = (size_t(*)(thread_pool_t*))get_pool_size;
this->function = job_processing;
this->pool_size = pool_size;
this->threads = allocator_alloc(sizeof(pthread_t) * pool_size);
if (this->threads == NULL)
{
allocator_free(this);
return NULL;
}
this->logger = global_logger_manager->create_logger(global_logger_manager,THREAD_POOL,NULL);
if (this->threads == NULL)
{
allocator_free(this);
allocator_free(this->threads);
return NULL;
}
/* try to create as many threads as possible, up tu pool_size */
for (current = 0; current < pool_size; current++)
{
if (pthread_create(&(this->threads[current]), NULL, (void*(*)(void*))this->function, this) == 0)
{
this->logger->log(this->logger, CONTROL, "thread %u created", this->threads[current]);
}
else
{
/* creation failed, is it the first one? */
if (current == 0)
{
this->logger->log(this->logger, CONTROL, "could not create any thread: %s\n", strerror(errno));
allocator_free(this->threads);
allocator_free(this->logger);
allocator_free(this);
return NULL;
}
/* not all threads could be created, but at least one :-/ */
this->logger->log(this->logger, CONTROL, "could only create %d from requested %d threads: %s\n", current, pool_size, strerror(errno));
this->pool_size = current;
return (thread_pool_t*)this;
}
}
return (thread_pool_t*)this;
}
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