182 lines
4.5 KiB
C
182 lines
4.5 KiB
C
/**
|
|
* @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 "allocator.h"
|
|
#include "logger.h"
|
|
#include "queues/job_queue.h"
|
|
#include "globals.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;
|
|
}
|