185 lines
4.2 KiB
C
185 lines
4.2 KiB
C
/**
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* @file thread_pool.c
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*
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* @brief Implementation of thread_pool_t.
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*
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*/
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/*
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* Copyright (C) 2005-2006 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <stdlib.h>
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#include <pthread.h>
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#include <string.h>
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#include <errno.h>
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#include "thread_pool.h"
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#include <daemon.h>
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#include <processing/job_queue.h>
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typedef struct private_thread_pool_t private_thread_pool_t;
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/**
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* @brief Private data of thread_pool_t class.
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*/
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struct private_thread_pool_t {
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/**
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* Public thread_pool_t interface.
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*/
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thread_pool_t public;
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/**
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* Number of running threads.
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*/
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u_int pool_size;
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/**
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* Number of threads waiting for work
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*/
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u_int idle_threads;
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/**
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* Array of thread ids.
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*/
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pthread_t *threads;
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};
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/**
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* Implementation of private_thread_pool_t.process_jobs.
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*/
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static void process_jobs(private_thread_pool_t *this)
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{
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job_t *job;
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status_t status;
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/* cancellation disabled by default */
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pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
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DBG1(DBG_JOB, "worker thread running, thread_ID: %06u",
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(int)pthread_self());
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/* drop threads capabilities, except CAP_NET_ADMIN */
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charon->drop_capabilities(charon, TRUE, TRUE, FALSE);
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while (TRUE)
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{
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/* TODO: should be atomic, but is not mission critical */
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this->idle_threads++;
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job = charon->job_queue->get(charon->job_queue);
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this->idle_threads--;
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status = job->execute(job);
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if (status == DESTROY_ME)
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{
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job->destroy(job);
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}
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}
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}
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/**
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* Implementation of thread_pool_t.get_pool_size.
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*/
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static u_int get_pool_size(private_thread_pool_t *this)
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{
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return this->pool_size;
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}
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/**
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* Implementation of thread_pool_t.get_idle_threads.
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*/
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static u_int get_idle_threads(private_thread_pool_t *this)
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{
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return this->idle_threads;
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}
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/**
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* Implementation of thread_pool_t.destroy.
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*/
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static void destroy(private_thread_pool_t *this)
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{
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int current;
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/* flag thread for termination */
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for (current = 0; current < this->pool_size; current++)
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{
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DBG1(DBG_JOB, "cancelling worker thread #%d", current+1);
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pthread_cancel(this->threads[current]);
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}
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/* wait for all threads */
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for (current = 0; current < this->pool_size; current++) {
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if (pthread_join(this->threads[current], NULL) == 0)
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{
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DBG1(DBG_JOB, "worker thread #%d terminated", current+1);
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}
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else
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{
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DBG1(DBG_JOB, "could not terminate worker thread #%d", current+1);
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}
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}
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/* free mem */
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free(this->threads);
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free(this);
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}
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/*
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* Described in header.
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*/
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thread_pool_t *thread_pool_create(size_t pool_size)
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{
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int current;
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private_thread_pool_t *this = malloc_thing(private_thread_pool_t);
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/* fill in public fields */
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this->public.destroy = (void(*)(thread_pool_t*))destroy;
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this->public.get_pool_size = (u_int(*)(thread_pool_t*))get_pool_size;
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this->public.get_idle_threads = (u_int(*)(thread_pool_t*))get_idle_threads;
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/* initialize member */
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this->pool_size = pool_size;
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this->idle_threads = 0;
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this->threads = malloc(sizeof(pthread_t) * pool_size);
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/* try to create as many threads as possible, up to pool_size */
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for (current = 0; current < pool_size; current++)
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{
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if (pthread_create(&(this->threads[current]), NULL,
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(void*(*)(void*))process_jobs, this) == 0)
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{
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DBG1(DBG_JOB, "created worker thread #%d", current+1);
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}
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else
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{
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/* creation failed, is it the first one? */
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if (current == 0)
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{
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free(this->threads);
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free(this);
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charon->kill(charon, "could not create any worker threads");
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}
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/* not all threads could be created, but at least one :-/ */
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DBG1(DBG_JOB, "could only create %d from requested %d threads!",
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current, pool_size);
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this->pool_size = current;
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break;
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}
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}
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return (thread_pool_t*)this;
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}
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