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/*:*
*: File: ./src/thrd/pool.cpp
*:
*: yChat; Homepage: www.yChat.org; Version 0.8.3-CURRENT
*:
*: Copyright (C) 2003 Paul C. Buetow, Volker Richter
*: Copyright (C) 2004 Paul C. Buetow
*: Copyright (C) 2005 EXA Digital Solutions GbR
*:
*: 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.
*:
*: 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.
*:
*: You should have received a copy of the GNU General Public License
*: along with this program; if not, write to the Free Software
*: Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*:*/
#ifndef POOL_CPP
#define POOL_CPP
#include "pool.h"
using namespace std;
int pool::i_num_avail_threads;
int pool::i_num_total_threads;
int pool::i_max_queue_size;
int pool::i_cur_queue_index;
int pool::i_free_queue_index;
task** pool::queue_tasks;
pthread_mutex_t pool::mut_threads;
pthread_mutex_t pool::mut_queue_tasks;
pthread_mutex_t pool::mut_num_avail_threads;
pthread_cond_t pool::cond_new_task;
void
pool::init()
{
pthread_mutex_init(&mut_threads, 0);
pthread_mutex_init(&mut_queue_tasks, 0);
pthread_mutex_init(&mut_num_avail_threads, 0);
pthread_cond_init(&cond_new_task, 0);
i_num_total_threads = i_cur_queue_index = i_free_queue_index = 0;
i_num_avail_threads = tool::string2int( wrap::CONF->get_elem( "httpd.thread.initpoolsize" ) );
i_max_queue_size = tool::string2int( wrap::CONF->get_elem( "httpd.thread.maxqueuesize" ) );
queue_tasks = new task*[i_max_queue_size];
for (int i = 0; i < i_max_queue_size; ++i)
queue_tasks[i] = NULL;
increase_pool(i_num_avail_threads);
}
void
pool::destroy()
{
pthread_mutex_lock(&mut_queue_tasks);
delete [] queue_tasks;
pthread_mutex_unlock(&mut_queue_tasks);
pthread_mutex_destroy(&mut_threads);
pthread_mutex_destroy(&mut_queue_tasks);
pthread_mutex_destroy(&mut_num_avail_threads);
pthread_cond_destroy(&cond_new_task);
}
int
pool::increase_pool(int i_num)
{
wrap::system_message(POOLFLL + tool::int2string(i_num) +","+tool::int2string(i_num_total_threads)+")");
int i_max_pool_size = tool::string2int( wrap::CONF->get_elem( "httpd.thread.maxpoolsize" ) );
for ( int i = 0; i < i_num; ++i )
{
if ( i_max_pool_size != 0 && i_num_total_threads >= i_max_pool_size )
{
wrap::system_message(POOLER2+tool::int2string(i_max_pool_size)+")");
wrap::system_message(POOLER1+tool::int2string(i)+")");
return i;
}
++i_num_total_threads;
pthread_t p_pthread;
pthread_create(&p_pthread, 0, wait_for_task, (void*) p_pthread );
}
return i_num;
}
void*
pool::wait_for_task( void* p_void )
{
for (;;)
{
pthread_mutex_lock(&mut_threads);
pthread_cond_wait(&cond_new_task, &mut_threads);
pthread_mutex_lock(&mut_num_avail_threads);
if ( --i_num_avail_threads < 5 )
{
int i_size = 9 - i_num_avail_threads;
i_size = increase_pool(i_size);
i_num_avail_threads += i_size;
}
pthread_mutex_unlock(&mut_num_avail_threads);
pthread_mutex_lock(&mut_queue_tasks);
task* p_task = queue_tasks[i_cur_queue_index];
queue_tasks[i_cur_queue_index++] = NULL;
i_cur_queue_index %= i_max_queue_size;
pthread_mutex_unlock(&mut_queue_tasks);
pthread_mutex_unlock(&mut_threads);
(*(p_task->p_func))(p_task->p_void);
delete p_task;
pthread_mutex_lock(&mut_num_avail_threads);
i_num_avail_threads++;
pthread_mutex_unlock(&mut_num_avail_threads);
}
return 0;
}
void
pool::run(void* p_void)
{
pthread_mutex_lock(&mut_queue_tasks);
queue_tasks[i_free_queue_index++] = new task(run_func, p_void);
i_free_queue_index %= i_max_queue_size;
pthread_mutex_unlock(&mut_queue_tasks);
pthread_cond_signal(&cond_new_task);
}
void
pool::run_func(void *p_void)
{
_socket* p_sock = static_cast<_socket*>(p_void);
wrap::SOCK->read_write(p_sock);
}
bool
pool::allow_user_login()
{
pthread_mutex_lock(&mut_num_avail_threads);
if ( i_num_avail_threads < 2 )
{
int i_max_pool_size = tool::string2int( wrap::CONF->get_elem( "httpd.thread.maxpoolsize" ) );
if ( i_max_pool_size != 0 && i_max_pool_size == i_num_total_threads )
{
pthread_mutex_unlock(&mut_num_avail_threads);
return false;
}
}
pthread_mutex_unlock(&mut_num_avail_threads);
return true;
}
#endif
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