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170 lines
3.8 KiB
170 lines
3.8 KiB
/*
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* Copyright (C) 2002-2003 Fhg Fokus
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*
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* This file is part of SEMS, a free SIP media server.
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*
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* SEMS is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version. This program is released under
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* the GPL with the additional exemption that compiling, linking,
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* and/or using OpenSSL is allowed.
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*
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* For a license to use the SEMS software under conditions
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* other than those described here, or to purchase support for this
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* software, please contact iptel.org by e-mail at the following addresses:
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* info@iptel.org
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*
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* SEMS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "AmThread.h"
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#include "log.h"
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#include <unistd.h>
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#include "errno.h"
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#include <string>
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using std::string;
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#include <system_error>
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#include <exception>
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void AmThread::_start()
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{
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_pid = static_cast<unsigned long>(_td.native_handle());
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DBG("Thread %lu is starting.\n", _pid);
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run();
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DBG("Thread %lu is ending.\n", _pid);
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_state = state::stopped;
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}
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void AmThread::start()
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{
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state expected = state::idle;
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if(!_state.compare_exchange_strong(expected, state::running)) {
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DBG("Thread %lu already running.\n", _pid);
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return;
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}
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_pid = 0;
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_td = std::thread(&AmThread::_start, this);
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}
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void AmThread::stop()
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{
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state expected = state::running;
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if(!_state.compare_exchange_strong(expected, state::stopping)){
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DBG("Thread %lu already stopped\n", _pid);
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return;
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}
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// gives the thread a chance to clean up
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DBG("Thread %lu calling on_stop\n", _pid);
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on_stop();
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}
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void AmThread::join()
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{
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// only when neither stopped nor joined
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if (_td.joinable())
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_td.join();
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}
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AmThreadWatcher* AmThreadWatcher::_instance=0;
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AmMutex AmThreadWatcher::_inst_mut;
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AmThreadWatcher::AmThreadWatcher()
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: _run_cond(false)
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{
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}
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AmThreadWatcher* AmThreadWatcher::instance()
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{
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_inst_mut.lock();
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if(!_instance){
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_instance = new AmThreadWatcher();
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_instance->start();
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}
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_inst_mut.unlock();
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return _instance;
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}
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void AmThreadWatcher::add(AmThread* t)
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{
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DBG("trying to add thread %lu to thread watcher.\n", t->_pid);
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q_mut.lock();
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thread_queue.push(t);
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_run_cond.set(true);
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q_mut.unlock();
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DBG("added thread %lu to thread watcher.\n", t->_pid);
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}
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void AmThreadWatcher::on_stop()
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{
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}
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void AmThreadWatcher::run()
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{
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for(;;){
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_run_cond.wait_for();
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// Let some time for to threads
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// to stop by themselves
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sleep(10);
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q_mut.lock();
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DBG("Thread watcher starting its work\n");
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try {
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std::queue<AmThread*> n_thread_queue;
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while(!thread_queue.empty()){
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AmThread* cur_thread = thread_queue.front();
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thread_queue.pop();
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q_mut.unlock();
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DBG("thread %lu is to be processed in thread watcher.\n", cur_thread->_pid);
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if(cur_thread->is_stopped()){
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DBG("thread %lu has been destroyed.\n", cur_thread->_pid);
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cur_thread->join();
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delete cur_thread;
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}
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else {
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DBG("thread %lu still running.\n", cur_thread->_pid);
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n_thread_queue.push(cur_thread);
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}
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q_mut.lock();
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}
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swap(thread_queue,n_thread_queue);
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}catch(...){
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/* this one is IMHO very important, as lock is called in try block! */
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ERROR("unexpected exception, state may be invalid!\n");
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}
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bool more = !thread_queue.empty();
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q_mut.unlock();
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DBG("Thread watcher finished\n");
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if(!more)
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_run_cond.set(false);
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}
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}
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