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/*
* ThreadManager.cpp
*
* Copyright (C) 2009 Matthias Schiffer <matthias@gamezock.de>
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "ThreadManager.h"
#include "FdManager.h"
#include <fcntl.h>
#include <sigc++/bind.h>
#include <sigc++/hide.h>
#include <ignore-value.h>
namespace Mad {
namespace Net {
ThreadManager ThreadManager::threadManager;
void ThreadManager::workerFunc() {
while(true) {
gl_lock_lock(runLock);
if(!running || !isThisWorkerThread()) {
gl_lock_unlock(runLock);
return;
}
gl_lock_unlock(runLock);
gl_lock_lock(workLock);
while(work.empty()) {
gl_cond_wait(workCond, workLock);
if(!running) {
gl_lock_unlock(workLock);
return;
}
}
sigc::slot<void> nextWork = work.front();
work.pop();
gl_lock_unlock(workLock);
nextWork();
}
// And let the new worker thread join us...
pushWork(sigc::bind(sigc::mem_fun(this, &ThreadManager::threadFinished), (gl_thread_t)gl_thread_self()));
}
void ThreadManager::detach() {
if(!isThisMainThread()) {
Common::Logger::log(Common::Logger::CRITICAL, "Tried to detach main thread! This is just WRONG!");
return;
}
gl_lock_lock(runLock);
bool isRunning = running;
gl_lock_unlock(runLock);
if(!isRunning) // There's no point in creating a new worker thread when we aren't running anymore
return;
gl_lock_lock(threadLock);
if(workerThread == (gl_thread_t)gl_thread_self()) {// Already detached?
threads.insert(workerThread);
workerThread = gl_thread_create(&ThreadManager::workerStart, 0);
}
gl_lock_unlock(threadLock);
}
void ThreadManager::pushWork(const sigc::slot<void> &newWork) {
gl_lock_lock(workLock);
work.push(newWork);
gl_cond_signal(workCond);
gl_lock_unlock(workLock);
}
void ThreadManager::pushIO(const sigc::slot<void> &newIO) {
gl_lock_lock(ioLock);
ioQueue.push(newIO);
if(!hasIO) {
hasIO = true;
ignore_value(write(ioNotifyPipe[1], "", 1));
}
gl_lock_unlock(ioLock);
}
void ThreadManager::runIO() {
gl_lock_lock(ioLock);
// Empty the pipe
char buf;
ignore_value(read(ioNotifyPipe[0], &buf, 1));
hasIO = false;
while(!ioQueue.empty()) {
sigc::slot<void> handler = ioQueue.front();
ioQueue.pop();
gl_lock_unlock(ioLock);
handler();
gl_lock_lock(ioLock);
}
gl_lock_unlock(ioLock);
}
void ThreadManager::doInit() {
gl_lock_init(threadLock);
gl_lock_init(runLock);
gl_lock_init(workLock);
gl_cond_init(workCond);
gl_lock_init(ioLock);
hasIO = false;
// TODO Error handling
pipe(ioNotifyPipe);
fcntl(ioNotifyPipe[0], F_SETFL, fcntl(ioNotifyPipe[0], F_GETFL) | O_NONBLOCK);
fcntl(ioNotifyPipe[1], F_SETFL, fcntl(ioNotifyPipe[1], F_GETFL) | O_NONBLOCK);
Net::FdManager::get()->registerFd(ioNotifyPipe[0], sigc::hide(sigc::mem_fun(this, &ThreadManager::runIO)), POLLIN);
running = true;
gl_lock_lock(threadLock);
mainThread = (gl_thread_t)gl_thread_self();
workerThread = gl_thread_create(&ThreadManager::workerStart, 0);
loggerThread = gl_thread_create(&ThreadManager::loggerStart, 0);
gl_lock_unlock(threadLock);
}
void ThreadManager::doDeinit() {
if(!isThisMainThread()) {
// TODO Critical error!!!
return;
}
// First set running = false so the worker threads quit
gl_lock_lock(runLock);
gl_lock_lock(workLock);
running = false;
gl_cond_signal(workCond);
gl_lock_unlock(workLock);
gl_lock_unlock(runLock);
// We don't have to lock threadLock as detach() won't change workerThread when running is false
gl_thread_join(workerThread, 0);
// Now wait for all detached threads
gl_lock_lock(threadLock);
while(!threads.empty()) {
gl_thread_t thread = *threads.begin();
gl_lock_unlock(threadLock);
gl_thread_join(thread, 0);
gl_lock_lock(threadLock);
threads.erase(thread);
}
gl_lock_unlock(threadLock);
// Finally, the logger thread has to die
Common::LogManager::get()->stopLoggerThread();
gl_thread_join(loggerThread, 0);
// And then we clean everything up
Net::FdManager::get()->unregisterFd(ioNotifyPipe[0]);
close(ioNotifyPipe[0]);
close(ioNotifyPipe[1]);
gl_lock_destroy(ioLock);
gl_cond_destroy(workCond);
gl_lock_destroy(workLock);
gl_lock_destroy(runLock);
gl_lock_destroy(threadLock);
}
}
}
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