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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2013-2015 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012 Robby <robby@chatbelgie.be>
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2008 Craig Edwards <brain@inspircd.org>
*
* This file is part of InspIRCd. InspIRCd 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, version 2.
*
* 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 "inspircd.h"
#include "threadsocket.h"
bool Thread::Start()
{
try
{
if (thread)
return false;
thread = new std::thread(Thread::StartInternal, this);
return true;
}
catch (const std::system_error& err)
{
throw CoreException("Unable to start new thread: " + std::string(err.what()));
}
}
void Thread::StartInternal(Thread* thread)
{
#ifndef _WIN32
// C++ does not have an API for this so we still need to use pthreads.
sigset_t set;
sigemptyset(&set);
sigaddset(&set, SIGPIPE);
pthread_sigmask(SIG_BLOCK, &set, nullptr);
#endif
thread->OnStart();
}
bool Thread::Stop()
{
if (!thread)
return false;
OnStop();
stopping = true;
thread->join();
stdalgo::delete_zero(thread);
return true;
}
#if __has_include(<sys/eventfd.h>)
#include <sys/eventfd.h>
class ThreadSignalSocket final
: public EventHandler
{
private:
SocketThread* parent = nullptr;
public:
ThreadSignalSocket(SocketThread* p, int newfd)
: parent(p)
{
SetFd(newfd);
SocketEngine::AddFd(this, FD_WANT_FAST_READ | FD_WANT_NO_WRITE);
}
~ThreadSignalSocket() override
{
SocketEngine::Close(this);
}
void Notify()
{
eventfd_write(GetFd(), 1);
}
void OnEventHandlerRead() override
{
eventfd_t dummy;
eventfd_read(GetFd(), &dummy);
parent->OnNotify();
}
void OnEventHandlerWrite() override
{
ServerInstance->GlobalCulls.AddItem(this);
}
void OnEventHandlerError(int errcode) override
{
ThreadSignalSocket::OnEventHandlerWrite();
}
};
SocketThread::SocketThread()
{
int fd = eventfd(0, EFD_NONBLOCK);
if (fd < 0)
throw CoreException("Could not create pipe " + std::string(strerror(errno)));
socket = new ThreadSignalSocket(this, fd);
}
#else
# ifdef _WIN32
# define pipe(fd) _pipe(fd, 1, 0)
# else
# include <unistd.h>
# endif
class ThreadSignalSocket final
: public EventHandler
{
private:
SocketThread* parent;
int send_fd;
public:
ThreadSignalSocket(SocketThread* p, int recvfd, int sendfd)
: parent(p)
, send_fd(sendfd)
{
SetFd(recvfd);
SocketEngine::NonBlocking(GetFd());
SocketEngine::AddFd(this, FD_WANT_FAST_READ | FD_WANT_NO_WRITE);
}
~ThreadSignalSocket()
{
SocketEngine::Close(send_fd);
SocketEngine::Close(this);
}
void Notify()
{
static constexpr char dummy = '*';
write(send_fd, &dummy, 1);
}
void OnEventHandlerRead() override
{
char dummy[128];
read(GetFd(), dummy, 128);
parent->OnNotify();
}
void OnEventHandlerWrite() override
{
ServerInstance->GlobalCulls.AddItem(this);
}
void OnEventHandlerError(int errcode) override
{
ThreadSignalSocket::OnEventHandlerWrite();
}
};
SocketThread::SocketThread()
{
socket = nullptr;
int fds[2];
if (pipe(fds))
throw CoreException("Could not create pipe " + std::string(strerror(errno)));
socket = new ThreadSignalSocket(this, fds[0], fds[1]);
}
#endif
void SocketThread::NotifyParent()
{
socket->Notify();
}
SocketThread::~SocketThread()
{
if (socket)
{
socket->Cull();
delete socket;
}
}
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