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EventLoop.cpp
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#include "net/EventLoop.h"
#include <assert.h>
#include <sys/eventfd.h> // for eventfd
#include <signal.h> // for ::signal
#include "base/Timestamp.h"
#include "base/Logger.h"
#include "thread/Thread.h"
#include "net/Channel.h"
#include "net/poller/Poller.h"
#include "net/TimerQueue.h"
#include "net/Eventfd.h"
using namespace zl::thread;
NAMESPACE_ZL_NET_START
namespace
{
// 如果往已关闭的client socket上继续write时，服务器进程会收到SIGPIPE信号而终止,
// 这里简单忽略该信号
class IgnoreSigPipe
{
public:
IgnoreSigPipe()
{
::signal(SIGPIPE, SIG_IGN);
}
}_dont_use_this_class_;
}
thread_local EventLoop *g_evloopInThisThread = 0;
EventLoop::EventLoop()
: currentThreadId_(this_thread::tid())
, currentActiveChannel_(NULL)
, running_(false)
, eventHandling_(false)
, callingPendingFunctors_(false)
, mutex_()
{
assert(!g_evloopInThisThread); // 避免在同一个线程中创建多个EventLoop对象(one EventLoop per thread)
poller_ = Poller::createPoller(this);
wakeupfd_ = new EventfdHandler();
wakeupChannel_ = new Channel(this, wakeupfd_->fd());
//wakeupChannel_->setReadCallback(std::bind(&EventLoop::handleRead, this));
wakeupChannel_->setReadCallback(std::bind(&EventfdHandler::read, wakeupfd_, static_cast<uint64_t*>(NULL)));
wakeupChannel_->enableReading(); // ready for read event of wakeupfd_
timerQueue_ = new TimerQueue(this);
g_evloopInThisThread = this;
}
EventLoop::~EventLoop()
{
wakeupChannel_->disableAll();
wakeupChannel_->remove();
Safe_Delete(wakeupfd_);
Safe_Delete(wakeupChannel_);
Safe_Delete(poller_);
}
void EventLoop::loop()
{
assertInLoopThread();
running_ = true;
Timestamp now;
while (running_)
{
activeChannels_.clear();
int timeoutMs = 0;
Timestamp nextExpired = timerQueue_->getNearestExpiration();
if(nextExpired.valid())
{
now = Timestamp::now();
double seconds = Timestamp::timeDiff(nextExpired, now);
LOG_INFO("nextExpired.valid() [%s][%s][%lf]", nextExpired.toString().c_str(), now.toString().c_str(), seconds);
if(seconds <= 0)
timeoutMs = 0;
else
timeoutMs = seconds * 1000;
}
else
{
#if defined(POLL_WAIT_INDEFINITE)
timeoutMs = -1;
#else
timeoutMs = 0;
#endif
}
now = poller_->poll_once(timeoutMs, activeChannels_);
//LOG_INFO("EventLoop::loop [%s][%d]", now.toString().c_str(), activeChannels_.size());
eventHandling_ = true;
for (ChannelList::iterator it = activeChannels_.begin(); it != activeChannels_.end(); ++it)
{
currentActiveChannel_ = *it;
currentActiveChannel_->handleEvent(now);
}
currentActiveChannel_ = NULL;
eventHandling_ = false;
timerQueue_->runTimer(now);
callPendingFunctors(); //处理poll等待过程中发生的事件
}
}
void EventLoop::quit()
{
running_ = false;
if (!isInLoopThread())
{
wakeupPoller();
}
}
void EventLoop::updateChannel(Channel* channel)
{
LOG_INFO("EventLoop[%0x]::updateChannel [%d]", this, channel->fd());
assert(channel->ownerLoop() == this);
assertInLoopThread();
poller_->updateChannel(channel);
}
void EventLoop::removeChannel(Channel* channel)
{
assert(channel->ownerLoop() == this);
assertInLoopThread();
if (eventHandling_)
{
assert(currentActiveChannel_ == channel ||
std::find(activeChannels_.begin(), activeChannels_.end(), channel) == activeChannels_.end());
}
poller_->removeChannel(channel);
}
bool EventLoop::hasChannel(Channel* channel)
{
return poller_->hasChannel(channel);
}
void EventLoop::runInLoop(const Functor& func)
{
LOG_INFO("EventLoop[%0x]::runInLoop [%d][%0x]", this, isInLoopThread(), &func);
if (isInLoopThread())
{
func();
}
else
{
queueInLoop(func);
}
}
void EventLoop::queueInLoop(const Functor& func)
{
LOG_INFO("EventLoop[%0x]::queueInLoop [%d][%0x]", this, isInLoopThread(), &func);
{
LockGuard<Mutex> lock(mutex_);
pendingFunctors_.push_back(func);
}
if (!isInLoopThread() || !callingPendingFunctors_) // may be should wakeup at any time
{
wakeupPoller();
}
}
TimerId EventLoop::addTimer(const TimerCallback& cb, const Timestamp& when)
{
return timerQueue_->addTimer(cb, when, 0);
}
TimerId EventLoop::addTimer(const TimerCallback& cb, double delaySeconds, bool repeat/* = false*/)
{
Timestamp when(Timestamp::now());
when += delaySeconds;
return timerQueue_->addTimer(cb, when, repeat ? delaySeconds : 0);
}
void EventLoop::cancelTimer(TimerId id)
{
timerQueue_->cancelTimer(id);
}
void EventLoop::callPendingFunctors()
{
std::vector<Functor> tmp_functors;
callingPendingFunctors_ = true;
{
LockGuard<Mutex> lock(mutex_);
tmp_functors.swap(pendingFunctors_);
}
for (size_t i = 0; i < tmp_functors.size(); ++i)
{
tmp_functors[i]();
}
callingPendingFunctors_ = false;
}
void EventLoop::assertInLoopThread() const
{
if(!isInLoopThread())
{
LOG_ALERT("EventLoop::abortNotInLoopThread - EventLoop [%0x] was created in threadId_ [%d], "
"but current thread id = [%d].", this, currentThreadId_, this_thread::tid());
assert("EventLoop::assertInLoopThread()" && 0);
}
}
void EventLoop::wakeupPoller()
{
uint64_t value = 1;
ssize_t n = wakeupfd_->write(value);
if (n != sizeof(value))
{
LOG_ERROR("EventLoop::wakeupPoller() wakeupfd_ write error[%d][%d]", n, errno);
}
}
NAMESPACE_ZL_NET_END