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EventLoop.cpp
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executable file
·130 lines (114 loc) · 3.25 KB
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// @Author Lin Ya
// @Email xxbbb@vip.qq.com
#include "EventLoop.h"
#include <sys/epoll.h>
#include <sys/eventfd.h>
#include <iostream>
#include "Util.h"
#include "base/Logging.h"
using namespace std;
__thread EventLoop* t_loopInThisThread = 0;
int createEventfd() {
int evtfd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
if (evtfd < 0) {
LOG << "Failed in eventfd";
abort();
}
return evtfd;
}
EventLoop::EventLoop()
: looping_(false),
poller_(new Epoll()),
wakeupFd_(createEventfd()),
quit_(false),
eventHandling_(false),
callingPendingFunctors_(false),
threadId_(CurrentThread::tid()),
pwakeupChannel_(new Channel(this, wakeupFd_)) {
if (t_loopInThisThread) {
// LOG << "Another EventLoop " << t_loopInThisThread << " exists in this
// thread " << threadId_;
} else {
t_loopInThisThread = this;
}
// pwakeupChannel_->setEvents(EPOLLIN | EPOLLET | EPOLLONESHOT);
pwakeupChannel_->setEvents(EPOLLIN | EPOLLET);
pwakeupChannel_->setReadHandler(bind(&EventLoop::handleRead, this));
pwakeupChannel_->setConnHandler(bind(&EventLoop::handleConn, this));
poller_->epoll_add(pwakeupChannel_, 0);
}
void EventLoop::handleConn() {
// poller_->epoll_mod(wakeupFd_, pwakeupChannel_, (EPOLLIN | EPOLLET |
// EPOLLONESHOT), 0);
updatePoller(pwakeupChannel_, 0);
}
EventLoop::~EventLoop() {
// wakeupChannel_->disableAll();
// wakeupChannel_->remove();
close(wakeupFd_);
t_loopInThisThread = NULL;
}
void EventLoop::wakeup() {
uint64_t one = 1;
ssize_t n = writen(wakeupFd_, (char*)(&one), sizeof one);
if (n != sizeof one) {
LOG << "EventLoop::wakeup() writes " << n << " bytes instead of 8";
}
}
void EventLoop::handleRead() {
uint64_t one = 1;
ssize_t n = readn(wakeupFd_, &one, sizeof one);
if (n != sizeof one) {
LOG << "EventLoop::handleRead() reads " << n << " bytes instead of 8";
}
// pwakeupChannel_->setEvents(EPOLLIN | EPOLLET | EPOLLONESHOT);
pwakeupChannel_->setEvents(EPOLLIN | EPOLLET);
}
void EventLoop::runInLoop(Functor&& cb) {
if (isInLoopThread())
cb();
else
queueInLoop(std::move(cb));
}
void EventLoop::queueInLoop(Functor&& cb) {
{
MutexLockGuard lock(mutex_);
pendingFunctors_.emplace_back(std::move(cb));
}
if (!isInLoopThread() || callingPendingFunctors_) wakeup();
}
void EventLoop::loop() {
assert(!looping_);
assert(isInLoopThread());
looping_ = true;
quit_ = false;
// LOG_TRACE << "EventLoop " << this << " start looping";
std::vector<SP_Channel> ret;
while (!quit_) {
// cout << "doing" << endl;
ret.clear();
ret = poller_->poll();
eventHandling_ = true;
for (auto& it : ret) it->handleEvents();
eventHandling_ = false;
doPendingFunctors();
poller_->handleExpired();
}
looping_ = false;
}
void EventLoop::doPendingFunctors() {
std::vector<Functor> functors;
callingPendingFunctors_ = true;
{
MutexLockGuard lock(mutex_);
functors.swap(pendingFunctors_);
}
for (size_t i = 0; i < functors.size(); ++i) functors[i]();
callingPendingFunctors_ = false;
}
void EventLoop::quit() {
quit_ = true;
if (!isInLoopThread()) {
wakeup();
}
}