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FdEventsPoller.cpp
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FdEventsPoller.cpp
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#include "FdEventsPoller.h"
#include <stdio.h>
#include <assert.h>
#include <errno.h>
FdEventsPoller::FdEventsPoller()
{
}
FdEventsPoller::~FdEventsPoller()
{
}
FdEvent* FdEventsPoller::addFdEvent(int fd, eventCallback cb)
{
assert(fd);
assert(!getChannel(fd));
FdEvent *fde = FdEvent::newFdEvent(fd);
fde->events_ = (FDEVENT_IN | FDEVENT_HUP | FDEVENT_ERR);
fde->callback_ = cb;
addFdEvent(fde);
return fde;
}
int FdEventsPoller::addFdEvent(FdEvent *fe)
{
assert(fe);
assert(!hasChannel(fe));
return modFdEvent(fe);
}
int FdEventsPoller::modFdEvent(FdEvent *fde)
{
int fd = fde->fd();
printf("FdEventsPoller::updateChannel[%d]\n", fd);
int events = fde->events();
int pevents = FDEVENT_NONE;
if (events & FDEVENT_IN) pevents |= POLLIN;
if (events & FDEVENT_OUT) pevents |= POLLOUT;
pevents |= POLLERR | POLLHUP;
if (channelIter_.find(fde) != channelIter_.end()) //exist, update
{
assert(getChannel(fd) == fde);
int idx = channelIter_[fde];
printf("FdEventsPoller::updateChannel fd2 [%d][%d]\n", idx, channelIter_[fde]);
assert(0 <= idx && idx < static_cast<int>(pollfds_.size()));
struct pollfd& pfd = pollfds_[idx];
assert(pfd.fd == fde->fd() || pfd.fd == -fde->fd() - 1);
pfd.events = static_cast<short>(pevents);
pfd.revents = 0;
if (fde->isNoneEvent())
{
printf("FdEventsPoller::updateChannel [%d][%p][%d] NoneEvent\n", fd, fde, pfd.events);
pfd.fd = -fde->fd() - 1;
}
}
else //new, add
{
assert(getChannel(fd) == NULL);
struct pollfd pfd;
pfd.fd = fd;
pfd.events = static_cast<short>(pevents);
pfd.revents = 0;
pollfds_.push_back(pfd);
channelMap_[fd] = fde;
channelIter_.insert(std::make_pair(fde, pollfds_.size() - 1));
}
return 0;
}
int FdEventsPoller::delFdEvent(FdEvent *fde)
{
if (!hasChannel(fde))
return -1;
int fd = fde->fd();
int idx = channelIter_[fde];
printf("FdEventsPoller::removeChannel [%d][%d][%p]\n", fd, idx, fde);
assert(getChannel(fd) == fde && "the remove socket must be already exist");
assert(fde->isNoneEvent());
assert(0 <= idx && idx < static_cast<int>(pollfds_.size()));
const struct pollfd& pfd = pollfds_[idx];
assert(pfd.fd == fde->fd() || pfd.fd == -fde->fd() - 1); // 直接调用delFdEvent或者先调用过modFdEvent
assert(pfd.events == fde->events() || fde->events() == FDEVENT_NONE); // 同上
(void)(pfd);
size_t n = channelMap_.erase(fd);
(void)(n);
assert(n == 1);
if ((idx) == static_cast<int>(pollfds_.size()) - 1) // last one
{
}
else
{
int lastfd = pollfds_.back().fd;
iter_swap(pollfds_.begin() + idx, pollfds_.end() - 1);
if (lastfd < 0)
{
lastfd = -lastfd - 1;
}
channelIter_[getChannel(lastfd)] = idx;
}
pollfds_.pop_back();
channelIter_.erase(fde);
FdEvent::deleteFdEvent(fde);
return 0;
}
int FdEventsPoller::poll(std::vector<FdEvent *>& fdevents, int timeoutMs)
{
int numEvents = ::poll(&*pollfds_.begin(), pollfds_.size(), timeoutMs);
int savedErrno = errno;
if (numEvents > 0)
{
printf("FdEventsPoller::poll: events happended[%d]\n", numEvents);
fireActiveChannels(numEvents, fdevents);
}
else if (numEvents == 0)
{
printf("FdEventsPoller::poll: nothing happended\n");
}
else
{
if (savedErrno != EINTR)
{
errno = savedErrno;
printf("FdEventsPoller::poll: error [%d]\n", errno);
}
}
return numEvents;
}
void FdEventsPoller::fireActiveChannels(int numEvents, ChannelList& fdevents) const
{
for (PollFdList::const_iterator it = pollfds_.begin(); numEvents > 0 && it != pollfds_.end(); ++it)
{
if (it->revents > 0)
{
--numEvents;
FdEvent *fde = getChannel(it->fd);
assert(fde && "the channel must be already exist");
//channel->set_revents(it->revents);
int revents = FDEVENT_NONE;
if (it->revents & POLLIN) revents |= FDEVENT_IN;
if (it->revents & POLLPRI) revents |= FDEVENT_PRI;
if (it->revents & POLLOUT) revents |= FDEVENT_OUT;
if (it->revents & POLLERR) revents |= FDEVENT_ERR;
if (it->revents & POLLHUP) revents |= FDEVENT_HUP;
if (it->revents & POLLNVAL) revents |= FDEVENT_NVAL; // never happen
fde->set_revents(revents);
fdevents.push_back(fde);
//LOG_INFO("PollPoller::fireActiveChannels [%d][%d]", it->fd, it->revents);
}
}
}