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spdylay/examples/EventPoll_kqueue.cc

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2012-02-09 12:06:46 -05:00
/*
* Spdylay - SPDY Library
*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "EventPoll_kqueue.h"
#include <unistd.h>
#include <cerrno>
#include <cassert>
namespace spdylay {
EventPoll::EventPoll(size_t max_events)
: max_events_(max_events), num_events_(0)
{
kq_ = kqueue();
assert(kq_ != -1);
evlist_ = new struct kevent[max_events_];
}
EventPoll::~EventPoll()
{
if(kq_ != -1) {
close(kq_);
}
delete [] evlist_;
}
int EventPoll::poll(int timeout)
{
timespec ts, *ts_ptr;
if(timeout == -1) {
ts_ptr = 0;
} else {
ts.tv_sec = timeout/1000;
ts.tv_nsec = (timeout%1000)*1000000;
ts_ptr = &ts;
}
num_events_ = 0;
int n;
while((n = kevent(kq_, evlist_, 0, evlist_, max_events_, ts_ptr)) == -1 &&
errno == EINTR);
if(n > 0) {
num_events_ = n;
}
return n;
}
int EventPoll::get_num_events()
{
return num_events_;
}
void* EventPoll::get_user_data(size_t p)
{
return evlist_[p].udata;
}
int EventPoll::get_events(size_t p)
{
int events = 0;
short filter = evlist_[p].filter;
if(filter == EVFILT_READ) {
events |= EP_POLLIN;
}
if(filter == EVFILT_WRITE) {
events |= EP_POLLOUT;
}
return events;
}
namespace {
int update_event(int kq, int fd, int events, void *user_data)
{
struct kevent changelist[2];
EV_SET(&changelist[0], fd, EVFILT_READ,
EV_ADD | ((events & EP_POLLIN) ? EV_ENABLE : EV_DISABLE),
0, 0, user_data);
EV_SET(&changelist[1], fd, EVFILT_WRITE,
EV_ADD | ((events & EP_POLLOUT) ? EV_ENABLE : EV_DISABLE),
0, 0, user_data);
timespec ts = { 0, 0 };
return kevent(kq, changelist, 2, changelist, 0, &ts);
}
} // namespace
int EventPoll::ctl_event(int op, int fd, int events, void *user_data)
{
return update_event(kq_, fd, events, user_data);
}
} // namespace spdylay