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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2014 UnitedStack <haomai@unitedstack.com>
*
* Author: Haomai Wang <haomaiwang@gmail.com>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include "common/errno.h"
#include "EventKqueue.h"
#define dout_subsys ceph_subsys_ms
#undef dout_prefix
#define dout_prefix *_dout << "KqueueDriver."
#define KEVENT_NOWAIT 0
int KqueueDriver::test_kqfd() {
struct kevent ke[1];
if (kevent(kqfd, ke, 0, NULL, 0, KEVENT_NOWAIT) == -1) {
ldout(cct,0) << __func__ << " invalid kqfd = " << kqfd
<< cpp_strerror(errno) << dendl;
return -errno;
}
return kqfd;
}
int KqueueDriver::restore_events() {
struct kevent ke[2];
int i;
ldout(cct,30) << __func__ << " on kqfd = " << kqfd << dendl;
for(i=0;i<size;i++) {
int num = 0;
if (sav_events[i].mask == 0 )
continue;
ldout(cct,30) << __func__ << " restore kqfd = " << kqfd
<< " fd = " << i << " mask " << sav_events[i].mask << dendl;
if (sav_events[i].mask & EVENT_READABLE)
EV_SET(&ke[num++], i, EVFILT_READ, EV_ADD, 0, 0, NULL);
if (sav_events[i].mask & EVENT_WRITABLE)
EV_SET(&ke[num++], i, EVFILT_WRITE, EV_ADD, 0, 0, NULL);
if (num) {
if (kevent(kqfd, ke, num, NULL, 0, KEVENT_NOWAIT) == -1) {
ldout(cct,0) << __func__ << " unable to add event: "
<< cpp_strerror(errno) << dendl;
return -errno;
}
}
}
return 0;
}
int KqueueDriver::test_thread_change(const char* funcname) {
// check to see if we changed thread, because that invalidates
// the kqfd and we need to restore that
int oldkqfd = kqfd;
if (!pthread_equal(mythread, pthread_self())) {
ldout(cct,20) << funcname << " We changed thread from " << mythread
<< " to " << pthread_self() << dendl;
mythread = pthread_self();
kqfd = -1;
} else if ((kqfd != -1) && (test_kqfd() < 0)) {
// should this ever happen?
// It would be strange to change kqfd with thread change.
// Might nee to change this into an ceph_assert() in the future.
ldout(cct,0) << funcname << " Warning: Recreating old kqfd. "
<< "This should not happen!!!" << dendl;
kqfd = -1;
}
if (kqfd == -1) {
kqfd = kqueue();
ldout(cct,30) << funcname << " kqueue: new kqfd = " << kqfd
<< " (was: " << oldkqfd << ")"
<< dendl;
if (kqfd < 0) {
lderr(cct) << funcname << " unable to do kqueue: "
<< cpp_strerror(errno) << dendl;
return -errno;
}
if (restore_events()< 0) {
lderr(cct) << funcname << " unable restore all events "
<< cpp_strerror(errno) << dendl;
return -errno;
}
}
return 0;
}
int KqueueDriver::init(EventCenter *c, int nevent)
{
// keep track of possible changes of our thread
// because change of thread kills the kqfd
mythread = pthread_self();
// Reserve the space to accept the kevent return events.
res_events = (struct kevent*)malloc(sizeof(struct kevent)*nevent);
if (!res_events) {
lderr(cct) << __func__ << " unable to malloc memory: "
<< cpp_strerror(errno) << dendl;
return -ENOMEM;
}
memset(res_events, 0, sizeof(struct kevent)*nevent);
size = nevent;
// Reserve the space to keep all of the events set, so it can be redone
// when we change trhread ID.
sav_events = (struct SaveEvent*)malloc(sizeof(struct SaveEvent)*nevent);
if (!sav_events) {
lderr(cct) << __func__ << " unable to malloc memory: "
<< cpp_strerror(errno) << dendl;
return -ENOMEM;
}
memset(sav_events, 0, sizeof(struct SaveEvent)*nevent);
sav_max = nevent;
// Delay assigning a descriptor until it is really needed.
// kqfd = kqueue();
kqfd = -1;
return 0;
}
int KqueueDriver::add_event(int fd, int cur_mask, int add_mask)
{
struct kevent ke[2];
int num = 0;
ldout(cct,30) << __func__ << " add event kqfd = " << kqfd << " fd = " << fd
<< " cur_mask = " << cur_mask << " add_mask = " << add_mask
<< dendl;
int r = test_thread_change(__func__);
if ( r < 0 )
return r;
if (add_mask & EVENT_READABLE)
EV_SET(&ke[num++], fd, EVFILT_READ, EV_ADD|EV_CLEAR, 0, 0, NULL);
if (add_mask & EVENT_WRITABLE)
EV_SET(&ke[num++], fd, EVFILT_WRITE, EV_ADD|EV_CLEAR, 0, 0, NULL);
if (num) {
if (kevent(kqfd, ke, num, NULL, 0, KEVENT_NOWAIT) == -1) {
lderr(cct) << __func__ << " unable to add event: "
<< cpp_strerror(errno) << dendl;
return -errno;
}
}
// keep what we set
if (fd >= sav_max)
resize_events(sav_max+5000);
sav_events[fd].mask = cur_mask | add_mask;
return 0;
}
int KqueueDriver::del_event(int fd, int cur_mask, int del_mask)
{
struct kevent ke[2];
int num = 0;
int mask = cur_mask & del_mask;
ldout(cct,30) << __func__ << " delete event kqfd = " << kqfd
<< " fd = " << fd << " cur_mask = " << cur_mask
<< " del_mask = " << del_mask << dendl;
int r = test_thread_change(__func__);
if ( r < 0 )
return r;
if (mask & EVENT_READABLE)
EV_SET(&ke[num++], fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
if (mask & EVENT_WRITABLE)
EV_SET(&ke[num++], fd, EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
if (num) {
int r = 0;
if ((r = kevent(kqfd, ke, num, NULL, 0, KEVENT_NOWAIT)) < 0) {
lderr(cct) << __func__ << " kevent: delete fd=" << fd << " mask=" << mask
<< " failed." << cpp_strerror(errno) << dendl;
return -errno;
}
}
// keep the administration
sav_events[fd].mask = cur_mask & ~del_mask;
return 0;
}
int KqueueDriver::resize_events(int newsize)
{
ldout(cct,30) << __func__ << " kqfd = " << kqfd << "newsize = " << newsize
<< dendl;
if (newsize > sav_max) {
sav_events = (struct SaveEvent*)realloc(sav_events, sizeof(struct SaveEvent)*newsize);
if (!sav_events) {
lderr(cct) << __func__ << " unable to realloc memory: "
<< cpp_strerror(errno) << dendl;
ceph_assert(sav_events);
return -ENOMEM;
}
memset(&sav_events[size], 0, sizeof(struct SaveEvent)*(newsize-sav_max));
sav_max = newsize;
}
return 0;
}
int KqueueDriver::event_wait(std::vector<FiredFileEvent> &fired_events,
struct timeval *tvp)
{
int retval, numevents = 0;
struct timespec timeout;
ldout(cct,10) << __func__ << " kqfd = " << kqfd << dendl;
int r = test_thread_change(__func__);
if ( r < 0 )
return r;
if (tvp != NULL) {
timeout.tv_sec = tvp->tv_sec;
timeout.tv_nsec = tvp->tv_usec * 1000;
ldout(cct,20) << __func__ << " "
<< timeout.tv_sec << " sec "
<< timeout.tv_nsec << " nsec"
<< dendl;
retval = kevent(kqfd, NULL, 0, res_events, size, &timeout);
} else {
ldout(cct,30) << __func__ << " event_wait: " << " NULL" << dendl;
retval = kevent(kqfd, NULL, 0, res_events, size, KEVENT_NOWAIT);
}
ldout(cct,25) << __func__ << " kevent retval: " << retval << dendl;
if (retval < 0) {
lderr(cct) << __func__ << " kqueue error: "
<< cpp_strerror(errno) << dendl;
return -errno;
} else if (retval == 0) {
ldout(cct,5) << __func__ << " Hit timeout("
<< timeout.tv_sec << " sec "
<< timeout.tv_nsec << " nsec"
<< ")." << dendl;
} else {
int j;
numevents = retval;
fired_events.resize(numevents);
for (j = 0; j < numevents; j++) {
int mask = 0;
struct kevent *e = res_events + j;
if (e->filter == EVFILT_READ) mask |= EVENT_READABLE;
if (e->filter == EVFILT_WRITE) mask |= EVENT_WRITABLE;
if (e->flags & EV_ERROR) mask |= EVENT_READABLE|EVENT_WRITABLE;
fired_events[j].fd = (int)e->ident;
fired_events[j].mask = mask;
}
}
return numevents;
}
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