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/*
* Tencent is pleased to support the open source community by making Pebble available.
* Copyright (C) 2016 THL A29 Limited, a Tencent company. All rights reserved.
* Licensed under the MIT License (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
* http://opensource.org/licenses/MIT
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*
*/
#include <algorithm>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/timerfd.h>
#include <unistd.h>
#include "common/time_utility.h"
#include "common/timer.h"
namespace pebble {
#if 0
FdTimer::FdTimer() {
m_max_timer_num = 1024;
m_timer_seqid = 0;
m_last_error[0] = 0;
// 2.6.8以上内核版本参数无效，填128仅做内核版本兼容性保证
m_epoll_fd = epoll_create(128);
if (m_epoll_fd < 0) {
_LOG_LAST_ERROR("epoll_create failed(%s)", strerror(errno));
}
}
FdTimer::~FdTimer() {
int32_t fd = -1;
cxx::unordered_map<int64_t, TimerItem*>::iterator it = m_timers.begin();
for (; it != m_timers.end(); ++it) {
fd = it->second->fd;
if (epoll_ctl(m_epoll_fd, EPOLL_CTL_DEL, fd, NULL) < 0) {
_LOG_LAST_ERROR("epoll_ctl del %d failed(%s)", fd, strerror(errno));
}
close(fd);
delete it->second;
it->second = NULL;
}
m_timers.clear();
if (m_epoll_fd >= 0) {
close(m_epoll_fd);
}
}
int64_t FdTimer::StartTimer(uint32_t timeout_ms, const TimeoutCallback& cb) {
if (!cb || 0 == timeout_ms) {
_LOG_LAST_ERROR("param is invalid: timeout_ms = %u, cb = %d", timeout_ms, (cb ? true : false));
return kTIMER_INVALID_PARAM;
}
if (m_timers.size() >= m_max_timer_num) {
_LOG_LAST_ERROR("timer over the limit(%d)", m_max_timer_num);
return kTIMER_NUM_OUT_OF_RANGE;
}
// 创建timer fd
int32_t fd = timerfd_create(CLOCK_REALTIME, 0);
if (fd < 0) {
_LOG_LAST_ERROR("timerfd_create failed(%s)", strerror(errno));
return kSYSTEM_ERROR;
}
// 使用fcntl替代create的第2个参数仅做内核版本兼容性保证
int32_t flags = fcntl(fd, F_GETFL, 0);
flags < 0 ? flags = O_NONBLOCK : flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0) {
close(fd);
_LOG_LAST_ERROR("fcntl %d failed(%s)", fd, strerror(errno));
return kSYSTEM_ERROR;
}
// 设置超时时间
struct itimerspec timeout;
timeout.it_value.tv_sec = timeout_ms / 1000;
timeout.it_value.tv_nsec = (timeout_ms % 1000) * 1000 * 1000;
timeout.it_interval.tv_sec = timeout.it_value.tv_sec;
timeout.it_interval.tv_nsec = timeout.it_value.tv_nsec;
if (timerfd_settime(fd, 0, &timeout, NULL) < 0) {
close(fd);
_LOG_LAST_ERROR("timerfd_settime %d failed(%s)", fd, strerror(errno));
return kSYSTEM_ERROR;
}
TimerItem* timeritem = new TimerItem();
timeritem->fd = fd;
timeritem->cb = cb;
timeritem->id = m_timer_seqid;
struct epoll_event event;
event.data.ptr = timeritem;
event.events = EPOLLIN | EPOLLET;
if (epoll_ctl(m_epoll_fd, EPOLL_CTL_ADD, fd, &event) < 0) {
close(fd);
delete timeritem;
timeritem = NULL;
_LOG_LAST_ERROR("epoll_ctl add %d failed(%s)", fd, strerror(errno));
return kSYSTEM_ERROR;
}
m_timers[m_timer_seqid] = timeritem;
return m_timer_seqid++;
}
int32_t FdTimer::StopTimer(int64_t timer_id) {
cxx::unordered_map<int64_t, TimerItem*>::iterator it = m_timers.find(timer_id);
if (m_timers.end() == it) {
_LOG_LAST_ERROR("timer id %ld not exist", timer_id);
return kTIMER_UNEXISTED;
}
int32_t fd = it->second->fd;
if (epoll_ctl(m_epoll_fd, EPOLL_CTL_DEL, fd, NULL) < 0) {
_LOG_LAST_ERROR("epoll_ctl del %d failed(%s)", fd, strerror(errno));
}
close(fd);
delete it->second;
it->second = NULL;
m_timers.erase(it);
return 0;
}
int32_t FdTimer::Update() {
const size_t MAX_EVENTS = 256;
const uint32_t BUFF_LEN = 128;
struct epoll_event events[MAX_EVENTS];
int32_t num = epoll_wait(m_epoll_fd, events, std::min(MAX_EVENTS, m_timers.size()), 0);
if (num <= 0) {
return 0;
}
char buf[BUFF_LEN] = {0};
int64_t timerid = 0;
int32_t fd = -1;
int32_t ret = 0;
TimerItem* timeritem = NULL;
for (int32_t i = 0; i < num; i++) {
timeritem = static_cast<TimerItem*>(events[i].data.ptr);
while (read(timeritem->fd, buf, BUFF_LEN) > 0) {} // NOLINT
// 定时器可能在回调中被停掉，这里记录有效值
timerid = timeritem->id;
fd = timeritem->fd;
ret = timeritem->cb();
// 返回 <0 删除定时器，=0 继续，>0按新的超时时间重启定时器
if (ret < 0) {
StopTimer(timerid);
} else if (ret > 0) {
struct itimerspec timeout;
timeout.it_value.tv_sec = ret / 1000;
timeout.it_value.tv_nsec = (ret % 1000) * 1000 * 1000;
timeout.it_interval.tv_sec = timeout.it_value.tv_sec;
timeout.it_interval.tv_nsec = timeout.it_value.tv_nsec;
timerfd_settime(fd, 0, &timeout, NULL);
}
}
return num;
}
#endif
SequenceTimer::SequenceTimer() {
m_timer_seqid = 0;
m_last_error[0] = 0;
}
SequenceTimer::~SequenceTimer() {
}
int64_t SequenceTimer::StartTimer(uint32_t timeout_ms, const TimeoutCallback& cb) {
if (!cb || 0 == timeout_ms) {
_LOG_LAST_ERROR("param is invalid: timeout_ms = %u, cb = %d", timeout_ms, (cb ? true : false));
return kTIMER_INVALID_PARAM;
}
cxx::shared_ptr<TimerItem> item(new TimerItem);
item->stoped = false;
item->id = m_timer_seqid;
item->timeout = TimeUtility::GetCurrentMS() + timeout_ms;
item->cb = cb;
m_timers[timeout_ms].push_back(item);
m_id_2_timer[m_timer_seqid] = item;
return m_timer_seqid++;
}
int32_t SequenceTimer::StopTimer(int64_t timer_id) {
cxx::unordered_map<int64_t, cxx::shared_ptr<TimerItem> >::iterator it =
m_id_2_timer.find(timer_id);
if (m_id_2_timer.end() == it) {
_LOG_LAST_ERROR("timer id %ld not exist", timer_id);
return kTIMER_UNEXISTED;
}
it->second->stoped = true;
m_id_2_timer.erase(it);
return 0;
}
int32_t SequenceTimer::Update() {
int32_t num = 0;
int64_t now = TimeUtility::GetCurrentMS();
int32_t ret = 0;
uint32_t old_timeout = 0;
uint32_t timer_map_size = m_timers.size();
cxx::unordered_map<uint32_t, std::list<cxx::shared_ptr<TimerItem> > >::iterator mit =
m_timers.begin();
std::list<cxx::shared_ptr<TimerItem> >::iterator lit;
while (mit != m_timers.end()) {
// 暂不考虑主动清理，顺序定时器即使不清理，也不会占用太多内存，频繁清理反而会影响性能
std::list<cxx::shared_ptr<TimerItem> >& timer_list = mit->second;
while (!timer_list.empty()) {
lit = timer_list.begin();
if ((*lit)->stoped) {
timer_list.erase(lit);
continue;
}
if ((*lit)->timeout > now) {
// 此队列后面的都未超时
break;
}
old_timeout = mit->first;
ret = (*lit)->cb();
// 返回 <0 删除定时器，=0 继续，>0按新的超时时间重启定时器
if (ret < 0) {
m_id_2_timer.erase((*lit)->id);
timer_list.erase(lit);
} else {
cxx::shared_ptr<TimerItem> back_item = *lit;
timer_list.erase(lit);
if (ret > 0) {
back_item->timeout = now + ret;
m_timers[ret].push_back(back_item);
} else {
back_item->timeout = now + old_timeout;
timer_list.push_back(back_item);
}
}
++num;
}
if (timer_map_size != m_timers.size()) {
// 暂时用此方法防止迭代器失效，m_timers目前实现只会增加不会减少
break;
}
++mit;
}
return num;
}
} // namespace pebble