130 lines
3.9 KiB
C++
130 lines
3.9 KiB
C++
// Copyright (c) 2011-2016 The Cryptonote developers
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// Distributed under the MIT/X11 software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "Timer.h"
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#include <cassert>
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#include <stdexcept>
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#include <sys/timerfd.h>
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#include <sys/epoll.h>
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#include <unistd.h>
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#include "Dispatcher.h"
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#include <System/ErrorMessage.h>
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#include <System/InterruptedException.h>
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namespace System {
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Timer::Timer() : dispatcher(nullptr) {
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}
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Timer::Timer(Dispatcher& dispatcher) : dispatcher(&dispatcher), context(nullptr), timer(-1) {
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}
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Timer::Timer(Timer&& other) : dispatcher(other.dispatcher) {
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if (other.dispatcher != nullptr) {
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assert(other.context == nullptr);
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timer = other.timer;
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context = nullptr;
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other.dispatcher = nullptr;
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}
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}
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Timer::~Timer() {
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assert(dispatcher == nullptr || context == nullptr);
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}
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Timer& Timer::operator=(Timer&& other) {
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assert(dispatcher == nullptr || context == nullptr);
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dispatcher = other.dispatcher;
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if (other.dispatcher != nullptr) {
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assert(other.context == nullptr);
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timer = other.timer;
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context = nullptr;
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other.dispatcher = nullptr;
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other.timer = -1;
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}
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return *this;
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}
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void Timer::sleep(std::chrono::nanoseconds duration) {
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assert(dispatcher != nullptr);
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assert(context == nullptr);
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if (dispatcher->interrupted()) {
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throw InterruptedException();
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}
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if(duration.count() == 0 ) {
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dispatcher->yield();
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} else {
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timer = dispatcher->getTimer();
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auto seconds = std::chrono::duration_cast<std::chrono::seconds>(duration);
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itimerspec expires;
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expires.it_interval.tv_nsec = expires.it_interval.tv_sec = 0;
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expires.it_value.tv_sec = seconds.count();
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expires.it_value.tv_nsec = std::chrono::duration_cast<std::chrono::nanoseconds>(duration - seconds).count();
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timerfd_settime(timer, 0, &expires, NULL);
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ContextPair contextPair;
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OperationContext timerContext;
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timerContext.interrupted = false;
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timerContext.context = dispatcher->getCurrentContext();
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contextPair.writeContext = nullptr;
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contextPair.readContext = &timerContext;
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epoll_event timerEvent;
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timerEvent.events = EPOLLIN | EPOLLONESHOT;
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timerEvent.data.ptr = &contextPair;
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if (epoll_ctl(dispatcher->getEpoll(), EPOLL_CTL_MOD, timer, &timerEvent) == -1) {
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throw std::runtime_error("Timer::sleep, epoll_ctl failed, " + lastErrorMessage());
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}
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dispatcher->getCurrentContext()->interruptProcedure = [&]() {
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assert(dispatcher != nullptr);
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assert(context != nullptr);
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OperationContext* timerContext = static_cast<OperationContext*>(context);
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if (!timerContext->interrupted) {
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uint64_t value = 0;
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if(::read(timer, &value, sizeof value) == -1 ){
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if(errno == EAGAIN || errno == EWOULDBLOCK) {
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timerContext->interrupted = true;
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dispatcher->pushContext(timerContext->context);
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} else {
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throw std::runtime_error("Timer::interrupt, read failed, " + lastErrorMessage());
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}
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} else {
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assert(value>0);
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dispatcher->pushContext(timerContext->context);
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}
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epoll_event timerEvent;
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timerEvent.events = 0;
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timerEvent.data.ptr = nullptr;
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if (epoll_ctl(dispatcher->getEpoll(), EPOLL_CTL_MOD, timer, &timerEvent) == -1) {
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throw std::runtime_error("Timer::interrupt, epoll_ctl failed, " + lastErrorMessage());
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}
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}
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};
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context = &timerContext;
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dispatcher->dispatch();
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dispatcher->getCurrentContext()->interruptProcedure = nullptr;
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assert(dispatcher != nullptr);
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assert(timerContext.context == dispatcher->getCurrentContext());
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assert(contextPair.writeContext == nullptr);
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assert(context == &timerContext);
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context = nullptr;
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timerContext.context = nullptr;
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dispatcher->pushTimer(timer);
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if (timerContext.interrupted) {
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throw InterruptedException();
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}
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}
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}
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}
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