148 lines
3.9 KiB
C++
148 lines
3.9 KiB
C++
// Copyright (c) 2011-2015 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 "Dispatcher.h"
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#include <iostream>
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#include <ucontext.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/epoll.h>
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#include <assert.h>
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#include <sys/time.h>
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#include <errno.h>
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#include <stdexcept>
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using namespace System;
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void Dispatcher::contextProcedureStatic(void *context) {
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reinterpret_cast<Dispatcher*>(context)->contextProcedure();
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}
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Dispatcher::Dispatcher() {
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epoll = ::epoll_create1(0);
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if (epoll == -1) {
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std::cerr << "kqueue() fail errno=" << errno << std::endl;
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} else {
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currentContext = new ucontext_t;
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if (getcontext(reinterpret_cast<ucontext_t*>(currentContext)) == -1) {
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std::cerr << "getcontext() fail errno=" << errno << std::endl;
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} else {
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contextCount = 0;
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return;
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}
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}
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throw std::runtime_error("Dispatcher::Dispatcher");
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}
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Dispatcher::~Dispatcher() {
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assert(resumingContexts.empty());
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assert(reusableContexts.size() == contextCount);
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assert(spawningProcedures.empty());
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assert(reusableContexts.size() == allocatedStacks.size());
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while (!reusableContexts.empty()) {
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delete[] allocatedStacks.top();
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allocatedStacks.pop();
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delete static_cast<ucontext_t*>(reusableContexts.top());
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reusableContexts.pop();
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}
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while (!timers.empty()) {
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timers.pop();
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}
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if (-1 == close(epoll)) {
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std::cerr << "close() fail errno=" << errno << std::endl;
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}
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}
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void* Dispatcher::getCurrentContext() const {
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return currentContext;
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}
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int Dispatcher::getEpoll() const {
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return epoll;
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}
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void Dispatcher::pushContext(void* context) {
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resumingContexts.push(context);
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}
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void Dispatcher::spawn(std::function<void()>&& procedure) {
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ucontext_t *context;
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if (reusableContexts.empty()) {
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context = new ucontext_t;
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if (getcontext(context) == -1) { //makecontext precondition
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std::cerr << "getcontext() fail errno=" << errno << std::endl;
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throw std::runtime_error("Dispatcher::spawn()");
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}
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auto stackPointer = new uint8_t[64 * 1024];
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context->uc_stack.ss_sp = stackPointer;
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allocatedStacks.push(stackPointer);
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context->uc_stack.ss_size = 64 * 1024;
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makecontext(context, (void(*)())contextProcedureStatic, 1, reinterpret_cast<int*>(this));
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++contextCount;
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} else {
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context = static_cast<ucontext_t*>(reusableContexts.top());
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reusableContexts.pop();
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}
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resumingContexts.push(context);
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spawningProcedures.emplace(std::move(procedure));
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}
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void Dispatcher::clear() {
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//TODO
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}
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void Dispatcher::yield() {
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void* context;
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for (;;) {
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if (!resumingContexts.empty()) {
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context = resumingContexts.front();
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resumingContexts.pop();
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assert(context);
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break;
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}
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epoll_event event;
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int count = epoll_wait(epoll, &event, 1, -1);
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if (count == 1) {
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if ((event.events & EPOLLOUT) != 0) {
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context = static_cast<ContextExt *>(event.data.ptr)->writeContext;
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} else {
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context = static_cast<ContextExt *>(event.data.ptr)->context;
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}
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assert(context);
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break;
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}
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if (errno != EINTR) {
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std::cerr << "epoll_wait() failed, errno=" << errno << std::endl;
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throw std::runtime_error("Dispatcher::yield()");
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}
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}
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if (context != currentContext) {
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ucontext_t* oldContext = static_cast<ucontext_t*>(currentContext);
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currentContext = context;
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if (-1 == swapcontext(oldContext, static_cast<ucontext_t *>(context))) {
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std::cerr << "swapcontext() failed, errno=" << errno << std::endl;
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throw std::runtime_error("Dispatcher::yield()");
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}
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}
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}
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void Dispatcher::contextProcedure() {
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void* context = currentContext;
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for (;;) {
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assert(!spawningProcedures.empty());
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std::function<void()> procedure = std::move(spawningProcedures.front());
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spawningProcedures.pop();
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procedure();
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reusableContexts.push(context);
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yield();
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}
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}
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