134 lines
3 KiB
C++
Executable file
134 lines
3 KiB
C++
Executable file
// 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 "Event.h"
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#include <cassert>
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#include <System/Dispatcher.h>
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#include <System/InterruptedException.h>
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namespace System {
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namespace {
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struct EventWaiter {
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bool interrupted;
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EventWaiter* prev;
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EventWaiter* next;
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NativeContext* context;
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};
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}
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Event::Event() : dispatcher(nullptr) {
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}
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Event::Event(Dispatcher& dispatcher) : dispatcher(&dispatcher), state(false), first(nullptr) {
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}
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Event::Event(Event&& other) : dispatcher(other.dispatcher) {
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if (dispatcher != nullptr) {
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state = other.state;
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if (!state) {
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assert(other.first == nullptr);
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first = nullptr;
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}
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other.dispatcher = nullptr;
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}
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}
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Event::~Event() {
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assert(dispatcher == nullptr || state || first == nullptr);
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}
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Event& Event::operator=(Event&& other) {
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assert(dispatcher == nullptr || state || first == nullptr);
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dispatcher = other.dispatcher;
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if (dispatcher != nullptr) {
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state = other.state;
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if (!state) {
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assert(other.first == nullptr);
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first = nullptr;
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}
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other.dispatcher = nullptr;
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}
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return *this;
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}
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bool Event::get() const {
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assert(dispatcher != nullptr);
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return state;
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}
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void Event::clear() {
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assert(dispatcher != nullptr);
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if (state) {
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state = false;
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first = nullptr;
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}
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}
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void Event::set() {
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assert(dispatcher != nullptr);
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if (!state) {
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state = true;
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for (EventWaiter* waiter = static_cast<EventWaiter*>(first); waiter != nullptr; waiter = waiter->next) {
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waiter->context->interruptProcedure = nullptr;
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dispatcher->pushContext(waiter->context);
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}
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}
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}
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void Event::wait() {
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assert(dispatcher != nullptr);
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if (dispatcher->interrupted()) {
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throw InterruptedException();
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}
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if (!state) {
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EventWaiter waiter = { false, nullptr, nullptr, dispatcher->getCurrentContext() };
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waiter.context->interruptProcedure = [&] {
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if (waiter.next != nullptr) {
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assert(waiter.next->prev == &waiter);
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waiter.next->prev = waiter.prev;
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} else {
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assert(last == &waiter);
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last = waiter.prev;
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}
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if (waiter.prev != nullptr) {
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assert(waiter.prev->next == &waiter);
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waiter.prev->next = waiter.next;
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} else {
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assert(first == &waiter);
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first = waiter.next;
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}
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assert(!waiter.interrupted);
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waiter.interrupted = true;
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dispatcher->pushContext(waiter.context);
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};
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if (first != nullptr) {
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static_cast<EventWaiter*>(last)->next = &waiter;
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waiter.prev = static_cast<EventWaiter*>(last);
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} else {
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first = &waiter;
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}
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last = &waiter;
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dispatcher->dispatch();
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assert(waiter.context == dispatcher->getCurrentContext());
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assert( waiter.context->interruptProcedure == nullptr);
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assert(dispatcher != nullptr);
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if (waiter.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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