99 lines
2.2 KiB
C++
99 lines
2.2 KiB
C++
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// Copyright (c) 2012-2014, The CryptoNote developers, The Bytecoin developers
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//
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// This file is part of Bytecoin.
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//
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// Bytecoin is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Bytecoin is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with Bytecoin. If not, see <http://www.gnu.org/licenses/>.
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#include "Event.h"
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#include <cassert>
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#include "System.h"
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struct Event::Waiter {
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Event::Waiter* next;
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void* context;
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};
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Event::Event() : system(nullptr) {
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}
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Event::Event(System& system) : system(&system), first(nullptr), state(false) {
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}
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Event::Event(Event&& other) : system(other.system) {
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if (other.system != nullptr) {
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first = other.first;
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if (other.first != nullptr) {
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last = other.last;
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}
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state = other.state;
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other.system = nullptr;
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}
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}
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Event::~Event() {
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assert(first == nullptr);
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}
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Event& Event::operator=(Event&& other) {
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assert(first == nullptr);
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system = other.system;
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if (other.system != nullptr) {
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first = other.first;
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if (other.first != nullptr) {
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last = other.last;
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}
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state = other.state;
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other.system = 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(system != nullptr);
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return state;
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}
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void Event::clear() {
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assert(system != nullptr);
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state = false;
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}
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void Event::set() {
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assert(system != nullptr);
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state = true;
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for (Waiter* waiter = first; waiter != nullptr; waiter = waiter->next) {
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system->pushContext(waiter->context);
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}
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first = nullptr;
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}
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void Event::wait() {
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assert(system != nullptr);
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Waiter waiter = {nullptr, system->getCurrentContext()};
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if (first != nullptr) {
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last->next = &waiter;
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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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while (!state) {
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system->yield();
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}
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}
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