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https://github.com/Atmosphere-NX/Atmosphere.git
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105 lines
2.9 KiB
C++
105 lines
2.9 KiB
C++
/*
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* Copyright (c) 2018-2019 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "impl/os_waitable_object_list.hpp"
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namespace ams::os {
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Event::Event(bool a, bool s) : auto_clear(a), signaled(s) {
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new (GetPointer(this->waitable_object_list_storage)) impl::WaitableObjectList();
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}
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Event::~Event() {
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GetReference(this->waitable_object_list_storage).~WaitableObjectList();
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}
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void Event::Signal() {
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std::scoped_lock lk(this->lock);
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/* If we're already signaled, nothing more to do. */
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if (this->signaled) {
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return;
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}
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this->signaled = true;
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/* Signal! */
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if (this->auto_clear) {
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/* If we're auto clear, signal one thread, which will clear. */
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this->cv.Signal();
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} else {
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/* If we're manual clear, increment counter and wake all. */
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this->counter++;
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this->cv.Broadcast();
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}
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/* Wake up whatever manager, if any. */
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GetReference(this->waitable_object_list_storage).SignalAllThreads();
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}
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void Event::Reset() {
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std::scoped_lock lk(this->lock);
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this->signaled = false;
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}
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void Event::Wait() {
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std::scoped_lock lk(this->lock);
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u64 cur_counter = this->counter;
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while (!this->signaled) {
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if (this->counter != cur_counter) {
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break;
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}
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this->cv.Wait(&this->lock);
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}
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if (this->auto_clear) {
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this->signaled = false;
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}
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}
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bool Event::TryWait() {
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std::scoped_lock lk(this->lock);
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const bool success = this->signaled;
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if (this->auto_clear) {
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this->signaled = false;
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}
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return success;
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}
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bool Event::TimedWait(u64 ns) {
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TimeoutHelper timeout_helper(ns);
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std::scoped_lock lk(this->lock);
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u64 cur_counter = this->counter;
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while (!this->signaled) {
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if (this->counter != cur_counter) {
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break;
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}
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if (this->cv.TimedWait(&this->lock, timeout_helper.NsUntilTimeout()) == ConditionVariableStatus::TimedOut) {
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return false;
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}
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}
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if (this->auto_clear) {
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this->signaled = false;
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}
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return true;
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}
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}
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