98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
/*
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* Copyright (C) 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "host/commands/cvd/epoll_loop.h"
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#include <android-base/errors.h>
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#include "common/libs/fs/epoll.h"
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#include "common/libs/fs/shared_fd.h"
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#include "common/libs/utils/result.h"
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namespace cuttlefish {
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EpollPool::EpollPool(Epoll epoll) : epoll_(std::move(epoll)) {}
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EpollPool::EpollPool(EpollPool&& other) {
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std::unique_lock own_lock(instance_mutex_, std::defer_lock);
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std::unique_lock other_lock(other.instance_mutex_, std::defer_lock);
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std::unique_lock own_cb_lock(callbacks_mutex_, std::defer_lock);
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std::unique_lock other_cb_lock(other.callbacks_mutex_, std::defer_lock);
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std::lock(own_lock, other_lock, own_cb_lock, other_cb_lock);
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epoll_ = std::move(other.epoll_);
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callbacks_ = std::move(other.callbacks_);
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}
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EpollPool& EpollPool::operator=(EpollPool&& other) {
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std::unique_lock own_lock(instance_mutex_, std::defer_lock);
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std::unique_lock other_lock(other.instance_mutex_, std::defer_lock);
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std::unique_lock own_cb_lock(callbacks_mutex_, std::defer_lock);
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std::unique_lock other_cb_lock(other.callbacks_mutex_, std::defer_lock);
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std::lock(own_lock, other_lock, own_cb_lock, other_cb_lock);
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epoll_ = std::move(other.epoll_);
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callbacks_ = std::move(other.callbacks_);
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return *this;
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}
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Result<void> EpollPool::Register(SharedFD fd, uint32_t events,
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EpollCallback callback) {
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std::shared_lock instance_lock(instance_mutex_, std::defer_lock);
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std::unique_lock callbacks_lock(callbacks_mutex_, std::defer_lock);
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std::lock(instance_lock, callbacks_lock);
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if (callbacks_.find(fd) != callbacks_.end()) {
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return CF_ERR("Already have a callback created");
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}
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CF_EXPECT(epoll_.AddOrModify(fd, events | EPOLLONESHOT));
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callbacks_[fd] = std::move(callback);
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return {};
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}
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Result<void> EpollPool::HandleEvent() {
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auto event = CF_EXPECT(epoll_.Wait());
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if (!event) {
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return {};
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}
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EpollCallback callback;
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{
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std::lock_guard lock(callbacks_mutex_);
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auto it = callbacks_.find(event->fd);
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CF_EXPECT(it != callbacks_.end(), "Could not find event callback");
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callback = std::move(it->second);
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callbacks_.erase(it);
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}
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CF_EXPECT(callback(*event));
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return {};
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}
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Result<void> EpollPool::Remove(SharedFD fd) {
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std::shared_lock instance_lock(instance_mutex_, std::defer_lock);
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std::unique_lock callbacks_lock(callbacks_mutex_, std::defer_lock);
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std::lock(instance_lock, callbacks_lock);
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CF_EXPECT(epoll_.Delete(fd), "No callback registered with epoll");
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callbacks_.erase(fd);
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return {};
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}
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fruit::Component<EpollPool> EpollLoopComponent() {
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return fruit::createComponent()
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.registerProvider([]() -> EpollPool {
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return EpollPool(OR_FATAL(Epoll::Create()));
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});
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}
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} // namespace cuttlefish
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