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112 lines
2.8 KiB
112 lines
2.8 KiB
/*
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* Copyright 2019 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 "os/handler.h"
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#include <sys/eventfd.h>
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#include <unistd.h>
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#include <cstring>
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#include "common/bind.h"
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#include "common/callback.h"
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#include "os/log.h"
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#include "os/reactor.h"
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#include "os/utils.h"
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#ifndef EFD_SEMAPHORE
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#define EFD_SEMAPHORE 1
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#endif
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namespace bluetooth {
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namespace os {
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using common::OnceClosure;
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Handler::Handler(Thread* thread)
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: tasks_(new std::queue<OnceClosure>()), thread_(thread), fd_(eventfd(0, EFD_SEMAPHORE | EFD_NONBLOCK)) {
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ASSERT(fd_ != -1);
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reactable_ = thread_->GetReactor()->Register(
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fd_, common::Bind(&Handler::handle_next_event, common::Unretained(this)), common::Closure());
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}
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Handler::~Handler() {
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{
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std::lock_guard<std::mutex> lock(mutex_);
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ASSERT_LOG(was_cleared(), "Handlers must be cleared before they are destroyed");
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}
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int close_status;
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RUN_NO_INTR(close_status = close(fd_));
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ASSERT(close_status != -1);
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}
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void Handler::Post(OnceClosure closure) {
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{
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std::lock_guard<std::mutex> lock(mutex_);
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if (was_cleared()) {
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LOG_WARN("Posting to a handler which has been cleared");
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return;
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}
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tasks_->emplace(std::move(closure));
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}
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uint64_t val = 1;
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auto write_result = eventfd_write(fd_, val);
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ASSERT(write_result != -1);
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}
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void Handler::Clear() {
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std::queue<OnceClosure>* tmp = nullptr;
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{
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std::lock_guard<std::mutex> lock(mutex_);
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ASSERT_LOG(!was_cleared(), "Handlers must only be cleared once");
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std::swap(tasks_, tmp);
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}
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delete tmp;
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uint64_t val;
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while (eventfd_read(fd_, &val) == 0) {
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}
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thread_->GetReactor()->Unregister(reactable_);
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reactable_ = nullptr;
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}
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void Handler::WaitUntilStopped(std::chrono::milliseconds timeout) {
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ASSERT(reactable_ == nullptr);
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ASSERT(thread_->GetReactor()->WaitForUnregisteredReactable(timeout));
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}
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void Handler::handle_next_event() {
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common::OnceClosure closure;
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{
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std::lock_guard<std::mutex> lock(mutex_);
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uint64_t val = 0;
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auto read_result = eventfd_read(fd_, &val);
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if (was_cleared()) {
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return;
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}
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ASSERT_LOG(read_result != -1, "eventfd read error %d %s", errno, strerror(errno));
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closure = std::move(tasks_->front());
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tasks_->pop();
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}
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std::move(closure).Run();
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}
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} // namespace os
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} // namespace bluetooth
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