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/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "os/handler.h"
#include <cstring>
#include "common/bind.h"
#include "common/callback.h"
#include "os/log.h"
#include "os/reactor.h"
#include "os/utils.h"
namespace bluetooth {
namespace os {
using common::OnceClosure;
Handler::Handler(Thread* thread) : tasks_(new std::queue<OnceClosure>()), thread_(thread) {
event_ = thread_->GetReactor()->NewEvent();
reactable_ = thread_->GetReactor()->Register(
event_->Id(), common::Bind(&Handler::handle_next_event, common::Unretained(this)), common::Closure());
}
Handler::~Handler() {
{
std::lock_guard<std::mutex> lock(mutex_);
ASSERT_LOG(was_cleared(), "Handlers must be cleared before they are destroyed");
}
event_->Close();
}
void Handler::Post(OnceClosure closure) {
{
std::lock_guard<std::mutex> lock(mutex_);
if (was_cleared()) {
LOG_WARN("Posting to a handler which has been cleared");
return;
}
tasks_->emplace(std::move(closure));
}
event_->Notify();
}
void Handler::Clear() {
std::queue<OnceClosure>* tmp = nullptr;
{
std::lock_guard<std::mutex> lock(mutex_);
ASSERT_LOG(!was_cleared(), "Handlers must only be cleared once");
std::swap(tasks_, tmp);
}
delete tmp;
event_->Clear();
thread_->GetReactor()->Unregister(reactable_);
reactable_ = nullptr;
}
void Handler::WaitUntilStopped(std::chrono::milliseconds timeout) {
ASSERT(reactable_ == nullptr);
ASSERT(thread_->GetReactor()->WaitForUnregisteredReactable(timeout));
}
void Handler::handle_next_event() {
common::OnceClosure closure;
{
std::lock_guard<std::mutex> lock(mutex_);
bool has_data = event_->Read();
if (was_cleared()) {
return;
}
ASSERT_LOG(has_data, "Notified for work but no work available");
closure = std::move(tasks_->front());
tasks_->pop();
}
std::move(closure).Run();
}
} // namespace os
} // namespace bluetooth
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