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SwappableEventBase.cpp
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78 lines (62 loc) · 2.17 KB
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// Copyright (c) Facebook, Inc. and its affiliates.
//
// 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 "SwappableEventBase.h"
namespace rsocket {
bool SwappableEventBase::runInEventBaseThread(CbFunc cb) {
const std::lock_guard<std::mutex> l(hasSebDtored_->l_);
if (this->isSwapping()) {
queued_.push_back(std::move(cb));
return false;
}
eb_->runInEventBaseThread(
[eb = eb_, cb_ = std::move(cb)]() mutable { return cb_(*eb); });
return true;
}
void SwappableEventBase::setEventBase(folly::EventBase& newEb) {
const std::lock_guard<std::mutex> l(hasSebDtored_->l_);
auto const alreadySwapping = this->isSwapping();
nextEb_ = &newEb;
if (alreadySwapping) {
return;
}
eb_->runInEventBaseThread([this, hasSebDtored = hasSebDtored_]() {
const std::lock_guard<std::mutex> lInner(hasSebDtored->l_);
if (hasSebDtored->destroyed_) {
// SEB was destroyed, any queued callbacks were appended to the old eb_
return;
}
eb_ = nextEb_;
nextEb_ = nullptr;
// enqueue tasks that were being buffered while this was waiting
// for the previous EB to drain
for (auto& cb : queued_) {
eb_->runInEventBaseThread(
[cb = std::move(cb), eb = eb_]() mutable { return cb(*eb); });
}
queued_.clear();
});
}
bool SwappableEventBase::isSwapping() const {
return nextEb_ != nullptr;
}
SwappableEventBase::~SwappableEventBase() {
const std::lock_guard<std::mutex> l(hasSebDtored_->l_);
hasSebDtored_->destroyed_ = true;
for (auto& cb : queued_) {
eb_->runInEventBaseThread(
[cb = std::move(cb), eb = eb_]() mutable { return cb(*eb); });
}
queued_.clear();
}
} /* namespace rsocket */