84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
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/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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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 <folly/io/async/VirtualEventBase.h>
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namespace folly {
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VirtualEventBase::VirtualEventBase(EventBase& evb)
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: evb_(getKeepAliveToken(evb)) {}
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std::future<void> VirtualEventBase::destroy() {
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evb_->runInEventBaseThread([this] { loopKeepAlive_.reset(); });
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return std::move(destroyFuture_);
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}
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void VirtualEventBase::destroyImpl() {
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try {
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{
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// After destroyPromise_ is posted this object may be destroyed, so make
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// sure we release EventBase's keep-alive token before that.
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SCOPE_EXIT {
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evb_.reset();
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};
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clearCobTimeouts();
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while (!onDestructionCallbacks_.rlock()->empty()) {
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// To avoid potential deadlock, do not hold the mutex while invoking
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// user-supplied callbacks.
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EventBase::OnDestructionCallback::List callbacks;
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onDestructionCallbacks_.swap(callbacks);
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while (!callbacks.empty()) {
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auto& callback = callbacks.front();
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callbacks.pop_front();
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callback.runCallback();
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}
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}
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}
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destroyPromise_.set_value();
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} catch (...) {
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destroyPromise_.set_exception(std::current_exception());
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}
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}
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VirtualEventBase::~VirtualEventBase() {
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if (!destroyFuture_.valid()) {
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return;
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}
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CHECK(!evb_->inRunningEventBaseThread());
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destroy().get();
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}
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void VirtualEventBase::runOnDestruction(
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EventBase::OnDestructionCallback& callback) {
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callback.schedule(
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[this](auto& cb) { onDestructionCallbacks_.wlock()->push_back(cb); },
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[this](auto& cb) {
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onDestructionCallbacks_.withWLock(
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[&](auto& list) { list.erase(list.iterator_to(cb)); });
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});
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}
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void VirtualEventBase::runOnDestruction(Func f) {
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auto* callback = new EventBase::FunctionOnDestructionCallback(std::move(f));
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runOnDestruction(*callback);
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}
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} // namespace folly
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