87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
|
/*
|
||
|
|
* Copyright 2018-present Facebook, Inc.
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#include <folly/DefaultKeepAliveExecutor.h>
|
||
|
|
|
||
|
|
namespace folly {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* VirtualExecutor implements a light-weight view onto existing Executor.
|
||
|
|
*
|
||
|
|
* Multiple VirtualExecutors can be backed by a single Executor.
|
||
|
|
*
|
||
|
|
* VirtualExecutor's destructor blocks until all tasks scheduled through it are
|
||
|
|
* complete. Executor's destructor also blocks until all VirtualExecutors
|
||
|
|
* backed by it are released.
|
||
|
|
*/
|
||
|
|
class VirtualExecutor : public DefaultKeepAliveExecutor {
|
||
|
|
auto wrapFunc(Func f) {
|
||
|
|
class FuncAndKeepAlive {
|
||
|
|
public:
|
||
|
|
FuncAndKeepAlive(Func&& f, VirtualExecutor* executor)
|
||
|
|
: keepAlive_(getKeepAliveToken(executor)), f_(std::move(f)) {}
|
||
|
|
|
||
|
|
void operator()() {
|
||
|
|
f_();
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
Executor::KeepAlive<VirtualExecutor> keepAlive_;
|
||
|
|
Func f_;
|
||
|
|
};
|
||
|
|
|
||
|
|
return FuncAndKeepAlive(std::move(f), this);
|
||
|
|
}
|
||
|
|
|
||
|
|
public:
|
||
|
|
explicit VirtualExecutor(KeepAlive<> executor)
|
||
|
|
: executor_(std::move(executor)) {
|
||
|
|
assert(!isKeepAliveDummy(executor_));
|
||
|
|
}
|
||
|
|
|
||
|
|
explicit VirtualExecutor(Executor* executor)
|
||
|
|
: VirtualExecutor(getKeepAliveToken(executor)) {}
|
||
|
|
|
||
|
|
explicit VirtualExecutor(Executor& executor)
|
||
|
|
: VirtualExecutor(getKeepAliveToken(executor)) {}
|
||
|
|
|
||
|
|
VirtualExecutor(const VirtualExecutor&) = delete;
|
||
|
|
VirtualExecutor& operator=(const VirtualExecutor&) = delete;
|
||
|
|
|
||
|
|
uint8_t getNumPriorities() const override {
|
||
|
|
return executor_->getNumPriorities();
|
||
|
|
}
|
||
|
|
|
||
|
|
void add(Func f) override {
|
||
|
|
executor_->add(wrapFunc(std::move(f)));
|
||
|
|
}
|
||
|
|
|
||
|
|
void addWithPriority(Func f, int8_t priority) override {
|
||
|
|
executor_->addWithPriority(wrapFunc(std::move(f)), priority);
|
||
|
|
}
|
||
|
|
|
||
|
|
~VirtualExecutor() override {
|
||
|
|
joinKeepAlive();
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
const KeepAlive<> executor_;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace folly
|