61876614dc
Summary: - Provide assignment operator in CompactionStats - Provide a copy constructor for FileDescriptor - Remove std::move from "return std::move(t)" in BoundedQueue Pull Request resolved: https://github.com/facebook/rocksdb/pull/5553 Differential Revision: D16230170 fbshipit-source-id: fd7c6e52390b2db1be24141e25649cf62424d078
68 lines
1.4 KiB
C++
68 lines
1.4 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under both the GPLv2 (found in the
|
|
// COPYING file in the root directory) and Apache 2.0 License
|
|
// (found in the LICENSE.Apache file in the root directory).
|
|
#pragma once
|
|
|
|
#include <limits>
|
|
#include <list>
|
|
|
|
#include "util/mutexlock.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
//
|
|
// Simple synchronized queue implementation with the option of
|
|
// bounding the queue
|
|
//
|
|
// On overflow, the elements will be discarded
|
|
//
|
|
template <class T>
|
|
class BoundedQueue {
|
|
public:
|
|
explicit BoundedQueue(
|
|
const size_t max_size = std::numeric_limits<size_t>::max())
|
|
: cond_empty_(&lock_), max_size_(max_size) {}
|
|
|
|
virtual ~BoundedQueue() {}
|
|
|
|
void Push(T&& t) {
|
|
MutexLock _(&lock_);
|
|
if (max_size_ != std::numeric_limits<size_t>::max() &&
|
|
size_ + t.Size() >= max_size_) {
|
|
// overflow
|
|
return;
|
|
}
|
|
|
|
size_ += t.Size();
|
|
q_.push_back(std::move(t));
|
|
cond_empty_.SignalAll();
|
|
}
|
|
|
|
T Pop() {
|
|
MutexLock _(&lock_);
|
|
while (q_.empty()) {
|
|
cond_empty_.Wait();
|
|
}
|
|
|
|
T t = std::move(q_.front());
|
|
size_ -= t.Size();
|
|
q_.pop_front();
|
|
return t;
|
|
}
|
|
|
|
size_t Size() const {
|
|
MutexLock _(&lock_);
|
|
return size_;
|
|
}
|
|
|
|
private:
|
|
mutable port::Mutex lock_;
|
|
port::CondVar cond_empty_;
|
|
std::list<T> q_;
|
|
size_t size_ = 0;
|
|
const size_t max_size_;
|
|
};
|
|
|
|
} // namespace rocksdb
|