mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-27 11:43:49 +00:00
a69bc91e37
Summary: Add a new field: BackupableDBOptions.max_background_copies. CreateNewBackup() and RestoreDBFromBackup() will use this number of threads to perform copies. If there is a backup rate limit, then max_background_copies must be 1. Update backupable_db_test.cc to test multi-threaded backup and restore. Update backupable_db_test.cc to test backups when the backup environment is not the same as the database environment. Test Plan: Run ./backupable_db_test Run valgrind ./backupable_db_test Run with TSAN and ASAN Reviewers: yhchiang, rven, anthony, sdong, igor Reviewed By: igor Subscribers: yhchiang, anthony, sdong, leveldb, dhruba Differential Revision: https://reviews.facebook.net/D40725
68 lines
1.5 KiB
C++
68 lines
1.5 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under the BSD-style license found in the
|
|
// LICENSE file in the root directory of this source tree. An additional grant
|
|
// of patent rights can be found in the PATENTS file in the same directory.
|
|
|
|
#include <condition_variable>
|
|
#include <mutex>
|
|
#include <queue>
|
|
#include <utility>
|
|
|
|
#pragma once
|
|
|
|
namespace rocksdb {
|
|
|
|
template <class T>
|
|
class channel {
|
|
public:
|
|
explicit channel() : eof_(false) {}
|
|
|
|
channel(const channel&) = delete;
|
|
void operator=(const channel&) = delete;
|
|
|
|
void sendEof() {
|
|
std::lock_guard<std::mutex> lk(lock_);
|
|
eof_ = true;
|
|
cv_.notify_all();
|
|
}
|
|
|
|
bool eof() {
|
|
std::lock_guard<std::mutex> lk(lock_);
|
|
return buffer_.empty() && eof_;
|
|
}
|
|
|
|
size_t size() const {
|
|
std::lock_guard<std::mutex> lk(lock_);
|
|
return buffer_.size();
|
|
}
|
|
|
|
// writes elem to the queue
|
|
void write(T&& elem) {
|
|
std::unique_lock<std::mutex> lk(lock_);
|
|
buffer_.emplace(std::forward<T>(elem));
|
|
cv_.notify_one();
|
|
}
|
|
|
|
/// Moves a dequeued element onto elem, blocking until an element
|
|
/// is available.
|
|
// returns false if EOF
|
|
bool read(T& elem) {
|
|
std::unique_lock<std::mutex> lk(lock_);
|
|
cv_.wait(lk, [&] { return eof_ || !buffer_.empty(); });
|
|
if (eof_ && buffer_.empty()) {
|
|
return false;
|
|
}
|
|
elem = std::move(buffer_.front());
|
|
buffer_.pop();
|
|
cv_.notify_one();
|
|
return true;
|
|
}
|
|
|
|
private:
|
|
std::condition_variable cv_;
|
|
std::mutex lock_;
|
|
std::queue<T> buffer_;
|
|
bool eof_;
|
|
};
|
|
} // namespace rocksdb
|