mirror of https://github.com/facebook/rocksdb.git
60 lines
1.4 KiB
C++
60 lines
1.4 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include "db/trim_history_scheduler.h"
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#include <cassert>
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#include "db/column_family.h"
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namespace rocksdb {
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void TrimHistoryScheduler::ScheduleWork(ColumnFamilyData* cfd) {
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std::lock_guard<std::mutex> lock(checking_mutex_);
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cfd->Ref();
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cfds_.push_back(cfd);
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is_empty_.store(false, std::memory_order_relaxed);
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}
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ColumnFamilyData* TrimHistoryScheduler::TakeNextColumnFamily() {
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std::lock_guard<std::mutex> lock(checking_mutex_);
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while (true) {
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if (cfds_.empty()) {
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return nullptr;
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}
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ColumnFamilyData* cfd = cfds_.back();
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cfds_.pop_back();
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if (cfds_.empty()) {
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is_empty_.store(true, std::memory_order_relaxed);
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}
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if (!cfd->IsDropped()) {
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// success
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return cfd;
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}
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if (cfd->Unref()) {
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// no longer relevant, retry
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delete cfd;
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}
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}
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}
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bool TrimHistoryScheduler::Empty() {
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bool is_empty = is_empty_.load(std::memory_order_relaxed);
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return is_empty;
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}
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void TrimHistoryScheduler::Clear() {
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ColumnFamilyData* cfd;
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while ((cfd = TakeNextColumnFamily()) != nullptr) {
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if (cfd->Unref()) {
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delete cfd;
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}
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}
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assert(Empty());
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}
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} // namespace rocksdb
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