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84eef260de
Summary: Rare TSAN and valgrind failures are caused by unnecessary reading of a field on the TaskLimiterToken::limiter_ for an assertion after the token has been released and the limiter destroyed. To simplify we can simply destroy the token before triggering DB shutdown (potentially destroying the limiter). This makes the ReleaseOnce logic unnecessary. Pull Request resolved: https://github.com/facebook/rocksdb/pull/8567 Test Plan: watch for more failures in CI Reviewed By: ajkr Differential Revision: D29811795 Pulled By: pdillinger fbshipit-source-id: 135549ebb98fe4f176d1542ed85d5bd6350a40b3
68 lines
2.2 KiB
C++
68 lines
2.2 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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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "util/concurrent_task_limiter_impl.h"
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#include "rocksdb/concurrent_task_limiter.h"
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namespace ROCKSDB_NAMESPACE {
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ConcurrentTaskLimiterImpl::ConcurrentTaskLimiterImpl(
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const std::string& name, int32_t max_outstanding_task)
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: name_(name),
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max_outstanding_tasks_{max_outstanding_task},
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outstanding_tasks_{0} {
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}
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ConcurrentTaskLimiterImpl::~ConcurrentTaskLimiterImpl() {
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assert(outstanding_tasks_ == 0);
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}
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const std::string& ConcurrentTaskLimiterImpl::GetName() const {
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return name_;
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}
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void ConcurrentTaskLimiterImpl::SetMaxOutstandingTask(int32_t limit) {
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max_outstanding_tasks_.store(limit, std::memory_order_relaxed);
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}
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void ConcurrentTaskLimiterImpl::ResetMaxOutstandingTask() {
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max_outstanding_tasks_.store(-1, std::memory_order_relaxed);
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}
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int32_t ConcurrentTaskLimiterImpl::GetOutstandingTask() const {
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return outstanding_tasks_.load(std::memory_order_relaxed);
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}
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std::unique_ptr<TaskLimiterToken> ConcurrentTaskLimiterImpl::GetToken(
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bool force) {
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int32_t limit = max_outstanding_tasks_.load(std::memory_order_relaxed);
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int32_t tasks = outstanding_tasks_.load(std::memory_order_relaxed);
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// force = true, bypass the throttle.
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// limit < 0 means unlimited tasks.
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while (force || limit < 0 || tasks < limit) {
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if (outstanding_tasks_.compare_exchange_weak(tasks, tasks + 1)) {
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return std::unique_ptr<TaskLimiterToken>(new TaskLimiterToken(this));
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}
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}
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return nullptr;
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}
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ConcurrentTaskLimiter* NewConcurrentTaskLimiter(
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const std::string& name, int32_t limit) {
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return new ConcurrentTaskLimiterImpl(name, limit);
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}
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TaskLimiterToken::~TaskLimiterToken() {
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--limiter_->outstanding_tasks_;
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assert(limiter_->outstanding_tasks_ >= 0);
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}
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} // namespace ROCKSDB_NAMESPACE
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