Revision 6d58ea901d64626745b96cc9ac072b5c1c5c8be4 authored by Adam Retter on 27 November 2019, 00:55:46 UTC, committed by Facebook Github Bot on 27 November 2019, 02:24:09 UTC
Summary: **NOTE**: this also needs to be back-ported to 6.4.6 and possibly older branches if further releases from them is envisaged. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6081 Differential Revision: D18710107 Pulled By: zhichao-cao fbshipit-source-id: 03260f9316566e2bfc12c7d702d6338bb7941e01
1 parent 8ae149e
concurrent_task_limiter_impl.cc
// Copyright (c) 2011-present, 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).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include "util/concurrent_task_limiter_impl.h"
#include "rocksdb/concurrent_task_limiter.h"
namespace rocksdb {
ConcurrentTaskLimiterImpl::ConcurrentTaskLimiterImpl(
const std::string& name, int32_t max_outstanding_task)
: name_(name),
max_outstanding_tasks_{max_outstanding_task},
outstanding_tasks_{0} {
}
ConcurrentTaskLimiterImpl::~ConcurrentTaskLimiterImpl() {
assert(outstanding_tasks_ == 0);
}
const std::string& ConcurrentTaskLimiterImpl::GetName() const {
return name_;
}
void ConcurrentTaskLimiterImpl::SetMaxOutstandingTask(int32_t limit) {
max_outstanding_tasks_.store(limit, std::memory_order_relaxed);
}
void ConcurrentTaskLimiterImpl::ResetMaxOutstandingTask() {
max_outstanding_tasks_.store(-1, std::memory_order_relaxed);
}
int32_t ConcurrentTaskLimiterImpl::GetOutstandingTask() const {
return outstanding_tasks_.load(std::memory_order_relaxed);
}
std::unique_ptr<TaskLimiterToken> ConcurrentTaskLimiterImpl::GetToken(
bool force) {
int32_t limit = max_outstanding_tasks_.load(std::memory_order_relaxed);
int32_t tasks = outstanding_tasks_.load(std::memory_order_relaxed);
// force = true, bypass the throttle.
// limit < 0 means unlimited tasks.
while (force || limit < 0 || tasks < limit) {
if (outstanding_tasks_.compare_exchange_weak(tasks, tasks + 1)) {
return std::unique_ptr<TaskLimiterToken>(new TaskLimiterToken(this));
}
}
return nullptr;
}
ConcurrentTaskLimiter* NewConcurrentTaskLimiter(
const std::string& name, int32_t limit) {
return new ConcurrentTaskLimiterImpl(name, limit);
}
TaskLimiterToken::~TaskLimiterToken() {
--limiter_->outstanding_tasks_;
assert(limiter_->outstanding_tasks_ >= 0);
}
} // namespace rocksdb
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...