fdf882ded2
Summary: When dynamically linking two binaries together, different builds of RocksDB from two sources might cause errors. To provide a tool for user to solve the problem, the RocksDB namespace is changed to a flag which can be overridden in build time. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6433 Test Plan: Build release, all and jtest. Try to build with ROCKSDB_NAMESPACE with another flag. Differential Revision: D19977691 fbshipit-source-id: aa7f2d0972e1c31d75339ac48478f34f6cfcfb3e
68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
// 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_NAMESPACE {
|
|
|
|
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_NAMESPACE
|