Revision e336d97f6365b5ea7f0032861d943cf08fe92d9a authored by Adam Retter on 10 May 2017, 15:54:46 UTC, committed by Sagar Vemuri on 15 May 2017, 22:44:19 UTC
Summary: Updates to CentOS 5 have been archived as CentOS 5 is EOL. We now pull the updates from the vault. This is a stop gap solution, I will send a PR in a couple days which uses fixed Docker containers (with the updates pre-installed) instead. sagar0 Here you go :-) Closes https://github.com/facebook/rocksdb/pull/2270 Differential Revision: D5033637 Pulled By: sagar0 fbshipit-source-id: a9312dd1bc18bfb8653f06ffa0a1512b4415720d
1 parent a0c4361
flush_scheduler.cc
// Copyright (c) 2011-present, 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 "db/flush_scheduler.h"
#include <cassert>
#include "db/column_family.h"
namespace rocksdb {
void FlushScheduler::ScheduleFlush(ColumnFamilyData* cfd) {
#ifndef NDEBUG
{
std::lock_guard<std::mutex> lock(checking_mutex_);
assert(checking_set_.count(cfd) == 0);
checking_set_.insert(cfd);
}
#endif // NDEBUG
cfd->Ref();
// Suppress false positive clang analyzer warnings.
#ifndef __clang_analyzer__
Node* node = new Node{cfd, head_.load(std::memory_order_relaxed)};
while (!head_.compare_exchange_strong(
node->next, node, std::memory_order_relaxed, std::memory_order_relaxed)) {
// failing CAS updates the first param, so we are already set for
// retry. TakeNextColumnFamily won't happen until after another
// inter-thread synchronization, so we don't even need release
// semantics for this CAS
}
#endif // __clang_analyzer__
}
ColumnFamilyData* FlushScheduler::TakeNextColumnFamily() {
while (true) {
if (Empty()) {
return nullptr;
}
// dequeue the head
Node* node = head_.load(std::memory_order_relaxed);
head_.store(node->next, std::memory_order_relaxed);
ColumnFamilyData* cfd = node->column_family;
delete node;
#ifndef NDEBUG
{
auto iter = checking_set_.find(cfd);
assert(iter != checking_set_.end());
checking_set_.erase(iter);
}
#endif // NDEBUG
if (!cfd->IsDropped()) {
// success
return cfd;
}
// no longer relevant, retry
if (cfd->Unref()) {
delete cfd;
}
}
}
bool FlushScheduler::Empty() {
auto rv = head_.load(std::memory_order_relaxed) == nullptr;
assert(rv == checking_set_.empty());
return rv;
}
void FlushScheduler::Clear() {
ColumnFamilyData* cfd;
while ((cfd = TakeNextColumnFamily()) != nullptr) {
if (cfd->Unref()) {
delete cfd;
}
}
assert(Empty());
}
} // namespace rocksdb
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