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// 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).
//
#include "db/logs_with_prep_tracker.h"
#include "port/likely.h"
namespace ROCKSDB_NAMESPACE {
void LogsWithPrepTracker::MarkLogAsHavingPrepSectionFlushed(uint64_t log) {
assert(log != 0);
std::lock_guard<std::mutex> lock(prepared_section_completed_mutex_);
auto it = prepared_section_completed_.find(log);
if (UNLIKELY(it == prepared_section_completed_.end())) {
prepared_section_completed_[log] = 1;
} else {
it->second += 1;
}
}
void LogsWithPrepTracker::MarkLogAsContainingPrepSection(uint64_t log) {
assert(log != 0);
std::lock_guard<std::mutex> lock(logs_with_prep_mutex_);
auto rit = logs_with_prep_.rbegin();
bool updated = false;
// Most probably the last log is the one that is being marked for
// having a prepare section; so search from the end.
for (; rit != logs_with_prep_.rend() && rit->log >= log; ++rit) {
if (rit->log == log) {
rit->cnt++;
updated = true;
break;
}
}
if (!updated) {
// We are either at the start, or at a position with rit->log < log
logs_with_prep_.insert(rit.base(), {log, 1});
}
}
uint64_t LogsWithPrepTracker::FindMinLogContainingOutstandingPrep() {
std::lock_guard<std::mutex> lock(logs_with_prep_mutex_);
auto it = logs_with_prep_.begin();
// start with the smallest log
for (; it != logs_with_prep_.end();) {
auto min_log = it->log;
{
std::lock_guard<std::mutex> lock2(prepared_section_completed_mutex_);
auto completed_it = prepared_section_completed_.find(min_log);
if (completed_it == prepared_section_completed_.end() ||
completed_it->second < it->cnt) {
return min_log;
}
assert(completed_it != prepared_section_completed_.end() &&
completed_it->second == it->cnt);
prepared_section_completed_.erase(completed_it);
}
// erase from beginning in vector is not efficient but this function is not
// on the fast path.
it = logs_with_prep_.erase(it);
}
// no such log found
return 0;
}
} // namespace ROCKSDB_NAMESPACE
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