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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 "monitoring/instrumented_mutex.h"
#include "monitoring/perf_context_imp.h"
#include "monitoring/thread_status_util.h"
#include "rocksdb/system_clock.h"
#include "test_util/sync_point.h"
namespace ROCKSDB_NAMESPACE {
namespace {
#ifndef NPERF_CONTEXT
Statistics* stats_for_report(SystemClock* clock, Statistics* stats) {
if (clock != nullptr && stats != nullptr &&
stats->get_stats_level() > kExceptTimeForMutex) {
return stats;
} else {
return nullptr;
}
}
#endif // NPERF_CONTEXT
} // namespace
void InstrumentedMutex::Lock() {
PERF_CONDITIONAL_TIMER_FOR_MUTEX_GUARD(
db_mutex_lock_nanos, stats_code_ == DB_MUTEX_WAIT_MICROS,
stats_for_report(clock_, stats_), stats_code_);
LockInternal();
}
void InstrumentedMutex::LockInternal() {
#ifndef NDEBUG
ThreadStatusUtil::TEST_StateDelay(ThreadStatus::STATE_MUTEX_WAIT);
#endif
#ifdef COERCE_CONTEXT_SWITCH
if (stats_code_ == DB_MUTEX_WAIT_MICROS) {
thread_local Random rnd(301);
if (rnd.OneIn(2)) {
if (bg_cv_) {
bg_cv_->SignalAll();
}
sched_yield();
} else {
uint32_t sleep_us = rnd.Uniform(11) * 1000;
if (bg_cv_) {
bg_cv_->SignalAll();
}
SystemClock::Default()->SleepForMicroseconds(sleep_us);
}
}
#endif
mutex_.Lock();
}
void InstrumentedCondVar::Wait() {
PERF_CONDITIONAL_TIMER_FOR_MUTEX_GUARD(
db_condition_wait_nanos, stats_code_ == DB_MUTEX_WAIT_MICROS,
stats_for_report(clock_, stats_), stats_code_);
WaitInternal();
}
void InstrumentedCondVar::WaitInternal() {
#ifndef NDEBUG
ThreadStatusUtil::TEST_StateDelay(ThreadStatus::STATE_MUTEX_WAIT);
#endif
cond_.Wait();
}
bool InstrumentedCondVar::TimedWait(uint64_t abs_time_us) {
PERF_CONDITIONAL_TIMER_FOR_MUTEX_GUARD(
db_condition_wait_nanos, stats_code_ == DB_MUTEX_WAIT_MICROS,
stats_for_report(clock_, stats_), stats_code_);
return TimedWaitInternal(abs_time_us);
}
bool InstrumentedCondVar::TimedWaitInternal(uint64_t abs_time_us) {
#ifndef NDEBUG
ThreadStatusUtil::TEST_StateDelay(ThreadStatus::STATE_MUTEX_WAIT);
#endif
TEST_SYNC_POINT_CALLBACK("InstrumentedCondVar::TimedWaitInternal",
&abs_time_us);
return cond_.TimedWait(abs_time_us);
}
} // namespace ROCKSDB_NAMESPACE
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