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90 lines
2.5 KiB
90 lines
2.5 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include "monitoring/instrumented_mutex.h"
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#include "monitoring/perf_context_imp.h"
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#include "monitoring/thread_status_util.h"
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#include "rocksdb/system_clock.h"
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#include "test_util/sync_point.h"
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namespace ROCKSDB_NAMESPACE {
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namespace {
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#ifndef NPERF_CONTEXT
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Statistics* stats_for_report(SystemClock* clock, Statistics* stats) {
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if (clock != nullptr && stats != nullptr &&
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stats->get_stats_level() > kExceptTimeForMutex) {
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return stats;
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} else {
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return nullptr;
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}
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}
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#endif // NPERF_CONTEXT
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} // namespace
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void InstrumentedMutex::Lock() {
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PERF_CONDITIONAL_TIMER_FOR_MUTEX_GUARD(
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db_mutex_lock_nanos, stats_code_ == DB_MUTEX_WAIT_MICROS,
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stats_for_report(clock_, stats_), stats_code_);
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LockInternal();
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}
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void InstrumentedMutex::LockInternal() {
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#ifndef NDEBUG
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ThreadStatusUtil::TEST_StateDelay(ThreadStatus::STATE_MUTEX_WAIT);
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#endif
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#ifdef COERCE_CONTEXT_SWITCH
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if (stats_code_ == DB_MUTEX_WAIT_MICROS) {
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thread_local Random rnd(301);
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if (rnd.OneIn(2)) {
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if (bg_cv_) {
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bg_cv_->SignalAll();
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}
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sched_yield();
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} else {
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uint32_t sleep_us = rnd.Uniform(11) * 1000;
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if (bg_cv_) {
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bg_cv_->SignalAll();
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}
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SystemClock::Default()->SleepForMicroseconds(sleep_us);
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}
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}
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#endif
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mutex_.Lock();
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}
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void InstrumentedCondVar::Wait() {
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PERF_CONDITIONAL_TIMER_FOR_MUTEX_GUARD(
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db_condition_wait_nanos, stats_code_ == DB_MUTEX_WAIT_MICROS,
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stats_for_report(clock_, stats_), stats_code_);
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WaitInternal();
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}
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void InstrumentedCondVar::WaitInternal() {
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#ifndef NDEBUG
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ThreadStatusUtil::TEST_StateDelay(ThreadStatus::STATE_MUTEX_WAIT);
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#endif
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cond_.Wait();
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}
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bool InstrumentedCondVar::TimedWait(uint64_t abs_time_us) {
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PERF_CONDITIONAL_TIMER_FOR_MUTEX_GUARD(
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db_condition_wait_nanos, stats_code_ == DB_MUTEX_WAIT_MICROS,
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stats_for_report(clock_, stats_), stats_code_);
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return TimedWaitInternal(abs_time_us);
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}
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bool InstrumentedCondVar::TimedWaitInternal(uint64_t abs_time_us) {
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#ifndef NDEBUG
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ThreadStatusUtil::TEST_StateDelay(ThreadStatus::STATE_MUTEX_WAIT);
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#endif
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TEST_SYNC_POINT_CALLBACK("InstrumentedCondVar::TimedWaitInternal",
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&abs_time_us);
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return cond_.TimedWait(abs_time_us);
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}
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} // namespace ROCKSDB_NAMESPACE
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