1 files changed, 90 insertions, 0 deletions
diff --git a/src/rocksdb/monitoring/instrumented_mutex.cc b/src/rocksdb/monitoring/instrumented_mutex.cc
new file mode 100644
index 000000000..699495a34
--- /dev/null
+++ b/src/rocksdb/monitoring/instrumented_mutex.cc
@@ -0,0 +1,90 @@
+//  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