mirror of https://github.com/facebook/rocksdb.git
125 lines
3.2 KiB
C++
125 lines
3.2 KiB
C++
// 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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#pragma once
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#include "monitoring/statistics.h"
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#include "port/port.h"
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#include "rocksdb/statistics.h"
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#include "rocksdb/system_clock.h"
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#include "rocksdb/thread_status.h"
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#include "util/stop_watch.h"
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namespace ROCKSDB_NAMESPACE {
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class InstrumentedCondVar;
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// A wrapper class for port::Mutex that provides additional layer
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// for collecting stats and instrumentation.
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class InstrumentedMutex {
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public:
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explicit InstrumentedMutex(bool adaptive = false)
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: mutex_(adaptive), stats_(nullptr), clock_(nullptr), stats_code_(0) {}
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explicit InstrumentedMutex(SystemClock* clock, bool adaptive = false)
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: mutex_(adaptive), stats_(nullptr), clock_(clock), stats_code_(0) {}
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InstrumentedMutex(Statistics* stats, SystemClock* clock, int stats_code,
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bool adaptive = false)
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: mutex_(adaptive),
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stats_(stats),
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clock_(clock),
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stats_code_(stats_code) {}
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void Lock();
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void Unlock() {
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mutex_.Unlock();
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}
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void AssertHeld() {
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mutex_.AssertHeld();
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}
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private:
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void LockInternal();
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friend class InstrumentedCondVar;
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port::Mutex mutex_;
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Statistics* stats_;
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SystemClock* clock_;
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int stats_code_;
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};
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class ALIGN_AS(CACHE_LINE_SIZE) CacheAlignedInstrumentedMutex
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: public InstrumentedMutex {
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using InstrumentedMutex::InstrumentedMutex;
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char padding[(CACHE_LINE_SIZE - sizeof(InstrumentedMutex) % CACHE_LINE_SIZE) %
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CACHE_LINE_SIZE] ROCKSDB_FIELD_UNUSED;
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};
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static_assert(sizeof(CacheAlignedInstrumentedMutex) % CACHE_LINE_SIZE == 0);
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// RAII wrapper for InstrumentedMutex
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class InstrumentedMutexLock {
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public:
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explicit InstrumentedMutexLock(InstrumentedMutex* mutex) : mutex_(mutex) {
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mutex_->Lock();
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}
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~InstrumentedMutexLock() {
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mutex_->Unlock();
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}
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private:
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InstrumentedMutex* const mutex_;
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InstrumentedMutexLock(const InstrumentedMutexLock&) = delete;
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void operator=(const InstrumentedMutexLock&) = delete;
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};
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// RAII wrapper for temporary releasing InstrumentedMutex inside
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// InstrumentedMutexLock
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class InstrumentedMutexUnlock {
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public:
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explicit InstrumentedMutexUnlock(InstrumentedMutex* mutex) : mutex_(mutex) {
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mutex_->Unlock();
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}
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~InstrumentedMutexUnlock() { mutex_->Lock(); }
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private:
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InstrumentedMutex* const mutex_;
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InstrumentedMutexUnlock(const InstrumentedMutexUnlock&) = delete;
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void operator=(const InstrumentedMutexUnlock&) = delete;
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};
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class InstrumentedCondVar {
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public:
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explicit InstrumentedCondVar(InstrumentedMutex* instrumented_mutex)
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: cond_(&(instrumented_mutex->mutex_)),
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stats_(instrumented_mutex->stats_),
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clock_(instrumented_mutex->clock_),
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stats_code_(instrumented_mutex->stats_code_) {}
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void Wait();
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bool TimedWait(uint64_t abs_time_us);
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void Signal() {
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cond_.Signal();
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}
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void SignalAll() {
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cond_.SignalAll();
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}
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private:
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void WaitInternal();
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bool TimedWaitInternal(uint64_t abs_time_us);
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port::CondVar cond_;
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Statistics* stats_;
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SystemClock* clock_;
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int stats_code_;
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};
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} // namespace ROCKSDB_NAMESPACE
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