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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).
#pragma once
#include "monitoring/statistics.h"
#include "port/port.h"
#include "rocksdb/statistics.h"
#include "rocksdb/system_clock.h"
#include "rocksdb/thread_status.h"
#include "util/stop_watch.h"
namespace ROCKSDB_NAMESPACE {
class InstrumentedCondVar;
// A wrapper class for port::Mutex that provides additional layer
// for collecting stats and instrumentation.
class InstrumentedMutex {
public:
explicit InstrumentedMutex(bool adaptive = false)
: mutex_(adaptive), stats_(nullptr), clock_(nullptr), stats_code_(0) {}
explicit InstrumentedMutex(SystemClock* clock, bool adaptive = false)
: mutex_(adaptive), stats_(nullptr), clock_(clock), stats_code_(0) {}
InstrumentedMutex(Statistics* stats, SystemClock* clock, int stats_code,
bool adaptive = false)
: mutex_(adaptive),
stats_(stats),
clock_(clock),
stats_code_(stats_code) {}
#ifdef COERCE_CONTEXT_SWITCH
InstrumentedMutex(Statistics* stats, SystemClock* clock, int stats_code,
InstrumentedCondVar* bg_cv, bool adaptive = false)
: mutex_(adaptive),
stats_(stats),
clock_(clock),
stats_code_(stats_code),
bg_cv_(bg_cv) {}
#endif
void Lock();
void Unlock() { mutex_.Unlock(); }
void AssertHeld() { mutex_.AssertHeld(); }
private:
void LockInternal();
friend class InstrumentedCondVar;
port::Mutex mutex_;
Statistics* stats_;
SystemClock* clock_;
int stats_code_;
#ifdef COERCE_CONTEXT_SWITCH
InstrumentedCondVar* bg_cv_ = nullptr;
#endif
};
class ALIGN_AS(CACHE_LINE_SIZE) CacheAlignedInstrumentedMutex
: public InstrumentedMutex {
using InstrumentedMutex::InstrumentedMutex;
};
static_assert(alignof(CacheAlignedInstrumentedMutex) != CACHE_LINE_SIZE ||
sizeof(CacheAlignedInstrumentedMutex) % CACHE_LINE_SIZE == 0);
// RAII wrapper for InstrumentedMutex
class InstrumentedMutexLock {
public:
explicit InstrumentedMutexLock(InstrumentedMutex* mutex) : mutex_(mutex) {
mutex_->Lock();
}
~InstrumentedMutexLock() { mutex_->Unlock(); }
private:
InstrumentedMutex* const mutex_;
InstrumentedMutexLock(const InstrumentedMutexLock&) = delete;
void operator=(const InstrumentedMutexLock&) = delete;
};
// RAII wrapper for temporary releasing InstrumentedMutex inside
// InstrumentedMutexLock
class InstrumentedMutexUnlock {
public:
explicit InstrumentedMutexUnlock(InstrumentedMutex* mutex) : mutex_(mutex) {
mutex_->Unlock();
}
~InstrumentedMutexUnlock() { mutex_->Lock(); }
private:
InstrumentedMutex* const mutex_;
InstrumentedMutexUnlock(const InstrumentedMutexUnlock&) = delete;
void operator=(const InstrumentedMutexUnlock&) = delete;
};
class InstrumentedCondVar {
public:
explicit InstrumentedCondVar(InstrumentedMutex* instrumented_mutex)
: cond_(&(instrumented_mutex->mutex_)),
stats_(instrumented_mutex->stats_),
clock_(instrumented_mutex->clock_),
stats_code_(instrumented_mutex->stats_code_) {}
void Wait();
bool TimedWait(uint64_t abs_time_us);
void Signal() { cond_.Signal(); }
void SignalAll() { cond_.SignalAll(); }
private:
void WaitInternal();
bool TimedWaitInternal(uint64_t abs_time_us);
port::CondVar cond_;
Statistics* stats_;
SystemClock* clock_;
int stats_code_;
};
} // namespace ROCKSDB_NAMESPACE
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