Revision 2d02ec653355e4f558bd3bb2ef0e442520de26f9 authored by Bradley Grainger on 16 June 2014, 22:41:46 UTC, committed by Bradley Grainger on 16 June 2014, 22:41:46 UTC
Some platforms, particularly Windows, do not have a single method that can release both a held reader lock and a held writer lock; instead, a separate method (ReleaseSRWLockShared or ReleaseSRWLockExclusive) must be called in each case. This may also be necessary to back MutexRW with a shared_mutex in C++14; the current language proposal includes both an unlock() and a shared_unlock() method.
1 parent 983c93d
perf_context_imp.h
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
#pragma once
#include "rocksdb/perf_context.h"
#include "util/stop_watch.h"
namespace rocksdb {
#if defined(NPERF_CONTEXT) || defined(IOS_CROSS_COMPILE)
#define PERF_TIMER_DECLARE()
#define PERF_TIMER_START(metric)
#define PERF_TIMER_AUTO(metric)
#define PERF_TIMER_MEASURE(metric)
#define PERF_TIMER_STOP(metric)
#define PERF_COUNTER_ADD(metric, value)
#else
extern __thread PerfLevel perf_level;
class PerfStepTimer {
public:
PerfStepTimer()
: enabled_(perf_level >= PerfLevel::kEnableTime),
env_(enabled_ ? Env::Default() : nullptr),
start_(0) {
}
void Start() {
if (enabled_) {
start_ = env_->NowNanos();
}
}
void Measure(uint64_t* metric) {
if (start_) {
uint64_t now = env_->NowNanos();
*metric += now - start_;
start_ = now;
}
}
void Stop(uint64_t* metric) {
if (start_) {
*metric += env_->NowNanos() - start_;
start_ = 0;
}
}
private:
const bool enabled_;
Env* const env_;
uint64_t start_;
};
// Declare the local timer object to be used later on
#define PERF_TIMER_DECLARE() \
PerfStepTimer perf_step_timer;
// Set start time of the timer
#define PERF_TIMER_START(metric) \
perf_step_timer.Start();
// Declare and set start time of the timer
#define PERF_TIMER_AUTO(metric) \
PerfStepTimer perf_step_timer; \
perf_step_timer.Start();
// Update metric with time elapsed since last START. start time is reset
// to current timestamp.
#define PERF_TIMER_MEASURE(metric) \
perf_step_timer.Measure(&(perf_context.metric));
// Update metric with time elapsed since last START. But start time is not set.
#define PERF_TIMER_STOP(metric) \
perf_step_timer.Stop(&(perf_context.metric));
// Increase metric value
#define PERF_COUNTER_ADD(metric, value) \
perf_context.metric += value;
#endif
}
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