Ryan Macnak
f4f0831c69
Change-Id: I15078e845712e8e712e2cb0a044fc7550127ea36 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/120629 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Siva Annamalai <asiva@google.com>
102 lines
2.4 KiB
C++
102 lines
2.4 KiB
C++
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_TIMER_H_
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#define RUNTIME_VM_TIMER_H_
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#include "platform/atomic.h"
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#include "platform/utils.h"
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#include "vm/allocation.h"
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#include "vm/flags.h"
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#include "vm/os.h"
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namespace dart {
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// Timer class allows timing of specific operations in the VM.
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class Timer : public ValueObject {
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public:
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Timer(bool report, const char* message) : report_(report), message_(message) {
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Reset();
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}
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~Timer() {}
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// Start timer.
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void Start() {
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start_ = OS::GetCurrentMonotonicMicros();
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running_ = true;
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}
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// Stop timer.
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void Stop() {
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ASSERT(start_ != 0);
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ASSERT(running());
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stop_ = OS::GetCurrentMonotonicMicros();
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int64_t elapsed = ElapsedMicros();
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max_contiguous_ = Utils::Maximum(max_contiguous_.load(), elapsed);
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// Make increment atomic in case it occurs in parallel with aggregation.
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total_.fetch_add(elapsed);
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running_ = false;
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}
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// Get total cumulative elapsed time in micros.
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int64_t TotalElapsedTime() const {
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int64_t result = total_;
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if (running_) {
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int64_t now = OS::GetCurrentMonotonicMicros();
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result += (now - start_);
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}
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return result;
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}
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int64_t MaxContiguous() const {
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int64_t result = max_contiguous_;
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if (running_) {
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int64_t now = OS::GetCurrentMonotonicMicros();
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result = Utils::Maximum(result, now - start_);
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}
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return result;
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}
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void Reset() {
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start_ = 0;
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stop_ = 0;
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total_ = 0;
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max_contiguous_ = 0;
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running_ = false;
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}
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bool IsReset() const {
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return (start_ == 0) && (stop_ == 0) && (total_ == 0) &&
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(max_contiguous_ == 0) && !running_;
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}
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void AddTotal(const Timer& other) { total_.fetch_add(other.total_); }
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// Accessors.
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bool report() const { return report_; }
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bool running() const { return running_; }
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const char* message() const { return message_; }
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private:
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int64_t ElapsedMicros() const {
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ASSERT(start_ != 0);
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ASSERT(stop_ != 0);
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return stop_ - start_;
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}
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RelaxedAtomic<int64_t> start_;
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RelaxedAtomic<int64_t> stop_;
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RelaxedAtomic<int64_t> total_;
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RelaxedAtomic<int64_t> max_contiguous_;
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bool report_;
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bool running_;
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const char* message_;
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DISALLOW_COPY_AND_ASSIGN(Timer);
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};
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} // namespace dart
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#endif // RUNTIME_VM_TIMER_H_
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