usage_timer.h

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/*
 *
 * Copyright 2015 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
 
#ifndef TEST_QPS_USAGE_TIMER_H
#define TEST_QPS_USAGE_TIMER_H
 
class UsageTimer {
 public:
  UsageTimer();
 
  struct Result {
    double wall;
    double user;
    double system;
    unsigned long long total_cpu_time;
    unsigned long long idle_cpu_time;
  };
 
  Result Mark() const;
 
  static double Now();
 
 private:
  static Result Sample();
 
  const Result start_;
};
 
#endif  // TEST_QPS_TIMER_H