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      1 /* Copyright 2016 The TensorFlow Authors. All Rights Reserved.
      2 
      3 Licensed under the Apache License, Version 2.0 (the "License");
      4 you may not use this file except in compliance with the License.
      5 You may obtain a copy of the License at
      6 
      7     http://www.apache.org/licenses/LICENSE-2.0
      8 
      9 Unless required by applicable law or agreed to in writing, software
     10 distributed under the License is distributed on an "AS IS" BASIS,
     11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12 See the License for the specific language governing permissions and
     13 limitations under the License.
     14 ==============================================================================*/
     15 
     16 #include "tensorflow/core/kernels/batching_util/fake_clock_env.h"
     17 
     18 #include <string>
     19 
     20 namespace tensorflow {
     21 namespace serving {
     22 namespace test_util {
     23 
     24 FakeClockEnv::FakeClockEnv(Env* wrapped) : EnvWrapper(wrapped) {}
     25 
     26 void FakeClockEnv::AdvanceByMicroseconds(int micros) {
     27   {
     28     mutex_lock l(mu_);
     29     current_time_ += micros;
     30     for (auto it = sleeping_threads_.begin(); it != sleeping_threads_.end();) {
     31       if (current_time_ >= it->wake_time) {
     32         it->wake_notification->Notify();
     33         it = sleeping_threads_.erase(it);
     34       } else {
     35         ++it;
     36       }
     37     }
     38   }
     39 }
     40 
     41 void FakeClockEnv::BlockUntilSleepingThread(uint64 wake_time) {
     42   for (;;) {
     43     {
     44       mutex_lock l(mu_);
     45       for (auto it = sleeping_threads_.begin(); it != sleeping_threads_.end();
     46            ++it) {
     47         if (it->wake_time == wake_time) {
     48           return;
     49         }
     50       }
     51     }
     52     EnvWrapper::SleepForMicroseconds(100);
     53   }
     54 }
     55 
     56 void FakeClockEnv::BlockUntilThreadsAsleep(int num_threads) {
     57   for (;;) {
     58     {
     59       mutex_lock l(mu_);
     60       if (num_threads <= sleeping_threads_.size()) {
     61         return;
     62       }
     63     }
     64     EnvWrapper::SleepForMicroseconds(100);
     65   }
     66 }
     67 
     68 uint64 FakeClockEnv::NowMicros() {
     69   {
     70     mutex_lock l(mu_);
     71     return current_time_;
     72   }
     73 }
     74 
     75 void FakeClockEnv::SleepForMicroseconds(int64 micros) {
     76   if (micros == 0) {
     77     return;
     78   }
     79 
     80   Notification wake_notification;
     81   {
     82     mutex_lock l(mu_);
     83     sleeping_threads_.push_back({current_time_ + micros, &wake_notification});
     84   }
     85   wake_notification.WaitForNotification();
     86 }
     87 
     88 }  // namespace test_util
     89 }  // namespace serving
     90 }  // namespace tensorflow
     91