1/* Copyright 2015 The TensorFlow Authors. All Rights Reserved. 2 3Licensed under the Apache License, Version 2.0 (the "License"); 4you may not use this file except in compliance with the License. 5You may obtain a copy of the License at 6 7 http://www.apache.org/licenses/LICENSE-2.0 8 9Unless required by applicable law or agreed to in writing, software 10distributed under the License is distributed on an "AS IS" BASIS, 11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12See the License for the specific language governing permissions and 13limitations under the License. 14==============================================================================*/ 15 16#include "tensorflow/core/platform/test.h" 17 18#include "tensorflow/core/lib/core/notification.h" 19#include "tensorflow/core/lib/core/threadpool.h" 20#include "tensorflow/core/platform/mutex.h" 21#include "tensorflow/core/platform/types.h" 22 23namespace tensorflow { 24namespace { 25 26TEST(NotificationTest, TestSingleNotification) { 27 thread::ThreadPool* thread_pool = 28 new thread::ThreadPool(Env::Default(), "test", 1); 29 30 int counter = 0; 31 Notification start; 32 Notification proceed; 33 thread_pool->Schedule([&start, &proceed, &counter] { 34 start.Notify(); 35 proceed.WaitForNotification(); 36 ++counter; 37 }); 38 39 // Wait for the thread to start 40 start.WaitForNotification(); 41 42 // The thread should be waiting for the 'proceed' notification. 43 EXPECT_EQ(0, counter); 44 45 // Unblock the thread 46 proceed.Notify(); 47 48 delete thread_pool; // Wait for closure to finish. 49 50 // Verify the counter has been incremented 51 EXPECT_EQ(1, counter); 52} 53 54TEST(NotificationTest, TestMultipleThreadsWaitingOnNotification) { 55 const int num_closures = 4; 56 thread::ThreadPool* thread_pool = 57 new thread::ThreadPool(Env::Default(), "test", num_closures); 58 59 mutex lock; 60 int counter = 0; 61 Notification n; 62 63 for (int i = 0; i < num_closures; ++i) { 64 thread_pool->Schedule([&n, &lock, &counter] { 65 n.WaitForNotification(); 66 mutex_lock l(lock); 67 ++counter; 68 }); 69 } 70 71 // Sleep 1 second. 72 Env::Default()->SleepForMicroseconds(1 * 1000 * 1000); 73 74 EXPECT_EQ(0, counter); 75 76 n.Notify(); 77 delete thread_pool; // Wait for all closures to finish. 78 EXPECT_EQ(4, counter); 79} 80 81TEST(NotificationTest, TestWaitWithTimeoutOnNotifiedNotification) { 82 Notification n; 83 n.Notify(); 84 EXPECT_TRUE(WaitForNotificationWithTimeout(&n, 1000 * 1000)); 85} 86 87} // namespace 88} // namespace tensorflow 89