add rw lock test (#12752)

* add rw lock test

* optimize read_write and wirte_read test

paddle/fluid/framework/CMakeLists.txt

@@ -115,6 +115,8 @@ cc_test(cow_ptr_tests SRCS details/cow_ptr_test.cc)
 # cc_test(channel_test SRCS channel_test.cc)
 cc_test(tuple_test SRCS tuple_test.cc )
 
+cc_test(rw_lock_test SRCS rw_lock_test.cc)
+
 # disable test temporarily.
 # TODO https://github.com/PaddlePaddle/Paddle/issues/11971
 # cc_test(concurrency_test SRCS concurrency_test.cc DEPS go_op channel_close_op channel_create_op

paddle/fluid/framework/rw_lock.h

-/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
+/* Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -16,6 +16,8 @@ limitations under the License. */
 
 #include <pthread.h>
 
+#include "paddle/fluid/platform/enforce.h"
+
 namespace paddle {
 namespace framework {
 

paddle/fluid/framework/rw_lock_test.cc

+/* Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
+
+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. */
+
+#include "paddle/fluid/framework/rw_lock.h"
+#include <gtest/gtest.h>
+#include <chrono>  // NOLINT
+#include <thread>  // NOLINT
+#include <vector>
+
+namespace f = paddle::framework;
+
+void f1(f::RWLock *lock) {
+  lock->RDLock();
+  lock->UNLock();
+}
+
+TEST(RWLOCK, read_read) {
+  f::RWLock lock;
+  lock.RDLock();
+  std::thread t1(f1, &lock);
+  std::thread t2(f1, &lock);
+  t1.join();
+  t2.join();
+  lock.UNLock();
+}
+
+void f2(f::RWLock *lock, std::vector<int> *result) {
+  lock->RDLock();
+  ASSERT_EQ(result->size(), 0UL);
+  lock->UNLock();
+}
+
+void f3(f::RWLock *lock, std::vector<int> *result) {
+  lock->WRLock();
+  result->push_back(1);
+  lock->UNLock();
+}
+
+TEST(RWLOCK, read_write) {
+  f::RWLock lock;
+  std::vector<int> result;
+
+  lock.RDLock();
+  std::thread t1(f2, &lock, &result);
+  t1.join();
+  std::thread t2(f3, &lock, &result);
+  std::this_thread::sleep_for(std::chrono::seconds(1));
+  ASSERT_EQ(result.size(), 0UL);
+  lock.UNLock();
+  t2.join();
+  ASSERT_EQ(result.size(), 1UL);
+}
+
+void f4(f::RWLock *lock, std::vector<int> *result) {
+  lock->RDLock();
+  ASSERT_EQ(result->size(), 1UL);
+  lock->UNLock();
+}
+
+TEST(RWLOCK, write_read) {
+  f::RWLock lock;
+  std::vector<int> result;
+
+  lock.WRLock();
+  std::thread t1(f4, &lock, &result);
+  std::this_thread::sleep_for(std::chrono::seconds(1));
+  result.push_back(1);
+  lock.UNLock();
+  t1.join();
+}