chore: import upstream snapshot with attribution

test/cpp/fluid/memory/mmap_allocator_test.cc

@@ -0,0 +1,53 @@
+// Copyright (c) 2020 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.
+
+#ifndef _WIN32
+
+#include "paddle/phi/core/memory/allocation/mmap_allocator.h"
+
+#include "gtest/gtest.h"
+
+namespace paddle {
+namespace memory {
+namespace allocation {
+
+TEST(MemoryMapAllocation, test_allocation_base) {
+  size_t data_size = 4UL * 1024;
+
+  // 1. allocate writer holder
+  auto mmap_writer_holder = AllocateMemoryMapWriterAllocation(data_size);
+  std::string ipc_name = mmap_writer_holder->ipc_name();
+  // 2. write data
+  auto* writer_ptr = static_cast<int32_t*>(mmap_writer_holder->ptr());
+  for (int32_t i = 0; i < 1024; ++i) {
+    writer_ptr[i] = i;
+  }
+  // 3. create child process
+  pid_t fpid = fork();
+  if (fpid == 0) {
+    // 4. rebuild reader holder
+    auto mmap_reader_holder =
+        RebuildMemoryMapReaderAllocation(ipc_name, data_size);
+    auto* reader_ptr = static_cast<int32_t*>(mmap_reader_holder->ptr());
+    for (int32_t i = 0; i < 1024; ++i) {
+      ASSERT_EQ(reader_ptr[i], i);
+    }
+  }
+}
+
+}  // namespace allocation
+}  // namespace memory
+}  // namespace paddle
+
+#endif