chore: import upstream snapshot with attribution

paddle/phi/core/platform/timer.h

@@ -0,0 +1,63 @@
+/* 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. */
+
+#pragma once
+#include <stdlib.h>
+
+#include "paddle/phi/common/port.h"
+#include "paddle/utils/test_macros.h"
+
+#ifdef _WIN32
+static unsigned sleep(unsigned seconds) {
+  Sleep(seconds * 1000);
+  return 0;
+}
+#endif
+
+namespace paddle {
+namespace platform {
+
+// A Standard Timer implementation for debugging
+class Timer {
+ public:
+  // a timer class for profiling
+  // Reset() will be called during initialization
+  // all timing variables will be set 0 in Reset()
+  Timer() { Reset(); }
+  PADDLE_API void Reset();
+  PADDLE_API void Start();
+  PADDLE_API void Pause();
+  // Resume will get current system time
+  PADDLE_API void Resume();
+  PADDLE_API int Count();
+  // return elapsed time in us
+  PADDLE_API double ElapsedUS();
+  // return elapsed time in ms
+  PADDLE_API double ElapsedMS();
+  // return elapsed time in sec
+  PADDLE_API double ElapsedSec();
+
+ private:
+  struct timeval _start;
+  struct timeval _now;
+  int _count;
+  int64_t _elapsed;
+  bool _paused;
+
+  // get us difference between start and now
+  int64_t Tickus();
+};
+
+}  // namespace platform
+}  // namespace paddle