Add a Host platform to the stream executor library that runs code on the CPU.

Avoid using a linker-initialized mutex in multi_platform_manager to work around a initialization/destruction ordering problem on Mac.

Include the CUDA platform ID module even in non-CUDA builds.
Change: 141045549

1 files changed, 52 insertions, 0 deletions

diff --git a/tensorflow/stream_executor/host/host_timer.cc b/tensorflow/stream_executor/host/host_timer.cc
new file mode 100644
index 0000000000..187db9f0c2
--- /dev/null
+++ b/tensorflow/stream_executor/host/host_timer.cc
@@ -0,0 +1,52 @@
+/* Copyright 2016 The TensorFlow 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 "tensorflow/stream_executor/host/host_timer.h"
+
+#include "tensorflow/stream_executor/platform/logging.h"
+#include "tensorflow/stream_executor/stream.h"
+#include "tensorflow/stream_executor/stream_executor_internal.h"
+
+namespace gpu = ::perftools::gputools;
+
+namespace perftools {
+namespace gputools {
+namespace host {
+
+using std::chrono::duration_cast;
+
+bool HostTimer::Start(Stream* stream) {
+  return stream->ThenDoHostCallback([this]() { this->StartNow(); }).ok();
+}
+
+bool HostTimer::Stop(Stream* stream) {
+  return stream->ThenDoHostCallback([this]() { this->StopNow(); }).ok();
+}
+
+uint64 HostTimer::Microseconds() const {
+  return duration_cast<std::chrono::microseconds>(duration_).count();
+}
+
+uint64 HostTimer::Nanoseconds() const {
+  return duration_cast<std::chrono::nanoseconds>(duration_).count();
+}
+
+void HostTimer::StartNow() { start_time_ = clock::now(); }
+
+void HostTimer::StopNow() { duration_ = clock::now() - start_time_; }
+
+}  // namespace host
+}  // namespace gputools
+}  // namespace perftools