1 files changed, 72 insertions, 0 deletions
diff --git a/tensorflow/compiler/xla/service/cpu/infeed_manager.cc b/tensorflow/compiler/xla/service/cpu/infeed_manager.cc
new file mode 100644
index 0000000000..23a2dfcc32
--- /dev/null
+++ b/tensorflow/compiler/xla/service/cpu/infeed_manager.cc
@@ -0,0 +1,72 @@
+/* Copyright 2017 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/compiler/xla/service/cpu/infeed_manager.h"
+
+#include "tensorflow/core/platform/logging.h"
+
+namespace xla {
+namespace cpu {
+namespace runtime {
+
+InfeedBuffer::~InfeedBuffer() = default;
+
+InfeedManager::InfeedManager() : current_buffer_(nullptr) {}
+
+void InfeedManager::Reset() {
+  std::unique_lock<std::mutex> l(mu_);
+  CHECK(!current_buffer_);
+  for (auto buffer : enqueued_buffer_) {
+    buffer->Done();
+  }
+  enqueued_buffer_.clear();
+}
+
+void InfeedManager::EnqueueBuffer(InfeedBuffer* buffer) {
+  std::unique_lock<std::mutex> l(mu_);
+  bool was_empty = enqueued_buffer_.empty();
+  enqueued_buffer_.push_back(buffer);
+  if (was_empty) {
+    // This has the potential to suffer from the notified thread
+    // immediately trying and failing to acquire mu_, but seems
+    // preferable to the alternative of notifying outside the lock
+    // on every enqueue.
+    cv_.notify_one();
+  }
+}
+
+InfeedBuffer* InfeedManager::BlockingDequeueBuffer() {
+  std::unique_lock<std::mutex> l(mu_);
+  while (enqueued_buffer_.empty()) {
+    cv_.wait(l);
+  }
+  CHECK(!current_buffer_);
+  current_buffer_ = enqueued_buffer_.front();
+  enqueued_buffer_.pop_front();
+  return current_buffer_;
+}
+
+void InfeedManager::ReleaseCurrentBuffer(int32 length, void* data) {
+  std::unique_lock<std::mutex> l(mu_);
+  CHECK(current_buffer_);
+  CHECK_EQ(length, current_buffer_->length());
+  CHECK_EQ(data, current_buffer_->data());
+  current_buffer_->Done();
+  current_buffer_ = nullptr;
+}
+
+}  // namespace runtime
+}  // namespace cpu
+}  // namespace xla