From a7866113146229514870f51c5c7d2c6001eada60 Mon Sep 17 00:00:00 2001
From: fengjiayi <fengjiayi@baidu.com>
Date: Wed, 25 Apr 2018 19:41:52 +0800
Subject: [PATCH] Replace Channel in MultiFileReader with BlockingQueue

---
 .../fluid/operators/reader/open_files_op.cc   | 26 +++++++++----------
 1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/paddle/fluid/operators/reader/open_files_op.cc b/paddle/fluid/operators/reader/open_files_op.cc
index 779dc8a6a0d..461b56c7a43 100644
--- a/paddle/fluid/operators/reader/open_files_op.cc
+++ b/paddle/fluid/operators/reader/open_files_op.cc
@@ -14,7 +14,7 @@
 
 #include <thread>  // NOLINT
 
-#include "paddle/fluid/framework/channel.h"
+#include "paddle/fluid/operators/reader/blocking_queue.h"
 #include "paddle/fluid/operators/reader/reader_op_registry.h"
 
 namespace paddle {
@@ -48,9 +48,9 @@ class MultiFileReader : public framework::ReaderBase {
   std::thread scheduler_;
   std::vector<std::thread> prefetchers_;
   size_t buffer_size_;
-  framework::Channel<size_t>* waiting_file_idx_;
-  framework::Channel<size_t>* available_thread_idx_;
-  framework::Channel<std::vector<framework::LoDTensor>>* buffer_;
+  reader::BlockingQueue<size_t>* waiting_file_idx_;
+  reader::BlockingQueue<size_t>* available_thread_idx_;
+  reader::BlockingQueue<std::vector<framework::LoDTensor>>* buffer_;
 };
 
 void MultiFileReader::ReadNext(std::vector<framework::LoDTensor>* out) {
@@ -73,17 +73,17 @@ bool MultiFileReader::HasNext() {
 
 void MultiFileReader::StartNewScheduler() {
   size_t thread_num = prefetchers_.size();
-  waiting_file_idx_ = framework::MakeChannel<size_t>(file_names_.size());
-  available_thread_idx_ = framework::MakeChannel<size_t>(thread_num);
-  buffer_ =
-      framework::MakeChannel<std::vector<framework::LoDTensor>>(buffer_size_);
+  waiting_file_idx_ = new reader::BlockingQueue<size_t>(file_names_.size());
+  available_thread_idx_ = new reader::BlockingQueue<size_t>(thread_num);
+  buffer_ = new reader::BlockingQueue<std::vector<framework::LoDTensor>>(
+      buffer_size_);
 
   for (size_t i = 0; i < file_names_.size(); ++i) {
-    waiting_file_idx_->Send(&i);
+    waiting_file_idx_->Send(i);
   }
   waiting_file_idx_->Close();
   for (size_t i = 0; i < thread_num; ++i) {
-    available_thread_idx_->Send(&i);
+    available_thread_idx_->Send(i);
   }
 
   scheduler_ = std::thread([this] { ScheduleThreadFunc(); });
@@ -149,7 +149,7 @@ void MultiFileReader::PrefetchThreadFunc(std::string file_name,
       break;
     }
     try {
-      buffer_->Send(&ins);
+      buffer_->Send(std::move(ins));
     } catch (paddle::platform::EnforceNotMet e) {
       VLOG(5) << "WARNING: The buffer channel has been closed. The prefetch "
                  "thread of file '"
@@ -158,9 +158,7 @@ void MultiFileReader::PrefetchThreadFunc(std::string file_name,
     }
   }
 
-  try {
-    available_thread_idx_->Send(&thread_idx);
-  } catch (paddle::platform::EnforceNotMet e) {
+  if (!available_thread_idx_->Send(thread_idx)) {
     VLOG(5) << "WARNING: The available_thread_idx_ channel has been closed. "
                "Fail to send thread_idx.";
   }
-- 
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