The return value of WaitForInternalThreadToExit has reversed

src/caffe/layers/data_layer.cpp

@@ -249,7 +249,7 @@ void DataLayer<Dtype>::CreatePrefetchThread() {
 
 template <typename Dtype>
 void DataLayer<Dtype>::JoinPrefetchThread() {
-  CHECK(!WaitForInternalThreadToExit()) << "Thread joining failed";
+  CHECK(WaitForInternalThreadToExit()) << "Thread joining failed";
 }
 
 template <typename Dtype>

src/caffe/layers/image_data_layer.cpp

@@ -172,7 +172,7 @@ void ImageDataLayer<Dtype>::ShuffleImages() {
 
 template <typename Dtype>
 void ImageDataLayer<Dtype>::JoinPrefetchThread() {
-  CHECK(!WaitForInternalThreadToExit()) << "Thread joining failed";
+  CHECK(WaitForInternalThreadToExit()) << "Thread joining failed";
 }
 
 template <typename Dtype>

src/caffe/layers/window_data_layer.cpp

@@ -413,7 +413,7 @@ void WindowDataLayer<Dtype>::CreatePrefetchThread() {
 
 template <typename Dtype>
 void WindowDataLayer<Dtype>::JoinPrefetchThread() {
-  CHECK(!WaitForInternalThreadToExit()) << "Thread joining failed.";
+  CHECK(WaitForInternalThreadToExit()) << "Thread joining failed.";
 }
 
 template <typename Dtype>