P4 to Git Change 1602601 by skudchad@skudchad_test2_win_opencl on 2018/09/06 15:01:00

SWDEV-145570 - [HIP] Implement hipStreamAddCallback and hipStreamQuery

	ReviewBoardURL = http://ocltc.amd.com/reviews/r/15749/diff/

Affected files ...

... //depot/stg/opencl/drivers/opencl/api/hip/hip_stream.cpp#13 edit
... //depot/stg/opencl/drivers/opencl/runtime/platform/commandqueue.cpp#27 edit
... //depot/stg/opencl/drivers/opencl/runtime/platform/commandqueue.hpp#19 edit
... //depot/stg/opencl/drivers/opencl/runtime/utils/concurrent.hpp#9 edit

rocclr/runtime/utils/concurrent.hpp

@@ -90,6 +90,9 @@ template <typename T, int N = 5> class ConcurrentLinkedQueue : public HeapObject
 
   //! \brief Dequeue an element from this queue.
   inline T dequeue();
+
+  //! \brief Check if queue is empty
+  inline bool empty();
 };
 
 /*@}*/
@@ -169,6 +172,22 @@ template <typename T, int N> inline T ConcurrentLinkedQueue<T, N>::dequeue() {
   }
 }
 
+template <typename T, int N> inline bool ConcurrentLinkedQueue<T, N>::empty() {
+  for (;;) {
+    typename Node::Ptr head = head_.load(std::memory_order_acquire);
+    typename Node::Ptr tail = tail_.load(std::memory_order_acquire);
+    typename Node::Ptr next = head->ptr()->next_.load(std::memory_order_acquire);
+    if (likely(head == head_.load(std::memory_order_acquire))) {
+      if (head->ptr() == tail->ptr()) {
+        if (next->ptr() == NULL) {
+          return true;
+        }
+      }
+      return false;
+    }
+  }
+}
+
 }  // namespace amd
 
 #endif /*CONCURRENT_HPP_*/