Minor change

src/IO/AsynchronousReader.h

@@ -45,7 +45,7 @@ public:
         size_t offset = 0;
         size_t size = 0;
         char * buf = nullptr;
-        int priority = 0;
+        int64_t priority = 0;
     };
 
     /// Less than requested amount of data can be returned.

src/IO/ThreadPoolReader.h

@@ -110,6 +110,7 @@ public:
                     else if (errno == EAGAIN)
                     {
                         /// Data is not available.
+                        std::cerr << "miss\n";
                         break;
                     }
                     else if (errno == EINTR)
@@ -133,6 +134,7 @@ public:
 
             if (bytes_read)
             {
+                std::cerr << "hit\n";
                 promise.set_value(bytes_read);
                 return future;
             }