add stream priority range function

Author: dmenig

doc/driver.rst

@@ -644,6 +644,10 @@ Devices and Contexts
 
     See also :mod:`pycuda.autoinit`.
 
+.. function:: get_stream_priority_range()
+
+    Returns numerical values that correspond to the least and greatest stream priorities. 
+
 .. class:: Device(number)
         Device(pci_bus_id)
 

src/cpp/cuda.hpp

@@ -531,7 +531,6 @@ namespace pycuda
    * to push contexts that are already active at a deeper stack level, so we
    * maintain all contexts floating other than the top one.
    */
-
   // for friend decl
   namespace gl {
     boost::shared_ptr<context>
@@ -862,6 +861,16 @@ namespace pycuda
     return result;
   }
 
+  inline
+  py::tuple get_stream_priority_range()
+  {
+    int leastPriority;
+    int greatestPriority;
+    CUDAPP_CALL_GUARDED(cuCtxGetStreamPriorityRange, (&leastPriority, &greatestPriority));
+    return py::make_tuple(leastPriority, greatestPriority);
+  }
+
+
 
 #if CUDAPP_CUDA_VERSION >= 7000
   inline boost::shared_ptr<context> device::retain_primary_context()

src/wrapper/wrap_cudadrv.cpp

@@ -1193,6 +1193,9 @@ BOOST_PYTHON_MODULE(_driver)
       .add_property("handle", &cl::handle_int)
       ;
   }
+
+  DEF_SIMPLE_FUNCTION(get_stream_priority_range);
+
   // }}}
 
   // {{{ stream