[python-arrayfire] 39/58: Check and load a functional backend

[Ghislain Vaillant]

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ghisvail-guest pushed a commit to branch master
in repository python-arrayfire.

commit d8db269942e92a9eeab482d1dc5b3d6788e31122
Author: pradeep <pradeep at arrayfire.com>
Date:   Sun Sep 18 22:17:39 2016 +0530

    Check and load a functional backend
    
    Though libraries of a given backend can be present on the target
    machine, there can be scenarios where a compatible hardware device
    is not available. In such cases, backend loader checks if current
    selected backend has a device ready for use. If no appropriate
    device exists, the next backend in the priority list is checked
    for same criteria. This process is repeated until a working
    backend is found. In the event that no functional backend is found,
    the program throws a runtime error.
---
 arrayfire/library.py | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/arrayfire/library.py b/arrayfire/library.py
index cbf85f2..93d3cd5 100644
--- a/arrayfire/library.py
+++ b/arrayfire/library.py
@@ -534,9 +534,23 @@ class _clibrary(object):
                 except:
                     pass
 
+        c_dim4 = c_dim_t*4
+
+        out = c_dim_t(0)
+        dims = c_dim4(10, 10, 10, 10)
+
+        for key, value in self.__clibs:
+            err = value.af_randu(ct.pointer(out), 4, ct.pointer(dims), 0)
+            if (err == ERR.NONE.value):
+                if (self.__name != key):
+                    self.__name = key
+                break
+            else:
+                self.__name = None
+                pass
+
         if (self.__name is None):
-            raise RuntimeError("Could not load any ArrayFire libraries.\n" +
-                               more_info_str)
+            raise RuntimeError("Could not load any ArrayFire libraries.\n" + more_info_str)
 
     def get_id(self, name):
         return self.__backend_name_map[name]

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