[python-arrayfire] 179/250: Adding functions specific to CUDA backend

[Ghislain Vaillant]

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

commit c2b8f29b93426a2cc17ba2aebd9b077512ee9ce4
Author: Pavan Yalamanchili <pavan at arrayfire.com>
Date:   Fri Dec 11 15:26:44 2015 -0500

    Adding functions specific to CUDA backend
---
 arrayfire/cuda.py | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)

diff --git a/arrayfire/cuda.py b/arrayfire/cuda.py
new file mode 100644
index 0000000..4ca7810
--- /dev/null
+++ b/arrayfire/cuda.py
@@ -0,0 +1,87 @@
+#######################################################
+# Copyright (c) 2015, ArrayFire
+# All rights reserved.
+#
+# This file is distributed under 3-clause BSD license.
+# The complete license agreement can be obtained at:
+# http://arrayfire.com/licenses/BSD-3-Clause
+########################################################
+
+"""
+Functions specific to CUDA backend.
+
+This module provides interoperability with other CUDA libraries.
+"""
+
+def get_stream(idx):
+    """
+    Get the CUDA stream used for the device `idx` by ArrayFire.
+
+    Parameters
+    ----------
+
+    idx : int.
+        Specifies the index of the device.
+
+    Returns
+    -----------
+    stream : integer denoting the stream id.
+    """
+
+    import ctypes as ct
+    from .util import safe_call as safe_call
+    from .library import backend as backend
+
+    if (backend.name() != "cuda"):
+        raise RuntimeError("Invalid backend loaded")
+
+    stream = ct.c_void_p(0)
+    safe_call(backend.get().afcu_get_stream(ct.pointer(stream), idx))
+    return stream.value
+
+def get_native_id(idx):
+    """
+    Get native (unsorted) CUDA device ID
+
+    Parameters
+    ----------
+
+    idx : int.
+        Specifies the (sorted) index of the device.
+
+    Returns
+    -----------
+    native_idx : integer denoting the native cuda id.
+    """
+
+    import ctypes as ct
+    from .util import safe_call as safe_call
+    from .library import backend as backend
+
+    if (backend.name() != "cuda"):
+        raise RuntimeError("Invalid backend loaded")
+
+    native = ct.c_int(0)
+    safe_call(backend.get().afcu_get_native_id(ct.pointer(native), idx))
+    return native.value
+
+def set_native_id(idx):
+    """
+    Set native (unsorted) CUDA device ID
+
+    Parameters
+    ----------
+
+    idx : int.
+        Specifies the (unsorted) native index of the device.
+    """
+
+    import ctypes as ct
+    from .util import safe_call as safe_call
+    from .library import backend as backend
+
+    if (backend.name() != "cuda"):
+        raise RuntimeError("Invalid backend loaded")
+
+    safe_call(backend.get().afcu_set_native_id(idx))
+    return

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