[arrayfire] 183/284: FEAT Add getActiveBackend function

[Ghislain Vaillant]

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

commit 56f9140d880b5816817aa8e3bd78c114492de56b
Author: Shehzan Mohammed <shehzan at arrayfire.com>
Date:   Fri Jan 8 23:21:01 2016 -0500

    FEAT Add getActiveBackend function
---
 docs/details/backend.dox   |  9 +++++++++
 include/af/backend.h       | 20 ++++++++++++++++++++
 src/api/c/device.cpp       |  6 ++++++
 src/api/cpp/device.cpp     |  7 +++++++
 src/api/unified/device.cpp |  6 ++++++
 test/backend.cpp           | 15 +++++++++++++++
 6 files changed, 63 insertions(+)

diff --git a/docs/details/backend.dox b/docs/details/backend.dox
index 4d9cdf6..146cc14 100644
--- a/docs/details/backend.dox
+++ b/docs/details/backend.dox
@@ -71,5 +71,14 @@ The return value specifies which backend the array was created on.
 
 =======================================================================
 
+\defgroup unified_func_getactivebackend getActiveBackend
+
+\brief Get's the backend enum for the active backend
+
+\ingroup unified_func
+\ingroup arrayfire_func
+
+=======================================================================
+
 @}
 */
diff --git a/include/af/backend.h b/include/af/backend.h
index 93d8d8d..0342ef0 100644
--- a/include/af/backend.h
+++ b/include/af/backend.h
@@ -55,6 +55,17 @@ AFAPI af_err af_get_available_backends(int* backends);
 AFAPI af_err af_get_backend_id(af_backend *backend, const af_array in);
 #endif
 
+#if AF_API_VERSION >= 33
+/**
+   \param[out] backend takes one of the values of enum \ref af_backend
+   from the backend that is currently set to active
+   \returns \ref af_err error code
+
+   \ingroup unified_func_getactivebackend
+ */
+AFAPI af_err af_get_active_backend(af_backend *backend);
+#endif
+
 #ifdef __cplusplus
 }
 #endif
@@ -101,5 +112,14 @@ AFAPI int getAvailableBackends();
 AFAPI af::Backend getBackendId(const array &in);
 #endif
 
+#if AF_API_VERSION >= 33
+/**
+   \returns \ref af_backend which is the backend is currently active
+
+   \ingroup unified_func_getctivebackend
+ */
+AFAPI af::Backend getActiveBackend();
+#endif
+
 }
 #endif
diff --git a/src/api/c/device.cpp b/src/api/c/device.cpp
index 8f33299..d782211 100644
--- a/src/api/c/device.cpp
+++ b/src/api/c/device.cpp
@@ -53,6 +53,12 @@ af_err af_get_backend_id(af_backend *result, const af_array in)
     return AF_SUCCESS;
 }
 
+af_err af_get_active_backend(af_backend *result)
+{
+    *result = (af_backend)getBackend();
+    return AF_SUCCESS;
+}
+
 af_err af_init()
 {
     try {
diff --git a/src/api/cpp/device.cpp b/src/api/cpp/device.cpp
index 3b1609b..5e4b0f7 100644
--- a/src/api/cpp/device.cpp
+++ b/src/api/cpp/device.cpp
@@ -42,6 +42,13 @@ namespace af
         return result;
     }
 
+    af::Backend getActiveBackend()
+    {
+        af::Backend result = (af::Backend)0;
+        AF_THROW(af_get_active_backend(&result));
+        return result;
+    }
+
     void info()
     {
         AF_THROW(af_info());
diff --git a/src/api/unified/device.cpp b/src/api/unified/device.cpp
index f7e9556..fbd8e32 100644
--- a/src/api/unified/device.cpp
+++ b/src/api/unified/device.cpp
@@ -35,6 +35,12 @@ af_err af_get_backend_id(af_backend *result, const af_array in)
     return CALL(result, in);
 }
 
+af_err af_get_active_backend(af_backend *result)
+{
+    *result = unified::AFSymbolManager::getInstance().getActiveBackend();
+    return AF_SUCCESS;
+}
+
 af_err af_info()
 {
     return CALL_NO_PARAMS();
diff --git a/test/backend.cpp b/test/backend.cpp
index 7b8dbdd..4bb5cdf 100644
--- a/test/backend.cpp
+++ b/test/backend.cpp
@@ -21,11 +21,26 @@
 using std::string;
 using std::vector;
 
+const char *getActiveBackendString()
+{
+    af_backend active = (af_backend)0;
+    af_get_active_backend(&active);
+
+    switch(active) {
+        case AF_BACKEND_CPU   : return "AF_BACKEND_CPU";
+        case AF_BACKEND_CUDA  : return "AF_BACKEND_CUDA";
+        case AF_BACKEND_OPENCL: return "AF_BACKEND_OPENCL";
+        default               : return "AF_BACKEND_DEFAULT";
+    }
+}
+
 template<typename T>
 void testFunction()
 {
     af_info();
 
+    printf("Active Backend Enum = %s\n", getActiveBackendString());
+
     af_array outArray = 0;
     dim_t dims[] = {32, 32};
     ASSERT_EQ(AF_SUCCESS, af_randu(&outArray, 2, dims, (af_dtype) af::dtype_traits<T>::af_type));

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