Fix #702: Update cyruntime.getLocalRuntimeVersion to use pathfinder

cuda_bindings/cuda/bindings/cyruntime.pyx.in

@@ -1885,35 +1885,44 @@ cdef cudaError_t cudaGraphicsVDPAURegisterOutputSurface(cudaGraphicsResource** r
 
 {{if True}}
 
-{{if 'Windows' != platform.system()}}
+from libc.stdint cimport uintptr_t
+from cuda.pathfinder import load_nvidia_dynamic_lib
+{{if 'Windows' == platform.system()}}
+cimport cuda.bindings._lib.windll as windll
+{{else}}
 cimport cuda.bindings._lib.dlfcn as dlfcn
 {{endif}}
 
 cdef cudaError_t getLocalRuntimeVersion(int* runtimeVersion) except ?cudaErrorCallRequiresNewerDriver nogil:
-    {{if 'Windows' == platform.system()}}
-    with gil:
-        raise NotImplementedError('"getLocalRuntimeVersion" is unsupported on Windows')
-    {{else}}
+
     # Load
-    handle = dlfcn.dlopen('libcudart.so.13', dlfcn.RTLD_NOW)
-    if handle == NULL:
-        with gil:
-            raise RuntimeError(f'Failed to dlopen libcudart.so.13')
+    with gil:
+        lib = load_nvidia_dynamic_lib("cudart")
+        {{if 'Windows' == platform.system()}}
+        handle = <uintptr_t>lib._handle_uint
+        {{else}}
+        handle = <void *><uintptr_t>lib._handle_uint
+        {{endif}}
 
+    {{if 'Windows' == platform.system()}}
+    __cudaRuntimeGetVersion = windll.GetProcAddress(handle, b'cudaRuntimeGetVersion')
+    {{else}}
     __cudaRuntimeGetVersion = dlfcn.dlsym(handle, 'cudaRuntimeGetVersion')
+    {{endif}}
 
     if __cudaRuntimeGetVersion == NULL:
         with gil:
-            raise RuntimeError(f'Function "cudaRuntimeGetVersion" not found in libcudart.so.13')
+            raise RuntimeError(f'Function "cudaRuntimeGetVersion" not found in {lib.abs_path}')
 
     # Call
     cdef cudaError_t err = cudaSuccess
     err = (<cudaError_t (*)(int*) except ?cudaErrorCallRequiresNewerDriver nogil> __cudaRuntimeGetVersion)(runtimeVersion)
 
     # Unload
+    {{if 'Windows' != platform.system()}}
     dlfcn.dlclose(handle)
+    {{endif}}
 
     # Return
     return err
-    {{endif}}
 {{endif}}

cuda_bindings/tests/test_cudart.py

@@ -9,6 +9,7 @@
 
 import cuda.bindings.driver as cuda
 import cuda.bindings.runtime as cudart
+from cuda import pathfinder
 from cuda.bindings import runtime
 
 
@@ -1400,3 +1401,13 @@ def test_struct_pointer_comparison(target):
     c = target(456)
     assert a != c
     assert hash(a) != hash(c)
+
+
+def test_getLocalRuntimeVersion():
+    try:
+        err, version = cudart.getLocalRuntimeVersion()
+    except pathfinder.DynamicLibNotFoundError:
+        pass
+    else:
+        assertSuccess(err)
+        assert version >= 12000  # CUDA 12.0