guard from calling eventDestroy on NULL cuda events

Author: doocman

taskflow/cuda/cuda_stream.hpp

@@ -185,7 +185,9 @@ struct cudaEventCreator {
 */
 struct cudaEventDeleter {
   void operator () (cudaEvent_t event) const {
-    cudaEventDestroy(event);
+    if (event != nullptr) {
+      cudaEventDestroy(event);
+    }
   }
 };
 

unittests/cuda/CMakeLists.txt

@@ -15,6 +15,7 @@ list(APPEND TF_CUDA_UNITTESTS
   test_cuda_merge
   test_cuda_basic_updates
   test_cuda_capturer_optimizer
+  test_cuda_capture
 
   #cuda_algorithms
   #cuda_algorithm_updates

unittests/cuda/test_cuda_capture.cu

@@ -0,0 +1,18 @@
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+
+#include <doctest.h>
+#include <taskflow/taskflow.hpp>
+#include <taskflow/cuda/cudaflow.hpp>
+
+void __global__ testKernel() {}
+
+TEST_CASE("cudaFlowCapturer.noEventError") {
+  tf::cudaFlow f;
+  f.capture([](tf::cudaFlowCapturer& cpt) {
+    cpt.on([] (cudaStream_t stream) {
+      testKernel<<<256,256,0,stream>>>();
+    });
+    REQUIRE((cudaGetLastError() == cudaSuccess));
+  });
+  REQUIRE((cudaGetLastError() == cudaSuccess));
+}