CUDA Backend: Use blocking events to avoid 100% CPU core usage (per GPU)

docs/changes.txt

@@ -27,6 +27,7 @@
 ##
 
 - Apple Keychain: Notify the user about the risk of collisions / false positives
+- CUDA Backend: Use blocking events to avoid 100% CPU core usage (per GPU)
 - Startup time: Improved the startup time by avoiding some time intensive operations for skipped devices
 
 ##

src/backend.c

@@ -7831,9 +7831,9 @@ int backend_session_begin (hashcat_ctx_t *hashcat_ctx)
 
     if (device_param->is_cuda == true)
     {
-      if (hc_cuEventCreate (hashcat_ctx, &device_param->cuda_event1, CU_EVENT_DEFAULT) == -1) return -1;
+      if (hc_cuEventCreate (hashcat_ctx, &device_param->cuda_event1, CU_EVENT_BLOCKING_SYNC) == -1) return -1;
 
-      if (hc_cuEventCreate (hashcat_ctx, &device_param->cuda_event2, CU_EVENT_DEFAULT) == -1) return -1;
+      if (hc_cuEventCreate (hashcat_ctx, &device_param->cuda_event2, CU_EVENT_BLOCKING_SYNC) == -1) return -1;
     }
 
     /**