Using destructor to close MMD libraries

Author: Tyler Zhao

src/acl_hal_mmd.cpp

@@ -455,6 +455,25 @@ static void my_dlclose(void *library) {
 #endif
 }
 
+static void my_dlclose_no_assert(void *library) {
+#ifdef _WIN32
+  FreeLibrary((HMODULE)library);
+#else
+  dlclose(library);
+#endif
+}
+
+typedef struct my_dl_wrapper {
+  void* handle;
+  my_dl_wrapper(void* handle) { 
+    this->handle = handle; 
+  }
+  ~my_dl_wrapper() { 
+    my_dlclose_no_assert(this->handle); 
+  }
+} my_dl_wrapper;
+std::vector<std::unique_ptr<my_dl_wrapper>> mmd_libs;
+
 cl_bool l_load_board_functions(acl_mmd_dispatch_t *mmd_dispatch,
                                const char *library_name, void *mmd_library,
                                char *error_msg) {
@@ -630,7 +649,7 @@ cl_bool l_load_single_board_library(const char *library_name,
     ++num_boards_found;
   }
 
-  my_dlclose(mmd_library);
+  mmd_libs.push_back(std::make_unique<my_dl_wrapper>(mmd_library));
   return CL_TRUE;
 }