4 _glapi_check_multithread
5 _glapi_destroy_multithread
8 _glapi_get_dispatch_table_size
9 _glapi_get_proc_address
11 _glapi_get_proc_offset
13 _glapi_noop_enable_warnings
16 _glapi_set_nop_handler
17 _glapi_set_warning_func
18 (optional) _glapi_tls_Context
19 (optional) _glapi_tls_Dispatch