[Bug dap/30680] [gdb/dap] ThreadSanitizer: data race gdbsupport/event-pipe.h:44 in event_pipe::is_open() const

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30680

--- Comment #9 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #6)
> diff --git a/gdb/run-on-main-thread.c b/gdb/run-on-main-thread.c
> index c7d9de0afc8..f9388e33633 100644
> --- a/gdb/run-on-main-thread.c
> +++ b/gdb/run-on-main-thread.c
> @@ -94,12 +94,27 @@ run_on_main_thread (std::function<void ()> &&func)
>    serial_event_set (runnable_event);
>  }
>  
> +#if CXX_STD_THREAD
> +static void
> +initialize_main_thread_var (void)
> +{
> +  static bool initialized = false;
> +
> +  if (initialized)
> +    return;
> +  initialized = true;
> +
> +  main_thread = std::this_thread::get_id ();
> +}
> +#endif
> +
>  /* See run-on-main-thread.h.  */
>  
>  bool
>  is_main_thread ()
>  {
>  #if CXX_STD_THREAD
> +  initialize_main_thread_var ();
>    return std::this_thread::get_id () == main_thread;
>  #else--
>    return true;
> @@ -111,7 +126,7 @@ void
>  _initialize_run_on_main_thread ()
>  {
>  #if CXX_STD_THREAD
> -  main_thread = std::this_thread::get_id ();
> +  initialize_main_thread_var ();
>  #endif
>    runnable_event = make_serial_event ();
>    add_file_handler (serial_event_fd (runnable_event), run_events, nullptr,
> ...

Submitted this bit here (
https://sourceware.org/pipermail/gdb-patches/2023-July/201190.html ).

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