Re: [Qemu-devel] [PATCH] eventfd: making it rhread safe

[Alexey Kardashevskiy <aik@ozlabs.ru>]

Ping?

On 02/07/12 05:48, Alexey Kardashevskiy wrote:
> QEMU uses IO handlers to run select() in the main loop. The handlers list is managed by qemu_set_fd_handler() helper which works fine when called from the main thread as it is called not when select() is waiting.
> 
> However sometime we need to update the handlers list from another thread. For that the main loop's select() needs to be restarted with the updated list.
> 
> The patch adds the qemu_notify_event() call to interrupt select() and make wrapping code to restart select() with the updated IO handlers list.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
> 
> ---
>  iohandler.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/iohandler.c b/iohandler.c
> index 3c74de6..dea4355 100644
> --- a/iohandler.c
> +++ b/iohandler.c
> @@ -77,6 +77,7 @@ int qemu_set_fd_handler2(int fd,
>          ioh->fd_write = fd_write;
>          ioh->opaque = opaque;
>          ioh->deleted = 0;
> +        qemu_notify_event();
>      }
>      return 0;
>  }
> 


-- 
Alexey