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Re: [Qemu-devel] [PATCH] eventfd: making it rhread safe
From: |
Alexey Kardashevskiy |
Subject: |
Re: [Qemu-devel] [PATCH] eventfd: making it rhread safe |
Date: |
Mon, 09 Jul 2012 13:10:50 +1000 |
User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:13.0) Gecko/20120614 Thunderbird/13.0.1 |
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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 <address@hidden>
> Reviewed-by: Paolo Bonzini <address@hidden>
>
> ---
> 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
Re: [Qemu-devel] QEMU question: is eventfd not thread safe?, Benjamin Herrenschmidt, 2012/07/01
Re: [Qemu-devel] QEMU question: is eventfd not thread safe?, Paolo Bonzini, 2012/07/01
- Re: [Qemu-devel] QEMU question: is eventfd not thread safe?, Alexey Kardashevskiy, 2012/07/01
- Re: [Qemu-devel] [PATCH] eventfd: making it rhread safe, Michael S. Tsirkin, 2012/07/18
- [Qemu-devel] [PATCH] eventfd: making it thread safe, Alexey Kardashevskiy, 2012/07/18
- Re: [Qemu-devel] [PATCH] eventfd: making it thread safe, Michael S. Tsirkin, 2012/07/18
- Re: [Qemu-devel] [PATCH] eventfd: making it thread safe, Alexey Kardashevskiy, 2012/07/18
[Qemu-devel] [PATCH] eventfd: making it thread safe, Alexey Kardashevskiy, 2012/07/18