* [Qemu-devel] [PATCH] Fix signal handling when io-thread is disabled
@ 2011-06-14 3:46 Alexandre Raymond
2011-06-14 6:05 ` Jan Kiszka
0 siblings, 1 reply; 3+ messages in thread
From: Alexandre Raymond @ 2011-06-14 3:46 UTC (permalink / raw)
To: qemu-devel
Cc: Alexandre Raymond, pbonzini, andreas.faerber, agraf, jan.kiszka
This fix effectively blocks, in the main thread, the signals handled
by signalfd or the compatibility signal thread.
This way, such signals are received synchronously in the main thread
through sigfd_handler() instead of triggering the signal handler
directly, asynchronously.
Signed-off-by: Alexandre Raymond <cerbere@gmail.com>
---
cpus.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/cpus.c b/cpus.c
index 4ab76f0..b6366b5 100644
--- a/cpus.c
+++ b/cpus.c
@@ -411,6 +411,7 @@ static int qemu_signal_init(void)
sigaddset(&set, SIGIO);
sigaddset(&set, SIGALRM);
}
+ pthread_sigmask(SIG_BLOCK, &set, NULL);
#endif
sigfd = qemu_signalfd(&set);
--
1.7.5
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [Qemu-devel] [PATCH] Fix signal handling when io-thread is disabled
2011-06-14 3:46 [Qemu-devel] [PATCH] Fix signal handling when io-thread is disabled Alexandre Raymond
@ 2011-06-14 6:05 ` Jan Kiszka
2011-06-14 14:10 ` Alexandre Raymond
0 siblings, 1 reply; 3+ messages in thread
From: Jan Kiszka @ 2011-06-14 6:05 UTC (permalink / raw)
To: Alexandre Raymond; +Cc: pbonzini, andreas.faerber, qemu-devel, agraf
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On 2011-06-14 05:46, Alexandre Raymond wrote:
> This fix effectively blocks, in the main thread, the signals handled
> by signalfd or the compatibility signal thread.
>
> This way, such signals are received synchronously in the main thread
> through sigfd_handler() instead of triggering the signal handler
> directly, asynchronously.
>
> Signed-off-by: Alexandre Raymond <cerbere@gmail.com>
> ---
> cpus.c | 1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/cpus.c b/cpus.c
> index 4ab76f0..b6366b5 100644
> --- a/cpus.c
> +++ b/cpus.c
> @@ -411,6 +411,7 @@ static int qemu_signal_init(void)
> sigaddset(&set, SIGIO);
> sigaddset(&set, SIGALRM);
> }
> + pthread_sigmask(SIG_BLOCK, &set, NULL);
> #endif
>
> sigfd = qemu_signalfd(&set);
Good catch. Probably remained unnoticed as most of us have signalfd
support on their boxes so that the window for async delivery was rather
small.
But please pull the now common pthread_sigmask out of the #ifdef.
Jan
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2011-06-14 3:46 [Qemu-devel] [PATCH] Fix signal handling when io-thread is disabled Alexandre Raymond
2011-06-14 6:05 ` Jan Kiszka
2011-06-14 14:10 ` Alexandre Raymond
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