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Make qemu_shutdown_requested signal-safe

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qemu_shutdown_requested may be interrupted by qemu_system_killed. If the
latter sets shutdown_requested after qemu_shutdown_requested has read it
but before it was cleared, the shutdown event is lost. Fix this by using
atomic_xchg.

This provides a different fix for the problem which commit 15124e142
attempts to deal with. That commit breaks use of ^C to drop into gdb,
and so this approach is better (and 15124e142 can be reverted).

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
[PMM: commit message tweak]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Jan Kiszka 2014-10-27 14:05:10 +00:00 • committed by Peter Maydell
parent ff0d48768b
commit 817ef04db2
1 changed files with 1 additions and 3 deletions
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4
vl.c
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@ -1609,9 +1609,7 @@ int qemu_reset_requested_get(void)
static int qemu_shutdown_requested(void)
{
int r = shutdown_requested;
shutdown_requested = 0;
return r;
return atomic_xchg(&shutdown_requested, 0);
}
static void qemu_kill_report(void)