Il 12/10/2012 18:26, Richard Henderson ha scritto:
> Older glibc (RHEL 5.x, Debian 5.x) does not have the _sigev_un._tid
> member in its structure definition, while the accompanying kernel
> headers do define SIGEV_THREAD_ID. We need configure to check for
> both before using it.
>
> Cc: Paolo Bonzini <pbonz...@redhat.com>
> Cc: Anthony Liguori <aligu...@us.ibm.com>
> Signed-off-by: Richard Henderson <r...@twiddle.net>
> ---
> configure | 21 +++++++++++++++++++++
> qemu-timer.c | 4 ++--
> 2 files changed, 23 insertions(+), 2 deletions(-)
>
> FWIW, RHEL 5 is the last release for ia64. And for whatever reason,
> the ultrasparc in the gcc compile farm is still running Lenny. I've
> been hacking around this for some time, and now finally got around to
> submitting a proper patch for it.
Reviewed-by: Paolo Bonzini <pbonz...@redhat.com>
>
>
> r~
>
>
> diff --git a/configure b/configure
> index c4a7837..78d8819 100755
> --- a/configure
> +++ b/configure
> @@ -2841,6 +2841,23 @@ if compile_prog "" "" ; then
> fi
>
> ##########################################
> +# check if we have usable SIGEV_THREAD_ID
> +
> +sigev_thread_id=no
> +cat > $TMPC << EOF
> +#include <signal.h>
> +int main(void) {
> + struct sigevent ev;
> + ev.sigev_notify = SIGEV_THREAD_ID;
> + ev._sigev_un._tid = 0;
> + return 0;
> +}
> +EOF
> +if compile_prog "" "" ; then
> + sigev_thread_id=yes
> +fi
> +
> +##########################################
> # check if trace backend exists
>
> $python "$source_path/scripts/tracetool.py" "--backend=$trace_backend"
> --check-backend > /dev/null 2> /dev/null
> @@ -3186,6 +3203,7 @@ echo "preadv support $preadv"
> echo "fdatasync $fdatasync"
> echo "madvise $madvise"
> echo "posix_madvise $posix_madvise"
> +echo "sigev_thread_id $sigev_thread_id"
> echo "uuid support $uuid"
> echo "libcap-ng support $cap_ng"
> echo "vhost-net support $vhost_net"
> @@ -3469,6 +3487,9 @@ fi
> if test "$posix_madvise" = "yes" ; then
> echo "CONFIG_POSIX_MADVISE=y" >> $config_host_mak
> fi
> +if test "$sigev_thread_id" = "yes" ; then
> + echo "CONFIG_SIGEV_THREAD_ID=y" >> $config_host_mak
> +fi
>
> if test "$spice" = "yes" ; then
> echo "CONFIG_SPICE=y" >> $config_host_mak
> diff --git a/qemu-timer.c b/qemu-timer.c
> index 908a103..ede84ff 100644
> --- a/qemu-timer.c
> +++ b/qemu-timer.c
> @@ -494,12 +494,12 @@ static int dynticks_start_timer(struct qemu_alarm_timer
> *t)
> memset(&ev, 0, sizeof(ev));
> ev.sigev_value.sival_int = 0;
> ev.sigev_notify = SIGEV_SIGNAL;
> -#ifdef SIGEV_THREAD_ID
> +#ifdef CONFIG_SIGEV_THREAD_ID
> if (qemu_signalfd_available()) {
> ev.sigev_notify = SIGEV_THREAD_ID;
> ev._sigev_un._tid = qemu_get_thread_id();
> }
> -#endif /* SIGEV_THREAD_ID */
> +#endif /* CONFIG_SIGEV_THREAD_ID */
> ev.sigev_signo = SIGALRM;
>
> if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) {
>
