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authorRoland McGrath <roland@redhat.com>2008-07-25 19:45:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-26 12:00:09 -0700
commitb787f7ba677840da16a2228c16571ce8a1fcb799 (patch)
treeb1838c4ae7f38c00efc2375871a255275500f245 /kernel/signal.c
parent2b2a1ff64afbadac842bbc58c5166962cf4f7664 (diff)
downloadblackbird-op-linux-b787f7ba677840da16a2228c16571ce8a1fcb799.tar.gz
blackbird-op-linux-b787f7ba677840da16a2228c16571ce8a1fcb799.zip
tracehook: force signal_pending()
This defines a new hook tracehook_force_sigpending() that lets tracing code decide to force TIF_SIGPENDING on in recalc_sigpending(). This is not used yet, so it compiles away to nothing for now. It lays the groundwork for new tracing code that can interrupt a task synthetically without actually sending a signal. Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Reviewed-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/signal.c')
-rw-r--r--kernel/signal.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index 0e862d3130ff..954f77d7e3bc 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -134,7 +134,9 @@ void recalc_sigpending_and_wake(struct task_struct *t)
void recalc_sigpending(void)
{
- if (!recalc_sigpending_tsk(current) && !freezing(current))
+ if (unlikely(tracehook_force_sigpending()))
+ set_thread_flag(TIF_SIGPENDING);
+ else if (!recalc_sigpending_tsk(current) && !freezing(current))
clear_thread_flag(TIF_SIGPENDING);
}
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