Currently, the signal queue is touched by the thread sig as well as
other threads that call sigaction_worker(). This potentially has
a possibility to destroy the signal queue chain. A possible worst
result may be a self-loop chain which causes infinite loop. With
this patch, lock()/unlock() are introduce to avoid such a situation.
Fixes: 474048c26edf ("* sigproc.cc (pending_signals::add): Just index directly into signal array rather than treating the array as a heap.")
Suggested-by: Corinna Vinschen <corinna@vinschen.de>
Reviewed-by: Corinna Vinschen <corinna@vinschen.de>
Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
496fa7b2ce