Fixes for signal handling:

  o Don't call signal handlers with the signal handler access lock
    held.
  o Remove pending signals before calling signal handlers.  If
    pending signals were not removed prior to handling them,
    invocation of the handler could cause the handler to be
    called more than once for the same signal.  Found by: JB
  o When SIGCHLD arrives, wake up all threads in PS_WAIT_WAIT
    (wait4).

PR:		bin/15328
Reviewed by:	jasone

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/libpthread/thread/thr_kern.c b/lib/libpthread/thread/thr_kern.c
index cdb84a5..f69cb41 100644
--- a/lib/libpthread/thread/thr_kern.c
+++ b/lib/libpthread/thread/thr_kern.c
@@ -1076,6 +1076,7 @@ dequeue_signals(void)
 {
 	char	bufr[128];
 	int	i, num;
+	pthread_t pthread;
 
 	/*
 	 * Enter a loop to read and handle queued signals from the
@@ -1096,7 +1097,11 @@ dequeue_signals(void)
 			}
 			else {
 				/* Handle this signal: */
-				_thread_sig_handle((int) bufr[i], NULL);
+				pthread = _thread_sig_handle((int) bufr[i],
+				    NULL);
+				if (pthread != NULL)
+					_thread_sig_deliver(pthread,
+					    (int) bufr[i]);
 			}
 		}
 	}