1 files changed, 10 insertions, 1 deletions
diff --git a/winsup/cygwin/sigproc.cc b/winsup/cygwin/sigproc.cc
index 906dc6a35..c65e7bb37 100644
--- a/winsup/cygwin/sigproc.cc
+++ b/winsup/cygwin/sigproc.cc
@@ -553,7 +553,16 @@ sig_send (_pinfo *p, siginfo_t& si, _cygtls *tls)
 	}
       VerifyHandle (sendsig);
       if (!communing)
-	CloseHandle (hp);
+	{
+	  CloseHandle (hp);
+	  DWORD flag = PIPE_NOWAIT;
+	  /* Set PIPE_NOWAIT here to avoid blocking when sending a signal.
+	     (Yes, I know MSDN says not to use this)
+	     We can't ever block here because it causes a deadlock when
+	     debugging with gdb.  */
+	  BOOL res = SetNamedPipeHandleState (sendsig, &flag, NULL, NULL);
+	  sigproc_printf ("%d = SetNamedPipeHandleState (%y, PIPE_NOWAIT, NULL, NULL)", res, sendsig);
+	}
       else
 	{
 	  si._si_commune._si_process_handle = hp;