From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gdb-patches-return-103535-listarch-gdb-patches=sources.redhat.com@sourceware.org>
Received: (qmail 23632 invoked by alias); 20 Jul 2013 10:00:22 -0000
Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm
Precedence: bulk
List-Id: <gdb-patches.sourceware.org>
List-Subscribe: <mailto:gdb-patches-subscribe@sourceware.org>
List-Archive: <http://sourceware.org/ml/gdb-patches/>
List-Post: <mailto:gdb-patches@sourceware.org>
List-Help: <mailto:gdb-patches-help@sourceware.org>, <http://sourceware.org/ml/#faqs>
Sender: gdb-patches-owner@sourceware.org
Received: (qmail 23617 invoked by uid 89); 20 Jul 2013 10:00:21 -0000
X-Spam-SWARE-Status: No, score=-1.0 required=5.0 tests=AWL,BAYES_40,FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,RCVD_IN_HOSTKARMA_YE,RDNS_NONE,SPF_PASS autolearn=no version=3.3.1
Received: from Unknown (HELO mail-ob0-f176.google.com) (209.85.214.176)    by sourceware.org (qpsmtpd/0.84/v0.84-167-ge50287c) with ESMTP; Sat, 20 Jul 2013 10:00:20 +0000
Received: by mail-ob0-f176.google.com with SMTP id v19so6341838obq.21        for <gdb-patches@sourceware.org>; Sat, 20 Jul 2013 03:00:13 -0700 (PDT)
X-Received: by 10.182.52.202 with SMTP id v10mr15143910obo.73.1374314413269; Sat, 20 Jul 2013 03:00:13 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.60.116.101 with HTTP; Sat, 20 Jul 2013 02:59:33 -0700 (PDT)
From: Hui Zhu <teawater@gmail.com>
Date: Sat, 20 Jul 2013 10:00:00 -0000
Message-ID: <CANFwon2cWyxzWi+Sqfk6mUK0ZCWQRisMmGWe6mxPMgDLTV_j2g@mail.gmail.com>
Subject: [PATCH] Fix PR 12702 - gdb can hang waiting for thread group leader (gdbserver)
To: gdb-patches ml <gdb-patches@sourceware.org>
Content-Type: text/plain; charset=ISO-8859-1
X-SW-Source: 2013-07/txt/msg00475.txt.bz2

Hi,

I got a issue with leader-exit.exp will hang with target_board=native-gdbserver.
I found the reason is gdbserver still have this issue.  So I post a
patch for gdbserver.

Thanks,
Hui

2013-07-20  Hui Zhu  <hui@codesourcery.com>

	PR gdb/12702
	* linux-low.c (my_waitpid): Check if pid is exiting.

--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -423,6 +423,15 @@ my_waitpid (int pid, int *status, int fl
 	      if (wnohang)
 		break;

+	      /* If just wait PID and it is exiting, sigsuspend will
+	         hang.  So check before call it.  */
+	      if (pid > 0 && linux_proc_pid_is_zombie (pid))
+		{
+		  *status = 0;
+		  ret = pid;
+		  break;
+		}
+
 	      if (debug_threads)
 		fprintf (stderr, "blocking\n");