[src/trunk]: src/lib/librumpuser With glibc on ARM kthread_exit() aborts beca...

[pooka <pooka%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/53d63b89b2b8
branches:  trunk
changeset: 334944:53d63b89b2b8
user:      pooka <pooka%NetBSD.org@localhost>
date:      Tue Dec 16 17:00:17 2014 +0000

description:
With glibc on ARM kthread_exit() aborts because pthread_exit() fails
to unwind the stack.  Add a temporary workaround where we simply don't
allow the thread to exit (a kernel thread exit is a relatively uncommon
event in a rump kernel anyway).

diffstat:

 lib/librumpuser/rumpuser_pth.c |  15 +++++++++++++--
 1 files changed, 13 insertions(+), 2 deletions(-)

diffs (36 lines):

diff -r e4fe3f29b084 -r 53d63b89b2b8 lib/librumpuser/rumpuser_pth.c
--- a/lib/librumpuser/rumpuser_pth.c    Tue Dec 16 15:33:22 2014 +0000
+++ b/lib/librumpuser/rumpuser_pth.c    Tue Dec 16 17:00:17 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: rumpuser_pth.c,v 1.43 2014/11/04 19:05:17 pooka Exp $  */
+/*     $NetBSD: rumpuser_pth.c,v 1.44 2014/12/16 17:00:17 pooka Exp $  */
 
 /*
  * Copyright (c) 2007-2010 Antti Kantee.  All Rights Reserved.
@@ -28,7 +28,7 @@
 #include "rumpuser_port.h"
 
 #if !defined(lint)
-__RCSID("$NetBSD: rumpuser_pth.c,v 1.43 2014/11/04 19:05:17 pooka Exp $");
+__RCSID("$NetBSD: rumpuser_pth.c,v 1.44 2014/12/16 17:00:17 pooka Exp $");
 #endif /* !lint */
 
 #include <sys/queue.h>
@@ -104,6 +104,17 @@
 rumpuser_thread_exit(void)
 {
 
+       /*
+        * FIXXXME: with glibc on ARM pthread_exit() aborts because
+        * it fails to unwind the stack.  In the typical case, only
+        * the mountroothook thread will exit and even that's
+        * conditional on vfs being present.
+        */
+#if (defined(__ARMEL__) || defined(__ARMEB__)) && defined(__GLIBC__)
+       for (;;)
+               pause();
+#endif
+
        pthread_exit(NULL);
 }