[src/netbsd-9]: src/tests/lib/libc/sys Pull up following revision(s) (request...

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

details:   https://anonhg.NetBSD.org/src/rev/36bdfd51840b
branches:  netbsd-9
changeset: 843365:36bdfd51840b
user:      martin <martin%NetBSD.org@localhost>
date:      Tue Oct 15 18:40:02 2019 +0000

description:
Pull up following revision(s) (requested by kamil in ticket #314):

        tests/lib/libc/sys/t_ptrace_wait.c: revision 1.137

Fix race in t_ptrace_wait* LWP tests

Increment the done variable under a mutex. This variable was updated
non-atomically and sometimes not reaching the expected treshold.

diffstat:

 tests/lib/libc/sys/t_ptrace_wait.c |  7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diffs (34 lines):

diff -r 3e8d9910f686 -r 36bdfd51840b tests/lib/libc/sys/t_ptrace_wait.c
--- a/tests/lib/libc/sys/t_ptrace_wait.c        Tue Oct 15 18:38:39 2019 +0000
+++ b/tests/lib/libc/sys/t_ptrace_wait.c        Tue Oct 15 18:40:02 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_ptrace_wait.c,v 1.131.2.2 2019/10/15 18:34:34 martin Exp $   */
+/*     $NetBSD: t_ptrace_wait.c,v 1.131.2.3 2019/10/15 18:40:02 martin Exp $   */
 
 /*-
  * Copyright (c) 2016, 2017, 2018, 2019 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_ptrace_wait.c,v 1.131.2.2 2019/10/15 18:34:34 martin Exp $");
+__RCSID("$NetBSD: t_ptrace_wait.c,v 1.131.2.3 2019/10/15 18:40:02 martin Exp $");
 
 #include <sys/param.h>
 #include <sys/types.h>
@@ -5432,12 +5432,15 @@
 #define TRACE_THREADS_NUM 100
 
 static volatile int done;
+pthread_mutex_t trace_threads_mtx = PTHREAD_MUTEX_INITIALIZER;
 
 static void *
 trace_threads_cb(void *arg __unused)
 {
 
+       pthread_mutex_lock(&trace_threads_mtx);
        done++;
+       pthread_mutex_unlock(&trace_threads_mtx);
 
        while (done < TRACE_THREADS_NUM)
                sched_yield();