--- /dev/null
+++ Libc/Libc-1439.40.11/tests/netbsd_getenv_thread.c
@@ -0,0 +1,166 @@
+/*	$NetBSD: t_getenv_thread.c,v 1.2 2012/03/15 02:02:23 joerg Exp $ */
+
+/*-
+ * Copyright (c) 2010 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matthias Scheler.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: t_getenv_thread.c,v 1.2 2012/03/15 02:02:23 joerg Exp $");
+
+#include <darwintest.h>
+
+#include <errno.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#define	THREADED_NUM_THREADS	8
+#define	THREADED_NUM_VARS	16
+#define	THREADED_VAR_NAME	"THREADED%zu"
+#define	THREADED_RUN_TIME	10
+
+static void	 *thread_putenv(void *);
+static void	 *thread_setenv(void *);
+static void	 *thread_unsetenv(void *);
+
+static void *
+thread_putenv(void *arg)
+{
+	time_t endtime;
+	size_t i;
+	static char vars[THREADED_NUM_VARS][128];
+
+	for (i = 0; i < THREADED_NUM_VARS; i++) {
+		(void)snprintf(vars[i], sizeof(vars[i]),
+		    THREADED_VAR_NAME "=putenv %ld", i, lrand48());
+	}
+
+	endtime = *(time_t *)arg;
+	do {
+		char name[128];
+
+		i = lrand48() % THREADED_NUM_VARS;
+		(void)strlcpy(name, vars[i], sizeof(name));
+		*strchr(name, '=') = '\0';
+
+		T_QUIET; T_ASSERT_POSIX_ZERO(unsetenv(name), NULL);
+		T_QUIET; T_ASSERT_POSIX_ZERO(putenv(vars[i]), NULL);
+	} while (time(NULL) < endtime);
+
+	return NULL;
+}
+
+static void *
+thread_setenv(void *arg)
+{
+	time_t endtime;
+
+	endtime = *(time_t *)arg;
+	do {
+		size_t i;
+		char name[32], value[64];
+
+		i = lrand48() % THREADED_NUM_VARS;
+		(void)snprintf(name, sizeof(name), THREADED_VAR_NAME, i);
+		(void)snprintf(value, sizeof(value), "setenv %ld", lrand48());
+
+		T_QUIET; T_ASSERT_POSIX_ZERO(setenv(name, value, 1), NULL);
+	} while (time(NULL) < endtime);
+
+	return NULL;
+}
+
+static void *
+thread_unsetenv(void *arg)
+{
+	time_t endtime;
+
+	endtime = *(time_t *)arg;
+	do {
+		size_t i;
+		char name[32];
+
+		i = lrand48() % THREADED_NUM_VARS;
+		(void)snprintf(name, sizeof(name), THREADED_VAR_NAME, i);
+
+		T_QUIET; T_ASSERT_POSIX_ZERO(unsetenv(name), NULL);
+	} while (time(NULL) < endtime);
+
+	return NULL;
+}
+
+T_DECL(putenv_thread, "Test concurrent access by putenv(3)")
+{
+	pthread_t threads[THREADED_NUM_THREADS];
+	time_t endtime = time(NULL) + THREADED_RUN_TIME;
+
+	for (int i = 0; i < THREADED_NUM_THREADS; i++) {
+		T_QUIET; T_ASSERT_POSIX_ZERO(
+				pthread_create(&threads[i], NULL, thread_putenv, &endtime),
+				NULL);
+	}
+	for (int i = 0; i < THREADED_NUM_THREADS; i++) {
+		T_QUIET; T_ASSERT_POSIX_ZERO(pthread_join(threads[i], NULL), NULL);
+	}
+	T_PASS("putenv_thread() completed successfully");
+}
+
+T_DECL(setenv_thread, "Test concurrent access by setenv(3)")
+{
+	pthread_t threads[THREADED_NUM_THREADS];
+	time_t endtime = time(NULL) + THREADED_RUN_TIME;
+
+	for (int i = 0; i < THREADED_NUM_THREADS; i++) {
+		T_QUIET; T_ASSERT_POSIX_ZERO(
+				pthread_create(&threads[i], NULL, thread_setenv, &endtime),
+				NULL);
+	}
+	for (int i = 0; i < THREADED_NUM_THREADS; i++) {
+		T_QUIET; T_ASSERT_POSIX_ZERO(pthread_join(threads[i], NULL), NULL);
+	}
+	T_PASS("setenv_thread() completed successfully");
+}
+
+T_DECL(unsetenv_thread, "Test unsetenv(3) with threads",
+		T_META_ENVVAR("MallocStackLogging=lite"))
+{
+	pthread_t threads[THREADED_NUM_THREADS];
+	time_t endtime = time(NULL) + THREADED_RUN_TIME;
+
+	for (int i = 0; i < THREADED_NUM_THREADS; i++) {
+		T_QUIET; T_ASSERT_POSIX_ZERO(
+				pthread_create(&threads[i], NULL, thread_unsetenv, &endtime),
+				NULL);
+	}
+	for (int i = 0; i < THREADED_NUM_THREADS; i++) {
+		T_QUIET; T_ASSERT_POSIX_ZERO(pthread_join(threads[i], NULL), NULL);
+	}
+	T_PASS("unsetenv_thread() completed successfully");
+}
+