nptl: Convert tst-setuid2 to test-driver

diff --git a/nptl/tst-setuid2.c b/nptl/tst-setuid2.c
index aff3b1a97d..9b7799991c 100644
--- a/nptl/tst-setuid2.c
+++ b/nptl/tst-setuid2.c
@@ -20,6 +20,7 @@ 
 #include <signal.h>
 #include <stdbool.h>
 #include <stdio.h>
+#include <support/xthread.h>
 #include <sys/syscall.h>
 #include <unistd.h>
 
@@ -36,30 +37,21 @@  static pthread_cond_t cond_recv;
 static void *
 thread_func (void *ctx __attribute__ ((unused)))
 {
-  int ret = pthread_mutex_lock (&mutex);
-  if (ret != 0)
-    FAIL ("pthread_mutex_lock (thread): %d", ret);
-
+  xpthread_mutex_lock (&mutex);
   while (true)
     {
       if (func_sent != NULL)
 	{
 	  void (*func) (void) = func_sent;
-	  ret = pthread_mutex_unlock (&mutex);
-	  if (ret != 0)
-	    FAIL ("pthread_mutex_unlock (thread): %d", ret);
+	  xpthread_mutex_unlock (&mutex);
+
 	  func ();
-	  ret = pthread_mutex_lock (&mutex);
-	  if (ret != 0)
-	    FAIL ("pthread_mutex_lock (thread): %d", ret);
+
+	  xpthread_mutex_lock (&mutex);
 	  func_sent = NULL;
-	  ret = pthread_cond_signal (&cond_recv);
-	  if (ret != 0)
-	    FAIL ("pthread_cond_signal (recv): %d", ret);
+	  xpthread_cond_signal (&cond_recv);
 	}
-      ret = pthread_cond_wait (&cond_send, &mutex);
-      if (ret != 0)
-	FAIL ("pthread_cond_wait (send): %d", ret);
+      xpthread_cond_wait (&cond_send, &mutex);
     }
   return NULL;
 }
@@ -67,31 +59,18 @@  thread_func (void *ctx __attribute__ ((unused)))
 static void
 run_on_thread (void (*func) (void))
 {
-  int ret = pthread_mutex_lock (&mutex);
-  if (ret != 0)
-    FAIL ("pthread_mutex_lock (%s): %d", __func__, ret);
+  xpthread_mutex_lock (&mutex);
   func_sent = func;
-  ret = pthread_mutex_unlock (&mutex);
-  if (ret != 0)
-    FAIL ("pthread_mutex_unlock (%s): %d", __func__, ret);
+  xpthread_mutex_unlock (&mutex);
 
-  ret = pthread_cond_signal (&cond_send);
-  if (ret != 0)
-    FAIL ("pthread_mutex_lock (%s): %d", __func__, ret);
-
-  ret = pthread_mutex_lock (&mutex);
-  if (ret != 0)
-    FAIL ("pthread_mutex_lock (%s): %d", __func__, ret);
+  xpthread_cond_signal (&cond_send);
 
+  xpthread_mutex_lock (&mutex);
   while (func_sent != NULL)
     {
-      ret = pthread_cond_wait (&cond_recv, &mutex);
-      if (ret != 0)
-	FAIL ("pthread_mutex_wait (%s): %d", __func__, ret);
+      xpthread_cond_wait (&cond_recv, &mutex);
     }
-  ret = pthread_mutex_unlock (&mutex);
-  if (ret != 0)
-    FAIL ("pthread_mutex_unlock (%s): %d", __func__, ret);
+  xpthread_mutex_unlock (&mutex);
 }
 
 static void
@@ -141,5 +120,4 @@  do_test (void)
   return 0;
 }
 
-#define TEST_FUNCTION do_test ()
-#include "../test-skeleton.c"
+#include <support/test-driver.c>
diff --git a/support/Makefile b/support/Makefile
index 551d02941f..4046b12fbd 100644
--- a/support/Makefile
+++ b/support/Makefile
@@ -159,6 +159,7 @@  libsupport-routines = \
   xpthread_cancel \
   xpthread_check_return \
   xpthread_cond_wait \
+  xpthread_cond_signal \
   xpthread_create \
   xpthread_detach \
   xpthread_join \
diff --git a/support/xpthread_cond_signal.c b/support/xpthread_cond_signal.c
new file mode 100644
index 0000000000..51d04d2a66
--- /dev/null
+++ b/support/xpthread_cond_signal.c
@@ -0,0 +1,26 @@ 
+/* pthread_cond_signal with error checking.
+   Copyright (C) 2016-2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <support/xthread.h>
+
+void
+xpthread_cond_signal (pthread_cond_t *cond)
+{
+  xpthread_check_return
+    ("pthread_cond_signal", pthread_cond_signal (cond));
+}
diff --git a/support/xthread.h b/support/xthread.h
index af06715f46..ae09649325 100644
--- a/support/xthread.h
+++ b/support/xthread.h
@@ -62,6 +62,7 @@  void xpthread_mutex_consistent (pthread_mutex_t *);
 void xpthread_spin_lock (pthread_spinlock_t *lock);
 void xpthread_spin_unlock (pthread_spinlock_t *lock);
 void xpthread_cond_wait (pthread_cond_t * cond, pthread_mutex_t * mutex);
+void xpthread_cond_signal (pthread_cond_t *cond);
 pthread_t xpthread_create (pthread_attr_t *attr,
                            void *(*thread_func) (void *), void *closure);
 void xpthread_detach (pthread_t thr);