nptl: Add smoke test for pthread_getcpuclockid failure

Exercise the case where an exited thread will cause
pthread_getcpuclockid to fail.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Florian Weimer <fweimer@redhat.com>

nptl/Makefile

@@ -319,6 +319,7 @@ tests = \
   tst-pthread-defaultattr-free \
   tst-pthread-gdb-attach \
   tst-pthread-gdb-attach-static \
+  tst-pthread-getcpuclockid-invalid \
   tst-pthread-key1-static \
   tst-pthread-timedlock-lockloop \
   tst-pthread_exit-nothreads \

nptl/tst-pthread-getcpuclockid-invalid.c

@@ -0,0 +1,50 @@
+/* Smoke test to verify that pthread_getcpuclockid fails with ESRCH when the
+   thread in question has exited.
+   Copyright the GNU Toolchain Authors.
+   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 <errno.h>
+#include <pthread.h>
+#include <sched.h>
+#include <time.h>
+
+#include <support/check.h>
+#include <support/test-driver.h>
+#include <support/xthread.h>
+
+void *
+thr (void *in)
+{
+  return in;
+}
+
+int
+do_test (void)
+{
+  clockid_t c;
+  pthread_t t = xpthread_create (NULL, thr, NULL);
+
+  int ret = 0;
+  while ((ret = pthread_getcpuclockid (t, &c)) == 0)
+    sched_yield ();
+
+  TEST_COMPARE (ret, ESRCH);
+
+  return 0;
+}
+
+#include <support/test-driver.c>