nptl: Add pthread_clockjoin_np

Introduce pthread_clockjoin_np as a version of pthread_timedjoin_np that
accepts a clockid_t parameter to indicate which clock the timeout should be
measured against. This mirrors the recently-added POSIX-proposed "clock"
wait functions.

Checked on x86_64-linux-gnu.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/nptl/pthread_clockjoin.c b/nptl/pthread_clockjoin.c
new file mode 100644
index 0000000000..7c8c3ac564
--- /dev/null
+++ b/nptl/pthread_clockjoin.c
@@ -0,0 +1,29 @@
+/* Join with a terminated thread using an specific clock.
+   Copyright (C) 2019 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
+   <http://www.gnu.org/licenses/>.  */
+
+#include "pthreadP.h"
+
+int
+__pthread_clockjoin_np (pthread_t threadid, void **thread_return,
+			clockid_t clockid,
+			const struct timespec *abstime)
+{
+  return __pthread_clockjoin_ex (threadid, thread_return,
+                                 clockid, abstime, true);
+}
+weak_alias (__pthread_clockjoin_np, pthread_clockjoin_np)