[RFC,12/13] support: implement xpthread key create/delete (v3)

diff --git a/ChangeLog.old/ChangeLog.19 b/ChangeLog.old/ChangeLog.19
index 07c6aff585..ae2e4af636 100644
--- a/ChangeLog.old/ChangeLog.19
+++ b/ChangeLog.old/ChangeLog.19
@@ -1,3 +1,11 @@ 
+2019-12-17  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+
+	* support/Makefile: Add xpthread_key_create and xpthread_key_delete.
+	* support/xthread.h: Add prototype for xpthread_key_create and
+	xpthread_key_delete.
+	* support/xpthread_key_create.c: New file.
+	* support/xpthread_key_delete.c: New file.
+
 2019-12-17  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 
 	* sysdeps/unix/sysv/linux/sched_getcpu.c: use rseq cpu_id TLS on
diff --git a/support/Makefile b/support/Makefile
index 23c6d74627..affc598c65 100644
--- a/support/Makefile
+++ b/support/Makefile
@@ -127,6 +127,8 @@  libsupport-routines = \
   xpthread_create \
   xpthread_detach \
   xpthread_join \
+  xpthread_key_create \
+  xpthread_key_delete \
   xpthread_mutex_consistent \
   xpthread_mutex_destroy \
   xpthread_mutex_init \
diff --git a/support/xpthread_key_create.c b/support/xpthread_key_create.c
new file mode 100644
index 0000000000..fb5a89ab3a
--- /dev/null
+++ b/support/xpthread_key_create.c
@@ -0,0 +1,25 @@ 
+/* pthread_key_create with error checking.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+
+   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 <support/xthread.h>
+
+void
+xpthread_key_create (pthread_key_t *key, void (*destr_function) (void *))
+{
+  xpthread_check_return ("pthread_key_create",
+                         pthread_key_create (key, destr_function));
+}
diff --git a/support/xpthread_key_delete.c b/support/xpthread_key_delete.c
new file mode 100644
index 0000000000..423ff4584d
--- /dev/null
+++ b/support/xpthread_key_delete.c
@@ -0,0 +1,24 @@ 
+/* pthread_key_delete with error checking.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+
+   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 <support/xthread.h>
+
+void
+xpthread_key_delete (pthread_key_t key)
+{
+  xpthread_check_return ("pthread_key_delete", pthread_key_delete (key));
+}
diff --git a/support/xthread.h b/support/xthread.h
index f39720cb23..4be86b39a0 100644
--- a/support/xthread.h
+++ b/support/xthread.h
@@ -95,6 +95,8 @@  void xpthread_rwlock_wrlock (pthread_rwlock_t *rwlock);
 void xpthread_rwlock_rdlock (pthread_rwlock_t *rwlock);
 void xpthread_rwlock_unlock (pthread_rwlock_t *rwlock);
 void xpthread_rwlock_destroy (pthread_rwlock_t *rwlock);
+void xpthread_key_create (pthread_key_t *key, void (*destr_function) (void *));
+void xpthread_key_delete (pthread_key_t key);
 
 __END_DECLS