Copy files from ../librthread in preparation for moving functionality

from libpthread to libc.  No changes to the build yet, just making it
easier to review the substantive diffs.

ok beck@ kettenis@ tedu@

1 files changed, 32 insertions, 0 deletions

diff --git a/lib/libc/thread/rthread_once.c b/lib/libc/thread/rthread_once.c
new file mode 100644
index 00000000000..b8c6ba79161
--- /dev/null
+++ b/lib/libc/thread/rthread_once.c
@@ -0,0 +1,32 @@
+/*	$OpenBSD: rthread_once.c,v 1.1 2017/08/15 06:13:24 guenther Exp $ */
+/*
+ * Copyright (c) 2004,2005 Ted Unangst <tedu@openbsd.org>
+ * All Rights Reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <pthread.h>
+
+int
+pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
+{
+	pthread_mutex_lock(&once_control->mutex);
+	if (once_control->state == PTHREAD_NEEDS_INIT) {
+		init_routine();
+		once_control->state = PTHREAD_DONE_INIT;
+	}
+	pthread_mutex_unlock(&once_control->mutex);
+
+	return (0);
+}