1 files changed, 57 insertions, 0 deletions
diff --git a/lib/libpthread/pthreads/pthread_once.c b/lib/libpthread/pthreads/pthread_once.c
new file mode 100644
index 000000000000..fe791440eda3
--- /dev/null
+++ b/lib/libpthread/pthreads/pthread_once.c
@@ -0,0 +1,57 @@
+/* ==== pthread_once.c =======================================================
+ * Copyright (c) 1993, 1994 by Chris Provenzano, proven@mit.edu
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *  This product includes software developed by Chris Provenzano.
+ * 4. The name of Chris Provenzano may not be used to endorse or promote 
+ *	  products derived from this software without specific prior written
+ *	  permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL CHRIS PROVENZANO BE LIABLE FOR ANY 
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE.
+ *
+ * Description : pthread_once function.
+ *
+ *  1.00 93/12/12 proven
+ *      -Started coding this file.
+ */
+
+#include <pthread.h>
+
+/* ==========================================================================
+ * pthread_once()
+ */
+static pthread_mutex_t __pthread_once_mutex =  PTHREAD_MUTEX_INITIALIZER;
+
+int pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
+{
+	/* Check first for speed */
+	if (*once_control == PTHREAD_ONCE_INIT) {
+		pthread_mutex_lock(&__pthread_once_mutex);
+		if (*once_control == PTHREAD_ONCE_INIT) {
+			init_routine();
+			(*once_control)++;
+		}
+		pthread_mutex_unlock(&__pthread_once_mutex);
+	}
+	return(OK);
+}