--- /dev/null
+++ Libc/Libc-498/pthreads/pthread_impl.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2000-2003 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#ifndef _PTHREAD_IMPL_H_
+#define _PTHREAD_IMPL_H_
+/*
+ * Internal implementation details
+ */
+
+/* This whole header file will disappear, so don't depend on it... */
+
+#ifndef __POSIX_LIB__
+
+/*
+ * [Internal] data structure signatures
+ */
+#define _PTHREAD_MUTEX_SIG_init		0x32AAABA7
+#define _PTHREAD_COND_SIG_init		0x3CB0B1BB
+#define _PTHREAD_ONCE_SIG_init		0x30B1BCBA
+#define _PTHREAD_RWLOCK_SIG_init    0x2DA8B3B4
+/*
+ * POSIX scheduling policies
+ */
+#define SCHED_OTHER                1
+#define SCHED_FIFO                 4
+#define SCHED_RR                   2
+
+#define __SCHED_PARAM_SIZE__       4
+
+#endif /* __POSIX_LIB__ */
+
+#endif /* _PTHREAD_IMPL_H_ */