--- /dev/null
+++ Libc/Libc-391/threads/cthread_internals.h
@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 1999 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@
+ */
+/* 
+ * Mach Operating System
+ * Copyright (c) 1989 Carnegie-Mellon University
+ * All rights reserved.  The CMU software License Agreement specifies
+ * the terms and conditions for use and redistribution.
+ */
+
+/*
+ * HISTORY
+ * 08-Mar-90  Avadis Tevanian, Jr. (avie) at NeXT
+ *	Added errno field to cproc structure.
+ *
+ */
+
+/*
+ * cthread_internals.h - by Eric Cooper
+ *
+ * Private definitions for the C Threads implementation.
+ *
+ * The cproc structure is used for different implementations
+ * of the basic schedulable units that execute cthreads.
+ *
+ *	MTHREAD		MACH threads; single address space,
+ *			kernel-mode preemptive scheduling
+ */
+#include <assert.h>
+#include <mach/mach.h>
+#include <mach/mach_error.h>
+
+/*
+ * Low-level thread implementation.
+ * This structure must agree with struct ur_cthread in cthreads.h
+ */
+typedef struct cproc {
+	struct cproc *next;	 /* for lock, condition, and ready queues */
+	struct cproc *incarnation;	/* for cthread_self() */
+	int state;
+	mach_port_t reply_port;		/* for mig_get_reply_port() */
+
+	mach_port_t wait_port;
+
+	int id;
+	struct cproc *link;		/* so all cprocs can be found
+					   after a fork() */
+	int flags;
+
+	unsigned int stack_base;
+	unsigned int stack_size;
+	int	error;
+
+} *cproc_t;
+
+#define	NO_CPROC		((cproc_t) 0)
+#define	cproc_self()		((cproc_t) ur_cthread_self())
+extern void cthread_set_self(cproc_t p);
+
+/*
+ * Possible cproc states.
+ */
+#define	CPROC_RUNNING		0
+#define	CPROC_SPINNING		1
+#define	CPROC_BLOCKED		2
+
+/*
+ * The cproc flag bits.
+ */
+#define CPROC_INITIAL_STACK	0x1
+#define	CPROC_NOCACHE_THREAD	/* Don't try to cache this cthread on exit */
+
+/*
+ * C Threads imports:
+ */
+#ifdef __STRICT_BSD__
+extern char *malloc();
+#endif /* __STRICT_BSD__ */
+
+/*
+ * Mach imports:
+ */
+extern void mach_error();
+
+/*
+ * C library imports:
+ */
+#ifdef __STRICT_BSD__
+extern exit();
+#else
+#include <stdlib.h>
+#endif /* __STRICT_BSD__ */
+
+/*
+ * Macro for MACH kernel calls.
+ */
+#ifndef MACH_CALL
+#define	MACH_CALL(expr, ret) {						\
+	if (((ret) = (expr)) != KERN_SUCCESS) {				\
+		mach_error(#expr, (ret));				\
+		assert(0);						\
+	}								\
+}
+#endif
+
+/*
+ * Debugging support.
+ */
+#ifdef	CTHREADS_DEBUG
+
+#define	private
+#define	TRACE(x)	if (cthread_debug) x ; else
+extern int cthread_debug;
+
+/*
+ * C library imports:
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#else	/* CTHREADS_DEBUG */
+
+#define	private static
+#define	TRACE(x)
+
+#endif	/* DEBUG */