--- /dev/null
+++ Libc/Libc-262/threads/mig_support.c
@@ -0,0 +1,171 @@
+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ * 
+ * This 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 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.
+ */
+/*
+ * mig_support.c  - by Mary Thompson
+ *
+ * Routines to set and deallocate the mig reply port for the current thread.
+ * Called from mig-generated interfaces.
+ */
+#include <mach/mach.h>
+#include <pthread_internals.h>
+#include <pthread.h>
+
+#include "cthreads.h"
+#include "cthread_internals.h"
+
+pthread_lock_t reply_port_lock;
+extern mach_port_t _pthread_reply_port(pthread_t);
+static mach_port_t _task_reply_port = MACH_PORT_NULL;
+
+/*
+ * called in new child...
+ * clear lock to cover case where the parent had
+ * a thread holding this lock while another thread
+ * did the fork()
+ */
+void mig_fork_child()
+{
+	UNLOCK(reply_port_lock);
+}
+
+/*
+ * Called by mach_init with 0 before cthread_init is
+ * called and again with 1 at the end of cthread_init.
+ */
+void
+mig_init(init_done)
+	int init_done;
+{
+    if (init_done == 0) {
+        LOCK_INIT(reply_port_lock);
+        _task_reply_port = mach_reply_port();
+    }
+}
+
+/*
+ * Called by mig interface code whenever a reply port is needed.
+ * Tracing is masked during this call; otherwise, a call to printf()
+ * can result in a call to malloc() which eventually reenters
+ * mig_get_reply_port() and deadlocks.
+ */
+mach_port_t
+mig_get_reply_port()
+{
+	register cproc_t self;
+        pthread_t pself;
+#ifdef	CTHREADS_DEBUG
+	int d = cthread_debug;
+#endif	CTHREADS_DEBUG
+
+#ifdef	CTHREADS_DEBUG
+	cthread_debug = FALSE;
+#endif	CTHREADS_DEBUG
+        pself = pthread_self();
+        if ((pself != (pthread_t)NULL) && (pself->sig == _PTHREAD_SIG)) {
+            if (pself->reply_port == MACH_PORT_NULL) {
+                pself->reply_port = mach_reply_port();
+            }
+            return pself->reply_port;
+        }
+	self = cproc_self();
+	if (self == NO_CPROC) {
+#ifdef	CTHREADS_DEBUG
+		cthread_debug = d;
+#endif	CTHREADS_DEBUG
+		return(_task_reply_port);
+	}
+        if (self->reply_port == MACH_PORT_NULL) {
+            self->reply_port = mach_reply_port();
+        }
+#ifdef	CTHREADS_DEBUG
+	cthread_debug = d;
+#endif	CTHREADS_DEBUG
+	return self->reply_port;
+}
+
+/*
+ * Called by mig interface code after a timeout on the reply port.
+ * May also be called by user. The new mig calls with port passed in
+ * We are ignoring this , so is osfmk cthreads code
+ */
+void
+mig_dealloc_reply_port(mach_port_t migport)
+{
+	register cproc_t self;
+        pthread_t pself;
+	register mach_port_t port;
+#ifdef	CTHREADS_DEBUG
+	int d = cthread_debug;
+#endif	CTHREADS_DEBUG
+
+#ifdef	CTHREADS_DEBUG
+	cthread_debug = FALSE;
+#endif	CTHREADS_DEBUG
+        pself = pthread_self();
+        if ((pself != (pthread_t)NULL) && (pself->sig == _PTHREAD_SIG)) {
+            port = pself->reply_port;
+            if (port != MACH_PORT_NULL && port != _task_reply_port) {
+                    LOCK(reply_port_lock);
+                    pself->reply_port = _task_reply_port;
+                    (void) mach_port_destroy(mach_task_self(), port);
+                    pself->reply_port = MACH_PORT_NULL;
+                    UNLOCK(reply_port_lock);
+            }
+            return;
+        }
+	self = cproc_self();
+	if (self == NO_CPROC) {
+#ifdef	CTHREADS_DEBUG
+		cthread_debug = d;
+#endif	CTHREADS_DEBUG
+		return;
+	}
+	ASSERT(self != NO_CPROC);
+	port = self->reply_port;
+        if (port != MACH_PORT_NULL && port != _task_reply_port) {
+		LOCK(reply_port_lock);
+                self->reply_port = _task_reply_port;
+                (void) mach_port_destroy(mach_task_self(), port);
+                self->reply_port = MACH_PORT_NULL;
+		UNLOCK(reply_port_lock);
+	}
+#ifdef	CTHREADS_DEBUG
+	cthread_debug = d;
+#endif	CTHREADS_DEBUG
+}
+
+/*************************************************************
+ *  Called by mig interfaces after each RPC.
+ *  Could be called by user.
+ ***********************************************************/
+
+void
+mig_put_reply_port(
+	mach_port_t	reply_port)
+{
+}