--- xnu/xnu-344.49/iokit/Kernel/IOWorkLoop.cpp
+++ xnu/xnu-792.6.56/iokit/Kernel/IOWorkLoop.cpp
@@ -2,8 +2,6 @@
  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
- * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
  * 
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
@@ -60,18 +58,6 @@
 
 #define fFlags loopRestart
 
-extern "C" extern void stack_privilege( thread_t thread);
-
-void IOWorkLoop::launchThreadMain(void *self)
-{
-    register thread_t mythread = current_thread();
-
-    // Make sure that this thread always has a kernel stack
-    stack_privilege(mythread);
-    thread_set_cont_arg((int) self);
-    threadMainContinuation();
-}
-
 bool IOWorkLoop::init()
 {
     // The super init and gateLock allocation MUST be done first
@@ -99,7 +85,7 @@
     if (addEventSource(controlG) != kIOReturnSuccess)
         return false;
 
-    workThread = IOCreateThread(launchThreadMain, (void *) this);
+    workThread = IOCreateThread((thread_continue_t)threadMainContinuation, this);
     if (!workThread)
         return false;
 
@@ -112,7 +98,7 @@
     IOWorkLoop *me = new IOWorkLoop;
 
     if (me && !me->init()) {
-        me->free();
+        me->release();
         return 0;
     }
 
@@ -255,12 +241,9 @@
 
 #endif /* KDEBUG */
 
-void IOWorkLoop::threadMainContinuation()
-{
-  IOWorkLoop* self;
-  self = (IOWorkLoop *) thread_get_cont_arg();
-
-  self->threadMain();
+void IOWorkLoop::threadMainContinuation(IOWorkLoop *self)
+{
+	self->threadMain();
 }
 
 void IOWorkLoop::threadMain()
@@ -303,8 +286,7 @@
 	    assert_wait((void *) &workToDo, false);
 	    IOSimpleLockUnlockEnableInterrupt(workToDoLock, is);
 
-	    thread_set_cont_arg((int) this);
-	    thread_block(&threadMainContinuation);
+	    thread_block_parameter((thread_continue_t)threadMainContinuation, this);
 	    /* NOTREACHED */
 	}
 
@@ -376,8 +358,8 @@
 }
 
 IOReturn IOWorkLoop::runAction(Action inAction, OSObject *target,
-                                  void *arg0 = 0, void *arg1 = 0,
-                                  void *arg2 = 0, void *arg3 = 0)
+                                  void *arg0, void *arg1,
+                                  void *arg2, void *arg3)
 {
     IOReturn res;