X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/c910b4d9d2451126ae3917b931cd4390c11e1d52..7e4a7d3939db04e70062ae6c7bf24b8c8b2f5a7c:/osfmk/kern/syscall_subr.c

diff --git a/osfmk/kern/syscall_subr.c b/osfmk/kern/syscall_subr.c
index 15af1fa7e..3daf1ec38 100644
--- a/osfmk/kern/syscall_subr.c
+++ b/osfmk/kern/syscall_subr.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000-2008 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2009 Apple Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
@@ -74,6 +74,25 @@
 #include <mach/mach_host_server.h>
 #include <mach/mach_syscalls.h>
 
+
+#ifdef MACH_BSD
+extern void workqueue_thread_yielded(void);
+#endif /* MACH_BSD */
+
+
+/* Called from commpage to take a delayed preemption when exiting
+ * the "Preemption Free Zone" (PFZ).
+ */
+kern_return_t
+pfz_exit(
+__unused	struct pfz_exit_args *args)
+{
+	/* For now, nothing special to do.  We'll pick up the ASTs on kernel exit. */
+
+	return (KERN_SUCCESS);
+}
+
+
 /*
  *	swtch and swtch_pri both attempt to context switch (logic in
  *	thread_block no-ops the context switch if nothing would happen).
@@ -221,6 +240,8 @@ thread_switch(
 	    return (KERN_INVALID_ARGUMENT);
     }
 
+    workqueue_thread_yielded();
+
 	/*
 	 * Translate the port name if supplied.
 	 */