Index: /trunk/src/VBox/HostDrivers/Support/SUPDrv.c
===================================================================
--- /trunk/src/VBox/HostDrivers/Support/SUPDrv.c	(revision 19931)
+++ /trunk/src/VBox/HostDrivers/Support/SUPDrv.c	(revision 19932)
@@ -260,4 +260,8 @@
 DECLASM(int)    UNWIND_WRAP(RTThreadUserWaitNoResume)(RTTHREAD Thread, unsigned cMillies);
 #endif
+/* RTThreadPreemptIsEnabled - not necessary */
+/* RTThreadPreemptIsPending  - not necessary */
+/* RTThreadPreemptDisable - not necessary */
+DECLASM(void)   UNWIND_WRAP(RTThreadPreemptRestore)(RTTHREADPREEMPTSTATE pState);
 /* RTLogDefaultInstance   - a bit of a gamble, but we do not want the overhead! */
 /* RTMpCpuId              - not necessary */
@@ -415,4 +419,9 @@
     { "RTThreadUserWaitNoResume",               (void *)UNWIND_WRAP(RTThreadUserWaitNoResume) },
 #endif
+    { "RTThreadPreemptIsEnabled",               (void *)RTThreadPreemptIsEnabled },
+    { "RTThreadPreemptIsPending",               (void *)RTThreadPreemptIsPending },
+    { "RTThreadPreemptDisable",                 (void *)RTThreadPreemptDisable },
+    { "RTThreadPreemptRestore",                 (void *)UNWIND_WRAP(RTThreadPreemptRestore) },
+
     { "RTLogDefaultInstance",                   (void *)RTLogDefaultInstance },
     { "RTMpCpuId",                              (void *)RTMpCpuId },
Index: /trunk/src/VBox/HostDrivers/Support/SUPDrvIOC.h
===================================================================
--- /trunk/src/VBox/HostDrivers/Support/SUPDrvIOC.h	(revision 19931)
+++ /trunk/src/VBox/HostDrivers/Support/SUPDrvIOC.h	(revision 19932)
@@ -188,5 +188,5 @@
  *            and renaming the related IOCtls too.
  */
-#define SUPDRV_IOC_VERSION                              0x000c0002
+#define SUPDRV_IOC_VERSION                              0x000c0003
 
 /** SUP_IOCTL_COOKIE. */
Index: /trunk/src/VBox/HostDrivers/Support/SUPR0.def
===================================================================
--- /trunk/src/VBox/HostDrivers/Support/SUPR0.def	(revision 19931)
+++ /trunk/src/VBox/HostDrivers/Support/SUPR0.def	(revision 19932)
@@ -119,4 +119,8 @@
     RTThreadSleep
     RTThreadYield
+    RTThreadPreemptIsEnabled
+    RTThreadPreemptIsPending
+    RTThreadPreemptDisable
+    RTThreadPreemptRestore
     RTMpOnAll
     RTMpOnOthers
Index: /trunk/src/VBox/HostDrivers/Support/win/SUPDrvA-win.asm
===================================================================
--- /trunk/src/VBox/HostDrivers/Support/win/SUPDrvA-win.asm	(revision 19931)
+++ /trunk/src/VBox/HostDrivers/Support/win/SUPDrvA-win.asm	(revision 19932)
@@ -153,4 +153,8 @@
 NtWrapDyn2DrvFunctionWithAllRegParams  supdrvNtWrap, RTThreadUserWaitNoResume
 %endif
+;NtWrapDyn2DrvFunctionWithAllRegParams  supdrvNtWrap, RTThreadPreemptIsEnabled - not necessary
+;NtWrapDyn2DrvFunctionWithAllRegParams  supdrvNtWrap, RTThreadPreemptIsPending - not necessary
+;NtWrapDyn2DrvFunctionWithAllRegParams  supdrvNtWrap, RTThreadPreemptDisable - not necessary
+NtWrapDyn2DrvFunctionWithAllRegParams  supdrvNtWrap, RTThreadPreemptRestore
 ;NtWrapDyn2DrvFunctionWithAllRegParams  supdrvNtWrap, RTLogDefaultInstance   - a bit of a gamble, but we do not want the overhead!
 ;NtWrapDyn2DrvFunctionWithAllRegParams  supdrvNtWrap, RTMpCpuId              - not necessary