[PATCH 5/5] Implement KeAreApcsDisabled using critical region functions.

[Derek Lesho]

Signed-off-by: Derek Lesho 
---
 dlls/ntoskrnl.exe/ntoskrnl.c         | 21 +++++++++++++++++++--
 dlls/ntoskrnl.exe/ntoskrnl.exe.spec  |  2 +-
 dlls/ntoskrnl.exe/ntoskrnl_private.h |  1 +
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/dlls/ntoskrnl.exe/ntoskrnl.c b/dlls/ntoskrnl.exe/ntoskrnl.c
index 85235a444d..675ad59924 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.c
+++ b/dlls/ntoskrnl.exe/ntoskrnl.c
@@ -2503,6 +2503,7 @@ static void *create_thread_object( HANDLE handle )
     if (!(thread = alloc_kernel_object( PsThreadType, handle, sizeof(*thread), 0 ))) return NULL;

thread->Header.WaitListHead.Blink = INVALID_HANDLE_VALUE;
+    thread->critical_region = 0;
     return thread;
 }

@@ -3448,7 +3449,10 @@ void WINAPI ExReleaseResourceForThreadLite( PERESOURCE resource, ERESOURCE_THREA
  */
 void WINAPI KeEnterCriticalRegion(void)
 {
-    FIXME(": stub\n");
+    PETHREAD thread = (PETHREAD) KeGetCurrentThread();
+
+    /* FIXME: actually disable certain APCs */
+    thread->critical_region = TRUE;
 }

/***********************************************************************
@@ -3456,7 +3460,10 @@ void WINAPI KeEnterCriticalRegion(void)
  */
 void WINAPI KeLeaveCriticalRegion(void)
 {
-    FIXME(": stub\n");
+    PETHREAD thread = (PETHREAD) KeGetCurrentThread();
+
+    /* FIXME: actually re-enable certain APCs */
+    thread->critical_region = FALSE;
 }

/***********************************************************************
@@ -4396,3 +4403,13 @@ ULONG WINAPI ExSetTimerResolution(ULONG time, BOOLEAN set_resolution)
     FIXME("stub: %u %d\n", time, set_resolution);
     return KeQueryTimeIncrement();
 }
+
+/*********************************************************************
+ *           KeAreApcsDisabled    (NTOSKRNL.@)
+ */
+BOOLEAN WINAPI KeAreApcsDisabled(void)
+{
+    PETHREAD thread = (PETHREAD) KeGetCurrentThread();
+
+    return thread->critical_region;
+}
diff --git a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
index f8d73450de..cd5c643259 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
+++ b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
@@ -520,7 +520,7 @@
 @ stdcall KeAcquireSpinLockAtDpcLevel(ptr)
 @ stdcall -arch=arm,arm64,x86_64 KeAcquireSpinLockRaiseToDpc(ptr)
 @ stub KeAddSystemServiceTable
-@ stub KeAreApcsDisabled
+@ stdcall KeAreApcsDisabled()
 @ stub KeAttachProcess
 @ stub KeBugCheck
 @ stub KeBugCheckEx
diff --git a/dlls/ntoskrnl.exe/ntoskrnl_private.h b/dlls/ntoskrnl.exe/ntoskrnl_private.h
index 700738adc3..4cc0be153e 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl_private.h
+++ b/dlls/ntoskrnl.exe/ntoskrnl_private.h
@@ -42,6 +42,7 @@ extern POBJECT_TYPE SeTokenObjectType;

struct _ETHREAD {
     DISPATCHER_HEADER Header;
+    BOOLEAN critical_region;
 };

#ifdef __i386__