[PATCH v6 2/2] ntoskrnl.exe: Implement KeReleaseGuardedMutex.

[Etaash Mathamsetty]

From: Etaash Mathamsetty

---
 dlls/ntoskrnl.exe/ntoskrnl.exe.spec |  2 ++
 dlls/ntoskrnl.exe/sync.c            | 23 +++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
index 8a67ebdf4c8..4b84f3e304b 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
+++ b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
@@ -58,6 +58,8 @@
 @ stdcall KeLeaveGuardedRegion()
 @ stdcall -arch=!i386 KeReleaseInStackQueuedSpinLock(ptr)
 @ stdcall -fastcall KeReleaseInStackQueuedSpinLockFromDpcLevel(ptr)
+@ stdcall KeReleaseGuardedMutexUnsafe(ptr)
+@ stdcall KeReleaseGuardedMutex(ptr)
 @ stub KeSetTimeUpdateNotifyRoutine
 @ stub KefAcquireSpinLockAtDpcLevel
 @ stub KefReleaseSpinLockFromDpcLevel
diff --git a/dlls/ntoskrnl.exe/sync.c b/dlls/ntoskrnl.exe/sync.c
index 2c227974cd7..8ff198efc49 100644
--- a/dlls/ntoskrnl.exe/sync.c
+++ b/dlls/ntoskrnl.exe/sync.c
@@ -462,6 +462,29 @@ void WINAPI KeAcquireGuardedMutex(PKGUARDED_MUTEX mutex)
     KeAcquireGuardedMutexUnsafe(mutex);
 }

+/***********************************************************************
+ *           KeReleaseGuardedMutexUnsafe   (NTOSKRNL.EXE.@)
+ */
+void WINAPI KeReleaseGuardedMutexUnsafe(PKGUARDED_MUTEX mutex)
+{
+    LONG count;
+
+    TRACE("mutex %p.\n", mutex);
+
+    count = InterlockedIncrement( &mutex->Count );
+    if (count < 1)
+        KeSetEvent( &mutex->Event, IO_NO_INCREMENT, FALSE );
+}
+
+/***********************************************************************
+ *           KeReleaseGuardedMutex   (NTOSKRNL.EXE.@)
+ */
+void WINAPI KeReleaseGuardedMutex(PKGUARDED_MUTEX mutex)
+{
+    KeReleaseGuardedMutexUnsafe(mutex);
+    /* FIXME: Leave Guarded Region */
+}
+
 static void CALLBACK ke_timer_complete_proc(PTP_CALLBACK_INSTANCE instance, void *timer_, PTP_TIMER tp_timer)
 {
     KTIMER *timer = timer_;