[PATCH 3/5] ntoskrnl.exe: Implement ExIsResourceAcquiredExclusiveLite().

[Zebediah Figura]

Signed-off-by: Zebediah Figura <z.figura12 at gmail.com>
---
 dlls/ntoskrnl.exe/ntoskrnl.exe.spec |  2 +-
 dlls/ntoskrnl.exe/sync.c            | 19 +++++++++++++++++++
 include/ddk/wdm.h                   |  1 +
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
index 3324b3b6d8..d3e6070149 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
+++ b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
@@ -165,7 +165,7 @@
 @ stub ExInterlockedPushEntryList
 @ stdcall ExInterlockedRemoveHeadList(ptr ptr)
 @ stub ExIsProcessorFeaturePresent
-@ stub ExIsResourceAcquiredExclusiveLite
+@ stdcall ExIsResourceAcquiredExclusiveLite(ptr)
 @ stub ExIsResourceAcquiredSharedLite
 @ stdcall ExLocalTimeToSystemTime(ptr ptr) RtlLocalTimeToSystemTime
 @ stub ExNotifyCallback
diff --git a/dlls/ntoskrnl.exe/sync.c b/dlls/ntoskrnl.exe/sync.c
index 7009c4cfec..94b9778602 100644
--- a/dlls/ntoskrnl.exe/sync.c
+++ b/dlls/ntoskrnl.exe/sync.c
@@ -1125,3 +1125,22 @@ ULONG WINAPI ExGetSharedWaiterCount( ERESOURCE *resource )
 
     return count;
 }
+
+/***********************************************************************
+ *           ExIsResourceAcquiredExclusiveLite   (NTOSKRNL.EXE.@)
+ */
+BOOLEAN WINAPI ExIsResourceAcquiredExclusiveLite( ERESOURCE *resource )
+{
+    BOOLEAN ret;
+    KIRQL irql;
+
+    TRACE("resource %p.\n", resource);
+
+    KeAcquireSpinLock( &resource->SpinLock, &irql );
+
+    ret = (resource->OwnerEntry.OwnerThread == (ERESOURCE_THREAD)KeGetCurrentThread());
+
+    KeReleaseSpinLock( &resource->SpinLock, irql );
+
+    return ret;
+}
diff --git a/include/ddk/wdm.h b/include/ddk/wdm.h
index a0219c4c1e..5a84602d43 100644
--- a/include/ddk/wdm.h
+++ b/include/ddk/wdm.h
@@ -1531,6 +1531,7 @@ NTSTATUS  WINAPI ExInitializeResourceLite(ERESOURCE*);
 PSLIST_ENTRY WINAPI ExInterlockedPopEntrySList(PSLIST_HEADER,PKSPIN_LOCK);
 PSLIST_ENTRY WINAPI ExInterlockedPushEntrySList(PSLIST_HEADER,PSLIST_ENTRY,PKSPIN_LOCK);
 LIST_ENTRY * WINAPI ExInterlockedRemoveHeadList(LIST_ENTRY*,KSPIN_LOCK*);
+BOOLEAN   WINAPI ExIsResourceAcquiredExclusiveLite(ERESOURCE*);
 void      WINAPI ExReleaseFastMutexUnsafe(PFAST_MUTEX);
 void      WINAPI ExReleaseResourceForThreadLite(ERESOURCE*,ERESOURCE_THREAD);
 ULONG     WINAPI ExSetTimerResolution(ULONG,BOOLEAN);
-- 
2.21.0