ntoskrnl.exe: Implement ExGetSharedWaiterCount().

dlls/ntoskrnl.exe/ntoskrnl.exe.spec

@@ -148,7 +148,7 @@
 @ stub ExGetCurrentProcessorCpuUsage
 @ stdcall ExGetExclusiveWaiterCount(ptr)
 @ stub ExGetPreviousMode
-@ stub ExGetSharedWaiterCount
+@ stdcall ExGetSharedWaiterCount(ptr)
 @ stdcall ExInitializeNPagedLookasideList(ptr ptr ptr long long long long)
 @ stdcall ExInitializePagedLookasideList(ptr ptr ptr long long long long)
 @ stdcall ExInitializeResourceLite(ptr)

dlls/ntoskrnl.exe/sync.c

@@ -1106,3 +1106,22 @@ ULONG WINAPI ExGetExclusiveWaiterCount( ERESOURCE *resource )
 
     return count;
 }
+
+/***********************************************************************
+ *           ExGetSharedWaiterCount   (NTOSKRNL.EXE.@)
+ */
+ULONG WINAPI ExGetSharedWaiterCount( ERESOURCE *resource )
+{
+    ULONG count;
+    KIRQL irql;
+
+    TRACE("resource %p.\n", resource);
+
+    KeAcquireSpinLock( &resource->SpinLock, &irql );
+
+    count = resource->NumberOfSharedWaiters;
+
+    KeReleaseSpinLock( &resource->SpinLock, irql );
+
+    return count;
+}

include/ddk/wdm.h

@@ -1525,6 +1525,7 @@ NTSTATUS  WINAPI ExDeleteResourceLite(ERESOURCE*);
 void      WINAPI ExFreePool(PVOID);
 void      WINAPI ExFreePoolWithTag(PVOID,ULONG);
 ULONG     WINAPI ExGetExclusiveWaiterCount(ERESOURCE*);
+ULONG     WINAPI ExGetSharedWaiterCount(ERESOURCE*);
 void      WINAPI ExInitializeNPagedLookasideList(PNPAGED_LOOKASIDE_LIST,PALLOCATE_FUNCTION,PFREE_FUNCTION,ULONG,SIZE_T,ULONG,USHORT);
 NTSTATUS  WINAPI ExInitializeResourceLite(ERESOURCE*);
 PSLIST_ENTRY WINAPI ExInterlockedPopEntrySList(PSLIST_HEADER,PKSPIN_LOCK);