[PATCH v2 2/5] ntoskrnl.exe: Implement ExGetSharedWaiterCount().

[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 bdf2a4463c..3324b3b6d8 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
+++ b/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)
diff --git a/dlls/ntoskrnl.exe/sync.c b/dlls/ntoskrnl.exe/sync.c
index 823ff2b587..7009c4cfec 100644
--- a/dlls/ntoskrnl.exe/sync.c
+++ b/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;
+}
diff --git a/include/ddk/wdm.h b/include/ddk/wdm.h
index 241f6d695e..a0219c4c1e 100644
--- a/include/ddk/wdm.h
+++ b/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);
-- 
2.21.0