[reactos] 03/11: [NTOS:CM] Implement the shared lock macro for use

[George Bișoc]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=8a335a3141dc698c517a7…

commit 8a335a3141dc698c517a76feec797549fed75040
Author:     George Bișoc <george.bisoc(a)reactos.org>
AuthorDate: Thu Feb 16 20:16:53 2023 +0100
Commit:     George Bișoc <george.bisoc(a)reactos.org>
CommitDate: Sun Oct 1 20:06:00 2023 +0200

    [NTOS:CM] Implement the shared lock macro for use
    
    CmpAcquireKcbLockSharedByKey can come in handy for use to lock KCBs by their convkey
with a shared lock, specifically we would need this for cache lookup stuff.
---
 ntoskrnl/include/internal/cm_x.h | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/ntoskrnl/include/internal/cm_x.h b/ntoskrnl/include/internal/cm_x.h
index daf7d67643b..5e7dffd2872 100644
--- a/ntoskrnl/include/internal/cm_x.h
+++ b/ntoskrnl/include/internal/cm_x.h
@@ -89,6 +89,14 @@
     (GET_HASH_ENTRY(CmpCacheTable,                                  \
                     (k)->ConvKey)->Owner == KeGetCurrentThread())
 
+//
+// Shared acquires a KCB by index
+//
+#define CmpAcquireKcbLockSharedByIndex(i)                           \
+{                                                                   \
+    ExAcquirePushLockShared(&CmpCacheTable[(i)].Lock);              \
+}
+
 //
 // Exclusively acquires a KCB by index
 //
@@ -120,6 +128,16 @@ CmpAcquireKcbLockExclusiveByKey(IN ULONG ConvKey)
     CmpAcquireKcbLockExclusiveByIndex(GET_HASH_INDEX(ConvKey));
 }
 
+//
+// Shared acquires a KCB by key
+//
+FORCEINLINE
+VOID
+CmpAcquireKcbLockSharedByKey(
+    _In_ ULONG ConvKey)
+{
+    CmpAcquireKcbLockSharedByIndex(GET_HASH_INDEX(ConvKey));
+}
 
 //
 // Shared acquires a KCB
@@ -130,14 +148,6 @@ CmpAcquireKcbLockExclusiveByKey(IN ULONG ConvKey)
                                             (k)->ConvKey)->Lock);    \
 }
 
-//
-// Shared acquires a KCB by index
-//
-#define CmpAcquireKcbLockSharedByIndex(i)                           \
-{                                                                   \
-    ExAcquirePushLockShared(&CmpCacheTable[(i)].Lock);              \
-}
-
 //
 // Tries to convert a KCB lock
 //