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RtlRealPredecessor function (ntddk.h)

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The RtlRealPredecessor routine returns a pointer to the predecessor of the specified node in the splay link tree.

Syntax

NTSYSAPI PRTL_SPLAY_LINKS RtlRealPredecessor(
  [in] PRTL_SPLAY_LINKS Links
);

Parameters

[in] Links

Pointer to the node. The node must have been initialized by calling RtlInitializeSplayLinks.

Return value

RtlRealPredecessor returns a pointer to the predecessor of the node at Links, or NULL if the node has no predecessor.

Remarks

The predecessor of a given node is determined as follows:

  • If the given node has a left subtree, the rightmost node in the left subtree of the node at Links is the predecessor. Note that RtlSubtreePredecessor returns the same result for this case.
  • Otherwise, the nearest ancestor node, of which the given node is a right-subtree descendant, is the predecessor.
Callers of the Rtl splay link routines are responsible for synchronizing access to the splay link tree. A fast mutex is the most efficient synchronization mechanism to use for this purpose.

Callers of RtlRealPredecessor must be running at IRQL <= DISPATCH_LEVEL if the tree is nonpaged. Usually, callers are running at IRQL PASSIVE_LEVEL.

Requirements

Requirement Value
Minimum supported client This routine is available on Microsoft Windows 2000 and later.
Target Platform Universal
Header ntddk.h (include Ntddk.h, Ntifs.h)
Library NtosKrnl.lib
DLL NtosKrnl.exe
IRQL See Remarks section.

See also

RtlRealSuccessor

RtlSplay

RtlSubtreePredecessor