reactos/lib/rtl/slist.c

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS Runtime Library
* PURPOSE: Slist Routines
* FILE: lib/rtl/slist.c
* PROGRAMERS: Stefan Ginsberg (stefan__100__@hotmail.com)
*/
/* INCLUDES *****************************************************************/
#include <rtl.h>
#define NDEBUG
#include <debug.h>
/* FUNCTIONS ***************************************************************/
VOID
NTAPI
RtlInitializeSListHead(IN PSLIST_HEADER ListHead)
{
#ifdef _WIN64
ListHead->Alignment = 0;
ListHead->Region = 0;
ListHead->Header8.Init = 1;
// ListHead->Header8.HeaderType = 1; // FIXME: depending on cmpxchg16b support?
#else
ListHead->Alignment = 0;
#endif
}
PSLIST_ENTRY
NTAPI
RtlFirstEntrySList(IN const SLIST_HEADER *ListHead)
{
#ifdef _WIN64
if (ListHead->Header8.HeaderType)
{
return (PVOID)(ListHead->Region & ~0xF);
}
else
{
union {
PVOID P;
struct {
ULONG64 Reserved:4;
ULONG64 NextEntry:39;
ULONG64 Reserved2:21;
} Bits;
} Pointer;
Pointer.P = (PVOID)ListHead;
Pointer.Bits.NextEntry = ListHead->Header8.NextEntry;
return Pointer.P;
}
#else
return ListHead->Next.Next;
#endif
}
WORD
NTAPI
RtlQueryDepthSList(IN PSLIST_HEADER ListHead)
{
#ifdef _WIN64
return ListHead->Header8.HeaderType ?
(WORD)ListHead->Header16.Sequence : (WORD)ListHead->Header8.Sequence;
#else
return ListHead->Depth;
#endif
}