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76 lines
1.3 KiB
76 lines
1.3 KiB
/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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intbits.c
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Abstract:
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This module contains routines to do interlocked bit manipulation
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Author:
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Neill Clift (NeillC) 12-May-2000
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Environment:
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User and kernel mode.
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Revision History:
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Rob Earhart (earhart) October 13, 2000
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Moved from Ex to Rtl
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--*/
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#include "ntrtlp.h"
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#pragma hdrstop
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ULONG
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FASTCALL
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RtlInterlockedSetClearBits (
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IN OUT PULONG Flags,
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IN ULONG sFlag,
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IN ULONG cFlag
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)
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/*++
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Routine Description:
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This function atomically sets and clears the specified flags in the target
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Arguments:
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Flags - Pointer to variable containing current mask.
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sFlag - Flags to set in target
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CFlag - Flags to clear in target
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Return Value:
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ULONG - Old value of mask before modification
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--*/
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{
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ULONG NewFlags, OldFlags;
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OldFlags = *Flags;
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NewFlags = (OldFlags | sFlag) & ~cFlag;
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while (NewFlags != OldFlags) {
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NewFlags = InterlockedCompareExchange ((PLONG) Flags, (LONG) NewFlags, (LONG) OldFlags);
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if (NewFlags == OldFlags) {
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break;
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}
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OldFlags = NewFlags;
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NewFlags = (NewFlags | sFlag) & ~cFlag;
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}
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return OldFlags;
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}
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