97 lines
1.9 KiB
C
97 lines
1.9 KiB
C
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/*
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Copyright (c) 1992 Microsoft Corporation
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Module Name:
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swmr.h
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Abstract:
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This module contains the Single writer-Multi reader access structures
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Also the lock-list-count structures.
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Author:
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Jameel Hyder (microsoft!jameelh)
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Revision History:
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25 Apr 1992 Initial Version
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Notes: Tab stop: 4
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--*/
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#ifndef _SWMR_
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#define _SWMR_
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#if DBG
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#define SWMR_SIGNATURE *(DWORD *)"SWMR"
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#define VALID_SWMR(pSwmr) (((pSwmr) != NULL) && \
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((pSwmr)->Signature == SWMR_SIGNATURE))
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#else
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#define VALID_SWMR(pSwmr) ((pSwmr) != NULL)
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#endif
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#define SWMR_SOMEONE_WAITING( _pSwmr ) ((_pSwmr)->swmr_cExclWaiting || \
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(_pSwmr)->swmr_cSharedWaiting)
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typedef struct _SingleWriterMultiReader
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{
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#if DBG
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DWORD Signature;
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#endif
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BYTE swmr_cOwnedExclusive; // # of times a single thread has owned it exclusively
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BYTE swmr_cExclWaiting; // Number of writers waiting
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BYTE swmr_cSharedOwners; // Count of threads owning shared access
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BYTE swmr_cSharedWaiting; // Count of threads waiting for shared access
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PETHREAD swmr_ExclusiveOwner; // Owning thread for exclusive access
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KSEMAPHORE swmr_ExclSem; // semaphore for Exclusive owners
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KSEMAPHORE swmr_SharedSem; // Semaphore for Shared owners
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} SWMR, *PSWMR;
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extern
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VOID FASTCALL
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AfpSwmrInitSwmr(
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IN OUT PSWMR pSwmr
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);
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extern
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VOID FASTCALL
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AfpSwmrAcquireShared(
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IN PSWMR pSwmr
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);
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VOID FASTCALL
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AfpSwmrAcquireExclusive(
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IN PSWMR pSwmr
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);
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extern
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VOID FASTCALL
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AfpSwmrRelease(
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IN PSWMR pSwmr
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);
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extern
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BOOLEAN FASTCALL
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AfpSwmrUpgradeToExclusive(
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IN PSWMR pSwmr
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);
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extern
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VOID FASTCALL
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AfpSwmrDowngradeToShared(
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IN PSWMR pSwmr
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);
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#define AfpSwmrLockedShared(pSwmr) \
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(((pSwmr)->swmr_cSharedOwners != 0) && \
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((pSwmr)->swmr_cOwnedExclusive == 0))
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#define AfpSwmrLockedExclusive(pSwmr) \
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(((pSwmr)->swmr_cOwnedExclusive != 0) && \
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((pSwmr)->swmr_ExclusiveOwner == PsGetCurrentThread()))
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#endif // _SWMR_
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