165 lines
2.7 KiB
C
165 lines
2.7 KiB
C
/*++
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Copyright (c) 1999-2001 Microsoft Corporation
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Module Name:
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locks.h
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Abstract:
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Contains all the lock related macros.
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Author:
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ChunYe
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Environment:
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Kernel mode
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Revision History:
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--*/
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#ifndef _LOCKS_H
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#define _LOCKS_H
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#define IPSEC_READ_LOCK 1
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#define IPSEC_WRITE_LOCK 2
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#define INIT_LOCK(l) KeInitializeSpinLock(l)
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#define ACQUIRE_LOCK(l, q) KeAcquireSpinLock(l, q)
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#define RELEASE_LOCK(l, q) KeReleaseSpinLock(l, q)
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//
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// The Filter/SA database is protected by a single-writer (infrequent) and
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// multiple-reader (frequent) locking scheme.
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//
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typedef struct _MRSW_LOCK
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{
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KSPIN_LOCK SpinLock;
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ULONG RefCount;
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#if DBG
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ULONG LastLockLine;
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ULONG LastLockType;
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#endif
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} MRSW_LOCK, *PMRSW_LOCK;
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__inline
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VOID
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InitializeMRSWLock(
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PMRSW_LOCK pRWLock
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)
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{
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pRWLock->RefCount = 0;
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KeInitializeSpinLock(&pRWLock->SpinLock);
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#if DBG
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pRWLock->LastLockLine = 0;
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pRWLock->LastLockType = 0;
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#endif
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}
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__inline
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VOID
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AcquireReadLock(
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PMRSW_LOCK pRWLock,
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PKIRQL pIrql
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)
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{
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KeAcquireSpinLock(&pRWLock->SpinLock, pIrql);
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InterlockedIncrement(&pRWLock->RefCount);
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KeReleaseSpinLockFromDpcLevel(&pRWLock->SpinLock);
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#if DBG
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pRWLock->LastLockLine = __LINE__;
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pRWLock->LastLockType = 1;
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#endif
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}
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__inline
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VOID
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ReleaseReadLock(
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PMRSW_LOCK pRWLock,
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KIRQL Irql
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)
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{
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InterlockedDecrement(&pRWLock->RefCount);
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KeLowerIrql(Irql);
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}
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__inline
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VOID
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AcquireReadLockAtDpc(
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PMRSW_LOCK pRWLock
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)
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{
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KeAcquireSpinLockAtDpcLevel(&pRWLock->SpinLock);
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InterlockedIncrement(&pRWLock->RefCount);
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KeReleaseSpinLockFromDpcLevel(&pRWLock->SpinLock);
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#if DBG
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pRWLock->LastLockLine = __LINE__;
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pRWLock->LastLockType = IPSEC_READ_LOCK;
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#endif
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}
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__inline
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VOID
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ReleaseReadLockFromDpc(
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PMRSW_LOCK pRWLock
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)
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{
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InterlockedDecrement(&pRWLock->RefCount);
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}
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__inline
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VOID
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AcquireWriteLock(
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PMRSW_LOCK pRWLock,
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PKIRQL pIrql
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)
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{
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KeAcquireSpinLock(&pRWLock->SpinLock, pIrql);
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while (*((volatile *)&pRWLock->RefCount));
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#if DBG
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pRWLock->LastLockLine = __LINE__;
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pRWLock->LastLockType = IPSEC_WRITE_LOCK;
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#endif
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}
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__inline
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VOID
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ReleaseWriteLock(
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PMRSW_LOCK pRWLock,
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KIRQL Irql
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)
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{
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KeReleaseSpinLock(&pRWLock->SpinLock, Irql);
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}
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__inline
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VOID
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AcquireWriteLockAtDpc(
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PMRSW_LOCK pRWLock
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)
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{
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KeAcquireSpinLockAtDpcLevel(&pRWLock->SpinLock);
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while (*((volatile *)&pRWLock->RefCount));
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#if DBG
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pRWLock->LastLockLine = __LINE__;
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pRWLock->LastLockType = IPSEC_WRITE_LOCK;
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#endif
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}
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__inline
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VOID
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ReleaseWriteLockFromDpc(
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PMRSW_LOCK pRWLock
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)
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{
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KeReleaseSpinLockFromDpcLevel(&pRWLock->SpinLock);
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}
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#endif _LOCKS_H
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