156 lines
2.3 KiB
C
156 lines
2.3 KiB
C
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/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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cmsubs3.c
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Abstract:
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This module contains locking support routines for the configuration manager.
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Author:
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Bryan M. Willman (bryanwi) 30-Mar-1992
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Revision History:
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--*/
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#include "cmp.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE,CmpUnlockRegistry)
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#if DBG
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#pragma alloc_text(PAGE,CmpTestRegistryLock)
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#pragma alloc_text(PAGE,CmpTestRegistryLockExclusive)
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#endif
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#endif
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// Global registry lock
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ERESOURCE CmpRegistryLock;
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PVOID CmpCaller;
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PVOID CmpCallerCaller;
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VOID
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CmpLockRegistry(
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VOID
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)
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/*++
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Routine Description:
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Lock the registry for shared (read-only) access
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Arguments:
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None.
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Return Value:
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None, the registry lock will be held for shared access upon return.
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--*/
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{
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#if DBG
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PVOID Caller;
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PVOID CallerCaller;
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#endif
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KeEnterCriticalRegion();
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ExAcquireResourceShared(&CmpRegistryLock, TRUE);
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#if DBG
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RtlGetCallersAddress(&Caller, &CallerCaller);
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CMLOG(CML_FLOW, CMS_LOCKING) {
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KdPrint(("CmpLockRegistry: c, cc: %08lx %08lx\n", Caller, CallerCaller));
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}
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#endif
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}
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VOID
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CmpLockRegistryExclusive(
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VOID
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)
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/*++
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Routine Description:
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Lock the registry for exclusive (write) access.
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Arguments:
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CanWait - Supplies whether or not the call should wait
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for the resource or return immediately.
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If CanWait is TRUE, this will always return
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TRUE.
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Return Value:
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TRUE - Lock was acquired exclusively
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FALSE - Lock is owned by another thread.
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--*/
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{
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BOOLEAN Status;
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KeEnterCriticalRegion();
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ExAcquireResourceExclusive(&CmpRegistryLock,TRUE);
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RtlGetCallersAddress(&CmpCaller, &CmpCallerCaller);
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}
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VOID
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CmpUnlockRegistry(
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)
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/*++
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Routine Description:
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Unlock the registry.
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--*/
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{
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ASSERT_CM_LOCK_OWNED();
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ExReleaseResource(&CmpRegistryLock);
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KeLeaveCriticalRegion();
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}
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#if DBG
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BOOLEAN
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CmpTestRegistryLock(VOID)
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{
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BOOLEAN rc;
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rc = TRUE;
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if (ExIsResourceAcquiredShared(&CmpRegistryLock) == 0) {
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rc = FALSE;
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}
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return rc;
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}
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BOOLEAN
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CmpTestRegistryLockExclusive(VOID)
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{
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if (ExIsResourceAcquiredExclusive(&CmpRegistryLock) == 0) {
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return(FALSE);
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}
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return(TRUE);
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}
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#endif
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