129 lines
2 KiB
C
129 lines
2 KiB
C
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/*++
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Copyright (c) 1996 Microsoft Corporation
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Module Name:
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memlog.c
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Abstract:
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general purpose in-memory logging facility
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Author:
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Charlie Wickham (charlwi) 31-May-1997
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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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#include "precomp.h"
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#pragma hdrstop
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/* External */
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/* Static */
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/* Forward */
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/* End Forward */
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#ifdef MEMLOGGING
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//
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// in-memory event logging facility. This is used to determine
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// subtle timing problems that can't be observed via printfs.
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//
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#define MAX_MEMLOG_ENTRIES 2000
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ULONG MemLogEntries = MAX_MEMLOG_ENTRIES;
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ULONG MemLogNextLogEntry = 0;
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PMEMLOG_ENTRY MemLog;
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KSPIN_LOCK MemLogLock;
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VOID
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CnInitializeMemoryLog(
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VOID
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)
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{
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KeInitializeSpinLock( &MemLogLock );
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if ( MemLogEntries > 0 ) {
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MemLog = CnAllocatePool( MemLogEntries * sizeof( MEMLOG_ENTRY ));
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if ( MemLog == NULL ) {
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MemLogEntries = 0;
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}
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MEMLOG( MemLogInitLog, 0, 0 );
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}
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}
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NTSTATUS
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CnSetMemLogging(
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PCLUSNET_SET_MEM_LOGGING_REQUEST request
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)
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{
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KIRQL OldIrql;
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NTSTATUS Status = STATUS_SUCCESS;
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if ( request->NumberOfEntries != MemLogEntries ) {
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KeAcquireSpinLock( &MemLogLock, &OldIrql );
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if ( MemLog != NULL ) {
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CnFreePool( MemLog );
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MemLogEntries = 0;
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MemLog = NULL;
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}
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if ( request->NumberOfEntries != 0 ) {
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MemLogEntries = request->NumberOfEntries;
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MemLog = CnAllocatePool( MemLogEntries * sizeof( MEMLOG_ENTRY ));
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if ( MemLog == NULL ) {
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MemLogEntries = 0;
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Status = STATUS_INSUFFICIENT_RESOURCES;
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} else {
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MemLogNextLogEntry = 0;
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}
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}
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KeReleaseSpinLock( &MemLogLock, OldIrql );
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}
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return Status;
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}
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VOID
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CnFreeMemoryLog(
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VOID
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)
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{
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if ( MemLog )
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CnFreePool( MemLog );
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}
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#else // MEMLOGGING
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NTSTATUS
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CnSetMemLogging(
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PCLUSNET_SET_MEM_LOGGING_REQUEST request
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)
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{
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return STATUS_INVALID_DEVICE_REQUEST;
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}
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#endif // MEMLOGGING
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/* end memlog.c */
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