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/*++
Copyright (c) 1990 Microsoft Corporation
Module Name:
SysInit.c
Abstract:
This module implements the Log File Service initialization.
Author:
Brian Andrew [BrianAn] 20-June-1991
Revision History:
--*/
#include "lfsprocs.h"
//
// The debug trace level
//
#define Dbg (DEBUG_TRACE_INITIALIZATION)
#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE, LfsInitializeLogFileService)
#endif
extern USHORT LfsUsaSeqNumber;
BOOLEAN
LfsInitializeLogFileService (
)
/*++
Routine Description:
This routine must be called during system initialization before the
first call to logging service, to allow the Log File Service to initialize
its global data structures. This routine has no dependencies on other
system components being initialized.
This routine will initialize the global structures used by the logging
service and start the Lfs worker thread.
Arguments:
None
Return Value:
TRUE if initialization was successful
--*/
{
LARGE_INTEGER CurrentTime;
PAGED_CODE();
DebugTrace( +1, Dbg, "LfsInitializeLogFileService: Enter\n", 0 );
//
// If the structure has already been initialized then we can return
// immediately.
//
if (LfsData.NodeTypeCode == LFS_NTC_DATA
&& LfsData.NodeByteSize == sizeof( LFS_DATA )
&& FlagOn( LfsData.Flags, LFS_DATA_INITIALIZED )) {
DebugTrace( -1, Dbg, "LfsInitializeLogFileService: Exit -> %01x\n", TRUE );
return TRUE;
}
//
// Zero out the structure initially.
//
RtlZeroMemory( &LfsData, sizeof( LFS_DATA ));
//
// Assume the operation will fail.
//
LfsData.Flags = LFS_DATA_INIT_FAILED;
//
// Initialize the global structure for Lfs.
//
LfsData.NodeTypeCode = LFS_NTC_DATA;
LfsData.NodeByteSize = sizeof( LFS_DATA );
InitializeListHead( &LfsData.LfcbLinks );
//
// Allocate and initialize the synchronization objects.
//
KeInitializeEvent( &LfsData.Event,
SynchronizationEvent,
TRUE );
//
// Initialization has been successful.
//
ClearFlag( LfsData.Flags, LFS_DATA_INIT_FAILED );
SetFlag( LfsData.Flags, LFS_DATA_INITIALIZED );
//
// Get a random number as a seed for the Usa sequence numbers. Use the lower
// bits of the current time.
//
KeQuerySystemTime( &CurrentTime );
LfsUsaSeqNumber = (USHORT) CurrentTime.LowPart;
DebugTrace( -1, Dbg, "LfsInitializeLogFileService: Exit -> %01x\n", TRUE );
return TRUE;
}
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