90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
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/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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SysInit.c
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Abstract:
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This module implements the Log File Service initialization.
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Author:
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Brian Andrew [BrianAn] 20-June-1991
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--*/
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#include "lfsprocs.h"
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// The debug trace level
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#define Dbg (DEBUG_TRACE_INITIALIZATION)
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#undef MODULE_POOL_TAG
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#define MODULE_POOL_TAG ('IsfL')
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, LfsInitializeLogFileService)
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#endif
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extern USHORT LfsUsaSeqNumber;
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BOOLEAN LfsInitializeLogFileService ()
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/*++
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Routine Description:
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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.
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This routine has no dependencies on other system components being initialized.
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This routine will initialize the global structures used by the logging service and start the Lfs worker thread.
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Return Value:
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TRUE if initialization was successful
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--*/
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{
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LARGE_INTEGER CurrentTime;
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PAGED_CODE();
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DebugTrace( +1, Dbg, "LfsInitializeLogFileService: Enter\n", 0 );
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// If the structure has already been initialized then we can return immediately.
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if (LfsData.NodeTypeCode == LFS_NTC_DATA && LfsData.NodeByteSize == sizeof( LFS_DATA ) && FlagOn( LfsData.Flags, LFS_DATA_INITIALIZED )) {
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DebugTrace( -1, Dbg, "LfsInitializeLogFileService: Exit -> %01x\n", TRUE );
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return TRUE;
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}
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RtlZeroMemory( &LfsData, sizeof( LFS_DATA ));// Zero out the structure initially.
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LfsData.Flags = LFS_DATA_INIT_FAILED;// Assume the operation will fail.
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// Initialize the global structure for Lfs.
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LfsData.NodeTypeCode = LFS_NTC_DATA;
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LfsData.NodeByteSize = sizeof( LFS_DATA );
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InitializeListHead( &LfsData.LfcbLinks );
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ExInitializeFastMutex( &LfsData.LfsDataLock );// Initialize the synchronization objects.
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// Initialize the buffer allocation. System will be robust enough to tolerate allocation failures.
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ExInitializeFastMutex( &LfsData.BufferLock );
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KeInitializeEvent( &LfsData.BufferNotification, NotificationEvent, TRUE );
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LfsData.Buffer1 = LfsAllocatePoolNoRaise( PagedPool, LFS_BUFFER_SIZE );
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if (LfsData.Buffer1 == NULL) {
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return FALSE;
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}
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LfsData.Buffer2 = LfsAllocatePoolNoRaise( PagedPool, LFS_BUFFER_SIZE );
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// Make sure we got both.
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if (LfsData.Buffer2 == NULL) {
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LfsFreePool( LfsData.Buffer1 );
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LfsData.Buffer1 = NULL;
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return FALSE;
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}
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// Initialization has been successful.
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ClearFlag( LfsData.Flags, LFS_DATA_INIT_FAILED );
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SetFlag( LfsData.Flags, LFS_DATA_INITIALIZED );
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// Get a random number as a seed for the Usa sequence numbers. Use the lower bits of the current time.
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KeQuerySystemTime( &CurrentTime );
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LfsUsaSeqNumber = (USHORT) CurrentTime.LowPart;
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DebugTrace( -1, Dbg, "LfsInitializeLogFileService: Exit -> %01x\n", TRUE );
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return TRUE;
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}
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