47 lines
935 B
C
47 lines
935 B
C
/*++
|
|
|
|
Copyright (c) 2001 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
rwlock.c
|
|
|
|
Abstract:
|
|
|
|
This module implements routines to support executive reader/writer locks.
|
|
|
|
--*/
|
|
|
|
#include "exp.h"
|
|
|
|
VOID
|
|
ExInitializeReadWriteLock(
|
|
IN PERWLOCK ReadWriteLock
|
|
)
|
|
/*++
|
|
|
|
Routine Description:
|
|
|
|
This routine is called by the I/O manager to handle IRP_MJ_CLOSE requests.
|
|
|
|
Arguments:
|
|
|
|
DeviceObject - Specifies the device object that the I/O request is for.
|
|
|
|
Irp - Specifies the packet that describes the I/O request.
|
|
|
|
Return Value:
|
|
|
|
Status of operation.
|
|
|
|
--*/
|
|
{
|
|
ReadWriteLock->LockCount = -1;
|
|
ReadWriteLock->WritersWaitingCount = 0;
|
|
ReadWriteLock->ReadersWaitingCount = 0;
|
|
ReadWriteLock->ReadersEntryCount = 0;
|
|
|
|
KeInitializeEvent(&ReadWriteLock->WriterEvent, SynchronizationEvent, FALSE);
|
|
KeInitializeSemaphore(&ReadWriteLock->ReaderSemaphore, 0, MAXLONG);
|
|
}
|