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136 lines
2.3 KiB
136 lines
2.3 KiB
/*++
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Copyright (c) Microsoft Corporation. All rights reserved.
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Module Name:
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locks.c
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Abstract:
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This module contains locking routines used by both cfgmgr32
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and umpnpmgr.
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InitPrivateResource
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DestroyPrivateResource
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Author:
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Jim Cavalaris (jamesca) 03-15-2001
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Environment:
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User mode only.
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Revision History:
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15-March-2001 jamesca
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Creation and initial implementation.
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--*/
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//
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// includes
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//
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#include "precomp.h"
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#pragma hdrstop
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#include "umpnplib.h"
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//
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// Common locking routines, used by client and server.
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// (LOCKINFO type definition and inline lock / unlock routines defined in
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// umpnplib.h)
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//
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BOOL
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InitPrivateResource(
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OUT PLOCKINFO Lock
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)
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/*++
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Routine Description:
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Initialize a lock structure to be used with Synchronization routines.
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Arguments:
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LockHandles - supplies structure to be initialized. This routine creates
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the locking event and mutex and places handles in this structure.
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Return Value:
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TRUE if the lock structure was successfully initialized. FALSE if not.
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--*/
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{
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Lock->LockHandles[DESTROYED_EVENT] = CreateEvent(NULL, TRUE, FALSE, NULL);
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if (Lock->LockHandles[DESTROYED_EVENT] != NULL) {
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Lock->LockHandles[ACCESS_MUTEX] = CreateMutex(NULL, FALSE, NULL);
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if (Lock->LockHandles[ACCESS_MUTEX] != NULL) {
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return TRUE;
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}
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CloseHandle(Lock->LockHandles[DESTROYED_EVENT]);
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Lock->LockHandles[DESTROYED_EVENT] = NULL;
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}
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return FALSE;
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} // InitPrivateResource
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VOID
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DestroyPrivateResource(
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IN OUT PLOCKINFO Lock
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)
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/*++
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Routine Description:
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Tears down a lock structure created by InitPrivateResource.
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ASSUMES THAT THE CALLING ROUTINE HAS ALREADY ACQUIRED THE LOCK!
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Arguments:
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LockHandle - supplies structure to be torn down. The structure itself
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is not freed.
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Return Value:
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None.
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--*/
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{
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HANDLE h1,h2;
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h1 = Lock->LockHandles[DESTROYED_EVENT];
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h2 = Lock->LockHandles[ACCESS_MUTEX];
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Lock->LockHandles[DESTROYED_EVENT] = NULL;
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Lock->LockHandles[ACCESS_MUTEX] = NULL;
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CloseHandle(h2);
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SetEvent(h1);
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CloseHandle(h1);
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return;
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} // DestroyPrivateResource
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