205 lines
4.6 KiB
C++
205 lines
4.6 KiB
C++
/*++
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Copyright (c) 1997 Microsoft Corporation
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Module Name:
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lock.cxx
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Abstract:
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Contains code for the Service Control Database manager. This includes
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all the database lock routines. This file contains the following
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classes:
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CCountingResource
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CServiceListLock
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CGroupListLock
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Author:
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Anirudh Sahni (anirudhs) 09-Jan-1997
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Environment:
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User Mode -Win32
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Revision History:
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09-Jan-1997 AnirudhS
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Created, replacing the old locking functions in dataman.cxx.
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--*/
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//
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// INCLUDES
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//
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#include "precomp.hxx"
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//
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// Macros
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//
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#define LOCK_LOG(string) SC_LOG3(LOCKS, " %s" string " level = %ld\n", \
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_ShortName, _Name, CurrentLevel())
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//
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// Globals
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//
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CServiceRecordLock ScServiceRecordLock;
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CServiceListLock ScServiceListLock;
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CGroupListLock ScGroupListLock;
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/*************************************************************************/
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/* CCountingResource methods */
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/*************************************************************************/
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#if DBG
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void
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CCountingResource::GetShared()
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{
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LOCK_LOG(" Asking for %s lock shared...");
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SC_ASSERT(!HaveExclusive());
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RtlAcquireResourceShared(&_Lock, TRUE);
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SetCurrentLevel(CurrentLevel() + 1);
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LOCK_LOG("+Acquired %s lock shared,");
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}
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void
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CCountingResource::GetExclusive()
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{
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LOCK_LOG(" Asking for %s lock exclusive...");
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SC_ASSERT(!Have() || HaveExclusive());
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RtlAcquireResourceExclusive(&_Lock, TRUE);
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SetCurrentLevel(CurrentLevel() - 1);
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LOCK_LOG("+Acquired %s lock exclusive,");
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}
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void
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CCountingResource::MakeShared()
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{
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LOCK_LOG("vConverting %s lock to shared...");
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SC_ASSERT(CurrentLevel() == -1);
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RtlConvertExclusiveToShared(&_Lock);
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SetCurrentLevel(1);
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LOCK_LOG(" Converted %s lock to shared,");
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}
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void
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CCountingResource::MakeExclusive()
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{
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// WARNING: This option is easily misused.
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LOCK_LOG(" Converting %s lock to exclusive...");
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SC_ASSERT(CurrentLevel() == 1);
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RtlConvertSharedToExclusive(&_Lock);
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SetCurrentLevel(-1);
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LOCK_LOG("^Converted %s lock to exclusive,");
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}
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void
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CCountingResource::Release()
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{
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LOCK_LOG("-Releasing %s lock...");
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SC_ASSERT(Have());
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RtlReleaseResource( &_Lock );
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if (CurrentLevel() > 0)
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{
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SetCurrentLevel(CurrentLevel() - 1);
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}
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else
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{
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SetCurrentLevel(CurrentLevel() + 1);
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}
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LOCK_LOG(" Released %s lock,");
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}
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#endif // DBG
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/*************************************************************************/
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/* CServiceListLock methods */
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/*************************************************************************/
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#if DBG
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void
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CServiceListLock::GetShared()
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{
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// The record lock mustn't be acquired before the list lock
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if (!Have())
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{
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SC_ASSERT(! ScServiceRecordLock.Have());
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}
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CCountingResource::GetShared();
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}
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void
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CServiceListLock::GetExclusive()
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{
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// The record lock mustn't be acquired before the list lock
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if (!Have())
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{
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SC_ASSERT(! ScServiceRecordLock.Have());
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}
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CCountingResource::GetExclusive();
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}
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void
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CServiceListLock::Release()
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{
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// We mustn't release this if we still have the record lock
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if (CurrentLevel() == 1 || CurrentLevel() == -1)
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{
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SC_ASSERT(! ScServiceRecordLock.Have());
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}
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CCountingResource::Release();
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}
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#endif // DBG
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/*************************************************************************/
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/* CGroupListLock methods */
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/*************************************************************************/
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#if DBG
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void
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CGroupListLock::GetShared()
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{
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// The service list lock mustn't be acquired before the group list lock
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if (!Have())
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{
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SC_ASSERT(! ScServiceListLock.Have());
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}
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CCountingResource::GetShared();
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}
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void
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CGroupListLock::GetExclusive()
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{
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// The service list lock mustn't be acquired before the group list lock
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if (!Have())
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{
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SC_ASSERT(! ScServiceListLock.Have());
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}
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CCountingResource::GetExclusive();
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}
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void
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CGroupListLock::Release()
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{
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// We mustn't release this if we still have the service list lock or
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// service record lock
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if (CurrentLevel() == 1 || CurrentLevel() == -1)
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{
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SC_ASSERT(! ScServiceRecordLock.Have());
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SC_ASSERT(! ScServiceListLock.Have());
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}
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CCountingResource::Release();
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}
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#endif // DBG
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