212 lines
5.0 KiB
C++
212 lines
5.0 KiB
C++
//+-----------------------------------------------------------------------
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//
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// File: resource.hxx
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//
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// Contents: CResource, CReadLock, CWriteLock,
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// CSafeReadLock, CSafeWriteLock.
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//
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//
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// History: 8 Mar 93 WadeR Created.
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// 08-Jul-93 WadeR Moved from security to common
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// 18-Nov-93 WadeR Made inline, added Safe locks
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//
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//------------------------------------------------------------------------
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#ifndef _INC_RESOURCE_HXX_
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#define _INC_RESOURCE_HXX_
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extern "C"
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{
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#include <nt.h>
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#include <ntrtl.h>
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#include <nturtl.h>
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}
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#include <except.hxx>
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//+-----------------------------------------------------------------
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//
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// Class: CResource
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//
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// Purpose: Allows multiple readers or single writer at a resource.
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//
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// Interface: [CResource] --
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// [~CResource] --
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// [GetRead] --
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// [GetWrite] --
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// [ReadToWrite] --
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// [WriteToRead] --
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// [Release] --
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//
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// History: 24-Feb-93 WadeR Created.
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//
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// Notes: This wrapper will allow starving writers, since it just
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// passes everything through to the RTL Resource code, which
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// allows starving writers.
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//
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//------------------------------------------------------------------
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class CResource
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{
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RTL_RESOURCE _rResource;
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public:
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CResource();
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~CResource();
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void Release();
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void GetRead();
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void GetWrite();
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void ReadToWrite();
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void WriteToRead();
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};
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inline
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CResource::CResource()
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{
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RtlInitializeResource( &_rResource );
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}
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inline
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CResource::~CResource()
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{
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RtlDeleteResource( &_rResource );
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}
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inline
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void CResource::Release()
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{
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RtlReleaseResource( &_rResource );
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}
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inline
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void CResource::GetRead()
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{
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RtlAcquireResourceShared( &_rResource, TRUE );
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}
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inline
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void CResource::GetWrite()
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{
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RtlAcquireResourceExclusive( &_rResource, TRUE );
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}
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inline
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void CResource::ReadToWrite()
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{
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RtlConvertSharedToExclusive( &_rResource );
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}
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inline
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void CResource::WriteToRead()
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{
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RtlConvertExclusiveToShared( &_rResource );
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}
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//+---------------------------------------------------------------------------
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//
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// Class: CReadLock
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//
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// Purpose: Lock using a Resource monitor
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//
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// History: 24-Feb-93 WadeR Created.
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//
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// Notes: Simple lock object to be created on the stack.
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// The constructor acquires the resource, the destructor
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// (called when lock is going out of scope) releases it.
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//
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//----------------------------------------------------------------------------
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class CReadLock
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{
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public:
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CReadLock ( CResource& r ) : _r(r)
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{ _r.GetRead(); };
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~CReadLock ()
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{ _r.Release(); };
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private:
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CResource& _r;
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};
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//+---------------------------------------------------------------------------
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//
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// Class: CWriteLock
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//
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// Purpose: Lock using a Resource monitor
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//
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// History: 24-Feb-93 WadeR Created.
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//
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// Notes: Simple lock object to be created on the stack.
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// The constructor acquires the resource, the destructor
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// (called when lock is going out of scope) releases it.
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//
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//----------------------------------------------------------------------------
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class CWriteLock
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{
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public:
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CWriteLock ( CResource& r ) : _r(r)
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{ _r.GetWrite(); };
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~CWriteLock ()
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{ _r.Release(); };
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private:
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CResource& _r;
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};
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//+---------------------------------------------------------------------------
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//
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// Class: CSafeReadLock
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//
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// Purpose: Exception safe lock using a Resource monitor
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//
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// History: 24-Feb-93 WadeR Created.
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//
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// Notes: Simple lock object to be created on the stack.
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// The constructor acquires the resource, the destructor
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// (called when lock is going out of scope) releases it.
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//
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//----------------------------------------------------------------------------
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class CSafeReadLock : INHERIT_UNWIND
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{
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INLINE_UNWIND(CSafeReadLock);
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public:
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CSafeReadLock ( CResource& r ) : _r(r)
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{ _r.GetRead(); END_CONSTRUCTION (CSafeReadLock); };
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~CSafeReadLock ()
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{ _r.Release(); };
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private:
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CResource& _r;
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};
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//+---------------------------------------------------------------------------
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//
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// Class: CSafeWriteLock
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//
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// Purpose: Exception safe lock using a Resource monitor
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//
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// History: 24-Feb-93 WadeR Created.
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//
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// Notes: Simple lock object to be created on the stack.
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// The constructor acquires the resource, the destructor
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// (called when lock is going out of scope) releases it.
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//
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//----------------------------------------------------------------------------
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class CSafeWriteLock : INHERIT_UNWIND
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{
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INLINE_UNWIND(CSafeWriteLock);
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public:
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CSafeWriteLock ( CResource& r ) : _r(r)
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{ _r.GetWrite(); END_CONSTRUCTION (CSafeWriteLock); };
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~CSafeWriteLock ()
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{ _r.Release(); };
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private:
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CResource& _r;
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};
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#endif // _INC_RESOURCE_HXX_
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