209 lines
2.8 KiB
C++
209 lines
2.8 KiB
C++
/*++
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Copyright (c) 1996 Microsoft Corporation
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All rights reserved.
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Module Name:
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sharemem.hxx
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Abstract:
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Simple shared memory object.
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Author:
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Albert Ting (AlbertT) 17-Dec-1996
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Revision History:
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--*/
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#ifndef SHAREMEM_HXX
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#define SHAREMEM_HXX
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/********************************************************************
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TShareMemLock
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Lock a TShareMem for access. If this call succeeds, pGet() will
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return the pointer to the object.
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TShareMem ShareMem( sizeof( TMyObject ),
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TEXT( "MyObject" ),
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TShareMem::kCreate | TShareMem::kReadWrite,
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NULL,
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NULL );
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if( ShareMem.bValid( )){
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TMyObject *pMyObject;
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TShareMemLock<TMyObject> SML( ShareMem, &pMyObject );
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//
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// Use pMyObject--note it can't have any virtual functions!
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//
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}
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//
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// Closing scope of TShareMemLock removes lock.
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//
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********************************************************************/
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class TShareMem;
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template<class T>
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class TShareMemLock {
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public:
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TShareMemLock(
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TShareMem &ShareMem,
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T **ppMem
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);
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~TShareMemLock(
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VOID
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);
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private:
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TShareMem &m_ShareMem;
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};
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template<class T>
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inline
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TShareMemLock<T>::
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TShareMemLock(
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IN TShareMem &ShareMem,
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OUT T **ppMem
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) : m_ShareMem( ShareMem )
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{
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m_ShareMem.vEnter();
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*ppMem = static_cast<T*>( ShareMem.pGetData() );
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}
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template<class T>
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inline
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TShareMemLock<T>::
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~TShareMemLock(
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VOID
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)
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{
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m_ShareMem.vLeave();
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}
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class TShareMem {
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public:
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enum {
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kNull = 0,
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kCreate = 1,
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kReadWrite = 2
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};
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TShareMem(
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UINT uSize,
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LPCTSTR pszName,
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UINT uFlags,
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PSECURITY_ATTRIBUTES psa,
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PUINT puSizeDisposition
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);
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~TShareMem(
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VOID
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);
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BOOL
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bValid(
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VOID
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);
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VOID
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vEnter(
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VOID
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);
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VOID
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vLeave(
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VOID
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);
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PVOID
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pGetData(
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VOID
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);
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private:
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typedef struct HEADER {
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UINT uHeaderSize;
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UINT uSize;
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} *PHEADER;
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HEADER&
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GetHeader(
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VOID
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);
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HANDLE m_hFile;
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PVOID m_pvBase;
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PVOID m_pvUserData;
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HANDLE m_hMutex;
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};
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inline
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BOOL
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TShareMem::
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bValid(
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VOID
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)
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{
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return m_pvUserData != NULL;
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}
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inline
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TShareMem::HEADER&
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TShareMem::
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GetHeader(
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VOID
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)
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{
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return *static_cast<PHEADER>( m_pvBase );
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}
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inline
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VOID
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TShareMem::
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vEnter(
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VOID
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)
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{
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WaitForSingleObject( m_hMutex, INFINITE );
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}
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inline
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VOID
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TShareMem::
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vLeave(
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VOID
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)
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{
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ReleaseMutex( m_hMutex );
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}
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inline
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PVOID
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TShareMem::
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pGetData(
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VOID
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)
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{
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return m_pvUserData;
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}
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#endif // ifdef SHAREMEM_HXX
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