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80 lines
1.5 KiB
80 lines
1.5 KiB
/*++
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rwexport.h
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This file defines a reader/writer lock implemented in rwnh.dll.
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We define the locks so that none of their internal workings is exposed.
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--*/
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#ifndef _RWEXPORT_H
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#define _RWEXPORT_H
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#ifdef _RW_IMPLEMENTATION_
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#define _RW_INTERFACE_ __declspec( dllexport )
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#else
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#define _RW_INTERFACE_ __declspec( dllimport )
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#endif
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class _RW_INTERFACE_ CShareLockExport {
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private :
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DWORD m_dwSignature ;
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enum constants {
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//
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// Signature in our objects !
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//
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SIGNATURE = (DWORD)'opxE'
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} ;
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//
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// Reserved space for the implementation !
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//
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DWORD m_dwReserved[16] ;
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public :
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CShareLockExport() ;
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~CShareLockExport() ;
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//
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// Grab the lock Shared - other threads may pass through ShareLock() as well
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//
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void ShareLock() ;
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//
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// Releases the lock - if we are the last reader to leave writers may
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// start to enter the lock !
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//
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void ShareUnlock() ;
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//
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// Grab the lock Exclusively - no other readers or writers may enter !!
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//
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void ExclusiveLock() ;
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//
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// Release the Exclusive Locks - if there are readers waiting they
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// will enter before other waiting writers !
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//
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void ExclusiveUnlock() ;
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//
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// Convert an ExclusiveLock to a Shared - this cannot fail !
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//
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void ExclusiveToShared() ;
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//
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// Convert a Shared Lock to an Exclusive one - this can fail - returns
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// TRUE if successfull !
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//
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BOOL SharedToExclusive() ;
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BOOL TryShareLock() ;
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BOOL TryExclusiveLock() ;
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} ;
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#endif
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