86 lines
1.8 KiB
C++
86 lines
1.8 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1996 - 1999.
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//
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// File: falloc.hxx
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//
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// Contents: fast memory allocator
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//
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// History: 15-Mar-96 dlee Created.
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//
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//----------------------------------------------------------------------------
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#pragma once
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// alignment for all allocations
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const ULONG cbMemAlignment = 8;
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inline ULONG memAlignBlock( ULONG x )
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{
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return ( x + ( cbMemAlignment - 1 ) ) & ~( cbMemAlignment - 1 );
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}
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void * memAlloc( UINT ui );
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void memFree( void * p );
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UINT memSize( void const * p );
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BOOL memIsValidPointer( const void * p );
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void memUtilization();
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//+---------------------------------------------------------------------------
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//
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// Class: CMemMutex
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//
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// Purpose: Class for the global heap lock
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//
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// History: 25-Oct-96 dlee Created.
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//
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//----------------------------------------------------------------------------
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class CMemMutex
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{
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public:
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CMemMutex()
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{
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// two-phase construction to deal with exception on initialization
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memset( &_cs, 0, sizeof _cs );
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}
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~CMemMutex()
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{
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DeleteCriticalSection( &_cs );
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}
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void Init()
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{
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// The high bit means the event is pre-allocated, so it won't
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// fail to be allocated while we're unwinding an exception.
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InitializeCriticalSectionAndSpinCount( &_cs, 0x80000500 );
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}
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void Enter()
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{
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ciAssert( !IsHeld() ); // valid, but would be wasteful
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EnterCriticalSection( &_cs );
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}
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void Leave()
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{
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ciAssert( IsHeld() ); // valid, but would be wasteful
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LeaveCriticalSection( &_cs );
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}
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BOOL IsHeld()
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{
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return ( LongToHandle( GetCurrentThreadId() ) == _cs.OwningThread );
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}
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private:
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CRITICAL_SECTION _cs;
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};
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