113 lines
2.4 KiB
C++
113 lines
2.4 KiB
C++
/******************************************************************************
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Copyright (c) 1999-2000 Microsoft Corporation
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Module Name:
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StaticCrt.cpp
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Abstract:
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This file contains the implementation of various CRT functions, so we don't
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need to link against MSVCP60.DLL
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Revision History:
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Davide Massarenti (Dmassare) 05/29/2000
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created
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******************************************************************************/
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#include <stdafx.h>
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// CLASS bad_alloc_nocrt
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class bad_alloc_nocrt
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{
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public:
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bad_alloc_nocrt() _THROW0() {}
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~bad_alloc_nocrt() _THROW0() {}
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};
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void __cdecl operator delete(void *ptr)
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{
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free( ptr );
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}
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void *__cdecl operator new( size_t cb )
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{
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void *res = malloc( cb );
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if(!res) throw bad_alloc_nocrt();
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return res;
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}
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_STD_BEGIN
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void __cdecl _XlenNR() { throw "string too long"; } // report a length_error
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void __cdecl _XranNR() { throw "invalid string position"; } // report an out_of_range error
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_STD_END
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#ifdef _MT
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#include <xstddef>
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#include <windows.h>
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_STD_BEGIN
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static CRITICAL_SECTION _CritSec;
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static long _InitFlag = 0L;
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static void __cdecl _CleanUp()
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{
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long InitFlagValue;
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if ( InitFlagValue = InterlockedExchange( &_InitFlag, 3L ) == 2L )
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// Should be okay to delete critical section
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DeleteCriticalSection( &_CritSec );
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}
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_Lockit::_Lockit()
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{
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// Most common case - just enter the critical section
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if ( _InitFlag == 2L ) {
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EnterCriticalSection( &_CritSec );
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return;
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}
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// Critical section either needs to be initialized.
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if ( _InitFlag == 0L ) {
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long InitFlagVal;
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if ( (InitFlagVal = InterlockedExchange( &_InitFlag, 1L )) == 0L ) {
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InitializeCriticalSection( &_CritSec );
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atexit( _CleanUp );
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_InitFlag = 2L;
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}
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else if ( InitFlagVal == 2L )
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_InitFlag = 2L;
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}
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// If necessary, wait while another thread finishes initializing the
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// critical section
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while ( _InitFlag == 1L )
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Sleep( 1 );
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if ( _InitFlag == 2L )
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EnterCriticalSection( &_CritSec );
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}
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_Lockit::~_Lockit()
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{
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if ( _InitFlag == 2L )
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LeaveCriticalSection( &_CritSec );
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}
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_STD_END
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#endif
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