73 lines
1.4 KiB
C++
73 lines
1.4 KiB
C++
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// newop operator new(size_t) for Microsoft C++
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#include <cstdlib>
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#include <xstddef>
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#include <new>
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#include <dbgint.h>
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#if !defined(_MSC_EXTENSIONS)
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#define RESERVE_SIZE 256 /* for out-of-heap handling */
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static void *pres = 0;
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_C_LIB_DECL
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int _callnewh(size_t size);
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#ifdef _DLL
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static void __cdecl cleanup_pres(void)
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{ // free reserved block
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if (pres != 0)
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_free_crt(pres);
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}
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#endif
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_END_C_LIB_DECL
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void *__cdecl operator new(size_t size) _THROW1(_STD bad_alloc)
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{ // try to allocate size bytes
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static void *pres = 0;
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{_STD _Lockit _Lk;
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#ifdef _DLL
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static int firsttime = 0;
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if (firsttime == 0)
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{ // register routine to clean up reserve space
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atexit(&cleanup_pres);
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++firsttime;
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}
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#endif
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if (pres == 0)
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pres = _malloc_crt(RESERVE_SIZE);
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}
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void *p;
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while ((p = malloc(size)) == 0)
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{ // handle failure to allocate
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{_STD _Lockit _Lk;
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if (pres != 0)
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{ // free reserve space
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_free_crt(pres);
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pres = 0;
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}
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}
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if (_callnewh(size) == 0)
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break;
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}
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if (p == 0)
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_STD _Nomemory();
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return (p);
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}
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#endif
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/*
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* Copyright (c) 1994 by P.J. Plauger. ALL RIGHTS RESERVED.
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* Consult your license regarding permissions and restrictions.
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*/
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/*
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941029 pjp: added _STD machinery
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950330 pjp: added throw clause
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950608 pjp: added reserve space
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960214 pjp: added locks
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960313 pjp: tidied headers
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960317 pjp: put new/delete in global namespace
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961026 pjp: added logic to free reserved block
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*/
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