97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
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/***
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*heapprm.c - Set/report heap parameters
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*
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* Copyright (c) 1991-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Set or report the values of certain parameters in the heap.
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*
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*Revision History:
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* 03-04-91 GJF Module created.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 04-30-95 GJF Made conditional on WINHEAP.
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*
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*******************************************************************************/
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#ifndef WINHEAP
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#include <cruntime.h>
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#include <heap.h>
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#include <malloc.h>
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#include <mtdll.h>
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/***
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*_heap_param(int flag, int param_id, void *pparam) - set or report the values
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* of the specified heap parameter.
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*
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*Purpose:
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* Get or set certain parameters which affect the behavior of the heap.
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* The supported parameters vary implementation to implementation and
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* version to version. See description of entry conditions for the
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* currently supported parameters.
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*
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*Entry:
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* int flag - _HP_GETPARAM, to get a parameter value, or _HP_SETPARAM,
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* to set a parameter value
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*
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* int param_id - identifier for the heap parameter. values supported in
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* this release are:
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*
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* _HP_AMBLKSIZ - _amblksiz (aka _heap_growsize) parameter
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* _HP_GROWSIZE - same as _HP_AMBLKSIZ
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* _HP_RESETSIZE - _heap_resetsize parameter
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*
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* void *pparam - pointer to variable of appropriate type for the heap
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* parameter to be fetched/set
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*
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*Exit:
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* 0 = no error has occurred
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* -1 = an error has occurred (errno is set)
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl _heap_param (
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int flag,
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int param_id,
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void *pparam
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)
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{
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switch ( param_id ) {
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case _HP_RESETSIZE:
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if ( flag == _HP_SETPARAM ) {
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_mlock(_HEAP_LOCK);
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_heap_resetsize = *(unsigned *)pparam;
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_munlock(_HEAP_LOCK);
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}
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else
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*(unsigned *)pparam = _heap_resetsize;
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break;
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case _HP_AMBLKSIZ:
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if ( flag == _HP_SETPARAM )
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/*
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* the only references to _amblksiz (aka
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* _heap_growsize) are atomic. therefore, the
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* heap does not need to be locked.
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*/
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_amblksiz = *(unsigned *)pparam;
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else
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*(unsigned *)pparam = _amblksiz;
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break;
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default:
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return -1;
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}
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return 0;
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}
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#endif /* WINHEAP */
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