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156 lines
3.3 KiB
156 lines
3.3 KiB
/***
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*heapused.c -
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*
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* Copyright (c) 1993-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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*
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*Revision History:
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* 12-13-93 SKS Create _heapused() to return the number of bytes
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* in used malloc blocks, committed memory for the heap,
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* and reserved for the heap. The bytes in malloc-ed
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* blocks includes the overhead of 4 bytes preceding
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* the entry and the 8 bytes in the descriptor list.
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* 04-30-95 GJF Spliced on winheap version (which is just a stub).
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*
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*******************************************************************************/
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#ifdef WINHEAP
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#include <cruntime.h>
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#include <malloc.h>
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#include <errno.h>
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size_t __cdecl _heapused(
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size_t *pUsed,
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size_t *pCommit
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)
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{
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errno = ENOSYS;
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return( 0 );
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}
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#else /* ndef WINHEAP */
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#include <cruntime.h>
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#include <mtdll.h> /* needed for _heapused() */
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#include <oscalls.h>
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#include <dos.h>
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#include <heap.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef _MT
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size_t __cdecl _heapused(size_t *pUsed, size_t *pCommit)
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{
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size_t retval;
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/* lock the heap */
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_mlock(_HEAP_LOCK);
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retval = _heapused_lk(pUsed, pCommit);
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/* release the heap lock */
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_munlock(_HEAP_LOCK);
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return retval;
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}
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size_t __cdecl _heapused_lk(size_t *pUsed, size_t *pCommit)
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#else /* ndef _MT */
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_CRTIMP size_t __cdecl _heapused(size_t *pUsed, size_t *pCommit)
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#endif /* _MT */
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{
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_PBLKDESC p;
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_PBLKDESC next;
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int index ;
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size_t usedbytes; /* bytes devoted to in-use blocks */
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size_t freebytes; /* bytes devoted to free blocks */
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size_t rsrvbytes; /* total bytes of reserved address space */
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void * * pageptr ;
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if ( (p = _heap_desc.pfirstdesc) == NULL
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|| _heap_desc.pfirstdesc == &_heap_desc.sentinel )
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{
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return 0 ; /* invalid heap */
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}
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/*
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* Scan through the heap, counting free and used blocks.
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* Include the overhead of each block and its heap descriptor.
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*/
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freebytes = 0 ;
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usedbytes = 0 ;
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while (p != NULL)
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{
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next = p->pnextdesc;
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if (p == &_heap_desc.sentinel)
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{
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if (next != NULL)
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{
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return 0 ;
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}
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}
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else if (_IS_FREE(p))
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{
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freebytes += _BLKSIZE(p) + _HDRSIZE;
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}
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else if (_IS_INUSE(p))
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{
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usedbytes += _BLKSIZE(p) + _HDRSIZE;
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}
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p = next;
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}
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/*
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* Now we need to count the pages used for descriptors as reserved memory.
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* _heap_descpages points to the head of a singly-linked list of the pages.
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* The descriptors for in-use blocks are considered in-use memory.
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*/
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pageptr = _heap_descpages;
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rsrvbytes = 0 ;
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while ( pageptr )
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{
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rsrvbytes += _HEAP_EMPTYLIST_SIZE ;
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pageptr = * pageptr ;
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}
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usedbytes += rsrvbytes ;
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/*
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* Loop through the region descriptor table
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*/
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for ( index=0 ; index < _HEAP_REGIONMAX ; index++ )
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{
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rsrvbytes += _heap_regions[index]._totalsize ;
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}
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if ( pUsed )
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* pUsed = usedbytes ;
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if ( pCommit )
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* pCommit = freebytes + usedbytes ;
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return rsrvbytes ;
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}
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#endif /* WINHEAP */
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