137 lines
3.1 KiB
C
137 lines
3.1 KiB
C
/* VxWorks provides its own version of malloc, and we can't use this
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one because VxWorks does not provide sbrk. So we have a hook to
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not compile this code. */
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#ifdef MALLOC_PROVIDED
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int _dummy_mstats = 1;
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#else
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/*
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FUNCTION
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<<mallinfo>>, <<malloc_stats>>, <<mallopt>>---malloc support
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INDEX
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mallinfo
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INDEX
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malloc_stats
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INDEX
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mallopt
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INDEX
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_mallinfo_r
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INDEX
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_malloc_stats_r
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INDEX
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_mallopt_r
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SYNOPSIS
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#include <malloc.h>
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struct mallinfo mallinfo(void);
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void malloc_stats(void);
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int mallopt(int <[parameter]>, <[value]>);
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struct mallinfo _mallinfo_r(void *<[reent]>);
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void _malloc_stats_r(void *<[reent]>);
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int _mallopt_r(void *<[reent]>, int <[parameter]>, <[value]>);
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DESCRIPTION
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<<mallinfo>> returns a structure describing the current state of
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memory allocation. The structure is defined in malloc.h. The
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following fields are defined: <<arena>> is the total amount of space
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in the heap; <<ordblks>> is the number of chunks which are not in use;
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<<uordblks>> is the total amount of space allocated by <<malloc>>;
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<<fordblks>> is the total amount of space not in use; <<keepcost>> is
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the size of the top most memory block.
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<<malloc_stats>> print some statistics about memory allocation on
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standard error.
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<<mallopt>> takes a parameter and a value. The parameters are defined
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in malloc.h, and may be one of the following: <<M_TRIM_THRESHOLD>>
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sets the maximum amount of unused space in the top most block before
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releasing it back to the system in <<free>> (the space is released by
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calling <<_sbrk_r>> with a negative argument); <<M_TOP_PAD>> is the
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amount of padding to allocate whenever <<_sbrk_r>> is called to
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allocate more space.
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The alternate functions <<_mallinfo_r>>, <<_malloc_stats_r>>, and
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<<_mallopt_r>> are reentrant versions. The extra argument <[reent]>
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is a pointer to a reentrancy structure.
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RETURNS
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<<mallinfo>> returns a mallinfo structure. The structure is defined
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in malloc.h.
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<<malloc_stats>> does not return a result.
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<<mallopt>> returns zero if the parameter could not be set, or
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non-zero if it could be set.
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PORTABILITY
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<<mallinfo>> and <<mallopt>> are provided by SVR4, but <<mallopt>>
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takes different parameters on different systems. <<malloc_stats>> is
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not portable.
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*/
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#include <_ansi.h>
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#include <reent.h>
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#include <stdlib.h>
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#include <malloc.h>
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#include <stdio.h>
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#ifndef _REENT_ONLY
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struct mallinfo
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mallinfo (void)
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{
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return _mallinfo_r (_REENT);
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}
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#if !defined (_ELIX_LEVEL) || _ELIX_LEVEL >= 2
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void
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malloc_stats (void)
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{
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_malloc_stats_r (_REENT);
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}
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int
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mallopt (int p,
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int v)
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{
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return _mallopt_r (_REENT, p, v);
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}
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#endif /* !_ELIX_LEVEL || _ELIX_LEVEL >= 2 */
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#endif
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#if !defined (_ELIX_LEVEL) || _ELIX_LEVEL >= 2
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/* mstats is now compatibility code. It used to be real, for a
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previous version of the malloc routines. It now just calls
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malloc_stats. */
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void
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_mstats_r (struct _reent *ptr,
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char *s)
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{
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_REENT_SMALL_CHECK_INIT(ptr);
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fiprintf (_stderr_r (ptr), "Memory allocation statistics %s\n", s);
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_malloc_stats_r (ptr);
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}
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#ifndef _REENT_ONLY
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void
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mstats (char *s)
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{
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_mstats_r (_REENT, s);
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}
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#endif
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#endif /* !_ELIX_LEVEL || _ELIX_LEVEL >= 2 */
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#endif /* ! defined (MALLOC_PROVIDED) */
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