newlib/libc/stdlib/mstats.c

   1 /* VxWorks provides its own version of malloc, and we can't use this
   2    one because VxWorks does not provide sbrk.  So we have a hook to
   3    not compile this code.  */
   4
   5 #ifdef MALLOC_PROVIDED
   6
   7 int _dummy_mstats = 1;
   8
   9 #else
  10
  11 /*
  12 FUNCTION
  13 <<mallinfo>>, <<malloc_stats>>, <<mallopt>>---malloc support
  14
  15 INDEX
  16         mallinfo
  17 INDEX
  18         malloc_stats
  19 INDEX
  20         mallopt
  21 INDEX
  22         _mallinfo_r
  23 INDEX
  24         _malloc_stats_r
  25 INDEX
  26         _mallopt_r
  27
  28 SYNOPSIS
  29         #include <malloc.h>
  30         struct mallinfo mallinfo(void);
  31         void malloc_stats(void);
  32         int mallopt(int <[parameter]>, <[value]>);
  33
  34         struct mallinfo _mallinfo_r(void *<[reent]>);
  35         void _malloc_stats_r(void *<[reent]>);
  36         int _mallopt_r(void *<[reent]>, int <[parameter]>, <[value]>);
  37
  38 DESCRIPTION
  39 <<mallinfo>> returns a structure describing the current state of
  40 memory allocation.  The structure is defined in malloc.h.  The
  41 following fields are defined: <<arena>> is the total amount of space
  42 in the heap; <<ordblks>> is the number of chunks which are not in use;
  43 <<uordblks>> is the total amount of space allocated by <<malloc>>;
  44 <<fordblks>> is the total amount of space not in use; <<keepcost>> is
  45 the size of the top most memory block.
  46
  47 <<malloc_stats>> print some statistics about memory allocation on
  48 standard error.
  49
  50 <<mallopt>> takes a parameter and a value.  The parameters are defined
  51 in malloc.h, and may be one of the following: <<M_TRIM_THRESHOLD>>
  52 sets the maximum amount of unused space in the top most block before
  53 releasing it back to the system in <<free>> (the space is released by
  54 calling <<_sbrk_r>> with a negative argument); <<M_TOP_PAD>> is the
  55 amount of padding to allocate whenever <<_sbrk_r>> is called to
  56 allocate more space.
  57
  58 The alternate functions <<_mallinfo_r>>, <<_malloc_stats_r>>, and
  59 <<_mallopt_r>> are reentrant versions.  The extra argument <[reent]>
  60 is a pointer to a reentrancy structure.
  61
  62 RETURNS
  63 <<mallinfo>> returns a mallinfo structure.  The structure is defined
  64 in malloc.h.
  65
  66 <<malloc_stats>> does not return a result.
  67
  68 <<mallopt>> returns zero if the parameter could not be set, or
  69 non-zero if it could be set.
  70
  71 PORTABILITY
  72 <<mallinfo>> and <<mallopt>> are provided by SVR4, but <<mallopt>>
  73 takes different parameters on different systems.  <<malloc_stats>> is
  74 not portable.
  75
  76 */
  77
  78 #include <_ansi.h>
  79 #include <reent.h>
  80 #include <stdlib.h>
  81 #include <malloc.h>
  82 #include <stdio.h>
  83
  84 #ifndef _REENT_ONLY
  85
  86 struct mallinfo
  87 mallinfo (void)
  88 {
  89   return _mallinfo_r (_REENT);
  90 }
  91
  92 #if !defined (_ELIX_LEVEL) || _ELIX_LEVEL >= 2
  93 void
  94 malloc_stats (void)
  95 {
  96   _malloc_stats_r (_REENT);
  97 }
  98
  99 int
 100 mallopt (int p,
 101         int v)
 102 {
 103   return _mallopt_r (_REENT, p, v);
 104 }
 105
 106 #endif /* !_ELIX_LEVEL || _ELIX_LEVEL >= 2 */
 107
 108 #endif
 109
 110 #if !defined (_ELIX_LEVEL) || _ELIX_LEVEL >= 2
 111
 112 /* mstats is now compatibility code.  It used to be real, for a
 113    previous version of the malloc routines.  It now just calls
 114    malloc_stats.  */
 115
 116 void
 117 _mstats_r (struct _reent *ptr,
 118         char *s)
 119 {
 120   _REENT_SMALL_CHECK_INIT(ptr);
 121   fiprintf (_stderr_r (ptr), "Memory allocation statistics %s\n", s);
 122   _malloc_stats_r (ptr);
 123 }
 124
 125 #ifndef _REENT_ONLY
 126 void
 127 mstats (char *s)
 128 {
 129   _mstats_r (_REENT, s);
 130 }
 131
 132 #endif
 133
 134 #endif /* !_ELIX_LEVEL || _ELIX_LEVEL >= 2 */
 135
 136 #endif /* ! defined (MALLOC_PROVIDED) */