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mapmalloc(3malloc)
Memory Allocation Library Functions mapmalloc(3MALLOC)
NAME
mapmalloc - memory allocator
SYNOPSIS
cc [ flag ... ] file ... -lmapmalloc [ library ... ]
#include <stdlib.h>
void *malloc(size_t size);
void *calloc(size_t nelem, size_t elsize);
void *realloc(void *ptr, size_t size);
size_t malloc_usable_size(void *ptr);
void free(void *ptr);
DESCRIPTION
The collection of malloc functions in this library use mmap(2) instead
of sbrk(2) for acquiring new heap space. The functions in this library
are intended to be used only if necessary, when applications must call
sbrk(), but need to call other library routines that might call malloc.
The algorithms used by these functions are not sophisticated. There is
no reclaiming of memory.
They operate as described on the malloc(3C) manual page, except for the
following differences:
o Space for the memory arena is obtained via mmap(2) instead
of sbrk(2).
o Support for using adi(7) is not available.
o Entry points for memalign() and valloc() are empty routines
that return failure, and are provided only to protect the
user from mixing malloc() functions from different implemen‐
tations. This will also cause calls to aligned_alloc(3C) and
posix_memalign(3C) to fail.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ MT-LevelSafe
USAGE
See malloc(3C) for an overview and comparison of all the allocation
libraries provided by Oracle Solaris.
SEE ALSO
brk(2), mmap(2), malloc(3C), libmapmalloc(3LIB), attributes(7)
Oracle Solaris 11.4 7 Feb 2019 mapmalloc(3MALLOC)