malloc_trim — release free memory from the top of the heap
#include <malloc.h>
int
malloc_trim( |
size_t pad); |
The malloc_trim() function
attempts to release free memory at the top of the heap (by
calling sbrk(2) with a suitable
argument).
The pad argument
specifies the amount of free space to leave untrimmed at the
top of the heap. If this argument is 0, only the minimum
amount of memory is maintained at the top of the heap (i.e.,
one page or less). A nonzero argument can be used to maintain
some trailing space at the top of the heap in order to allow
future allocations to be made without having to extend the
heap with sbrk(2).
The malloc_trim() function
returns 1 if memory was actually released back to the system,
or 0 if it was not possible to release any memory.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
malloc_trim() |
Thread safety | MT-Safe |
This function is automatically called by free(3) in certain
circumstances; see the discussion of M_TOP_PAD and M_TRIM_THRESHOLD in mallopt(3).
This function cannot release free memory located at places other than the top of the heap.
This function releases only memory in the main arena.
This page is part of release 4.07 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
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