освободить свободную память из кучи (release free memory from the heap)
Имя (Name)
malloc_trim - release free memory from the heap
Синопсис (Synopsis)
#include <malloc.h>
int malloc_trim(size_t pad);
Описание (Description)
The malloc_trim() function attempts to release free memory from
the heap (by calling sbrk(2) or madvise(2) with suitable
arguments).
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).
Возвращаемое значение (Return value)
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.
Ошибки (Error)
No errors are defined.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│malloc_trim() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
This function is a GNU extension.
Примечание (Note)
Only the main heap (using sbrk(2)) honors the pad argument;
thread heaps do not.
Since glibc 2.8 this function frees memory in all arenas and in
all chunks with whole free pages.
Before glibc 2.8 this function only freed memory at the top of
the heap in the main arena.
Смотри также (See also)
sbrk(2), malloc(3), mallopt(3)
