Skip to content

Files

Latest commit

author
wm4
Apr 15, 2017
bbfafb5 · Apr 15, 2017

History

History
This branch is 9127 commits behind mpv-player/mpv:master.

ta

Folders and files

NameName
Last commit message
Last commit date

parent directory

..
Oct 13, 2014
Apr 15, 2017
Apr 15, 2017
Apr 15, 2017
Apr 15, 2017
Apr 15, 2017
TA ("Tree Allocator") is a wrapper around malloc() and related functions,
adding features like automatically freeing sub-trees of memory allocations if
a parent allocation is freed.

Generally, the idea is that every TA allocation can have a parent (indicated
by the ta_parent argument in allocation function calls). If a parent is freed,
its child allocations are automatically freed as well. It is also allowed to
free a child before the parent, or to move a child to another parent with
ta_set_parent().

It also provides a bunch of convenience macros and debugging facilities.

The TA functions are documented in the implementation files (ta.c, ta_utils.c).

TA is intended to be useable as library independent from mpv. It doesn't
depend on anything mpv specific.

Note:
-----

mpv doesn't use the TA API yet for two reasons: first, the TA API is not
necessarily finalized yet. Second, it should be easily possible to revert
the commit adding TA, and changing all the code would not allow this.

Especially the naming schema for some TA functions is still somewhat
undecided. (The talloc naming is a bit verbose at times.)

For now, mpv goes through a talloc wrapper, which maps the talloc API to TA.
New code should still use talloc as well. At one point, all talloc calls
will be replaced with TA calls, and the talloc wrapper will be removed.

Documentation for the talloc API is here:

    http://talloc.samba.org/talloc/doc/html/modules.html

There are some minor differences with mpv's talloc bridge. mpv calls abort()
on allocation failures, and the talloc_set_destructor() signature is slightly
different. libtalloc also has a weird 256MB limit per allocation. The talloc
wrapper supports only a strict subset of libtalloc functionality used by mpv.