mirror of
https://github.com/mpv-player/mpv
synced 2024-12-29 10:32:15 +00:00
40 lines
1.7 KiB
Plaintext
40 lines
1.7 KiB
Plaintext
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.
|