mirror of
https://github.com/mpv-player/mpv
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40 lines
1.7 KiB
Plaintext
40 lines
1.7 KiB
Plaintext
TA ("Tree Allocator") is a wrapper around malloc() and related functions,
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adding features like automatically freeing sub-trees of memory allocations if
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a parent allocation is freed.
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Generally, the idea is that every TA allocation can have a parent (indicated
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by the ta_parent argument in allocation function calls). If a parent is freed,
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its child allocations are automatically freed as well. It is also allowed to
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free a child before the parent, or to move a child to another parent with
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ta_set_parent().
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It also provides a bunch of convenience macros and debugging facilities.
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The TA functions are documented in the implementation files (ta.c, ta_utils.c).
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TA is intended to be useable as library independent from mpv. It doesn't
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depend on anything mpv specific.
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Note:
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-----
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mpv doesn't use the TA API yet for two reasons: first, the TA API is not
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necessarily finalized yet. Second, it should be easily possible to revert
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the commit adding TA, and changing all the code would not allow this.
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Especially the naming schema for some TA functions is still somewhat
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undecided. (The talloc naming is a bit verbose at times.)
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For now, mpv goes through a talloc wrapper, which maps the talloc API to TA.
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New code should still use talloc as well. At one point, all talloc calls
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will be replaced with TA calls, and the talloc wrapper will be removed.
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Documentation for the talloc API is here:
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https://talloc.samba.org/talloc/doc/html/group__talloc.html
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There are some minor differences with mpv's talloc bridge. mpv calls abort()
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on allocation failures, and the talloc_set_destructor() signature is slightly
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different. libtalloc also has a weird 256MB limit per allocation. The talloc
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wrapper supports only a strict subset of libtalloc functionality used by mpv.
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