[lttv.git] / tags / lttv-0.11.3-23102008 / doc / developer / lttv_hook_prio.txt

Linux Trace Toolkit

Mathieu Desnoyers 18-05-2004


Seeing that a very precise hook call ordering is needed when processing events
(especially the order for calling state update hooks and event delivery hooks),
this document defines a new type and interface that permits to merge all kind of
hooks, eventually sorted by the priority associated to them.

- Type LttvHooks with priorities

This is a modification to the actual LttvHooks that associates a priority with
each hook. The container for this type would be a garray, just like hook.c, but
hooks would be added at the right position in the list, by priority. Hooks in a
hook list are ordered by priority : from highest priority (0) to
lowest (99). The default priority is 50 (defined as LTTV_PRIO_DEFAULT).

A new lttv_hooks_call_merge that will get the hooks from two hook lists in the
right order will deal with the multiple lists priority problem.
Commit	Line	Data
13ab9fcb	1	Linux Trace Toolkit
	2
	3	Mathieu Desnoyers 18-05-2004
	4
	5
	6	Seeing that a very precise hook call ordering is needed when processing events
	7	(especially the order for calling state update hooks and event delivery hooks),
	8	this document defines a new type and interface that permits to merge all kind of
	9	hooks, eventually sorted by the priority associated to them.
	10
	11	- Type LttvHooks with priorities
	12
	13	This is a modification to the actual LttvHooks that associates a priority with
	14	each hook. The container for this type would be a garray, just like hook.c, but
	15	hooks would be added at the right position in the list, by priority. Hooks in a
	16	hook list are ordered by priority : from highest priority (0) to
	17	lowest (99). The default priority is 50 (defined as LTTV_PRIO_DEFAULT).
	18
	19	A new lttv_hooks_call_merge that will get the hooks from two hook lists in the
	20	right order will deal with the multiple lists priority problem.
	21
	22
	23
	24