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Bubberstation/code/datums/components/wearertargeting.dm
SkyratBot e65a48e91f [MIRROR] Adds SIGNAL_HANDLER and SIGNAL_HANDLER_DOES_SLEEP to prevent signal callbacks from blocking (#430)
* Adds SIGNAL_HANDLER and SIGNAL_HANDLER_DOES_SLEEP to prevent signal callbacks from blocking (#52761)

Adds SIGNAL_HANDLER, a macro that sets SHOULD_NOT_SLEEP(TRUE). This should ideally be required on all new signal callbacks.

Adds BLOCKING_SIGNAL_HANDLER, a macro that does nothing except symbolize "this is an older signal that didn't necessitate a code rewrite". It should not be allowed for new work.

This comes from discussion around #52735, which yields by calling input, and (though it sets the return type beforehand) will not properly return the flag to prevent attack from slapping.

To fix 60% of the yielding cases, WrapAdminProcCall no longer waits for another admin's proc call to finish. I'm not an admin, so I don't know how many behinds this has saved, but if this is problematic for admins I can just make it so that it lets you do it anyway. I'm not sure what the point of this babysitting was anyway.

Requested by @optimumtact.
Changelog

cl
admin: Calling a proc while another admin is calling one will no longer wait for the first to finish. You will simply just have to call it again.
/cl

* Adds SIGNAL_HANDLER and SIGNAL_HANDLER_DOES_SLEEP to prevent signal callbacks from blocking

Co-authored-by: Jared-Fogle <35135081+Jared-Fogle@users.noreply.github.com>
2020-08-19 20:17:28 -04:00

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// A dummy parent type used for easily making components that target an item's wearer rather than the item itself.
/datum/component/wearertargeting
var/list/valid_slots = list()
var/list/signals = list()
var/proctype = .proc/pass
var/mobtype = /mob/living
/datum/component/wearertargeting/Initialize()
if(!isitem(parent))
return COMPONENT_INCOMPATIBLE
RegisterSignal(parent, COMSIG_ITEM_EQUIPPED, .proc/on_equip)
RegisterSignal(parent, COMSIG_ITEM_DROPPED, .proc/on_drop)
/datum/component/wearertargeting/proc/on_equip(datum/source, mob/equipper, slot)
SIGNAL_HANDLER
if((slot in valid_slots) && istype(equipper, mobtype))
RegisterSignal(equipper, signals, proctype, TRUE)
else
UnregisterSignal(equipper, signals)
/datum/component/wearertargeting/proc/on_drop(datum/source, mob/user)
SIGNAL_HANDLER
UnregisterSignal(user, signals)