mirror of
https://github.com/20kdc/OC-KittenOS.git
synced 2024-11-09 03:58:08 +11:00
107 lines
2.8 KiB
Lua
107 lines
2.8 KiB
Lua
-- This is released into the public domain.
|
|
-- No warranty is provided, implied or otherwise.
|
|
|
|
-- event: Implements pull/listen semantics in a consistent way for a given process.
|
|
-- This is similar in API to OpenOS's event framework, but is per-process.
|
|
-- To make this work, a function is shared.
|
|
-- This function needs access to the caller's NEO in order to ensure that NEO system functions are covered.
|
|
-- This can do less checks than usual as it only affects the caller.
|
|
|
|
-- Global forces reference to prevent duplication
|
|
newEvent = function (neo)
|
|
local listeners = {}
|
|
local translations = {}
|
|
local timers = {}
|
|
local oldRA = neo.requestAccess
|
|
local function doPush(tp, tag, ...)
|
|
if tp == "k.timer" then
|
|
local f = timers[tag]
|
|
timers[tag] = nil
|
|
if f then
|
|
f(...)
|
|
end
|
|
end
|
|
local listeners2 = {}
|
|
for k, _ in pairs(listeners) do
|
|
table.insert(listeners2, k)
|
|
end
|
|
for _, v in ipairs(listeners2) do
|
|
v(tp, tag, ...)
|
|
end
|
|
end
|
|
neo.requestAccess = function (perm, handler)
|
|
return oldRA(perm, function (...)
|
|
doPush(...)
|
|
if handler then
|
|
handler(...)
|
|
end
|
|
end)
|
|
end
|
|
local function doPull()
|
|
local ev = {coroutine.yield()}
|
|
doPush(table.unpack(ev))
|
|
return ev
|
|
end
|
|
return {
|
|
listen = function (p1, p2)
|
|
if type(p2) == "function" then
|
|
local t = function (...)
|
|
local evn = ...
|
|
if evn == p1 then
|
|
p2(...)
|
|
end
|
|
end
|
|
translations[p2] = t
|
|
listeners[t] = true
|
|
else
|
|
listeners[p1] = true
|
|
end
|
|
end,
|
|
ignore = function (func)
|
|
if translations[func] then
|
|
listeners[translations[func]] = nil
|
|
translations[func] = nil
|
|
end
|
|
listeners[func] = nil
|
|
end,
|
|
-- Arguments are filtering.
|
|
-- For example, to filter for timers with a given tag, use pull("k.timer", tag)
|
|
-- Note the explicit discouragement of timeout-pulls. Use runAt or the complex form of sleep.
|
|
pull = function (...)
|
|
local filter = {...}
|
|
while true do
|
|
local ev = doPull()
|
|
local err = false
|
|
for i = 1, #filter do
|
|
err = err or (filter[i] ~= ev[i])
|
|
end
|
|
if not err then return table.unpack(ev) end
|
|
end
|
|
end,
|
|
-- Run a function at a specified uptime.
|
|
runAt = function (time, func)
|
|
timers[neo.scheduleTimer(time)] = func
|
|
end,
|
|
-- Sleeps until a time (unless time is nil, in which case sleeps forever), but can be woken up before then.
|
|
-- This allows using an async API as a synchronous one with optional time-to-failure.
|
|
sleepTo = function (time, wakeUpPoll)
|
|
local timerHit = false
|
|
local oWUP = wakeUpPoll
|
|
wakeUpPoll = function ()
|
|
if oWUP then
|
|
return timerHit or (oWUP())
|
|
end
|
|
return timerHit
|
|
end
|
|
if time then
|
|
timers[neo.scheduleTimer(time)] = function () timerHit = true end
|
|
end
|
|
while true do
|
|
local ev = doPull()
|
|
if wakeUpPoll() then return end
|
|
end
|
|
end
|
|
}
|
|
end
|
|
return newEvent
|