175 lines
4.4 KiB
Lua
175 lines
4.4 KiB
Lua
local mt = {}
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mt.newPool = function(pool_options)
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pool_options = pool_options or {}
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local pool = {}
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pool.threads = {} -- indexed by coroutines, contains their metadata
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pool.namedThreads = {} -- indexed by coroutine names, contains their metadata also.
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pool.byID = {} -- aaaa bees
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-- coroutines are named if their metadata has a name field.
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pool.threadcount = 0 -- used for detecting when all things in a pool are depleted
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pool.id = math.random(1,99999999999999)
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pool.clear = function()
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pool.threads = {}
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pool.namedThreads = {}
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pool.byID = {}
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pool.threadcount = 0
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end
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local idcount = 0
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pool.add = function(fn, options)
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options = options or {}
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if not fn then error("expected function",2) end
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options.co = coroutine.create(function() local retv = fn(options) if retv~=nil then options.retv=retv end os.queueEvent("ignore_this") end)
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options.fn = fn
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options.id = idcount
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idcount = idcount + 1
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pool.threads[options.co] = options
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if options.name then
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pool.namedThreads[options.name] = options
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end
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pool.byID[options.id] = options
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pool.threadcount = pool.threadcount + 1
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os.queueEvent("pool_fn_added",options,pool)
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return options
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end
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pool.rm = function(name)
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local tr = nil
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if type(name) == "string" then
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if not pool.namedThreads[name] then
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error("no thread with name "..name)
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end
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tr = pool.namedThreads[name]
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elseif type(name)=="number" then
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if not pool.byID[name] then
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error("no thread with ID "..name)
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end
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tr = pool.byID[name]
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else
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tr = name
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end
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tr = pool.byID[tr.id]
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os.queueEvent("pool_fn_end",tr.id,pool.id)
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pool.threads[tr.co] = nil
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if type(name)=="string" then pool.namedThreads[name] = nil end
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pool.byID[name] = nil
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pool.threadcount = pool.threadcount - 1
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return true
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end
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pool.addFile = function(filename, options)
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pool.add(function()
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dofile(filename)
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end,options)
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end
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pool.run = function(terminable)
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terminable = terminable == true -- if false, terminate events will be echoed to coroutines instead of
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-- terminating this pool
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while true do
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local event = {coroutine.yield()}
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if event[1] == "terminate" and terminable then
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return
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end
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for thread, options in pairs(pool.threads) do
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if coroutine.status(thread) ~= "dead" then
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if event[1] == options.filter or options.filter == nil then
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local x,e = coroutine.resume(thread,unpack(event))
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if not x then
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os.queueEvent("pool_fn_crash",options.id,pool.id,e)
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pool.rm(options)
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if pool_options.crash_on_error then
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error(e)
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end
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else
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options.filter = e
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end
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end
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else
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pool.rm(options)
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end
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end
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if pool.threadcount == 0 then return end
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end
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end
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pool.await = function(...)
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local args = {...}
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local retv = {}
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for i,v in ipairs(args) do
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local to_match = nil
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if type(v) == "table" then
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to_match = v.id
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elseif type(v) == "thread" then
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to_match = pool.threads[v].id
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elseif type(name)=="number" then
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if not pool.byID[name] then
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error("no thread with ID "..name)
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end
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to_match = name
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else
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if not pool.namedThreads[v] then
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error("no thread named "..v)
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return
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end
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to_match = pool.namedThreads[v].id
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end
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if coroutine.status(pool.byID[to_match].co) == "dead" then
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table.insert(retv, pool.byID[to_match].retv)
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else
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while true do
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local e, b, c, d = os.pullEvent()
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if (e=="pool_fn_end" or e=="pool_fn_crash") then
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if c == pool.id and b == to_match then
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table.insert(retv, pool.byID[b].retv)
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break
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end
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end
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end
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end
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end
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return unpack(retv)
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end
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pool.await_any = function(...)
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local args = {...}
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local match = {}
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for i,v in ipairs(args) do
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local to_match = nil
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if type(v) == "table" then
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to_match = v.id
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elseif type(name)=="number" then
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if not pool.byID[name] then
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error("no thread with ID "..name)
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end
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to_match = name
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else
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if not pool.namedThreads[v] then
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error("no thread named "..v)
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return
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end
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to_match = pool.namedThreads[v].id
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end
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if coroutine.status(pool.byID[to_match].co) == "dead" then
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return pool.byID[to_match].retv
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end
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table.insert(match,to_match)
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end
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while true do
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local e, b, c, d = os.pullEvent()
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if e=="pool_fn_end" and c == pool.id then
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for i,v in ipairs(match) do
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if b == v then
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return pool.byID[v].retv
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end
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end
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end
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end
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end
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return pool
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end
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return mt
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