Re: Weird numeric for loop counter variable behavior
- From: Cheyi Lin <cheyi.lin@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Fri, 7 Mar 2014 15:26:32 +0800
Thanks for the replies,
Sorry about lack of related context, here it is, foo.lua and main.lua.
'Foo' is an simple event emitter module, you push a handler function,
register an event with callback and wait for be triggered.
The problem I posted is the handler function in main.lua.
I embedded LuaJIT 2.0.2 (git e3d5b21) in C, an event-driven server
application, with a 'tick' timer that invokes a top level Lua function
periodically to processing queued events one by one.
I'm still digging the possible logical bugs, if you need any
information please let me know, thanks.
Regards,
Cheyi
-- [ foo.lua ]
local setmetatable = setmetatable
local type = type
local table = table
local Foo = {}
function Foo:new()
local obj = {
handler_stack = {},
event_map = {},
}
setmetatable(obj, self)
self.__index = self
return obj
end
function Foo:push_handler(handler)
if type(handler) == "function" then
table.insert(self.handler_stack, handler)
end
end
function Foo:pop_handler(handler)
return table.remove(self.handler_stack)
end
function Foo:register_event(event_id, event_cb)
if type(event_cb) == "function" then
self.event_map[event_id] = event_cb
end
end
function Foo:trigger_event(event_id)
local event_cb = self.event_map[event_id]
if event_cb then
self.event_map[event_id] = nil
event_cb(self)
end
end
return Foo
-- end of foo.lua
-- [ main.lua ]
local Foo = require("foo")
local N = 4
foo = Foo:new()
bar =
function (foo, i)
-- do something irrelevant
end
foo:push_handler(
function ()
for i = 1, N do -- // PROBLEM HERE //
print(i)
bar(foo, i)
end
end)
foo:register_event("my_event",
function ()
local h = foo:pop_handler()
if h then h() end
end)
foo:trigger_event("my_event")
-- end of main.lua
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