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timer.lua
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timer.lua
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-- https://github.com/davisdude/Timer
--[[
Copyright (c) 2016 Davis Claiborne
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
]]
--[[
TODO:
- Decide how to handle timers where signal is called again (currently signal is removed)
- Allow loops (i.e. thread "A" signals "D" which, after its completion, signals "A" again).
- Asynchronous code (i.e. 2 loops can call a thread independently).
- Nonlinear code (i.e. skip over segments to a waitSignal in the same thread)
- Expose 'signal' outside of func environment, that way signals can be executed without having to create a new timer.
- Error checking for signalled functions
]]
local signals = {}
local function resumeCoroutine( co, ... )
local passed, err = coroutine.resume( co, ... )
assert( passed, 'Timer error: ' .. tostring( err ) )
return passed
end
local function wait( process, seconds )
local co = coroutine.running()
local wakeUpTime = process.time + seconds
process.times[co] = wakeUpTime
return coroutine.yield( co )
end
local function checkThreads( process )
for co, wakeUpTime in pairs( process.times ) do
if process.time > wakeUpTime then
process.times[co] = nil
resumeCoroutine( co )
end
end
end
local function waitSignal( name )
local co = coroutine.running()
if signals[name] then
table.insert( signals[name], co )
else
signals[name] = { co }
end
return coroutine.yield( co )
end
local toResume = {} -- Prevent bugs caused by coroutines starting then pausing wrong thread
local function signal( name )
for i, co in ipairs( signals[name] ) do
if coroutine.status( co ) == 'suspended' then
table.insert( toResume, co )
end
end
signals[name] = nil
end
-- Wrapper function
local function newProcess( func )
local process = {
time = 0,
times = {},
update = function( self, dt )
self.time = self.time + dt
checkThreads( self )
for _, co in ipairs( toResume ) do
resumeCoroutine( co )
end
toResume = {}
end,
}
setfenv( func,
setmetatable( {
waitSignal = waitSignal,
signal = signal,
wait = function( seconds )
process.time = 0
return wait( process, seconds )
end,
}, {
__index = getfenv( 0 ),
} )
)
local co = coroutine.create( func )
resumeCoroutine( co )
return process
end
return {
new = newProcess,
wait = wait,
}