OC-PsychOS2/module/sched.lua

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do
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local tTasks,nPid,nTimeout,cPid = {},1,1,0 -- table of tasks, next process ID, event timeout, current PID
function os.spawn(f,n) -- creates a process from function *f* with name *n*
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tTasks[nPid] = {
c=coroutine.create(f), -- actual coroutine
n=n, -- process name
p=nPid, -- process PID
P=cPid, -- parent PID
e={} -- environment variables
}
if tTasks[cPid] then
for k,v in pairs(tTasks[cPid].e) do
tTasks[nPid].e[k] = tTasks[nPid].e[k] or v
end
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end
nPid = nPid + 1
return nPid - 1
end
function os.kill(pid) -- removes process *pid* from the task list
tTasks[pid] = nil
end
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function os.pid()
return cPid
end
function os.tasks()
local rt = {}
for k,v in pairs(tTasks) do
rt[#rt+1] = k
end
return rt
end
function os.taskInfo(pid)
pid = pid or os.pid()
if not tTasks[pid] then return false end
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return {name=tTasks[pid].n,parent=tTasks[pid].P}
end
function os.sched() -- the actual scheduler function
os.sched = nil
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while #tTasks > 0 do
local tEv = {computer.pullSignal(nTimeout)}
for k,v in pairs(tTasks) do
if coroutine.status(v.c) ~= "dead" then
cPid = k
coroutine.resume(v.c,table.unpack(tEv))
else
tTasks[k] = nil
end
end
end
end
function os.setenv(k,v) -- set's the current process' environment variable *k* to *v*, which is passed to children
if tTasks[cPid] then
tTasks[cPid].e[k] = v
end
end
function os.getenv(k) -- gets a process' *k* environment variable
if tTasks[cPid] then
return tTasks[cPid].e[k]
end
end
end