do 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* 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 end nPid = nPid + 1 return nPid - 1 end function os.kill(pid) -- removes process *pid* from the task list tTasks[pid] = nil end 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) return {name=tTasks[pid].n,parent=tTasks[pid].P} end function os.sched() -- the actual scheduler function os.sched = nil 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