added a proper environment variable system rather than just sticking stuff in the process' table

module/sched.lua

@@ -1,13 +1,19 @@
-tTasks,nPid,nTimeout,cPid = {},1,1,0
+do
-function os.spawn(f,n)
+tTasks,nPid,nTimeout,cPid = {},1,1,0 -- table of tasks, next process ID, event timeout, current PID
- tTasks[nPid] = {["c"]=coroutine.create(f),["n"]=n,["p"]=nPid}
+function os.spawn(f,n) -- creates a process from function *f* with name *n*
- for k,v in pairs(tTasks[cPid] or {}) do
+ tTasks[nPid] = {["c"]=coroutine.create(f),["n"]=n,["p"]=nPid,e={}}
-  tTasks[nPid][k] = tTasks[nPid][k] or v
+ 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 sched()
+function os.kill(pid) -- removes process *pid* from the task list
+ tTasks[pid] = nil
+end
+function sched() -- the actual scheduler function
  while #tTasks > 0 do
   local tEv = {computer.pullSignal(nTimeout)}
   for k,v in pairs(tTasks) do
@@ -20,3 +26,14 @@ function sched()
   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