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|
open Util
open Khs_ast
open Khs_exec
(* TODO : channels cannot be communicated over channels, although
it should totally be possible because it's so great and so usefull ! *)
let childs = ref []
let wait_childs () =
Unix.handle_unix_error (fun () ->
List.iter (fun pid -> ignore (Unix.waitpid [] pid)) !childs)
()
let newchan proc =
let id = "khs_ch_" ^ string_of_int (Random.int 1000000)
^ "-" ^ string_of_int (Random.int 1000000) in
Unix.mkfifo ("/tmp/" ^ id) 0o666;
Many (Smap.add (psep^"in") (VStr id)
(Smap.add (psep^"out") (VStr id) Smap.empty))
let exec_proc proc =
while proc.xstatus <> PSDone do
match proc.xstatus with
| PSDone -> assert false
| PSExec | PSExecRecvd _ ->
exec_stmt proc
| PSSend(c, kv) ->
let c = str_of_kbval c in
proc.xstatus <- PSExec;
begin
if c == "stdout" then
Format.printf "%s@." (kval_descr kv)
else
let c_out = Unix.openfile ("/tmp/"^c) [Unix.O_WRONLY] 0 in
Marshal.to_channel (Unix.out_channel_of_descr c_out) kv [];
Unix.close c_out
end
| PSRecv c ->
let c = str_of_kbval c in
let c_in = Unix.openfile ("/tmp/"^c) [Unix.O_RDONLY] 0 in
let data = Marshal.from_channel (Unix.in_channel_of_descr c_in) in
proc.xstatus <- PSExecRecvd data;
Unix.close c_in
done
let spawn proc pos =
let pid = Unix.fork () in
if pid = 0 then begin
childs := [];
exec_proc { proc with xpos = pos};
wait_childs();
exit 0
end else
childs := pid::!childs
let exec_program p =
Random.init (int_of_float (Unix.time()));
let proc = {
xspawn = spawn;
xnewchan = newchan;
xprog = p;
xvals = Smap.empty;
xstatus = PSExec;
xpos = 0;
} in
proc.xvals <- Smap.add framevar (VInt 0) proc.xvals;
proc.xvals <- Smap.add "stdout" (VStr "stdout") proc.xvals;
exec_proc proc;
wait_childs()
|
