From 6e750a757ef6fb1f41cf4c2fe39edba834b76858 Mon Sep 17 00:00:00 2001
From: Alex AUVOLAT <alex.auvolat@ens.fr>
Date: Sat, 24 May 2014 23:25:07 +0200
Subject: ./manager -local-proc 4 ./example.native does what expected.

---
 src/kahn_stdio.ml | 131 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 src/kahn_stdio.ml

(limited to 'src/kahn_stdio.ml')

diff --git a/src/kahn_stdio.ml b/src/kahn_stdio.ml
new file mode 100644
index 0000000..a149742
--- /dev/null
+++ b/src/kahn_stdio.ml
@@ -0,0 +1,131 @@
+open Unix
+
+open Util
+open Kahn
+open Proto
+
+
+module ProtoKahn: S = struct
+
+	type 'a process = (('a -> unit) option) -> unit
+
+	type 'a channel = id
+	type 'a in_port = 'a channel
+	type 'a out_port = 'a channel
+
+	let send m = Marshal.to_channel Pervasives.stdout m []; flush Pervasives.stdout
+	let read () : message = read_one_msg stdin
+
+	let task_desc t = Marshal.to_string t [Marshal.Closures]
+
+	let send_task t is_io =
+		send (GiveTask(task_desc t, is_io))
+
+	let new_channel () =
+		let x = new_id() in x, x
+	
+	let push_cont cont arg is_io =
+		match cont with
+		| None -> ()
+		| Some cont ->
+			send_task (fun () -> cont arg) is_io
+	
+	let put v prt =
+		fun cont ->
+			send (Put(prt, Marshal.to_string v []));
+			push_cont cont () false
+	
+	let get prt =
+		fun cont ->
+			send (Get(prt, 
+					task_desc
+						(fun s -> match cont with
+							| None -> ()
+							| Some cont -> cont (Marshal.from_string s 0))
+					)	
+				)
+	
+	let select pl = fun cont -> assert false
+	let select_default = fun cont -> assert false
+
+	let doco plist =
+		fun cont ->
+			let f_ch_id = new_id () in
+			List.iter
+				(fun p ->
+					send_task
+						(fun () -> p
+							(Some (fun () -> send (Put(f_ch_id, ""))))
+						)
+						false
+				) plist;
+			let rec push_x = function
+			| 0 -> push_cont cont () false
+			| n -> send (Get(f_ch_id, task_desc (fun s -> push_x (n-1))))
+			in push_x (List.length plist)
+	
+	let return v =
+		fun cont ->
+			match cont with
+			| None -> ()
+			| Some cont -> cont v
+	let bind a f =
+		fun cont ->
+			a (Some (fun va -> 
+				let b = (f va) in
+				b cont))
+	let bind_io a f = 
+		fun cont ->
+			a (Some (fun va ->
+			send_task
+				(fun () ->
+					let b = f va in
+					send_task (fun () -> b cont) false)
+				true))
+
+	let origin = ref false
+	let dbg_out = ref false
+	let dbg x = if !dbg_out then Format.eprintf "(cli) %s@." x
+
+	let parse_args () =
+		let usage = "Usage: ./program [options]" in
+		let options = [
+			"-org", Arg.Set origin, "Launch root process";
+			"-dbg", Arg.Set dbg_out, "Show debug output";
+		] in
+		Arg.parse options (fun _ -> assert false) usage
+
+	let run proc =
+		Random.self_init();
+		parse_args();
+		(* Initialize protocol *)
+		send Hello;
+		if read () <> Hello then raise (ProtocolError "Server did not say Hello correctly.");
+		(* Start task if necessary *)
+		if !origin then proc (Some (fun r -> send (FinalResult (Marshal.to_string r []))));
+		(* While there are things to do... *)
+		let result = ref None in
+		while !result = None do
+			dbg "Requesting task...";
+			send RequestTask;
+			dbg "Reading...";
+			match read() with
+			| GiveTask(td, _) ->
+				dbg "Got task!";
+				let t : task = Marshal.from_string td 0 in
+				t();
+			| GiveMsgTask(msg, td) ->
+				dbg "Got msg task!";
+				let t : msg_task = Marshal.from_string td 0 in
+				t msg;
+			| FinalResult(x) ->
+				dbg "Got result!";
+				result := Some (Marshal.from_string x 0)
+			| _ -> raise (ProtocolError "Invalid message in main loop.")
+		done;
+		(* Return result *)
+		match !result with
+		| None -> assert false
+		| Some r -> r
+		
+end
-- 
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