From 4a5ca97b0970e191332fb6fb4684a397b93390f5 Mon Sep 17 00:00:00 2001
From: Alex AUVOLAT <alex.auvolat@ens.fr>
Date: Sun, 25 May 2014 01:00:44 +0200
Subject: ./manager -pool-addr mypool -pool-count 16 -my-addr my_addr
 ./example.native

---
 src/poolclient.ml | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 src/poolclient.ml

(limited to 'src/poolclient.ml')

diff --git a/src/poolclient.ml b/src/poolclient.ml
new file mode 100644
index 0000000..00b0d35
--- /dev/null
+++ b/src/poolclient.ml
@@ -0,0 +1,72 @@
+open Unix
+open Util
+open Proto
+
+let pool_port = ref 9082
+let pool_server = ref ""
+let provide = ref 4
+
+let fullfill_request task (addr, port) n =
+	for i = 0 to n-1 do
+		Format.eprintf "Spawn %s@." task;
+		if fork() = 0 then begin
+			let sock = socket PF_INET SOCK_STREAM 0 in
+			connect sock (make_addr addr port);
+			dup2 sock stdin;
+			dup2 sock stdout;
+			execv task [|task|]
+		end
+	done
+
+let run_client () =
+	let sock = socket PF_INET SOCK_STREAM 0 in
+	connect sock (make_addr !pool_server !pool_port);
+	Format.eprintf "Connected.@.";
+
+	let outc = out_channel_of_descr sock in
+	let send m = Marshal.to_channel outc m []; flush outc in
+
+	send PoolHello;
+	if read_one_msg sock <> PoolHello then
+		raise (ProtocolError "Expected PoolHello reply.");
+	
+	Format.eprintf "Provide %d@." !provide;
+	send (PoolProvide !provide);
+
+	let cont = ref true in
+	while !cont do
+		let qi, _, qe = select [sock] [] [sock] 1.0 in
+		begin match qi, qe with
+		| a::_, _ ->
+			begin match read_one_msg sock with
+			| PoolRequest(task, addr, n) ->
+				fullfill_request task addr n
+			| _ -> raise (ProtocolError "Unexpected message.")
+			end
+		| _, b::_ ->
+			shutdown sock SHUTDOWN_ALL;
+			close sock;
+			cont := false
+		| _ -> ()
+		end;
+		try match waitpid [WNOHANG] (-1) with
+		| x, _ when x > 0 ->
+			send (PoolProvide 1)
+		| _ -> ()
+		with _ -> ()
+	done
+
+let () =
+	let usage = "Usage: ./poolclient [options] server" in
+	let options = [
+		"-port", Arg.Set_int pool_port, "Set port for pooling server.";
+		"-provide", Arg.Set_int provide, "Number of processes to provide.";
+	] in
+	Arg.parse options (fun s -> pool_server := s) usage;
+
+	if !pool_server = "" then begin
+		Format.eprintf "%s@." usage;
+		exit 0
+	end;
+
+	run_client ()
-- 
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