1 /* ping - ping/pong demo of GRAS features */
3 /* Copyright (c) 2006, 2007, 2009, 2010. The SimGrid Team.
4 * All rights reserved. */
6 /* This program is free software; you can redistribute it and/or modify it
7 * under the terms of the license (GNU LGPL) which comes with this package. */
11 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(Ping);
13 /* Global private data */
20 static int server_cb_ping_handler(gras_msg_cb_ctx_t ctx, void *payload)
24 /* 1. Get the payload into the msg variable, and retrieve my caller */
25 int msg = *(int *) payload;
26 gras_socket_t expeditor = gras_msg_cb_ctx_from(ctx);
28 /* 2. Retrieve the server's state (globals) */
30 server_data_t *globals = (server_data_t *) gras_userdata_get();
31 globals->endcondition = 0;
33 /* 3. Log which client connected */
34 INFO3(">>>>>>>> Got message PING(%d) from %s:%d <<<<<<<<",
36 gras_socket_peer_name(expeditor),
37 gras_socket_peer_port(expeditor));
39 /* 4. Change the value of the msg variable */
41 /* 5. Send it back as payload of a pong message to the expeditor */
43 gras_msg_send(expeditor, "pong", &msg);
45 /* 6. Deal with errors: add some details to the exception */
47 gras_socket_close(globals->sock);
48 RETHROW0("Unable answer with PONG: %s");
51 INFO0(">>>>>>>> Answered with PONG(4321) <<<<<<<<");
53 /* 7. Set the endcondition boolean to true (and make sure the server stops after receiving it). */
54 globals->endcondition = 1;
56 /* 8. Tell GRAS that we consummed this message */
58 } /* end_of_server_cb_ping_handler */
60 int server(int argc, char *argv[])
62 server_data_t *globals;
66 /* 1. Init the GRAS infrastructure and declare my globals */
67 gras_init(&argc, argv);
68 globals = gras_userdata_new(server_data_t);
70 /* 2. Get the port I should listen on from the command line, if specified */
75 INFO1("Launch server (port=%d)", port);
77 /* 3. Create my master socket */
78 globals->sock = gras_socket_server(port);
80 /* 4. Register the known messages. This function is called twice here, but it's because
81 this file also acts as regression test, no need to do so yourself of course. */
82 ping_register_messages();
83 ping_register_messages(); /* just to make sure it works ;) */
85 /* 5. Register my callback */
86 gras_cb_register("ping", &server_cb_ping_handler);
88 INFO1(">>>>>>>> Listening on port %d <<<<<<<<",
89 gras_socket_my_port(globals->sock));
90 globals->endcondition = 0;
92 /* 6. Wait up to 10 minutes for an incomming message to handle */
93 gras_msg_handle(10.0);
96 if (!globals->endcondition)
98 ("An error occured, the endcondition was not set by the callback");
100 /* 8. Free the allocated resources, and shut GRAS down */
101 gras_socket_close(globals->sock);
107 } /* end_of_server */