1 /* spawn - demo of the gras_agent_spawn function */
3 /* Copyright (c) 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(Spawn);
13 /* Global private data */
20 static int father_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 father's state (globals) */
29 father_data_t *globals = (father_data_t *) gras_userdata_get();
32 /* 3. Log which client connected */
33 INFO3("Kid %s:%d pinged me with %d",
34 gras_socket_peer_name(expeditor), gras_socket_peer_port(expeditor),
37 /* 4. Change the value of the msg variable */
39 /* 5. Send it back as payload of a pong message to the expeditor */
41 gras_msg_send(expeditor, "pong", &msg);
43 /* 6. Deal with errors: add some details to the exception */
45 gras_socket_close(globals->sock);
46 RETHROW0("Unable to answer to my poor child: %s");
48 INFO2("Answered to %s:%d's request",
49 gras_socket_peer_name(expeditor), gras_socket_peer_port(expeditor));
51 /* 7. Tell GRAS that we consummed this message */
53 } /* end_of_father_cb_ping_handler */
55 int father(int argc, char *argv[])
57 father_data_t *globals;
64 /* 1. Init the GRAS infrastructure and declare my globals */
65 gras_init(&argc, argv);
66 globals = gras_userdata_new(father_data_t);
68 /* 2. Get args from the command line, if specified */
71 child_amount = atoi(argv[2]);
74 /* 3. Initialize my globals (mainly create my master socket) */
75 globals->sock = gras_socket_server(port);
78 /* 4. Register the known messages. */
79 spawn_register_messages();
81 /* 5. Register my callback */
82 gras_cb_register("ping", &father_cb_ping_handler);
84 /* 6. Spawn the kids */
85 INFO0("Spawn the kids");
86 for (i = 0; i < child_amount; i++) {
87 child_args = xbt_new0(char *, 3);
88 child_args[0] = xbt_strdup("child");
89 child_args[1] = bprintf("%d", port);
91 gras_agent_spawn("child", NULL, child, 2, child_args, NULL);
94 /* 7. Wait to be contacted be the kids */
95 while (globals->msg_got < child_amount)
96 gras_msg_handle(60.0);
97 INFO0("All kids gone. Leave now.");
99 /* 8. Free the allocated resources, and shut GRAS down */
100 gras_socket_close(globals->sock);
105 } /* end_of_father */