+++ /dev/null
-/* stoken - simple/static token ring */
-
-/* Copyright (c) 2006, 2007, 2009, 2010. The SimGrid Team.
- * All rights reserved. */
-
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
-
-#include "gras.h"
-
-#define NBLOOPS 3
-/*#define NBLOOPS 30000*/
-
-XBT_LOG_NEW_DEFAULT_CATEGORY(SimpleToken,
- "Messages specific to this example");
-
-/* Function prototypes */
-int node(int argc, char *argv[]);
-
-
-/* **********************************************************************
- * Node code
- * **********************************************************************/
-
-/* Global private data */
-typedef struct {
- gras_socket_t sock; /* server socket on which I hear */
- int remaining_loop; /* number of loops to do until done */
- int create; /* whether I have to create the token */
- gras_socket_t tosuccessor; /* how to connect to the successor on ring */
- double start_time; /* to measure the elapsed time. Only used by the
- node that creates the token */
-} node_data_t;
-
-
-/* Callback function */
-static int node_cb_stoken_handler(gras_msg_cb_ctx_t ctx, void *payload)
-{
- /* 1. Get the payload into the msg variable, and retrieve my caller */
- int msg = *(int *) payload;
- gras_socket_t expeditor = gras_msg_cb_ctx_from(ctx);
-
-
- /* 2. Retrieve the node's state (globals) */
- node_data_t *globals = (node_data_t *) gras_userdata_get();
-
- /* 3. Log which predecessor connected */
- int supersteps = 1; /* only log every superstep loop */
- if (NBLOOPS >= 1000) {
- supersteps = 100;
- } else if (NBLOOPS >= 100) {
- supersteps = 10;
- } else if (NBLOOPS <= 10) {
- supersteps = 1;
- }
- if (globals->create && (!(globals->remaining_loop % supersteps))) {
- XBT_INFO("Begin a new loop. Still to do: %d", globals->remaining_loop);
- } else if (!(globals->remaining_loop % supersteps)) {
- XBT_VERB("Got token(%d) from %s remaining_loop=%d",
- msg, gras_socket_peer_name(expeditor), globals->remaining_loop);
- }
-
- /* 4. If the right shouldn't be stopped yet */
- if (globals->remaining_loop > 0) {
- msg += 1;
-
- XBT_DEBUG("Send token(%d) to %s:%d", msg,
- gras_socket_peer_name(globals->tosuccessor),
- gras_socket_peer_port(globals->tosuccessor));
-
- /* 5. Send the token as payload of a stoken message to the successor */
- TRY {
- gras_msg_send(globals->tosuccessor, "stoken", &msg);
-
- /* 6. Deal with errors */
- }
- CATCH_ANONYMOUS {
- gras_socket_close(globals->sock);
- RETHROWF("Unable to forward token: %s");
- }
-
- }
-
- /* DO NOT CLOSE THE expeditor SOCKET since the client socket is
- reused by our predecessor.
- Closing this side would thus create troubles */
-
- /* 7. Decrease the remaining_loop integer. */
- globals->remaining_loop -= 1;
-
- /* 8. Repport the hop number to the user at the end */
- if (globals->remaining_loop == -1 && globals->create) {
- double elapsed = gras_os_time() - globals->start_time;
- XBT_INFO("Shut down the token-ring. There was %d hops.", msg);
- XBT_VERB("Elapsed time: %g", elapsed);
- }
-
- /* 9. Tell GRAS that we consummed this message */
- return 0;
-} /* end_of_node_cb_stoken_handler */
-
-int node(int argc, char *argv[])
-{
- node_data_t *globals;
-
- const char *host;
- int myport;
- int peerport;
-
- /* 1. Init the GRAS infrastructure and declare my globals */
- gras_init(&argc, argv);
- globals = gras_userdata_new(node_data_t);
-
-
- /* 2. Get the successor's address. The command line overrides
- defaults when specified */
- host = "127.0.0.1";
- myport = 4000;
- peerport = 4000;
- if (argc >= 4) {
- myport = atoi(argv[1]);
- host = argv[2];
- peerport = atoi(argv[3]);
- }
-
- /* 3. Save successor's address in global var */
- globals->remaining_loop = NBLOOPS;
- globals->create = 0;
- globals->tosuccessor = NULL;
-
- if (!gras_os_getpid() % 100 || gras_if_RL())
- XBT_INFO("Launch node listening on %d (successor on %s:%d)",
- myport, host, peerport);
-
- /* 4. Register the known messages. */
- gras_msgtype_declare("stoken", gras_datadesc_by_name("int"));
-
- /* 5. Create my master socket for listening */
- globals->sock = gras_socket_server(myport);
- gras_os_sleep(1.0); /* Make sure all server sockets are created */
-
- /* 6. Create socket to the successor on the ring */
- XBT_DEBUG("Connect to my successor on %s:%d", host, peerport);
-
- globals->tosuccessor = gras_socket_client(host, peerport);
-
- /* 7. Register my callback */
- gras_cb_register("stoken", &node_cb_stoken_handler);
-
- /* 8. One node has to create the token at startup.
- It's specified by a command line argument */
- if (argc >= 5
- && !strncmp("--create-token", argv[4], strlen("--create-token")))
- globals->create = 1;
-
- if (globals->create) {
- int token = 0;
-
- globals->start_time = gras_os_time();
-
- globals->remaining_loop = NBLOOPS - 1;
-
- XBT_INFO("Create the token (with value %d) and send it to %s:%d",
- token, host, peerport);
-
- TRY {
- gras_msg_send(globals->tosuccessor, "stoken", &token);
- }
- CATCH_ANONYMOUS {
- RETHROWF("Unable to send the freshly created token: %s");
- }
- }
-
- /* 8. Wait up to 10 seconds for an incomming message to handle */
- while (globals->remaining_loop > (globals->create ? -1 : 0)) {
- gras_msg_handle(-1);
-
- XBT_DEBUG("looping (remaining_loop=%d)", globals->remaining_loop);
- }
-
- gras_os_sleep(1.0); /* FIXME: if the sender quited, receive fail */
-
- /* 9. Free the allocated resources, and shut GRAS down */
- gras_socket_close(globals->sock);
- gras_socket_close(globals->tosuccessor);
- free(globals);
- gras_exit();
-
- return 0;
-} /* end_of_node */
