1 /* Copyright (c) 2010-2017. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 /* This example shows how to use asynchronous communications.
8 * The sender initiate all the messages it wants to send, and then block for their completion.
9 * All messages thus occurs concurrently.
11 * On the receiver side, the reception is synchronous.
13 * TODO: this example is supposed to test the waitall function, but this is not ported to s4u yet.
17 #include "simgrid/s4u.hpp"
22 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_async_waitall, "Messages specific for this msg example");
27 double msg_size; /* in bytes */
30 explicit sender(std::vector<std::string> args)
32 xbt_assert(args.size() == 4, "This function expects 4 parameters from the XML deployment file but got %zu",
34 messages_count = std::stol(args[1]);
35 msg_size = std::stod(args[2]);
36 receivers_count = std::stol(args[3]);
41 std::vector<simgrid::s4u::CommPtr>* pending_comms = new std::vector<simgrid::s4u::CommPtr>();
43 /* Start dispatching all messages to receivers, in a round robin fashion */
44 for (int i = 0; i < messages_count; i++) {
46 std::string mboxName = std::string("receiver-") + std::to_string(i % receivers_count);
47 simgrid::s4u::MailboxPtr mbox = simgrid::s4u::Mailbox::byName(mboxName);
48 std::string msgName = std::string("Message ") + std::to_string(i);
49 char* payload = xbt_strdup(msgName.c_str()); // copy the data we send: 'msgName' is not a stable storage location
51 XBT_INFO("Send '%s' to '%s'", msgName.c_str(), mboxName.c_str());
52 /* Create a communication representing the ongoing communication */
53 simgrid::s4u::CommPtr comm = mbox->put_async((void*)payload, msg_size);
54 /* Add this comm to the vector of all known comms */
55 pending_comms->push_back(comm);
57 /* Start sending messages to let the workers know that they should stop */
58 for (int i = 0; i < receivers_count; i++) {
59 std::string mbox_name = std::string("receiver-") + std::to_string(i % receivers_count);
60 simgrid::s4u::MailboxPtr mbox = simgrid::s4u::Mailbox::byName(mbox_name);
61 char* payload = xbt_strdup("finalize"); // Make a copy of the data we will send
63 simgrid::s4u::CommPtr comm = mbox->put_async((void*)payload, 0);
64 pending_comms->push_back(comm);
65 XBT_INFO("Send 'finalize' to 'receiver-%ld'", i % receivers_count);
67 XBT_INFO("Done dispatching all messages");
69 /* Now that all message exchanges were initiated, this loop waits for the termination of them all */
70 for (int i = 0; i < messages_count + receivers_count; i++)
71 pending_comms->at(i)->wait();
73 XBT_INFO("Goodbye now!");
79 simgrid::s4u::MailboxPtr mbox;
82 explicit receiver(std::vector<std::string> args)
84 xbt_assert(args.size() == 2, "This function expects 2 parameters from the XML deployment file but got %zu",
86 int id = xbt_str_parse_int(args[1].c_str(), "Any process of this example must have a numerical name, not %s");
87 std::string mbox_name = std::string("receiver-") + std::to_string(id);
88 mbox = simgrid::s4u::Mailbox::byName(mbox_name);
92 XBT_INFO("Wait for my first message");
94 char* received = static_cast<char*>(mbox->get());
95 XBT_INFO("I got a '%s'.", received);
96 if (std::strcmp(received, "finalize") == 0) { /* If it's a finalize message, we're done */
100 /* Otherwise receiving the message was all we were supposed to do */
106 int main(int argc, char *argv[])
108 simgrid::s4u::Engine* e = new simgrid::s4u::Engine(&argc, argv);
110 xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n", argv[0]);
112 e->registerFunction<sender>("sender");
113 e->registerFunction<receiver>("receiver");
115 e->loadPlatform(argv[1]);
116 e->loadDeployment(argv[2]);