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 block on the completion of a set of communications.
8 * As for the other asynchronous examples, the sender initiate all the messages it wants to send and
9 * pack the resulting simgrid::s4u::CommPtr objects in a vector. All messages thus occurs concurrently.
11 * The sender then blocks until all ongoing communication terminate, using simgrid::s4u::Comm::wait_all()
15 #include "simgrid/s4u.hpp"
20 XBT_LOG_NEW_DEFAULT_CATEGORY(msg_async_waitall, "Messages specific for this s4u example");
25 double msg_size; /* in bytes */
28 explicit sender(std::vector<std::string> args)
30 xbt_assert(args.size() == 4, "This function expects 4 parameters from the XML deployment file but got %zu",
32 messages_count = std::stol(args[1]);
33 msg_size = std::stod(args[2]);
34 receivers_count = std::stol(args[3]);
39 std::vector<simgrid::s4u::CommPtr>* pending_comms = new std::vector<simgrid::s4u::CommPtr>();
41 /* Start dispatching all messages to receivers, in a round robin fashion */
42 for (int i = 0; i < messages_count; i++) {
44 std::string mboxName = std::string("receiver-") + std::to_string(i % receivers_count);
45 simgrid::s4u::MailboxPtr mbox = simgrid::s4u::Mailbox::byName(mboxName);
46 std::string msgName = std::string("Message ") + std::to_string(i);
47 char* payload = xbt_strdup(msgName.c_str()); // copy the data we send: 'msgName' is not a stable storage location
49 XBT_INFO("Send '%s' to '%s'", msgName.c_str(), mboxName.c_str());
50 /* Create a communication representing the ongoing communication */
51 simgrid::s4u::CommPtr comm = mbox->put_async((void*)payload, msg_size);
52 /* Add this comm to the vector of all known comms */
53 pending_comms->push_back(comm);
55 /* Start sending messages to let the workers know that they should stop */
56 for (int i = 0; i < receivers_count; i++) {
57 std::string mbox_name = std::string("receiver-") + std::to_string(i % receivers_count);
58 simgrid::s4u::MailboxPtr mbox = simgrid::s4u::Mailbox::byName(mbox_name);
59 char* payload = xbt_strdup("finalize"); // Make a copy of the data we will send
61 simgrid::s4u::CommPtr comm = mbox->put_async((void*)payload, 0);
62 pending_comms->push_back(comm);
63 XBT_INFO("Send 'finalize' to 'receiver-%ld'", i % receivers_count);
65 XBT_INFO("Done dispatching all messages");
67 /* Now that all message exchanges were initiated, wait for their completion in one single call */
68 simgrid::s4u::Comm::wait_all(pending_comms);
70 XBT_INFO("Goodbye now!");
76 simgrid::s4u::MailboxPtr mbox;
79 explicit receiver(std::vector<std::string> args)
81 xbt_assert(args.size() == 2, "This function expects 2 parameters from the XML deployment file but got %zu",
83 int id = xbt_str_parse_int(args[1].c_str(), "Any process of this example must have a numerical name, not %s");
84 std::string mbox_name = std::string("receiver-") + std::to_string(id);
85 mbox = simgrid::s4u::Mailbox::byName(mbox_name);
89 XBT_INFO("Wait for my first message");
91 char* received = static_cast<char*>(mbox->get());
92 XBT_INFO("I got a '%s'.", received);
93 if (std::strcmp(received, "finalize") == 0) { /* If it's a finalize message, we're done */
97 /* Otherwise receiving the message was all we were supposed to do */
103 int main(int argc, char *argv[])
105 simgrid::s4u::Engine* e = new simgrid::s4u::Engine(&argc, argv);
107 xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n", argv[0]);
109 e->registerFunction<sender>("sender");
110 e->registerFunction<receiver>("receiver");
112 e->loadPlatform(argv[1]);
113 e->loadDeployment(argv[2]);