-/* Copyright (c) 2010-2017. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2010-2019. 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. */
-/* This example shows how to block until the completion of a communication.
+/* This example shows how to use simgrid::s4u::this_actor::wait() to wait for a given communication.
+ *
+ * As for the other asynchronous examples, the sender initiate all the messages it wants to send and
+ * pack the resulting simgrid::s4u::CommPtr objects in a vector. All messages thus occurs concurrently.
+ *
+ * The sender then loops until there is no ongoing communication.
*/
- #include "simgrid/s4u.hpp"
- #include "xbt/str.h"
- #include <cstdlib>
- #include <iostream>
+#include "simgrid/s4u.hpp"
+#include <cstdlib>
+#include <iostream>
+#include <string>
XBT_LOG_NEW_DEFAULT_CATEGORY(msg_async_wait, "Messages specific for this s4u example");
-/* Main function of the Sender process */
-class sender {
- long messages_count; /* - number of tasks */
- long receivers_count; /* - number of receivers */
- double sleep_start_time; /* - start time */
- double sleep_test_time; /* - test time */
- double msg_size; /* - computational cost */
- double task_comm_size; /* - communication cost */
- simgrid::s4u::MailboxPtr mbox;
-
-public:
- explicit sender(std::vector<std::string> args)
-{
- xbt_assert(args.size() == 7, "The sender function expects 6 arguments from the XML deployment file");
- messages_count = std::stol(args[1]);
- msg_size = std::stod(args[2]);
- task_comm_size = std::stod(args[3]);
- receivers_count = std::stol(args[4]);
- double sleep_start_time = std::stod(args[5]);
- double sleep_test_time = std::stod(args[6]);
- XBT_INFO("sleep_start_time : %f , sleep_test_time : %f", sleep_start_time, sleep_test_time);
-}
-void operator()()
+static int sender(int argc, char** argv)
{
+ xbt_assert(argc == 4, "Expecting 3 parameters from the XML deployment file but got %d", argc);
+ long messages_count = std::stol(argv[1]); /* - number of tasks */
+ double msg_size = std::stol(argv[2]); /* - communication cost in bytes */
+ long receivers_count = std::stod(argv[3]); /* - number of receivers */
+
+ /* Vector in which we store all ongoing communications */
+ std::vector<simgrid::s4u::CommPtr> pending_comms;
+
+ /* Make a vector of the mailboxes to use */
+ std::vector<simgrid::s4u::Mailbox*> mboxes;
+ for (int i = 0; i < receivers_count; i++)
+ mboxes.push_back(simgrid::s4u::Mailbox::by_name(std::string("receiver-") + std::to_string(i)));
+
/* Start dispatching all messages to receivers, in a round robin fashion */
for (int i = 0; i < messages_count; i++) {
- char mailbox[80];
- char taskname[80];
-
- std::string mbox_name = std::string("receiver-") + std::to_string(i % receivers_count);
- mbox = simgrid::s4u::Mailbox::byName(mbox_name);
- snprintf(mailbox,79, "receiver-%ld", i % receivers_count);
- snprintf(taskname,79, "Task_%d", i);
-
- /* Create a communication representing the ongoing communication */
- simgrid::s4u::CommPtr comm = mbox->put_async((void*)mailbox, msg_size);
- XBT_INFO("Send to receiver-%ld Task_%d", i % receivers_count, i);
- comm->wait(task_comm_size);
+ std::string msg_content = std::string("Message ") + std::to_string(i);
+ // Copy the data we send: 'msg_content' is not a stable storage location.
+ // It will be destroyed when this actor leaves the loop, ie before the receiver gets it
+ std::string* payload = new std::string(msg_content);
+
+ XBT_INFO("Send '%s' to '%s'", msg_content.c_str(), mboxes[i % receivers_count]->get_cname());
+
+ /* Create a communication representing the ongoing communication, and store it in pending_comms */
+ simgrid::s4u::CommPtr comm = mboxes[i % receivers_count]->put_async(payload, msg_size);
+ pending_comms.push_back(comm);
}
+
/* Start sending messages to let the workers know that they should stop */
for (int i = 0; i < receivers_count; i++) {
- char mailbox[80];
- char* payload = xbt_strdup("finalize");
- snprintf(mailbox, 79, "receiver-%d", i);
- simgrid::s4u::CommPtr comm = mbox->put_async((void*)payload, 0);
- comm->wait(task_comm_size);
- XBT_INFO("Send to receiver-%d finalize", i);
+ XBT_INFO("Send 'finalize' to 'receiver-%d'", i);
+ simgrid::s4u::CommPtr comm = mboxes[i]->put_async(new std::string("finalize"), 0);
+ pending_comms.push_back(comm);
}
+ XBT_INFO("Done dispatching all messages");
- XBT_INFO("Goodbye now!");
+ /* Now that all message exchanges were initiated, wait for their completion, in order of creation. */
+ while (not pending_comms.empty()) {
+ simgrid::s4u::CommPtr comm = pending_comms.back();
+ comm->wait();
+ pending_comms.pop_back(); // remove it from the list
+ }
-}
-};
-
-/* Receiver process expects 3 arguments: */
-class receiver {
- int id; /* - unique id */
- double sleep_start_time; /* - start time */
- double sleep_test_time; /* - test time */
- simgrid::s4u::MailboxPtr mbox;
-
-public:
- explicit receiver(std::vector<std::string> args)
- {
- xbt_assert(args.size() == 4, "The relay_runner function does not accept any parameter from the XML deployment file");
- id = std::stoi(args[1]);
- sleep_start_time = std::stod(args[2]);
- sleep_test_time = std::stod(args[3]);
- XBT_INFO("sleep_start_time : %f , sleep_test_time : %f", sleep_start_time, sleep_test_time);
- std::string mbox_name = std::string("receiver-") + std::to_string(id);
- mbox = simgrid::s4u::Mailbox::byName(mbox_name);
+ XBT_INFO("Goodbye now!");
+ return 0;
}
-void operator()()
+/* Receiver actor expects 1 argument: its ID */
+static int receiver(int argc, char** argv)
{
- char mailbox[80];
- snprintf(mailbox,79, "receiver-%d", id);
- while (1) {
- char* received = static_cast<char*>(mbox->get());
- XBT_INFO("Wait to receive a task");
- XBT_INFO("I got a '%s'.", received);
- if (std::strcmp(received, "finalize") == 0) { /* If it's a finalize message, we're done */
- xbt_free(received);
- break;
- }
+ xbt_assert(argc == 2, "Expecting one parameter from the XML deployment file but got %d", argc);
+ simgrid::s4u::Mailbox* mbox = simgrid::s4u::Mailbox::by_name(std::string("receiver-") + argv[1]);
+
+ XBT_INFO("Wait for my first message");
+ for (bool cont = true; cont;) {
+ std::string* received = static_cast<std::string*>(mbox->get());
+ XBT_INFO("I got a '%s'.", received->c_str());
+ if (*received == "finalize")
+ cont = false; // If it's a finalize message, we're done.
+ delete received;
}
+ return 0;
}
-};
int main(int argc, char *argv[])
{
- simgrid::s4u::Engine* e = new simgrid::s4u::Engine(&argc, argv);
-
- xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n", argv[0]);
-
- e->registerFunction<sender>("sender");
- e->registerFunction<receiver>("receiver");
-
- e->loadPlatform(argv[1]);
- e->loadDeployment(argv[2]);
- e->run();
-
- return 0;
+ xbt_assert(argc > 2, "Usage: %s platform_file deployment_file\n", argv[0]);
+
+ simgrid::s4u::Engine e(&argc, argv);
+ e.register_function("sender", &sender);
+ e.register_function("receiver", &receiver);
+
+ e.load_platform(argv[1]);
+ e.load_deployment(argv[2]);
+ e.run();
+
+ return 0;
}