/* 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 "xbt/str.h"
+#include <cstdlib>
+#include <iostream>
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;
-
+class Sender {
+ long messages_count; /* - number of tasks */
+ long receivers_count; /* - number of receivers */
+ double msg_size; /* - communication cost in bytes */
+
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()()
-{
- /* 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);
- }
- /* 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);
+ explicit Sender(std::vector<std::string> args)
+ {
+ xbt_assert(args.size() == 4, "Expecting 3 parameters from the XML deployment file but got %zu", args.size());
+ messages_count = std::stol(args[1]);
+ msg_size = std::stod(args[2]);
+ receivers_count = std::stol(args[3]);
}
+ void operator()()
+ {
+ std::vector<simgrid::s4u::CommPtr> pending_comms;
- XBT_INFO("Goodbye now!");
+ /* Start dispatching all messages to receivers, in a round robin fashion */
+ for (int i = 0; i < messages_count; i++) {
-}
+ std::string mboxName = std::string("receiver-") + std::to_string(i % receivers_count);
+ simgrid::s4u::MailboxPtr mbox = simgrid::s4u::Mailbox::byName(mboxName);
+ std::string msgName = std::string("Message ") + std::to_string(i);
+ char* payload = xbt_strdup(msgName.c_str()); // copy the data we send: 'msgName' is not a stable storage location
+
+ XBT_INFO("Send '%s' to '%s'", msgName.c_str(), mboxName.c_str());
+ /* Create a communication representing the ongoing communication */
+ simgrid::s4u::CommPtr comm = mbox->put_async((void*)payload, msg_size);
+ /* Add this comm to the vector of all known comms */
+ 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++) {
+ std::string mboxName = std::string("receiver-") + std::to_string(i % receivers_count);
+ simgrid::s4u::MailboxPtr mbox = simgrid::s4u::Mailbox::byName(mboxName);
+ char* payload = xbt_strdup("finalize"); // Make a copy of the data we will send
+
+ simgrid::s4u::CommPtr comm = mbox->put_async((void*)payload, 0);
+ pending_comms.push_back(comm);
+ XBT_INFO("Send 'finalize' to 'receiver-%ld'", i % receivers_count);
+ }
+ XBT_INFO("Done dispatching all messages");
+
+ /* 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(); // we could provide a timeout as a parameter
+ pending_comms.pop_back(); // remove it from the list
+ }
+
+ XBT_INFO("Goodbye now!");
+ }
};
-/* Receiver process expects 3 arguments: */
-class receiver {
- int id; /* - unique id */
- double sleep_start_time; /* - start time */
- double sleep_test_time; /* - test time */
+/* Receiver actor expects 1 argument: its ID */
+class Receiver {
simgrid::s4u::MailboxPtr mbox;
-
+
public:
- explicit receiver(std::vector<std::string> args)
+ 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_assert(args.size() == 2, "Expecting one parameter from the XML deployment file but got %zu", args.size());
+ std::string mboxName = std::string("receiver-") + args[1];
+ mbox = simgrid::s4u::Mailbox::byName(mboxName);
+ }
-void operator()()
-{
- 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 */
+ void operator()()
+ {
+ XBT_INFO("Wait for my first message");
+ while (1) {
+ char* received = static_cast<char*>(mbox->get());
+ 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;
+ }
+ /* Otherwise receiving the message was all we were supposed to do */
xbt_free(received);
- break;
}
}
-}
};
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.registerFunction<Sender>("sender");
+ e.registerFunction<Receiver>("receiver");
+
+ e.loadPlatform(argv[1]);
+ e.loadDeployment(argv[2]);
+ e.run();
+
+ return 0;
}
