-/* Copyright (c) 2006-2018. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2006-2019. 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 implements a simple producer/consumer schema,
+// passing a bunch of items from one to the other
+
#include "simgrid/s4u.hpp"
#include <memory>
XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_test, "a sample log category");
-// This example implements a one-time use barrier with 1 semaphore and 1 mutex.
-
-static void worker(simgrid::s4u::SemaphorePtr semaphore, simgrid::s4u::MutexPtr mutex, int process_count, std::shared_ptr<int> count)
-{
- mutex->lock();
- XBT_INFO("Got mutex. Incrementing count.");
- XBT_INFO("Count is %d", *count);
- *count = (*count) + 1;
- XBT_INFO("Count is now %d. Process count is %d.", *count, process_count);
+const char* buffer; /* Where the data is exchanged */
+simgrid::s4u::SemaphorePtr sem_empty = simgrid::s4u::Semaphore::create(1); /* indicates whether the buffer is empty */
+simgrid::s4u::SemaphorePtr sem_full = simgrid::s4u::Semaphore::create(0); /* indicates whether the buffer is full */
- if (*count == process_count) {
- XBT_INFO("Releasing the semaphore %d times.", process_count-1);
- for (int i = 0; i < process_count-1; i++) {
- semaphore->release();
- }
- XBT_INFO("Releasing mutex.");
- mutex->unlock();
- }
- else {
- XBT_INFO("Releasing mutex.");
- mutex->unlock();
- XBT_INFO("Acquiring semaphore.");
- semaphore->acquire();
+static void producer(std::vector<std::string>* args)
+{
+ for (auto str : *args) {
+ sem_empty->acquire();
+ XBT_INFO("Pushing '%s'", str.c_str());
+ buffer = str.c_str();
+ sem_full->release();
}
XBT_INFO("Bye!");
}
-
-static void master(unsigned int process_count)
+static void consumer()
{
- simgrid::s4u::SemaphorePtr semaphore = simgrid::s4u::Semaphore::create(0);
- simgrid::s4u::MutexPtr mutex = simgrid::s4u::Mutex::create();
- std::shared_ptr<int> count(new int);
- *count = 0;
+ std::string str;
+ do {
+ sem_full->acquire();
+ str = buffer;
+ XBT_INFO("Receiving '%s'", str.c_str());
+ sem_empty->release();
+ } while (str != "");
- XBT_INFO("Spawning %d workers", process_count);
- for (unsigned int i = 0; i < process_count; i++) {
- simgrid::s4u::Actor::create("worker", simgrid::s4u::Host::by_name("Jupiter"), worker, semaphore, mutex, process_count, count);
- }
+ XBT_INFO("Bye!");
}
int main(int argc, char **argv)
{
- // Parameter: Number of processes in the barrier
- xbt_assert(argc >= 2, "Usage: %s <process-count>\n", argv[0]);
- unsigned int process_count = std::stoi(argv[1]);
- xbt_assert(process_count > 0, "<process-count> must be greater than 0");
-
+ std::vector<std::string> args = std::vector<std::string>({"one", "two", "three", ""});
simgrid::s4u::Engine e(&argc, argv);
e.load_platform("../../platforms/two_hosts.xml");
- simgrid::s4u::Actor::create("master", simgrid::s4u::Host::by_name("Tremblay"), master, process_count);
+ simgrid::s4u::Actor::create("producer", simgrid::s4u::Host::by_name("Tremblay"), producer, &args);
+ simgrid::s4u::Actor::create("consumer", simgrid::s4u::Host::by_name("Jupiter"), consumer);
e.run();
return 0;
