+++ /dev/null
-/* Copyright (c) 2012-2021. 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. */
-
-/***************** Centralized Mutual Exclusion Algorithm *******************/
-/* This example implements a centralized mutual exclusion algorithm. */
-/* Bug : CS requests of client 1 not satisfied */
-/* LTL property checked : G(r->F(cs)); (r=request of CS, cs=CS ok) */
-/****************************************************************************/
-
-#ifdef GARBAGE_STACK
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#endif
-
-#include <simgrid/modelchecker.h>
-#include <simgrid/s4u.hpp>
-#include <xbt/dynar.h>
-
-XBT_LOG_NEW_DEFAULT_CATEGORY(bugged1_liveness, "my log messages");
-
-class Message {
-public:
- enum class Kind { GRANT, REQUEST, RELEASE };
- Kind kind = Kind::GRANT;
- simgrid::s4u::Mailbox* return_mailbox = nullptr;
- explicit Message(Message::Kind kind, simgrid::s4u::Mailbox* mbox) : kind(kind), return_mailbox(mbox) {}
-};
-
-int r = 0;
-int cs = 0;
-
-#ifdef GARBAGE_STACK
-/** Do not use a clean stack */
-static void garbage_stack(void)
-{
- const size_t size = 256;
- int fd = open("/dev/urandom", O_RDONLY);
- char foo[size];
- read(fd, foo, size);
- close(fd);
-}
-#endif
-
-static void coordinator()
-{
- int CS_used = 0;
- std::queue<simgrid::s4u::Mailbox*> requests;
-
- simgrid::s4u::Mailbox* mbox = simgrid::s4u::Mailbox::by_name("coordinator");
-
- while (true) {
- auto m = mbox->get_unique<Message>();
- if (m->kind == Message::Kind::REQUEST) {
- if (CS_used) {
- XBT_INFO("CS already used. Queue the request.");
- requests.push(m->return_mailbox);
- } else {
- if (m->return_mailbox->get_name() != "1") {
- XBT_INFO("CS idle. Grant immediately");
- m->return_mailbox->put(new Message(Message::Kind::GRANT, mbox), 1000);
- CS_used = 1;
- }
- }
- } else {
- if (not requests.empty()) {
- XBT_INFO("CS release. Grant to queued requests (queue size: %zu)", requests.size());
- simgrid::s4u::Mailbox* req = requests.front();
- requests.pop();
- if (req->get_name() != "1") {
- req->put(new Message(Message::Kind::GRANT, mbox), 1000);
- } else {
- requests.push(req);
- CS_used = 0;
- }
- } else {
- XBT_INFO("CS release. resource now idle");
- CS_used = 0;
- }
- }
- }
-}
-
-static void client(int id)
-{
- aid_t my_pid = simgrid::s4u::this_actor::get_pid();
-
- simgrid::s4u::Mailbox* my_mailbox = simgrid::s4u::Mailbox::by_name(std::to_string(id));
-
- while (true) {
- XBT_INFO("Ask the request");
- simgrid::s4u::Mailbox::by_name("coordinator")->put(new Message(Message::Kind::REQUEST, my_mailbox), 1000);
-
- if (id == 1) {
- r = 1;
- cs = 0;
- XBT_INFO("Propositions changed : r=1, cs=0");
- }
-
- auto grant = my_mailbox->get_unique<Message>();
-
- if ((id == 1) && (grant->kind == Message::Kind::GRANT)) {
- cs = 1;
- r = 0;
- XBT_INFO("Propositions changed : r=0, cs=1");
- }
-
- XBT_INFO("%d got the answer. Sleep a bit and release it", id);
-
- simgrid::s4u::this_actor::sleep_for(1);
-
- simgrid::s4u::Mailbox::by_name("coordinator")->put(new Message(Message::Kind::RELEASE, my_mailbox), 1000);
-
- simgrid::s4u::this_actor::sleep_for(static_cast<double>(my_pid));
-
- if (id == 1) {
- cs = 0;
- r = 0;
- XBT_INFO("Propositions changed : r=0, cs=0");
- }
- }
-}
-
-static void raw_client(int id)
-{
-#ifdef GARBAGE_STACK
- // At this point the stack of the callee (client) is probably filled with
- // zeros and uninitialized variables will contain 0. This call will place
- // random byes in the stack of the callee:
- garbage_stack();
-#endif
- client(id);
-}
-
-int main(int argc, char* argv[])
-{
- simgrid::s4u::Engine e(&argc, argv);
-
- MC_automaton_new_propositional_symbol_pointer("r", &r);
- MC_automaton_new_propositional_symbol_pointer("cs", &cs);
-
- e.load_platform(argv[1]);
-
- simgrid::s4u::Actor::create("coordinator", simgrid::s4u::Host::by_name("Tremblay"), coordinator)
- ->set_kill_time(argc > 3 ? std::stod(argv[3]) : -1.0);
- if (std::stod(argv[2]) == 0) {
- simgrid::s4u::Actor::create("client", simgrid::s4u::Host::by_name("Boivin"), raw_client, 1);
- simgrid::s4u::Actor::create("client", simgrid::s4u::Host::by_name("Fafard"), raw_client, 2);
- } else { // "Visited" case
- simgrid::s4u::Actor::create("client", simgrid::s4u::Host::by_name("Boivin"), raw_client, 2);
- simgrid::s4u::Actor::create("client", simgrid::s4u::Host::by_name("Fafard"), raw_client, 1);
- }
- e.run();
-
- return 0;
-}
