1 /* Copyright (c) 2008-2022. 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 #include "src/mc/mc_base.hpp"
8 #include "src/kernel/EngineImpl.hpp"
9 #include "src/kernel/activity/CommImpl.hpp"
10 #include "src/kernel/activity/MutexImpl.hpp"
11 #include "src/kernel/actor/SimcallObserver.hpp"
12 #include "src/mc/mc_config.hpp"
13 #include "src/mc/mc_replay.hpp"
15 #include "xbt/random.hpp"
18 #include "src/mc/ModelChecker.hpp"
19 #include "src/mc/Session.hpp"
20 #include "src/mc/remote/RemoteProcess.hpp"
23 XBT_LOG_NEW_DEFAULT_CATEGORY(mc, "All MC categories");
25 int MC_random(int min, int max)
28 xbt_assert(mc_model_checker == nullptr);
30 if (not MC_is_active() && not MC_record_replay_is_active()) { // no need to do a simcall in this case
31 static simgrid::xbt::random::XbtRandom prng;
32 return prng.uniform_int(min, max);
34 simgrid::kernel::actor::RandomSimcall observer{simgrid::kernel::actor::ActorImpl::self(), min, max};
35 return simgrid::kernel::actor::simcall_answered([&observer] { return observer.get_value(); }, &observer);
38 namespace simgrid::mc {
42 auto* engine = kernel::EngineImpl::get_instance();
44 xbt_assert(mc_model_checker == nullptr, "This must be called from the client");
46 while (engine->has_actors_to_run()) {
47 engine->run_all_actors();
48 for (auto const& actor : engine->get_actors_that_ran()) {
49 const kernel::actor::Simcall* req = &actor->simcall_;
50 if (req->call_ != kernel::actor::Simcall::Type::NONE && not simgrid::mc::request_is_visible(req))
51 actor->simcall_handle(0);
55 engine->reset_actor_dynar();
56 for (auto const& [_, actor] : engine->get_actor_list()) {
57 // Only visible requests remain at this point, and they all have an observer
58 actor->simcall_.mc_max_consider_ = actor->simcall_.observer_->get_max_consider();
60 engine->add_actor_to_dynar(actor);
65 /** @brief returns if there this transition can proceed in a finite amount of time
67 * It is used in the model-checker to not get into self-deadlock where it would execute a never ending transition.
69 * Only WAIT operations (on comm, on mutex, etc) can ever return false because they could lock the MC exploration.
70 * Wait operations are OK and return true in only two situations:
71 * - if the wait will succeed immediately (if both peer of the comm are there already or if the mutex is available)
72 * - if a timeout is provided, because we can fire the timeout if the transition is not ready without blocking in this
73 * transition for ever.
74 * This is controlled in the is_enabled() method of the corresponding observers.
76 // Called from both MCer and MCed:
77 bool actor_is_enabled(kernel::actor::ActorImpl* actor)
80 xbt_assert(mc_model_checker == nullptr, "This should be called from the client side");
83 // Now, we are in the client app, no need for remote memory reading.
84 kernel::actor::Simcall* req = &actor->simcall_;
86 if (req->observer_ != nullptr)
87 return req->observer_->is_enabled();
89 if (req->call_ == kernel::actor::Simcall::Type::NONE)
92 /* The rest of the requests are always enabled */
96 /* This is the list of requests that are visible from the checker algorithm.
97 * Any other requests are handled right away on the application side.
99 bool request_is_visible(const kernel::actor::Simcall* req)
102 xbt_assert(mc_model_checker == nullptr, "This should be called from the client side");
104 if (req->observer_ != nullptr)
105 return req->observer_->is_visible();
110 } // namespace simgrid::mc