1 /* Copyright (c) 2007-2023. 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 #ifndef SIMGRID_MC_WAITSTRATEGY_HPP
7 #define SIMGRID_MC_WAITSTRATEGY_HPP
9 #include "src/mc/transition/Transition.hpp"
11 namespace simgrid::mc {
13 /** Wait MC guiding class that aims at minimizing the number of in-fly communication.
14 * When possible, it will try to take the wait transition. */
15 class WaitStrategy : public Strategy {
17 bool taking_wait_ = false;
20 WaitStrategy() = default;
21 ~WaitStrategy() override = default;
22 WaitStrategy(const BasicStrategy&) = delete;
23 WaitStrategy& operator=(const WaitStrategy& guide)
25 taken_wait_ = guide.taken_wait_;
29 bool is_transition_wait(Transition::Type type) const
31 return type == Transition::Type::WAITANY or type == Transition::Type::BARRIER_WAIT or
32 type == Transition::Type::MUTEX_WAIT or type == Transition::Type::SEM_WAIT;
35 std::pair<aid_t, int> next_transition() const override
37 std::pair<aid_t, int> if_no_wait = std::make_pair(-1, 0);
38 for (auto const& [aid, actor] : actors_to_run_) {
39 if (not actor.is_todo() || not actor.is_enabled() || actor.is_done())
41 if (is_transition_wait(actor.get_transition(actor.get_times_considered())->type_))
42 return std::make_pair(aid, -(taken_wait_ + 1));
43 if_no_wait = std::make_pair(aid, -taken_wait_);
48 /** If we are taking a wait transition, and last transition wasn't a wait, we need to increment the number
49 * of wait taken. On the opposite, if we took a wait before, and now we are taking another transition, we need
50 * to decrease the count. */
51 void execute_next(aid_t aid, RemoteApp& app) override
53 auto const& actor = actors_to_run_.at(aid);
54 if ((not taking_wait_) and is_transition_wait(actor.get_transition(actor.get_times_considered())->type_)) {
59 if (taking_wait_ and (not is_transition_wait(actor.get_transition(actor.get_times_considered())->type_))) {
66 void consider_best() override
68 aid_t aid = next_transition().first;
69 if (auto actor = actors_to_run_.find(aid); actor != actors_to_run_.end()) {
70 actor->second.mark_todo();
73 for (auto& [_, actor] : actors_to_run_) {
76 if (actor.is_enabled() and not actor.is_done()) {
84 } // namespace simgrid::mc