1 /* Copyright (c) 2008-2023. 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 #include "src/mc/explo/udpor/UnfoldingEvent.hpp"
7 #include "src/mc/explo/udpor/History.hpp"
9 namespace simgrid::mc::udpor {
11 UnfoldingEvent::UnfoldingEvent(std::initializer_list<const UnfoldingEvent*> init_list)
12 : UnfoldingEvent(EventSet(std::move(init_list)))
16 UnfoldingEvent::UnfoldingEvent(EventSet immediate_causes, std::shared_ptr<Transition> transition)
17 : associated_transition(std::move(transition)), immediate_causes(std::move(immediate_causes))
21 bool UnfoldingEvent::operator==(const UnfoldingEvent& other) const
23 // Two events are equivalent iff:
24 // 1. they have the same action
25 // 2. they have the same history
27 // NOTE: All unfolding event objects are created in reference to
28 // an `Unfolding` object which owns them. Hence, the references
29 // they contain to other events in the unfolding can
30 // be used as intrinsic identities (i.e. we don't need to
31 // recursively check if each of our causes has a `==` in
32 // the other event's causes)
33 return associated_transition->aid_ == other.associated_transition->aid_ &&
34 associated_transition->type_ == other.associated_transition->type_ &&
35 associated_transition->times_considered_ == other.associated_transition->times_considered_ &&
36 this->immediate_causes == other.immediate_causes;
39 EventSet UnfoldingEvent::get_history() const
41 return History(this).get_all_events();
44 bool UnfoldingEvent::related_to(const UnfoldingEvent* other) const
46 return this->in_history_of(other) or other->in_history_of(this);
49 bool UnfoldingEvent::in_history_of(const UnfoldingEvent* other) const
51 return History(other).contains(this);
54 bool UnfoldingEvent::conflicts_with(const UnfoldingEvent* other) const
56 // Events that have a causal relation never are in conflict
57 // in an unfolding structure. Two events in conflict must
58 // not be contained in each other's histories
59 if (related_to(other)) {
63 const EventSet my_history = get_history();
64 const EventSet other_history = other->get_history();
65 const EventSet unique_to_me = my_history.subtracting(other_history);
66 const EventSet unique_to_other = other_history.subtracting(my_history);
68 const bool conflicts_with_me = std::any_of(unique_to_me.begin(), unique_to_me.end(),
69 [&](const UnfoldingEvent* e) { return e->is_dependent_with(other); });
70 const bool conflicts_with_other = std::any_of(unique_to_other.begin(), unique_to_other.end(),
71 [&](const UnfoldingEvent* e) { return e->is_dependent_with(this); });
72 return conflicts_with_me or conflicts_with_other;
75 bool UnfoldingEvent::conflicts_with(const Configuration& config) const
77 // A configuration is itself already conflict-free. Thus, it is
78 // simply a matter of testing whether or not the transition associated
79 // with the event is dependent with any already in `config` that are
80 // OUTSIDE this event's history (in an unfolding, events only conflict
81 // if they are not related)
82 const EventSet potential_conflicts = config.get_events().subtracting(get_history());
83 return std::any_of(potential_conflicts.cbegin(), potential_conflicts.cend(),
84 [&](const UnfoldingEvent* e) { return this->is_dependent_with(e); });
87 bool UnfoldingEvent::immediately_conflicts_with(const UnfoldingEvent* other) const
89 // They have to be in conflict at a minimum
90 if (not conflicts_with(other)) {
94 auto combined_events = History(EventSet{this, other}).get_all_events();
96 // See the definition of immediate conflicts in the original paper on UDPOR
98 combined_events.remove(this);
99 if (not combined_events.is_valid_configuration()) {
102 combined_events.insert(this);
106 combined_events.remove(other);
107 if (not combined_events.is_valid_configuration()) {
110 combined_events.insert(other);
116 bool UnfoldingEvent::is_dependent_with(const Transition* t) const
118 return associated_transition->depends(t);
121 bool UnfoldingEvent::is_dependent_with(const UnfoldingEvent* other) const
123 return is_dependent_with(other->associated_transition.get());
126 } // namespace simgrid::mc::udpor