1 /* Copyright (c) 2015-2022. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #ifndef SIMGRID_MC_TRANSITION_HPP
8 #define SIMGRID_MC_TRANSITION_HPP
10 #include "simgrid/forward.h" // aid_t
11 #include "xbt/utility.hpp" // XBT_DECLARE_ENUM_CLASS
18 /** An element in the recorded path
20 * At each decision point, we need to record which process transition
21 * is triggered and potentially which value is associated with this
22 * transition. The value is used to find which communication is triggered
23 * in things like waitany and for associating a given value of MC_random()
27 /* Textual representation of the transition, to display backtraces */
28 static unsigned long executed_transitions_;
29 static unsigned long replayed_transitions_;
31 friend State; // FIXME remove this once we have a proper class to handle the statistics
34 XBT_DECLARE_ENUM_CLASS(Type, UNKNOWN, RANDOM, ISEND, IRECV, COMM_WAIT, COMM_TEST);
35 Type type_ = Type::UNKNOWN;
39 /* Which transition was executed for this simcall
41 * Some simcalls can lead to different transitions:
43 * * waitany/testany can trigger on different messages;
45 * * random can produce different values.
47 int times_considered_ = 0;
49 Transition() = default;
50 Transition(Type type, aid_t issuer, int times_considered)
51 : type_(type), aid_(issuer), times_considered_(times_considered)
54 virtual ~Transition();
56 virtual std::string to_string(bool verbose = false) const;
57 virtual std::string dot_label() const;
59 /* Moves the application toward a path that was already explored, but don't change the current transition */
62 virtual bool depends(const Transition* other) const { return true; }
64 /* Returns the total amount of transitions executed so far (for statistics) */
65 static unsigned long get_executed_transitions() { return executed_transitions_; }
66 /* Returns the total amount of transitions replayed so far while backtracing (for statistics) */
67 static unsigned long get_replayed_transitions() { return replayed_transitions_; }
70 class RandomTransition : public Transition {
75 std::string to_string(bool verbose) const override;
76 std::string dot_label() const override;
77 RandomTransition(aid_t issuer, int times_considered, char* buffer);
78 bool depends(const Transition* other) const override { return false; } // Independent with any other transition
82 } // namespace simgrid