1 /* Copyright (c) 2015-2022. 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 #ifndef SIMGRID_MC_TRANSITION_HPP
7 #define SIMGRID_MC_TRANSITION_HPP
9 #include "simgrid/forward.h" // aid_t
10 #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 /* Ordering is important here. depends() implementations only consider subsequent types in this ordering */
35 XBT_DECLARE_ENUM_CLASS(Type, RANDOM, /* First because indep with anybody */
36 TESTANY, WAITANY, /* high priority because they can rewrite themselves to *_WAIT */
37 COMM_RECV, COMM_SEND, COMM_TEST, COMM_WAIT, /* Alphabetical ordering of COMM_* */
38 MUTEX_LOCK, MUTEX_TEST, MUTEX_TRYLOCK, MUTEX_UNLOCK, MUTEX_WAIT, /* alphabetical */
39 /* UNKNOWN must be last */ UNKNOWN);
40 Type type_ = Type::UNKNOWN;
44 /* Which transition was executed for this simcall
46 * Some simcalls can lead to different transitions:
48 * * waitany/testany can trigger on different messages;
50 * * random can produce different values.
52 int times_considered_ = 0;
54 Transition() = default;
55 Transition(Type type, aid_t issuer, int times_considered)
56 : type_(type), aid_(issuer), times_considered_(times_considered)
59 virtual ~Transition();
61 /** Returns a textual representation of the transition. Pointer adresses are omitted if verbose=false */
62 virtual std::string to_string(bool verbose = false) const;
63 /** Returns something like >>label = "desc", color = c<< to describe the transition in dot format */
64 virtual std::string dot_string() const;
66 /* Moves the application toward a path that was already explored, but don't change the current transition */
69 virtual bool depends(const Transition* other) const { return true; }
71 /* Returns the total amount of transitions executed so far (for statistics) */
72 static unsigned long get_executed_transitions() { return executed_transitions_; }
73 /* Returns the total amount of transitions replayed so far while backtracing (for statistics) */
74 static unsigned long get_replayed_transitions() { return replayed_transitions_; }
77 /** Make a new transition from serialized description */
78 Transition* deserialize_transition(aid_t issuer, int times_considered, std::stringstream& stream);
81 } // namespace simgrid