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 #include "src/mc/transition/TransitionSynchro.hpp"
7 #include "xbt/asserts.h"
9 #include "xbt/string.hpp"
14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_trans_synchro, mc_transition, "Logging specific to MC synchronization transitions");
18 std::string MutexTransition::to_string(bool verbose) const
20 return xbt::string_printf("%s(mutex: %" PRIxPTR ", owner:%ld)", Transition::to_c_str(type_), mutex_, owner_);
23 MutexTransition::MutexTransition(aid_t issuer, int times_considered, Type type, std::stringstream& stream)
24 : Transition(type, issuer, times_considered)
26 xbt_assert(stream >> mutex_ >> owner_);
29 bool MutexTransition::depends(const Transition* o) const
32 return o->depends(this);
34 // type_ <= other->type_ in MUTEX_LOCK, MUTEX_TEST, MUTEX_TRYLOCK, MUTEX_UNLOCK, MUTEX_WAIT,
36 if (auto* other = dynamic_cast<const MutexTransition*>(o)) {
37 // Theorem 4.4.7: Any pair of synchronization actions of distinct actors concerning distinct mutexes are independent
38 if (mutex_ != other->mutex_)
41 // Theorem 4.4.11: LOCK indep TEST/WAIT.
42 // If both enabled, the result does not depend on their order. If WAIT is not enabled, LOCK won't enable it.
43 if (type_ == Type::MUTEX_LOCK && (other->type_ == Type::MUTEX_TEST || other->type_ == Type::MUTEX_WAIT))
46 // Theorem 4.4.8: LOCK indep UNLOCK.
47 // pop_front and push_back are independent.
48 if (type_ == Type::MUTEX_LOCK && other->type_ == Type::MUTEX_UNLOCK)
51 // TEST is a pure function; TEST/WAIT won't change the owner; TRYLOCK will always fail if TEST is enabled (because a
53 if (type_ == Type::MUTEX_TEST &&
54 (other->type_ == Type::MUTEX_TEST || other->type_ == Type::MUTEX_TRYLOCK || other->type_ == Type::MUTEX_WAIT))
57 // TRYLOCK will always fail if TEST is enabled (because a request is queued), and may not overpass the WAITed
58 // request in the queue
59 if (type_ == Type::MUTEX_TRYLOCK && other->type_ == Type::MUTEX_WAIT)
62 // FIXME: UNLOCK indep WAIT/TEST iff wait/test are not first in the waiting queue
66 return false; // mutexes are INDEP with non-mutex transitions
69 std::string SemaphoreTransition::to_string(bool verbose) const
71 if (type_ == Type::SEM_LOCK || type_ == Type::SEM_UNLOCK)
72 return xbt::string_printf("%s(semaphore: %" PRIxPTR ")", Transition::to_c_str(type_), sem_);
73 if (type_ == Type::SEM_WAIT)
74 return xbt::string_printf("%s(semaphore: %" PRIxPTR ", granted: %s)", Transition::to_c_str(type_), sem_,
75 granted_ ? "yes" : "no");
78 SemaphoreTransition::SemaphoreTransition(aid_t issuer, int times_considered, Type type, std::stringstream& stream)
79 : Transition(type, issuer, times_considered)
81 xbt_assert(stream >> sem_ >> granted_);
83 bool SemaphoreTransition::depends(const Transition* o) const
86 return o->depends(this);
88 if (auto* other = dynamic_cast<const SemaphoreTransition*>(o)) {
89 if (sem_ != other->sem_)
92 // LOCK indep UNLOCK: pop_front and push_back are independent.
93 if (type_ == Type::SEM_LOCK && other->type_ == Type::SEM_UNLOCK)
96 // LOCK indep WAIT: If both enabled, ordering has no impact on the result. If WAIT is not enabled, LOCK won't enable
98 if (type_ == Type::SEM_LOCK && other->type_ == Type::SEM_WAIT)
101 // UNLOCK indep UNLOCK: ordering of two pop_front has no impact
102 if (type_ == Type::SEM_UNLOCK && other->type_ == Type::SEM_UNLOCK)
106 // if both enabled (may happen in the initial value is sufficient), the ordering has no impact on the result.
107 // If only one enabled, the other won't be enabled by the first one.
108 // If none enabled, well, nothing will change.
109 if (type_ == Type::SEM_WAIT && other->type_ == Type::SEM_WAIT)
112 return true; // Other semaphore cases are dependent
115 return false; // semaphores are INDEP with non-semaphore transitions
119 } // namespace simgrid