1 /* Copyright (c) 2015-2023. 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/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");
16 namespace simgrid::mc {
18 std::string BarrierTransition::to_string(bool verbose) const
20 return xbt::string_printf("%s(barrier: %u)", Transition::to_c_str(type_), bar_);
22 BarrierTransition::BarrierTransition(aid_t issuer, int times_considered, Type type, std::stringstream& stream)
23 : Transition(type, issuer, times_considered)
25 xbt_assert(stream >> bar_);
27 bool BarrierTransition::depends(const Transition* o) const
30 return o->depends(this);
32 if (const auto* other = dynamic_cast<const BarrierTransition*>(o)) {
33 if (bar_ != other->bar_)
36 // LOCK indep LOCK: requests are not ordered in a barrier
37 if (type_ == Type::BARRIER_ASYNC_LOCK && other->type_ == Type::BARRIER_ASYNC_LOCK)
40 // WAIT indep WAIT: requests are not ordered
41 if (type_ == Type::BARRIER_WAIT && other->type_ == Type::BARRIER_WAIT)
44 return true; // LOCK/WAIT is dependent because lock may enable wait
47 return false; // barriers are INDEP with non-barrier transitions
50 std::string MutexTransition::to_string(bool verbose) const
52 return xbt::string_printf("%s(mutex: %" PRIxPTR ", owner: %ld)", Transition::to_c_str(type_), mutex_, owner_);
55 MutexTransition::MutexTransition(aid_t issuer, int times_considered, Type type, std::stringstream& stream)
56 : Transition(type, issuer, times_considered)
58 xbt_assert(stream >> mutex_ >> owner_);
61 bool MutexTransition::depends(const Transition* o) const
64 return o->depends(this);
66 // Actions executed by the same actor are always dependent
70 // type_ <= other->type_ in MUTEX_LOCK, MUTEX_TEST, MUTEX_TRYLOCK, MUTEX_UNLOCK, MUTEX_WAIT,
72 if (const auto* other = dynamic_cast<const MutexTransition*>(o)) {
73 // Theorem 4.4.7: Any pair of synchronization actions of distinct actors concerning distinct mutexes are independent
74 if (mutex_ != other->mutex_)
77 // Theorem 4.4.11: LOCK indep TEST/WAIT.
78 // If both enabled, the result does not depend on their order. If WAIT is not enabled, LOCK won't enable it.
79 if (type_ == Type::MUTEX_ASYNC_LOCK && (other->type_ == Type::MUTEX_TEST || other->type_ == Type::MUTEX_WAIT))
82 // Theorem 4.4.8: LOCK indep UNLOCK.
83 // pop_front and push_back are independent.
84 if (type_ == Type::MUTEX_ASYNC_LOCK && other->type_ == Type::MUTEX_UNLOCK)
87 // TEST is a pure function; TEST/WAIT won't change the owner; TRYLOCK will always fail if TEST is enabled (because a
89 if (type_ == Type::MUTEX_TEST &&
90 (other->type_ == Type::MUTEX_TEST || other->type_ == Type::MUTEX_TRYLOCK || other->type_ == Type::MUTEX_WAIT))
93 // TRYLOCK will always fail if TEST is enabled (because a request is queued), and may not overpass the WAITed
94 // request in the queue
95 if (type_ == Type::MUTEX_TRYLOCK && other->type_ == Type::MUTEX_WAIT)
98 // FIXME: UNLOCK indep WAIT/TEST iff wait/test are not first in the waiting queue
102 return false; // mutexes are INDEP with non-mutex transitions
105 std::string SemaphoreTransition::to_string(bool verbose) const
107 if (type_ == Type::SEM_ASYNC_LOCK || type_ == Type::SEM_UNLOCK)
108 return xbt::string_printf("%s(semaphore: %" PRIxPTR ")", Transition::to_c_str(type_), sem_);
109 if (type_ == Type::SEM_WAIT)
110 return xbt::string_printf("%s(semaphore: %" PRIxPTR ", granted: %s)", Transition::to_c_str(type_), sem_,
111 granted_ ? "yes" : "no");
114 SemaphoreTransition::SemaphoreTransition(aid_t issuer, int times_considered, Type type, std::stringstream& stream)
115 : Transition(type, issuer, times_considered)
117 xbt_assert(stream >> sem_ >> granted_);
119 bool SemaphoreTransition::depends(const Transition* o) const
121 if (o->type_ < type_)
122 return o->depends(this);
124 if (const auto* other = dynamic_cast<const SemaphoreTransition*>(o)) {
125 if (sem_ != other->sem_)
128 // LOCK indep UNLOCK: pop_front and push_back are independent.
129 if (type_ == Type::SEM_ASYNC_LOCK && other->type_ == Type::SEM_UNLOCK)
132 // LOCK indep WAIT: If both enabled, ordering has no impact on the result. If WAIT is not enabled, LOCK won't enable
134 if (type_ == Type::SEM_ASYNC_LOCK && other->type_ == Type::SEM_WAIT)
137 // UNLOCK indep UNLOCK: ordering of two pop_front has no impact
138 if (type_ == Type::SEM_UNLOCK && other->type_ == Type::SEM_UNLOCK)
142 // if both enabled (may happen in the initial value is sufficient), the ordering has no impact on the result.
143 // If only one enabled, the other won't be enabled by the first one.
144 // If none enabled, well, nothing will change.
145 if (type_ == Type::SEM_WAIT && other->type_ == Type::SEM_WAIT)
148 return true; // Other semaphore cases are dependent
151 return false; // semaphores are INDEP with non-semaphore transitions
154 } // namespace simgrid::mc