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");
19 std::string BarrierTransition::to_string(bool verbose) const
21 return xbt::string_printf("%s(barrier: %u)", Transition::to_c_str(type_), bar_);
23 BarrierTransition::BarrierTransition(aid_t issuer, int times_considered, Type type, std::stringstream& stream)
24 : Transition(type, issuer, times_considered)
26 xbt_assert(stream >> bar_);
28 bool BarrierTransition::depends(const Transition* o) const
31 return o->depends(this);
33 if (auto* other = dynamic_cast<const BarrierTransition*>(o)) {
34 if (bar_ != other->bar_)
37 // LOCK indep LOCK: requests are not ordered in a barrier
38 if (type_ == Type::BARRIER_LOCK && other->type_ == Type::BARRIER_LOCK)
41 // WAIT indep WAIT: requests are not ordered
42 if (type_ == Type::BARRIER_WAIT && other->type_ == Type::BARRIER_WAIT)
45 return true; // LOCK/WAIT is dependent because lock may enable wait
48 return false; // barriers are INDEP with non-barrier transitions
51 std::string MutexTransition::to_string(bool verbose) const
53 return xbt::string_printf("%s(mutex: %" PRIxPTR ", owner:%ld)", Transition::to_c_str(type_), mutex_, owner_);
56 MutexTransition::MutexTransition(aid_t issuer, int times_considered, Type type, std::stringstream& stream)
57 : Transition(type, issuer, times_considered)
59 xbt_assert(stream >> mutex_ >> owner_);
62 bool MutexTransition::depends(const Transition* o) const
65 return o->depends(this);
67 // type_ <= other->type_ in MUTEX_LOCK, MUTEX_TEST, MUTEX_TRYLOCK, MUTEX_UNLOCK, MUTEX_WAIT,
69 if (auto* other = dynamic_cast<const MutexTransition*>(o)) {
70 // Theorem 4.4.7: Any pair of synchronization actions of distinct actors concerning distinct mutexes are independent
71 if (mutex_ != other->mutex_)
74 // Theorem 4.4.11: LOCK indep TEST/WAIT.
75 // If both enabled, the result does not depend on their order. If WAIT is not enabled, LOCK won't enable it.
76 if (type_ == Type::MUTEX_LOCK && (other->type_ == Type::MUTEX_TEST || other->type_ == Type::MUTEX_WAIT))
79 // Theorem 4.4.8: LOCK indep UNLOCK.
80 // pop_front and push_back are independent.
81 if (type_ == Type::MUTEX_LOCK && other->type_ == Type::MUTEX_UNLOCK)
84 // TEST is a pure function; TEST/WAIT won't change the owner; TRYLOCK will always fail if TEST is enabled (because a
86 if (type_ == Type::MUTEX_TEST &&
87 (other->type_ == Type::MUTEX_TEST || other->type_ == Type::MUTEX_TRYLOCK || other->type_ == Type::MUTEX_WAIT))
90 // TRYLOCK will always fail if TEST is enabled (because a request is queued), and may not overpass the WAITed
91 // request in the queue
92 if (type_ == Type::MUTEX_TRYLOCK && other->type_ == Type::MUTEX_WAIT)
95 // FIXME: UNLOCK indep WAIT/TEST iff wait/test are not first in the waiting queue
99 return false; // mutexes are INDEP with non-mutex transitions
102 std::string SemaphoreTransition::to_string(bool verbose) const
104 if (type_ == Type::SEM_LOCK || type_ == Type::SEM_UNLOCK)
105 return xbt::string_printf("%s(semaphore: %" PRIxPTR ")", Transition::to_c_str(type_), sem_);
106 if (type_ == Type::SEM_WAIT)
107 return xbt::string_printf("%s(semaphore: %" PRIxPTR ", granted: %s)", Transition::to_c_str(type_), sem_,
108 granted_ ? "yes" : "no");
111 SemaphoreTransition::SemaphoreTransition(aid_t issuer, int times_considered, Type type, std::stringstream& stream)
112 : Transition(type, issuer, times_considered)
114 xbt_assert(stream >> sem_ >> granted_);
116 bool SemaphoreTransition::depends(const Transition* o) const
118 if (o->type_ < type_)
119 return o->depends(this);
121 if (auto* other = dynamic_cast<const SemaphoreTransition*>(o)) {
122 if (sem_ != other->sem_)
125 // LOCK indep UNLOCK: pop_front and push_back are independent.
126 if (type_ == Type::SEM_LOCK && other->type_ == Type::SEM_UNLOCK)
129 // LOCK indep WAIT: If both enabled, ordering has no impact on the result. If WAIT is not enabled, LOCK won't enable
131 if (type_ == Type::SEM_LOCK && other->type_ == Type::SEM_WAIT)
134 // UNLOCK indep UNLOCK: ordering of two pop_front has no impact
135 if (type_ == Type::SEM_UNLOCK && other->type_ == Type::SEM_UNLOCK)
139 // if both enabled (may happen in the initial value is sufficient), the ordering has no impact on the result.
140 // If only one enabled, the other won't be enabled by the first one.
141 // If none enabled, well, nothing will change.
142 if (type_ == Type::SEM_WAIT && other->type_ == Type::SEM_WAIT)
145 return true; // Other semaphore cases are dependent
148 return false; // semaphores are INDEP with non-semaphore transitions
152 } // namespace simgrid