-/* Copyright (c) 2015-2022. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2015-2023. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
#include "src/mc/transition/TransitionSynchro.hpp"
#include "xbt/asserts.h"
+#include "xbt/ex.h"
#include "xbt/string.hpp"
#include <inttypes.h>
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_trans_synchro, mc_transition, "Logging specific to MC synchronization transitions");
-namespace simgrid {
-namespace mc {
+namespace simgrid::mc {
+
+std::string BarrierTransition::to_string(bool verbose) const
+{
+ return xbt::string_printf("%s(barrier: %u)", Transition::to_c_str(type_), bar_);
+}
+BarrierTransition::BarrierTransition(aid_t issuer, int times_considered, Type type, std::stringstream& stream)
+ : Transition(type, issuer, times_considered)
+{
+ xbt_assert(stream >> bar_);
+}
+bool BarrierTransition::depends(const Transition* o) const
+{
+ if (o->type_ < type_)
+ return o->depends(this);
+
+ // Actions executed by the same actor are always dependent
+ if (o->aid_ == aid_)
+ return true;
+
+ if (const auto* other = dynamic_cast<const BarrierTransition*>(o)) {
+ if (bar_ != other->bar_)
+ return false;
+
+ // LOCK indep LOCK: requests are not ordered in a barrier
+ if (type_ == Type::BARRIER_ASYNC_LOCK && other->type_ == Type::BARRIER_ASYNC_LOCK)
+ return false;
+
+ // WAIT indep WAIT: requests are not ordered
+ if (type_ == Type::BARRIER_WAIT && other->type_ == Type::BARRIER_WAIT)
+ return false;
+
+ return true; // LOCK/WAIT is dependent because lock may enable wait
+ }
+
+ return false; // barriers are INDEP with non-barrier transitions
+}
+
std::string MutexTransition::to_string(bool verbose) const
{
- return xbt::string_printf("%s(mutex: %" PRIxPTR ", owner:%ld)", Transition::to_c_str(type_), mutex_, owner_);
+ return xbt::string_printf("%s(mutex: %" PRIxPTR ", owner: %ld)", Transition::to_c_str(type_), mutex_, owner_);
}
MutexTransition::MutexTransition(aid_t issuer, int times_considered, Type type, std::stringstream& stream)
if (o->type_ < type_)
return o->depends(this);
+ // Actions executed by the same actor are always dependent
+ if (o->aid_ == aid_)
+ return true;
+
// type_ <= other->type_ in MUTEX_LOCK, MUTEX_TEST, MUTEX_TRYLOCK, MUTEX_UNLOCK, MUTEX_WAIT,
- if (auto* other = dynamic_cast<const MutexTransition*>(o)) {
+ if (const auto* other = dynamic_cast<const MutexTransition*>(o)) {
// Theorem 4.4.7: Any pair of synchronization actions of distinct actors concerning distinct mutexes are independent
if (mutex_ != other->mutex_)
return false;
// Theorem 4.4.11: LOCK indep TEST/WAIT.
// If both enabled, the result does not depend on their order. If WAIT is not enabled, LOCK won't enable it.
- if (type_ == Type::MUTEX_LOCK && (other->type_ == Type::MUTEX_TEST || other->type_ == Type::MUTEX_WAIT))
+ if (type_ == Type::MUTEX_ASYNC_LOCK && (other->type_ == Type::MUTEX_TEST || other->type_ == Type::MUTEX_WAIT))
return false;
// Theorem 4.4.8: LOCK indep UNLOCK.
// pop_front and push_back are independent.
- if (type_ == Type::MUTEX_LOCK && other->type_ == Type::MUTEX_UNLOCK)
+ if (type_ == Type::MUTEX_ASYNC_LOCK && other->type_ == Type::MUTEX_UNLOCK)
return false;
// TEST is a pure function; TEST/WAIT won't change the owner; TRYLOCK will always fail if TEST is enabled (because a
return false;
// FIXME: UNLOCK indep WAIT/TEST iff wait/test are not first in the waiting queue
+ return true;
+ }
+
+ return false; // mutexes are INDEP with non-mutex transitions
+}
+
+std::string SemaphoreTransition::to_string(bool verbose) const
+{
+ if (type_ == Type::SEM_ASYNC_LOCK || type_ == Type::SEM_UNLOCK)
+ return xbt::string_printf("%s(semaphore: %u, capacity: %u)", Transition::to_c_str(type_), sem_, capacity_);
+ if (type_ == Type::SEM_WAIT)
+ return xbt::string_printf("%s(semaphore: %u, capacity: %u, granted: %s)", Transition::to_c_str(type_), sem_,
+ capacity_, granted_ ? "yes" : "no");
+ THROW_IMPOSSIBLE;
+}
+SemaphoreTransition::SemaphoreTransition(aid_t issuer, int times_considered, Type type, std::stringstream& stream)
+ : Transition(type, issuer, times_considered)
+{
+ xbt_assert(stream >> sem_ >> granted_ >> capacity_);
+}
+bool SemaphoreTransition::depends(const Transition* o) const
+{
+ if (o->type_ < type_)
+ return o->depends(this);
+
+ // Actions executed by the same actor are always dependent
+ if (o->aid_ == aid_)
+ return true;
+
+ if (const auto* other = dynamic_cast<const SemaphoreTransition*>(o)) {
+ if (sem_ != other->sem_)
+ return false;
+
+ // LOCK indep UNLOCK: pop_front and push_back are independent.
+ if (type_ == Type::SEM_ASYNC_LOCK && other->type_ == Type::SEM_UNLOCK)
+ return false;
+
+ // LOCK indep WAIT: If both enabled, ordering has no impact on the result. If WAIT is not enabled, LOCK won't enable
+ // it.
+ if (type_ == Type::SEM_ASYNC_LOCK && other->type_ == Type::SEM_WAIT)
+ return false;
+
+ // UNLOCK indep UNLOCK: ordering of two pop_front has no impact
+ if (type_ == Type::SEM_UNLOCK && other->type_ == Type::SEM_UNLOCK)
+ return false;
+
+ // UNLCOK indep with a WAIT if the semaphore had enought capacity anyway
+ if (type_ == Type::SEM_UNLOCK && capacity_ > 1 && other->type_ == Type::SEM_WAIT)
+ return false;
+
+ // WAIT indep WAIT:
+ // if both enabled (may happen in the initial value is sufficient), the ordering has no impact on the result.
+ // If only one enabled, the other won't be enabled by the first one.
+ // If none enabled, well, nothing will change.
+ if (type_ == Type::SEM_WAIT && other->type_ == Type::SEM_WAIT)
+ return false;
+
+ return true; // Other semaphore cases are dependent
}
- return true; // FIXME: TODO
+ return false; // semaphores are INDEP with non-semaphore transitions
}
-} // namespace mc
-} // namespace simgrid
+} // namespace simgrid::mc
