Update copyright lines for 2022.

[simgrid.git] / src / kernel / actor / SimcallObserver.cpp

diff --git a/src/kernel/actor/SimcallObserver.cpp b/src/kernel/actor/SimcallObserver.cpp
index 11e9e2c..8903daa 100644 (file)
--- a/src/kernel/actor/SimcallObserver.cpp
+++ b/src/kernel/actor/SimcallObserver.cpp
@@ -1,4 +1,4 @@
-/* Copyright (c) 2019-2021. The SimGrid Team. All rights reserved.          */
+/* Copyright (c) 2019-2022. 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. */
@@ -14,6 +14,38 @@ namespace simgrid {
 namespace kernel {
 namespace actor {
 
+bool SimcallObserver::depends(SimcallObserver* other)
+{
+  THROW_UNIMPLEMENTED;
+}
+/* Random is only dependent when issued by the same actor (ie, always independent) */
+bool RandomSimcall::depends(SimcallObserver* other)
+{
+  return get_issuer() == other->get_issuer();
+}
+bool MutexSimcall::depends(SimcallObserver* other)
+{
+  if (dynamic_cast<RandomSimcall*>(other) != nullptr)
+    return other->depends(this); /* Other is random, that is very permissive. Use that relation instead. */
+
+#if 0 /* This code is currently broken and shouldn't be used. We must implement asynchronous locks before */
+  MutexSimcall* that = dynamic_cast<MutexSimcall*>(other);
+  if (that == nullptr)
+    return true; // Depends on anything we don't know
+
+  /* Theorem 4.4.7: Any pair of synchronization actions of distinct actors concerning distinct mutexes are independent */
+  if (this->get_issuer() != that->get_issuer() && this->get_mutex() != that->get_mutex())
+    return false;
+
+  /* Theorem 4.4.8 An AsyncMutexLock is independent with a MutexUnlock of another actor */
+  if (((dynamic_cast<MutexLockSimcall*>(this) != nullptr && dynamic_cast<MutexUnlockSimcall*>(that)) ||
+       (dynamic_cast<MutexLockSimcall*>(that) != nullptr && dynamic_cast<MutexUnlockSimcall*>(this))) &&
+      get_issuer() != other->get_issuer())
+    return false;
+#endif
+  return true; // Depend on things we don't know for sure that they are independent
+}
+
 std::string SimcallObserver::to_string(int /*times_considered*/) const
 {
   return simgrid::xbt::string_printf("[(%ld)%s (%s)] ", issuer_->get_pid(), issuer_->get_host()->get_cname(),
@@ -60,9 +92,10 @@ std::string MutexUnlockSimcall::dot_label() const
 
 std::string MutexLockSimcall::to_string(int times_considered) const
 {
+  auto mutex      = get_mutex();
   std::string res = SimcallObserver::to_string(times_considered) + (blocking_ ? "Mutex LOCK" : "Mutex TRYLOCK");
-  res += "(locked = " + std::to_string(mutex_->is_locked());
-  res += ", owner = " + std::to_string(mutex_->get_owner() ? mutex_->get_owner()->get_pid() : -1);
+  res += "(locked = " + std::to_string(mutex->is_locked());
+  res += ", owner = " + std::to_string(mutex->get_owner() ? mutex->get_owner()->get_pid() : -1);
   res += ", sleeping = n/a)";
   return res;
 }
@@ -74,7 +107,7 @@ std::string MutexLockSimcall::dot_label() const
 
 bool MutexLockSimcall::is_enabled() const
 {
-  return not blocking_ || mutex_->get_owner() == nullptr || mutex_->get_owner() == get_issuer();
+  return not blocking_ || get_mutex()->get_owner() == nullptr || get_mutex()->get_owner() == get_issuer();
 }
 
 std::string ConditionWaitSimcall::to_string(int times_considered) const