| ⇢ | A | NullMutex added | |
| ⇢ | A | LockAdapterMutex added |
| ⇢ | A | LockAdapterMutex::releaseLock() added | |
| ⇢ | A | LockAdapterMutex::acquireLock() added | |
| ⇢ | A | NullMutex::releaseLock() added | |
| ⇢ | A | NullMutex::acquireLock() added | |
| ⇢ | A | LockAdapterMutex::__construct() added | |
| ⇢ | A | LockAdapterMutex::isAcquired() added | |
| ⇢ | A | LockAdapterMutex::isLocked() added | |
| ⇢ | A | NullMutex::isAcquired() added | |
| ⇢ | A | NullMutex::isLocked() added | |
| A | ↘ | B | Statemachine::__construct() got worse |