@startuml
scale 700 height
skinparam backgroundColor transparent
skinparam shadowing false
skinparam defaultFontName Monospace
skinparam defaultFontSize 12
skinparam stateBorderColor #2c7794
skinparam stateBackgroundColor #edf6fa
title A6 STATE — bit mask and blocked participants
[*] --> Zero : 01 0x00
Zero --> ReadyA : 03 set 0x01
ReadyA --> Partial : 04 sync A
Partial : bits 0x11
Partial : coordinator Blocked
Partial : worker A Blocked
Partial --> ReadyAll : set READY_B
ReadyAll : return 0x03 to coordinator
ReadyAll --> BarrierAC : clear READY; set SYNC_C
BarrierAC : bits 0x50
BarrierAC --> Release : 10 set SYNC_B
Release : all return 0x70
Release --> Zero : auto-clear sync mask
Zero --> [*] : 11 PASS
@enduml