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Update README.md #574

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Expand Up @@ -576,6 +576,33 @@ We call this limitation primitive "tickets". In this case, the resource access
is limited to 5 tickets (see Configuration). The timeout value specifies the
maximum amount of time to block if no ticket is available.

```mermaid

graph TD;
Start[Start]
CheckConnection{Request Connection to Resource}
AllocateTicket[Allocate Ticket if Available]
BlockTimeout[Block until Timeout or Ticket Available]
AccessResource[Access Resource]
ReleaseTicket[Release Ticket]
FailRequest[Fail Request]
OpenCircuit[Open Circuit Breaker]

Start --> CheckConnection
CheckConnection -->|Ticket Available| AllocateTicket
AllocateTicket --> AccessResource
AccessResource --> ReleaseTicket
ReleaseTicket --> CheckConnection

CheckConnection -->|No Ticket Available| BlockTimeout
BlockTimeout -->|Timeout| FailRequest
BlockTimeout -->|Ticket Available| AccessResource

FailRequest --> OpenCircuit
OpenCircuit --> CheckConnection

```

How do we limit the access to a resource for all workers on a server when the
workers do not directly share memory? This is implemented with [SysV
semaphores][sysv] to provide server-wide access control.
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