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Server Model

Server(server, client, count, wait) :<=>    exists i in [1,C]:       or          receivei(server, request)  /\ count > 0  /\              sendi(client, grant)  /\ count' = count-1  /\              changed(server, client, count)          receivei(server, request)  /\   count > 0  /\              wait' = wait[i |-> true]  /\              changed(server, wait)          receivei(server, release)  /\ exists j in [1,C]: (wait[j]  /\              sendj(client, grant)  /\ wait' = wait[j |-> true])  /\              changed(server, client, wait)          receivei(server, release)  /\   exists j in [1,C]: wait[j]  /\              count' = count+1  /\              changed(server, count)

a server action     receive request and return grant     receive request and defer reply     receive release and send deferred grant     receive release and increase counter

Result of a systematic design.