9.7.2 Timed Entry Calls

A timed_entry_call issues an entry call that is cancelled if the call (or a requeue-with-abort of the call) is not selected before the expiration time is reached.
Syntax

timed_entry_call ::=
   select
      entry_call_alternative
   or
      delay_alternative
   end select;

entry_call_alternative ::=
   entry_call_statement [sequence_of_statements]

Dynamic Semantics

For the execution of a timed_entry_call, the entry_name and the actual parameters are evaluated, as for a simple entry call, See section 9.5.3 Entry Calls. The expiration time, See section 9.6 Delay Statements, Duration, and Time for the call is determined by evaluating the delay_expression of the delay_alternative; the entry call is then issued.
If the call is queued (including due to a requeue-with-abort), and not selected before the expiration time is reached, an attempt to cancel the call is made. If the call completes due to the cancellation, the optional sequence_of_statements of the delay_alternative is executed; if the entry call completes normally, the optional sequence_of_statements of the entry_call_alternative is executed.
Examples
Example of a timed entry call:

select
   Controller.Request(Medium)(Some_Item);
or
   delay 45.0;
   --  controller too busy, try something else
end select;