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E.4.1 Pragma Asynchronous

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This subclause introduces the pragma Asynchronous which allows a remote subprogram call to return prior to completion of the execution of the corresponding remote subprogram body. 

Syntax

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The form of a pragma Asynchronous is as follows: 
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  pragma Asynchronous(local_name);

Legality Rules

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The local_name of a pragma Asynchronous shall denote either: 
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Static Semantics

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A pragma Asynchronous is a representation pragma. When applied to a type, it specifies the type-related asynchronous aspect of the type. 

Dynamic Semantics

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A remote call is asynchronous if it is a call to a procedure, or a call through a value of an access-to-procedure type, to which a pragma Asynchronous applies. In addition, if a pragma Asynchronous applies to a remote access-to-class-wide type, then a dispatching call on a procedure with a controlling operand designated by a value of the type is asynchronous if the formal parameters of the procedure are all of mode in

Implementation Requirements

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Asynchronous remote procedure calls shall be implemented such that the corresponding body executes at most once as a result of the call. 

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