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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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- One or more remote procedures; the
formal parameters of the procedure(s) shall all be of mode in;
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- The first subtype of a remote access-to-procedure
type; the formal parameters of the designated profile of the type shall
all be of mode in;
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- The first subtype of a remote access-to-class-wide
type.
Static Semantics
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{representation pragma (Asynchronous)
[partial]} {pragma, representation
(Asynchronous) [partial]} 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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{remote procedure call (asynchronous)}
{asynchronous (remote procedure
call)} 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.
10.a
To be honest: It is not
clear that this rule can be tested or even defined formally.
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