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Author:halw

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Date:2011-02-08T17:02:28.000000Z


git-svn-id: https://svn.eiffel.com/eiffel-org/trunk@753 abb3cda0-5349-4a8f-a601-0c33ac3a8c38
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halw
2011-02-08 21:16:33 +00:00
parent 8cf0000c3a
commit ba4e141811
2 changed files with 17 additions and 3 deletions
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documentation/current/solutions/concurrent-computing/concurrent-eiffel-scoop/index.wiki
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@@ -134,6 +134,17 @@ So, according to this rule, for a separate call to be valid, the target of the c
In the code above, <code>my_separate_attribute</code> is a class attribute declared as a separate type. In the first line in <code>calling_routine</code> a direct feature call is made to apply <code>some_feature</code> to <code>my_separate_attribute</code>. This is an invalid separate call. The second line calls feature <code>enclosing_routine</code> and passes <code>my_separate_attribute</code> as an argument. <code>enclosing_routine</code> takes an argument of type <code>separate SOME_TYPE</code>. Within <code>enclosing_routine</code> it is valid to call <code>some_feature</code> on <code>a_arg</code>.
In <code>calling_routine</code> above, the call to <code>enclosing_routine</code> has a separate argument:
<code>
enclosing_routine (my_separate_attribute) -- Separate attribute passed as argument
</code>
Because the argument <code>my_separate_argument</code> is of a separate type, then it is subject to be handled by a processor different from the one on which the call to <code>enclosing_routine</code> occurs. As a result, the execution of <code>enclosing_routine</code> will be delayed until the time that the processor which handles <code>my_separate_argument</code> is available for exclusive access. This type of delay is described by the ''Wait rule''.
{{Rule|name=Wait|text=A routine call with separate arguments will execute when all corresponding processors are available and hold them exclusively for the duration of the routine.}}
{{SeeAlso|The <code>launch_producer</code> feature of the [[Producer-consumer|producer-consumer]] example, a feature which exists for the purpose of compliance with the separate argument rule.}}