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c-user: Clarify return code related terms
Remove duplicate "return code" definition. Add all related terms and use references. Update #3853.
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@ -177,6 +177,9 @@ Glossary
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The address at which a function or task begins to execute. In C, the
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entry point of a function is the function's name.
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error code
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This term has the same meaning as :term:`status code`.
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events
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A method for task communication and synchronization. The directives
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provided by the event manager are used to service events.
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@ -540,9 +543,6 @@ Glossary
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The manipulation of an object which does not reside on the same node as
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the calling task.
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return code
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Also known as error code or return value.
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resource
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A hardware or software entity to which access must be controlled.
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@ -552,8 +552,11 @@ Glossary
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available for scheduling.
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return code
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A value returned by RTEMS directives to indicate the completion status of
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the directive.
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This term has the same meaning as :term:`status code`.
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return value
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The value returned by a function. A return value may be a
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:term:`status code`.
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RNCB
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An acronym for :term:`Region Control Block`.
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@ -653,7 +656,10 @@ Glossary
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store return information and local variables.
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status code
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Also known as error code or return value.
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A status code indicates the completion status of an operation. For
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example most RTEMS directives return a status code through the
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:term:`return value` to indicate a successful operation or error
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conditions.
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suspend
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A term used to describe a task that is not competing for the CPU because it
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