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Added POSIX interpretation subsection and updated status.

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The message queue manager chapter needs to be updated to reflect
completion of the implementation.
This commit is contained in:
Joel Sherrill
2000-01-13 19:20:17 +00:00
parent 9c1c778d56
commit 2cef9771fb
2 changed files with 16 additions and 4 deletions
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doc/posix_users/message.t
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@@ -123,6 +123,21 @@ by passing a NULL to mq_notify, this removes any notification request
attached to the queue. Whenever the message queue is closed, all
notification attachments are removed.
@subsection POSIX Interpretation Issues
There is one significant point of interpretation related to
the RTEMS implementation of POSIX message queues:
@cite{What happens to threads already blocked on a message queue when the
mode of that same message queue is changed from blocking to non-blocking?}
The RTEMS POSIX implementation decided to unblock all waiting tasks
with an @code{EAGAIN} status just as if a non-blocking version of
the same operation had returned unsatisfied. This case is not
discussed in the POSIX standard and other implementations may have
chosen alternative behaviors.
@section Operations
@subsection Opening or Creating a Message Queue