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https://issues.apache.org/jira/browse/QPID-1982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12797149#action_12797149
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Alan Conway commented on QPID-1982:
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We already have portable constructs for this type of notification.
sys::PollableCondition is a low-level, portable mechanism that can be added to
a Poller and allows you to wake a poller thread by setting the condition.
sys::PollableQueue template is built on top of pollable condition. It allows
dispatch to poller threads via an in-memory queue.
I suspect PollableQueue is what's needed: replacing the use of ::write with a
push to the pollable queue. If not a new portable mechansim can probably be
built based on PollableCondition.
> QMF ResilientConnection notifyFd feature portability
> ----------------------------------------------------
>
> Key: QPID-1982
> URL: https://issues.apache.org/jira/browse/QPID-1982
> Project: Qpid
> Issue Type: Improvement
> Components: Qpid Managment Framework
> Affects Versions: 0.5
> Environment: Windows
> Reporter: Steve Huston
>
> The QMF's C++ qmfcommon ResilientConnection class has a setNotifyFd (int fd)
> method. The docs say this can receive a file descriptor that is written on
> when certain events take place, supposedly so the other end of the channel
> can listen, select, etc. and be notified of some event.
> This construct isn't portable, both because of the datatype of the fd (int is
> not necessarily a legit handle type everywhere) and because the code assumes
> a write() will work. The code can be abstracted out to get rid of the write()
> easily enough, but what is the usage for this facility? There are no calls to
> setNotifyFd() that I can find outside of the library containing the
> implementation. So I can't tell if this is something that can be replaced by
> qpid::sys::PollableCondition or not.
> What is the use case for this, and how can we make this portable? Different
> IPC type? Callback to some private hook?
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