[QPID-1982] QMF ResilientConnection notifyFd feature portability

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Auto Closed
• Affects Version/s: 0.5
• Component/s: QMF

Environment

Windows

• Assignee: Unassigned
• Reporter: Stephen D. Huston
• Created: 13/Jul/09 19:02
• Updated: 14/Mar/18 20:27
• Resolved: 14/Mar/18 20:27

Description

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?

Issue Links

• is duplicated by: QPID-2251 Provide portable signal mechanism for the C++ QMF agent API
• is related to: QPID-1918 Patches/files for Windows QMF plug-in support