... it fails in multithreaded mode during the fdopen() with a "Bad file descriptor" error.

The likely cause is that you are allowing the original file handle to go out of scope and get garbage collected (closed) before the thread to which you pass the fileno has a chance to dup it.

One way to tackle this is to save a copy of the file handle in a hash indexed by it's fileno within the accept thread and then have a separate queue that the responder threads post the filenos to when they close them. The accept thread then monitors this queue and when a fileno is posted to it, it retrieves it and uses it to delete the relevant key from the socket cache to complete the cleanup.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
The "good enough" maybe good enough for the now, and perfection maybe unobtainable, but that should not preclude us from striving for perfection, when time, circumstance or desire allow.

In reply to Re: Passing sockets between segregated threads by BrowserUk
in thread Passing sockets between segregated threads by renodino

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