Hm. The problem comes down to the fact that PerlIO calls the crt fstat() in order to determine if the file descriptor it is trying to clone, is attached to a "regular file".

As the file descriptor in question is currently in an accept state in another thread and the CRT serialises access, the fstat blocks. The entire Perl_clone() blocks, and the client threads are never started.

When I connect to the listener from an external process, the accept completes, which unlocks the file descriptor. Thus the fstat() returns allowing the Perl_clone to complete and the client threads get created.

The real problem here seems to be the hookey methods used inside PerlIO. There has to be a better way than to try to fstat() a socket, to determine if it is socket.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
"I'd rather go naked than blow up my ass"

In reply to Re^2: threads + sockets stalling question by BrowserUk
in thread threads + sockets stalling question by BrowserUk

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