https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203366

--- Comment #8 from Jan Kokemüller <[email protected]> ---
NetBSD does something similar, but in addition they trigger the wakeup on some
other condition (flag PIPE_SIGNALR):

https://github.com/NetBSD/src/blob/7c38ee86e0812f49fe3889bfc1c59757688d8d16/sys/kern/sys_pipe.c#L622

This flag is set for example if this is the first read(2) after a write(2). I'm
not quite sure yet why this is needed, though.

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