Closing a socket

Closing a socket

[Kevin Curtis]

Hi,
	I have implemented a new socket address family and have noted that
from a multi-threaded application, if a thread calls close(fd) while a
second thread has a blocking read outstanding, the sockets release() is not
called.  Is this correct?  How can one unblock the read in order to do the
close.


Thanks

Kevin

Re: Closing a socket

[James Stevenson]

Hi

either use non-blocking sockets
or send a signal to the other process
to make it exit from the read.

> I have implemented a new socket address family and have noted that
> from a multi-threaded application, if a thread calls close(fd) while a
> second thread has a blocking read outstanding, the sockets release() is
not
> called.  Is this correct?  How can one unblock the read in order to do the
> close.
>

Re: Closing a socket

[Maksim (Max) Krasnyanskiy]

> > I have implemented a new socket address family and have noted that
> > from a multi-threaded application, if a thread calls close(fd) while a
> > second thread has a blocking read outstanding, the sockets release() is not
> > called.  Is this correct?  How can one unblock the read in order to do the
> > close.
You might want to implement shutdown(). Thread #1 will call shutdown() 
instead of
the close(). Your shutdown() implementation can do something like:
         sk->shutdown |= RCV_SHUTDOWN;
         sk->state_change(sk);
So, reader will wakeup, check shutdown mask and return error because socket was
shut down.

Max