[En-Nut-Discussion] rs232d: closing socket while other thread is write blocked on socket

[Ole Reinhardt]

Hi Henrik,

> It came to my attention that the rs232d.c demo actually closes the socket
> while the other thread could still be write blocked on it. In that scenario
> the socket is destroyed while being used.
>
> For example Receiver() is blocked in the fwrite() call while main()  returns
> from StreamCopy() due to connection break down and calls fclose(). 
> 
> Shouldn't in such a use case fwrite and fclose be synchronised by mutexes?

Indeed, you are right. I would say that a mutex is needed here.
Everywhere where a file descriptor or any other resource is shared by
two or more threads a mutex should be used. 

Bye,

Ole

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