----- Original Message -----From: Michael Chisholm <chisholm@mitre.org>
To: boost-users@lists.boost.org

On 5/10/2012 5:34 PM, Michael Chisholm wrote:
> On 5/10/2012 10:38 AM, Igor R wrote:
>>> hi all,
>>> I use ip::tcp::iostream but I don't know if it is thread safe, and I
>>> cannot find the answer in boost document.
>>> I read from ip::tcp::iostream in the receiver thread, and send
>>> request in another thread.
>>> Now I protected the stream with a mutex. But the problem is that, if
>>> I do not send request, the server will not response,
>>> and the receiver will block on read with lock, and the sender cannot
>>> hold the lock and cannot send the request, deadlock.
>>>
>>> Is there anyone know that? Please kindly give me an answer.
>>
>>
>> As far as I can see, it's not thread-safe.
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>
> Definitely not. I had to create my own socket-based stream with
> boost.iostreams to avoid crashes.
>
> Andy

I should add that boost.iostreams isn't thread-safe either.  But you can 
create different istream and ostream objects which wrap the same 
underlying raw socket descriptor, to get concurrent reads and writes to 
the socket.

Andy

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