[noPoll] Deadlock

[Francis Brosnan Blázquez]

Hi Ondrej,

Thanks for reporting. I haven't had time to review it and let you know,

I'll keep you updated about this,
Best Regards,


> Hi,
> 
> I am using the function nopoll_thread_handlers to make the library thread safe
> 
> ************************************
> noPollPtr WebSocket::mutexCreate(void)
> {
>     std::mutex * mutex = new std::mutex;
>     std::cout<<".................create"<<std::endl;
>     return static_cast<noPollPtr>(mutex);
> }
> 
> void WebSocket::mutexDestroy(noPollPtr _mutex)
> {
>     std::cout<<".................destroy"<<std::endl;
>     std::mutex * mutex = static_cast<std::mutex *>(_mutex);
>     delete mutex;
> }
> 
> void WebSocket::mutexLock(noPollPtr _mutex)
> {
>     std::cout<<".................lock"<<std::endl;
>     std::mutex * mutex = static_cast<std::mutex *>(_mutex);
>     mutex->lock();
> }
> 
> void WebSocket::mutexUnlock(noPollPtr _mutex)
> {
>     std::cout<<".................unlock"<<std::endl;
>     std::mutex * mutex = static_cast<std::mutex *>(_mutex);
>     mutex->unlock();
> }
> 
> nopoll_thread_handlers(&WebSocket::mutexCreate,
> &WebSocket::mutexDestroy, &WebSocket::mutexLock,
> &WebSocket::mutexUnlock);
> 
> ***********************************
> 
> When the socket closes (timeout on TCP socket) the library dead-locks
> DEBUG PRINT:
> 
> ***********************************
> (proc 9668): (debug)nopoll_conn.c:3008 nopoll_conn_send_text:
> Attempting to send 16 bytes
> 
> (proc 9668): (debug)nopoll_conn.c:3691 Copying into the buffer 6 bytes
> of header (total memory allocated: 23)
> 
> (proc 9668): (debug)nopoll_conn.c:3705 Mask used for this delivery:
> -604747364 (about to send 22 bytes)
> 
> (proc 9668): (debug)nopoll_conn.c:3743 Bytes written to the wire 22
> (masked? 1, mask: 1133566964, header size: 6, length: 16)
> 
> (proc 9668): (debug)nopoll_conn.c:3781 Write operation finished with
> with last result=16, bytes_written=16, requested=16, remaining=0
> (conn-id=2)
> 
> .................lock
> 
> .................unlock
> 
> .................lock
> 
> .................unlock
> 
> .................lock
> 
> (proc 9668): (debug)nopoll_conn.c:2518 === START: conn-id=2 (errno=11,
> session: 6, conn->handshake_ok: 1, conn->pending_ssl_accept: 0) ===
> 
> (proc 9668): (critical) nopoll_conn.c:1876 unable to readn=2, error
> code was: 110 (Connection timed out) (shutting down connection)
> 
> (proc 9668): (debug)nopoll_conn.c:1436 shutting down connection id=2
> (session: 6, role: client)
> 
> (proc 9668): (critical) nopoll_conn.c:2695 Received connection close,
> finishing connection session
> 
> (proc 9668): (debug)nopoll_conn.c:1436 shutting down connection id=2
> (session: -1, role: client)
> 
> .................unlock
> 
> .................lock
> 
> .................lock
> **************************************
> 
> The problem happens because the function nopoll_ctx_foreach_conn locks
> the mutex and function nopoll_ctx_unregister_conn tries to lock the
> mutex again.
> _______________________________________________
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-- 
Francis Brosnan Blázquez  -  ASPL
http://www.asplhosting.com/
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