Re: [Quickfix-developers] Sending messages from different threads on the same session....

[<OM...@th...>]

Thanks for this report.  This had been discovered previously and a fix was
checked in last month.  The fix is just what you suggest except that the
mutex was moved from send into sendRaw, instead of adding an additional
lock. Here is a link to the diff.

http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/quickfix/quickfix/src/C%2b%2b/Session.cpp.diff?r1=1.5&r2=1.6

--oren



|---------+----------------------------------------------->
|         |           "Stancescu Constantin"              |
|         |           <Con...@sw...>      |
|         |           Sent by:                            |
|         |           qui...@li...|
|         |           ceforge.net                         |
|         |                                               |
|         |                                               |
|         |           02/14/2003 11:25 AM                 |
|         |                                               |
|---------+----------------------------------------------->
  >----------------------------------------------------------------------------------------------|
  |                                                                                              |
  |       To:       <qui...@li...>                                  |
  |       cc:                                                                                    |
  |       Subject:  [Quickfix-developers] Sending messages from different threads on the same    |
  |        session....                                                                           |
  >----------------------------------------------------------------------------------------------|




My application does this, in fact most applications
will have at least two potential senders:
1.The working thread of the application that sends
business messages.
2.The receiving thread in case errors or other type of
responses.

The sendRaw functions works like:

1.  getNextSenderMsgSeqNum called by Fill(header);
............................................
2. send( message.toString() );
............................................
3. m_state.set( msgSeqNum, message.toString() );
4. m_state.incrNextSenderMsgSeqNum();

Imagine a thread switch from Thread_A to Thread_B with
1. <  Thread_A  < 4.

-->> BOTH THREADS ARE GETTING THE SAME SEQUENCE NUMBER
       FOR DIFFERENT MESSAGES !!

One line of code at the very begin of sendRaw solved my problem

             Locker l(m_mutex);

I suggest to include this in the base code:
1.If an application always sends messages from only one thread
it will not harm.
2.If an application sends messages from several threads
it is needed.

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