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While sending very large messages (far beyond what fits in a the tcp buffer, so it takes multiple sendto system calls for it to finish), zmq_close will close the connection regardless of ZMQ_LINGER. In case no engine is attached, a pipe->check_read() is needed to look for the delimiter in the pipe and ultimately trigger the pipe termination. However, if there *is* an engine attached, the check_read() looks ahead and finds the delimiter and terminates the connection even though the engine might actually still be in the middle of sending a message. This happens because while the io_thread is still busy sending the data, the pipe can get terminated and the io thread ends up being terminated.
ZeroMQ
Welcome
The ZeroMQ lightweight messaging kernel is a library which extends the standard socket interfaces with features traditionally provided by specialised messaging middleware products. ZeroMQ sockets provide an abstraction of asynchronous message queues, multiple messaging patterns, message filtering (subscriptions), seamless access to multiple transport protocols and more.
Building and installation
See the INSTALL file included with the distribution.
Resources
Extensive documentation is provided with the distribution. Refer to doc/zmq.html, or "man zmq" after you have installed libzmq on your system.
Website: http://www.zeromq.org/
Development mailing list: zeromq-dev@lists.zeromq.org Announcements mailing list: zeromq-announce@lists.zeromq.org
Git repository: http://github.com/zeromq/libzmq
ZeroMQ developers can also be found on the IRC channel #zeromq, on the Freenode network (irc.freenode.net).
License
The project license is specified in COPYING and COPYING.LESSER.
libzmq is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License (LGPL) as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.
As a special exception, the Contributors give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you must extend this exception to your version of the library.
libzmq is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.