[zeromq-dev] zmq multithread bug
sustrik at 250bpm.com
Wed Jan 27 08:56:57 CET 2010
> Hi All, the sample code below publishes data into socket from two
> thread: One thread publishes "dummy", the other one publishes "from
> server: 1". But the data is not properly received on the other side,
> this is the print out:
The sockets are strictly non-thread-safe. There's no locking involved on
socket operations what makes 0mq as fast as it is. Therefore you
shouldn't write to a single socket from 2 threads.
If what you need is delivering messages from N sources to M destinations
via TCP you can either:
1. Explicitly connect from each receiver to each sender or vice versa.
Unless you have a stable set of client this would be a management nightmare.
2. Use zmq_forwarder device. All the senders will connect and send
messages to the device. All the receivers will connect and read messages
from the device. See examples/chat example.
3. Use multicast bus, either PGM or UDP. However, multicast has its own
set of drawbacks, so it not absolutely needed for perf reasons, go
rather with option 1 or 2.
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