void *zmq_init (int io_threads);
The zmq_init() function initialises a 0MQ context.
The io_threads argument specifies the size of the 0MQ thread pool to handle I/O operations. If your application is using only the inproc transport for messaging you may set this to zero, otherwise set it to at least one.
The zmq_init() function shall return an opaque handle to the initialised context if successful. Otherwise it shall return NULL and set errno to one of the values defined below.
The 0MQ documentation was written by Martin Sustrik <m[blue]email@example.com> and Martin Lucina <m[blue]firstname.lastname@example.org>.