'\" t
.\"     Title: zmq_init
.\"    Author: [see the "AUTHORS" section]
.\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
.\"      Date: 04/04/2012
.\"    Manual: 0MQ Manual
.\"    Source: 0MQ 2.2.0
.\"  Language: English
.\"
.TH "ZMQ_INIT" "3" "04/04/2012" "0MQ 2\&.2\&.0" "0MQ Manual"
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.SH "NAME"
zmq_init \- initialise 0MQ context
.SH "SYNOPSIS"
.sp
\fBvoid *zmq_init (int \fR\fB\fIio_threads\fR\fR\fB);\fR
.SH "DESCRIPTION"
.sp
The \fIzmq_init()\fR function initialises a 0MQ \fIcontext\fR\&.
.sp
The \fIio_threads\fR argument specifies the size of the 0MQ thread pool to handle I/O operations\&. If your application is using only the \fIinproc\fR transport for messaging you may set this to zero, otherwise set it to at least one\&.
.PP
\fBThread safety\fR. A 0MQ
\fIcontext\fR
is thread safe and may be shared among as many application threads as necessary, without any additional locking required on the part of the caller\&.
.SH "RETURN VALUE"
.sp
The \fIzmq_init()\fR function shall return an opaque handle to the initialised \fIcontext\fR if successful\&. Otherwise it shall return NULL and set \fIerrno\fR to one of the values defined below\&.
.SH "ERRORS"
.PP
\fBEINVAL\fR
.RS 4
An invalid number of
\fIio_threads\fR
was requested\&.
.RE
.SH "SEE ALSO"
.sp
\fBzmq\fR(7) \fBzmq_term\fR(3)
.SH "AUTHORS"
.sp
This manual page was written by the 0MQ community\&.