'\" t
.\"     Title: zmq_inproc
.\"    Author: [see the "AUTHORS" section]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 03/20/2024
.\"    Manual: 0MQ Manual
.\"    Source: 0MQ 4.3.5
.\"  Language: English
.\"
.TH "ZMQ_INPROC" "7" "03/20/2024" "0MQ 4\&.3\&.5" "0MQ Manual"
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.SH "NAME"
zmq_inproc \- 0MQ local in\-process (inter\-thread) communication transport
.SH "SYNOPSIS"
.sp
The in\-process transport passes messages via memory directly between threads sharing a single 0MQ \fIcontext\fR\&.
.if n \{\
.sp
.\}
.RS 4
.it 1 an-trap
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.br
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\fBNote\fR
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.br
.sp
No I/O threads are involved in passing messages using the \fIinproc\fR transport\&. Therefore, if you are using a 0MQ \fIcontext\fR for in\-process messaging only you can initialise the \fIcontext\fR with zero I/O threads\&. See \fBzmq_init\fR(3) for details\&.
.sp .5v
.RE
.SH "ADDRESSING"
.sp
A 0MQ endpoint is a string consisting of a \fItransport\fR:// followed by an \fIaddress\fR\&. The \fItransport\fR specifies the underlying protocol to use\&. The \fIaddress\fR specifies the transport\-specific address to connect to\&.
.sp
For the in\-process transport, the transport is inproc, and the meaning of the \fIaddress\fR part is defined below\&.
.SS "Assigning a local address to a socket"
.sp
When assigning a local address to a \fIsocket\fR using \fIzmq_bind()\fR with the \fIinproc\fR transport, the \fIendpoint\fR shall be interpreted as an arbitrary string identifying the \fIname\fR to create\&. The \fIname\fR must be unique within the 0MQ \fIcontext\fR associated with the \fIsocket\fR and may be up to 256 characters in length\&. No other restrictions are placed on the format of the \fIname\fR\&.
.SS "Connecting a socket"
.sp
When connecting a \fIsocket\fR to a peer address using \fIzmq_connect()\fR with the \fIinproc\fR transport, the \fIendpoint\fR shall be interpreted as an arbitrary string identifying the \fIname\fR to connect to\&. Before version 4\&.0 he \fIname\fR must have been previously created by assigning it to at least one \fIsocket\fR within the same 0MQ \fIcontext\fR as the \fIsocket\fR being connected\&. Since version 4\&.0 the order of \fIzmq_bind()\fR and \fIzmq_connect()\fR does not matter just like for the tcp transport type\&.
.SH "EXAMPLES"
.PP
\fBAssigning a local address to a socket\fR. 
.sp
.if n \{\
.RS 4
.\}
.nf
//  Assign the in\-process name "#1"
rc = zmq_bind(socket, "inproc://#1");
assert (rc == 0);
//  Assign the in\-process name "my\-endpoint"
rc = zmq_bind(socket, "inproc://my\-endpoint");
assert (rc == 0);
.fi
.if n \{\
.RE
.\}
.PP
\fBConnecting a socket\fR. 
.sp
.if n \{\
.RS 4
.\}
.nf
//  Connect to the in\-process name "#1"
rc = zmq_connect(socket, "inproc://#1");
assert (rc == 0);
//  Connect to the in\-process name "my\-endpoint"
rc = zmq_connect(socket, "inproc://my\-endpoint");
assert (rc == 0);
.fi
.if n \{\
.RE
.\}
.sp
.SH "SEE ALSO"
.sp
\fBzmq_bind\fR(3) \fBzmq_connect\fR(3) \fBzmq_ipc\fR(7) \fBzmq_tcp\fR(7) \fBzmq_pgm\fR(7) \fBzmq_vmci\fR(7) \fBzmq\fR(7)
.SH "AUTHORS"
.sp
This page was written by the 0MQ community\&. To make a change please read the 0MQ Contribution Policy at \m[blue]\fBhttp://www\&.zeromq\&.org/docs:contributing\fR\m[]\&.