rt_mq_init.2

rtlinux(realtime linix)3.0,在kernel2.2.18上编译运行

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.TH RT_MQ_INIT 2 "26 July 1997" "rt_ipc" "rt_ipc"
.SH NAME
rt_mq_init \- create a message queue
.SH SYNOPSIS
.nf
.B #define MODULE
.B #include <linux/module.h> 
.B #include <linux/kernel.h> 
.B #include <linux/version.h> 
.B #include <linux/errno.h> 
.B #include "rt_ipc.h"
.fi
.sp
.BI "int rt_mq_init(rt_mq_t *" mq ", int " max_msgs ", int " msg_size ");
.SH DESCRIPTION
.B rt_mq_init
is called to initialize a real-time message queue.  A message queue can
be used for communicating data among real-time tasks.  Communication
between Linux processes and real-time tasks is done using the standard
Real-Time Linux RT-FIFO facilities.
.PP
.I mq
must point to a statically allocated structure.
.I max_msgs
is the maximum number of messages allowed, and
.I msg_size
is the size of each message.
.SH "RETURN VALUE"
On success, 0 is returned.  On failure, a negative value is returned
as described below.
.SH ERRORS
.IP \fB-EINVAL\fP
.I msg_size
is negative, or
.I max_msgs
is less than one.
.IP \fB-ENOMEM\fP
Space could not be allocated for the message queue.
.SH "BUGS"
Priority inheritance is not currently supported.
.SH "AUTHOR"
Jerry Epplin <[e-mail]>
.SH "SEE ALSO"
.BR rt_mq_destroy (2),
.BR rt_mq_receive (2),
.BR rt_mq_send (2),
.BR rt_task_ipc_delete (2), 
.BR rt_task_ipc_init (2)