rt_task_ipc_init.2

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

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.TH RT_TASK_IPC_INIT 2 "26 July 1997" "rt_ipc" "rt_ipc"
.SH NAME
rt_task_ipc_init \- create a real-time task for use with rt_ipc
.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_task_ipc_init(RT_TASK_IPC * " task ", void (*" fn ")(int " data "), int " data ", int " stack_size ", int " priority ");
.SH DESCRIPTION
.B rt_task_ipc_init
creates a real-time task.  To make use of the IPC facilities of rt_ipc, you
should use
.B rt_task_ipc_init
instead of the standard
.B rt_task_init
provided by Real Time Linux.
.I task
is a structure the space for which must be provided by the application.
.I task
must be present during the lifetime of the real-time task; thus it cannot
be an automatic variable.  This corresponds to the RT_TASK structure which
is passed to 
.BR rt_task_init .
.I fn
is the entry point of the new task.  The parent task can send a one-integer
value
.I data
to the new task.
.I stack_size
is the size of the stack to be used by the new task, and 
.I priority
is the priority to be given the task.  The highest priority is 1, while
the lowest is RT_LOWEST_PRIORITY.
.PP
The newly created real-time task is initially dormant.  It is normally
made active by a call to 
.BR rt_task_make_periodic .
.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 task
is already in use by another task.
.IP \fB-ENOMEM\fP
space could not be allocated for the real-time task.
.SH "BUGS"
The RT_TASK_IPC type passed to
.B rt_task_ipc_init
is not compatible with the RT_TASK type passed to
.BR rt_task_init .
Use the macro MAKE_RT_TASK() to convert an RT_TASK_IPC to an RT_TASK when
calling a standard Real-Time Linux function.
.SH "AUTHOR"
Jerry Epplin <[e-mail]>
.SH "SEE ALSO"
.BR rt_mq_destroy (2),
.BR rt_mq_init (2),
.BR rt_mq_receive (2),
.BR rt_mq_send (2),
.BR rt_task_init (2),
.BR rt_task_ipc_delete (2), 
.BR rt_sem_destroy (2), 
.BR rt_sem_init (2), 
.BR rt_sem_post (2), 
.BR rt_sem_trywait (2), 
.BR rt_sem_wait (2)