113 lines
3.3 KiB
Groff
113 lines
3.3 KiB
Groff
.\" Copyright (c) 2016 The FreeBSD Foundation, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This documentation was written by
|
|
.\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship
|
|
.\" from the FreeBSD Foundation.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd September 23, 2016
|
|
.Dt THR_WAKE 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm thr_wake
|
|
.Nd wake up the suspended thread
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In sys/thr.h
|
|
.Ft int
|
|
.Fn thr_wake "long id"
|
|
.Sh DESCRIPTION
|
|
.Bf -symbolic
|
|
This function is intended for implementing threading.
|
|
Normal applications should use
|
|
.Xr pthread_cond_timedwait 3
|
|
together with
|
|
.Xr pthread_cond_broadcast 3
|
|
for typical safe suspension with cooperation of the thread
|
|
being suspended, or
|
|
.Xr pthread_suspend_np 3
|
|
and
|
|
.Xr pthread_resume_np 3
|
|
in some specific situations, instead.
|
|
.Ef
|
|
.Pp
|
|
Passing the thread identifier of the calling thread
|
|
.Po
|
|
see
|
|
.Xr thr_self 2
|
|
.Pc
|
|
to
|
|
.Fn thr_wake
|
|
sets a thread's flag to cause the next signal-interruptible sleep
|
|
of that thread in the kernel to fail immediately with the
|
|
.Er EINTR
|
|
error.
|
|
The flag is cleared by an interruptible sleep attempt or by a call to
|
|
.Xr thr_suspend 2 .
|
|
This is used by the system threading library to implement cancellation.
|
|
.Pp
|
|
If
|
|
.Fa id
|
|
is not equal to the current thread identifier, the specified thread is
|
|
woken up if suspended by the
|
|
.Xr thr_suspend
|
|
system call.
|
|
If the thread is not suspended at the time of the
|
|
.Nm
|
|
call, the wake is remembered and the next attempt of the thread to
|
|
suspend itself with the
|
|
.Xr thr_suspend 2
|
|
results in immediate return with success.
|
|
Only one wake is remembered.
|
|
.Sh RETURN VALUES
|
|
.Rv -std thr_wake
|
|
.Sh ERRORS
|
|
The
|
|
.Fn thr_wake
|
|
operation returns these errors:
|
|
.Bl -tag -width Er
|
|
.It Bq Er ESRCH
|
|
The specified thread was not found or does not belong to the process
|
|
of the calling thread.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr ps 1 ,
|
|
.Xr thr_self 2 ,
|
|
.Xr thr_suspend 2 ,
|
|
.Xr pthread_cancel 3 ,
|
|
.Xr pthread_resume_np 3 ,
|
|
.Xr pthread_suspend_np 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn thr_suspend
|
|
system call is non-standard and is used by
|
|
.Lb libthr
|
|
to implement
|
|
.St -p1003.1-2001
|
|
.Xr pthread 3
|
|
functionality.
|