Section (3) pthread_kill
pthread_kill — send a signal to a thread
Compile and link with
sends the signal
thread, a thread
in the same process as the caller. The signal is
asynchronously directed to
sig is 0, then
no signal is sent, but error checking is still performed.
returns 0; on error, it returns an error number, and no
signal is sent.
For an explanation of the terms used in this section, see attributes(7).
Signal dispositions are process-wide: if a signal handler
is installed, the handler will be invoked in the thread
thread, but if the
disposition of the signal is stop, continue, or
terminate, this action will affect the whole process.
The glibc implementation of
pthread_kill() gives an error (EINVAL) on attempts to send either of the
real-time signals used internally by the NPTL threading
implementation. See nptl(7) for details.
POSIX.1-2008 recommends that if an implementation detects
the use of a thread ID after the end of its lifetime,
pthread_kill() should return
the error ESRCH. The glibc
implementation returns this error in the cases where an
invalid thread ID can be detected. But note also that POSIX
says that an attempt to use a thread ID whose lifetime has
ended produces undefined behavior, and an attempt to use an
invalid thread ID in a call to
pthread_kill() can, for example, cause a
This page is part of release 4.16 of the Linux
man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
Copyright (c) 2009 Linux Foundation, written by Michael Kerrisk
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the
entire resulting derived work is distributed under the terms of a
permission notice identical to this one.
Since the Linux kernel and libraries are constantly changing, this
manual page may be incorrect or out-of-date. The author(s) assume no
responsibility for errors or omissions, or for damages resulting from
the use of the information contained herein. The author(s) may not
have taken the same level of care in the production of this manual,
which is licensed free of charge, as they might when working
Formatted or processed versions of this manual, if unaccompanied by
the source, must acknowledge the copyright and authors of this work.