Section (2) tkill
tkill, tgkill — send a signal to a thread
|There is no glibc wrapper for|
.BR tkill (); see NOTES.
tgkill() sends the signal
sig to the thread
with the thread ID
tid in the thread group
tgid. (By contrast,
kill(2) can be used to send
a signal only to a process (i.e., thread group) as a whole,
and the signal will be delivered to an arbitrary thread
within that process.)
tkill() is an obsolete
allows only the target thread ID to be specified, which may
result in the wrong thread being signaled if a thread
terminates and its thread ID is recycled. Avoid using this
These are the raw system call interfaces, meant for internal thread library use.
On success, zero is returned. On error, −1 is
errno is set
RLIMIT_SIGPENDINGresource limit was reached and
sigis a real-time signal.
Insufficient kernel memory was available and
sigis a real-time signal.
An invalid thread ID, thread group ID, or signal was specified.
Permission denied. For the required permissions, see kill(2).
No process with the specified thread ID (and thread group ID) exists.
tkill() is supported since
Linux 2.4.19 / 2.5.4.
was added in Linux 2.5.75.
Library support for
was added to glibc in version 2.30.
tgkill() are Linux-specific and should not
be used in programs that are intended to be portable.
See the description of
CLONE_THREAD in clone(2) for an explanation
of thread groups.
Glibc does not provide a wrapper for
tkill(); call it using syscall(2). Before glibc
2.30, there was also no wrapper function for
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Copyright (C) 2008 Michael Kerrisk <tmk.manpagesgmail.com>
and Copyright 2003 Abhijit Menon-Sen <amswiw.org>
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2004-05-31, added tgkill, ahu, aeb
2008-01-15 mtk -- rewrote DESCRIPTION