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+'\" t
+.\" Copyright (c) 2009 Linux Foundation, written by Michael Kerrisk
+.\"     <mtk.manpages@gmail.com>
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.TH pthread_kill 3 2023-07-20 "Linux man-pages 6.05.01"
+.SH NAME
+pthread_kill \- send a signal to a thread
+.SH LIBRARY
+POSIX threads library
+.RI ( libpthread ", " \-lpthread )
+.SH SYNOPSIS
+.nf
+.B #include <signal.h>
+.PP
+.BI "int pthread_kill(pthread_t " thread ", int " sig );
+.fi
+.PP
+.RS -4
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.RE
+.PP
+.BR pthread_kill ():
+.nf
+    _POSIX_C_SOURCE >= 199506L || _XOPEN_SOURCE >= 500
+.fi
+.SH DESCRIPTION
+The
+.BR pthread_kill ()
+function sends the signal
+.I sig
+to
+.IR thread ,
+a thread in the same process as the caller.
+The signal is asynchronously directed to
+.IR thread .
+.PP
+If
+.I sig
+is 0, then no signal is sent, but error checking is still performed.
+.SH RETURN VALUE
+On success,
+.BR pthread_kill ()
+returns 0;
+on error, it returns an error number, and no signal is sent.
+.SH ERRORS
+.TP
+.B EINVAL
+An invalid signal was specified.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR pthread_kill ()
+T}	Thread safety	MT-Safe
+.TE
+.sp 1
+.SH VERSIONS
+The glibc implementation of
+.BR pthread_kill ()
+gives an error
+.RB ( EINVAL )
+on attempts to send either of the real-time signals
+used internally by the NPTL threading implementation.
+See
+.BR nptl (7)
+for details.
+.PP
+POSIX.1-2008 recommends that if an implementation detects the use
+of a thread ID after the end of its lifetime,
+.BR pthread_kill ()
+should return the error
+.BR 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
+.BR pthread_kill ()
+can, for example, cause a segmentation fault.
+.SH STANDARDS
+POSIX.1-2008.
+.SH HISTORY
+POSIX.1-2001.
+.SH NOTES
+Signal dispositions are process-wide:
+if a signal handler is installed,
+the handler will be invoked in the thread
+.IR thread ,
+but if the disposition of the signal is "stop", "continue", or "terminate",
+this action will affect the whole process.
+.SH SEE ALSO
+.BR kill (2),
+.BR sigaction (2),
+.BR sigpending (2),
+.BR pthread_self (3),
+.BR pthread_sigmask (3),
+.BR raise (3),
+.BR pthreads (7),
+.BR signal (7)