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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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PTHREAD_KILL(3P) POSIX Programmer's Manual PTHREAD_KILL(3P)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
pthread_kill — send a signal to a thread
#include <signal.h>
int pthread_kill(pthread_t thread, int sig);
The pthread_kill() function shall request that a signal be
delivered to the specified thread.
As in kill(), if sig is zero, error checking shall be performed
but no signal shall actually be sent.
Upon successful completion, the function shall return a value of
zero. Otherwise, the function shall return an error number. If
the pthread_kill() function fails, no signal shall be sent.
The pthread_kill() function shall fail if:
EINVAL The value of the sig argument is an invalid or unsupported
signal number.
The pthread_kill() function shall not return an error code of
[EINTR].
The following sections are informative.
None.
The pthread_kill() function provides a mechanism for
asynchronously directing a signal at a thread in the calling
process. This could be used, for example, by one thread to affect
broadcast delivery of a signal to a set of threads.
Note that pthread_kill() only causes the signal to be handled in
the context of the given thread; the signal action (termination or
stopping) affects the process as a whole.
If an implementation detects use of a thread ID after the end of
its lifetime, it is recommended that the function should fail and
report an [ESRCH] error.
Existing implementations vary on the result of a pthread_kill()
with a thread ID indicating an inactive thread (a terminated
thread that has not been detached or joined). Some indicate
success on such a call, while others give an error of [ESRCH].
Since the definition of thread lifetime in this volume of
POSIX.1‐2017 covers inactive threads, the [ESRCH] error as
described is inappropriate in this case. In particular, this means
that an application cannot have one thread check for termination
of another with pthread_kill().
A future version of this standard may require that pthread_kill()
not fail with [ESRCH] in the case of sending signals to an
inactive thread (a terminated thread not yet detached or joined),
even though no signal will be delivered because the thread is no
longer running.
kill(3p), pthread_self(3p), raise(3p)
The Base Definitions volume of POSIX.1‐2017, signal.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 by the Institute of Electrical and Electronics Engineers,
Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard,
the original IEEE and The Open Group Standard is the referee
document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 PTHREAD_KILL(3P)
Pages that refer to this page: signal.h(0p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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