PROLOG

       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.

NAME

       pthread_kill — send a signal to a thread

SYNOPSIS

       #include <signal.h>

       int pthread_kill(pthread_t thread, int sig);

DESCRIPTION

       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.

RETURN VALUE

       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.

ERRORS

       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.

EXAMPLES

       None.

APPLICATION USAGE

       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.

RATIONALE

       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.

FUTURE DIRECTIONS

       None.

SEE ALSO

       kill(), pthread_self(), raise()

       The Base Definitions volume of POSIX.1‐2008, <signal.h>

COPYRIGHT

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2013 Edition, Standard for Information Technology  --  Portable  Operating  System
       Interface  (POSIX),  The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc  and  The  Open  Group.   (This  is
       POSIX.1-2008  with  the  2013  Technical  Corrigendum  1  applied.)  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.unix.org/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 .