pthread_kill(3) [plan9 man page]

PTHREAD_KILL(3) 					     Linux Programmer's Manual						   PTHREAD_KILL(3)

NAME

       pthread_kill - send a signal to a thread

SYNOPSIS

       #include <signal.h>

       int pthread_kill(pthread_t thread, int sig);

       Compile and link with -pthread.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       pthread_kill():
	   _POSIX_C_SOURCE >= 199506L || _XOPEN_SOURCE >= 500

DESCRIPTION

       The  pthread_kill()  function  sends  the  signal  sig to thread, a thread in the same process as the caller.  The signal is asynchronously
       directed to thread.

       If sig is 0, then no signal is sent, but error checking is still performed.

RETURN VALUE

       On success, pthread_kill() returns 0; on error, it returns an error number, and no signal is sent.

ERRORS

       EINVAL An invalid signal was specified.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +---------------+---------------+---------+
       |Interface      | Attribute     | Value	 |
       +---------------+---------------+---------+
       |pthread_kill() | Thread safety | MT-Safe |
       +---------------+---------------+---------+
CONFORMING TO

       POSIX.1-2001, POSIX.1-2008.

NOTES

       Signal dispositions are process-wide: if a signal handler is installed, the handler will be invoked in the thread thread, but if the dispo-
       sition 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 segmentation fault.

SEE ALSO

       kill(2), sigaction(2), sigpending(2), pthread_self(3), pthread_sigmask(3), raise(3), pthreads(7), signal(7)

COLOPHON

       This  page is part of release 4.15 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 https://www.kernel.org/doc/man-pages/.

Linux								    2017-09-15							   PTHREAD_KILL(3)

PTHREAD_KILL(3P)					     POSIX Programmer's Manual						  PTHREAD_KILL(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing 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:

       ESRCH  No thread could be found corresponding to that specified by the given thread ID.

       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  stop-
       ping) affects the process as a whole.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       kill(), pthread_self(), raise(), the Base Definitions volume of IEEE Std 1003.1-2001, <signal.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .

IEEE
/The Open Group						       2003							  PTHREAD_KILL(3P)