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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 per-
       formed.

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 at-
       tributes(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 disposi-
       tion 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_sig-
       mask(3), raise(3), pthreads(7), signal(7)

COLOPHON
       This  page  is  part of release 5.05 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)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON