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)