pthread_kill(3) — Linux manual page


pthread_kill(3)         Library Functions Manual         pthread_kill(3)

NAME         top

       pthread_kill - send a signal to a thread

LIBRARY         top

       POSIX threads library (libpthread, -lpthread)

SYNOPSIS         top

       #include <signal.h>

       int pthread_kill(pthread_t thread, int sig);

   Feature Test Macro Requirements for glibc (see

           _POSIX_C_SOURCE >= 199506L || _XOPEN_SOURCE >= 500

DESCRIPTION         top

       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

RETURN VALUE         top

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

ERRORS         top

       EINVAL An invalid signal was specified.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       │ Interface                           Attribute     Value   │
       │ pthread_kill()                      │ Thread safety │ MT-Safe │

VERSIONS         top

       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

       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.

STANDARDS         top


HISTORY         top


NOTES         top

       Signal dispositions are process-wide: if a signal handler is
       installed, the handler will be invoked in the thread thread, but
       if the disposition of the signal is "stop", "continue", or
       "terminate", this action will affect the whole process.

SEE ALSO         top

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

COLOPHON         top

       This page is part of the man-pages (Linux kernel and C library
       user-space interface documentation) project.  Information about
       the project can be found at 
       ⟨⟩.  If you have a bug report
       for this manual page, see
       This page was obtained from the tarball man-pages-6.9.1.tar.gz
       fetched from
       ⟨⟩ on
       2024-06-26.  If you discover any rendering problems in this HTML
       version of the page, or you believe there is a better or more up-
       to-date source for the page, or you have corrections or
       improvements to the information in this COLOPHON (which is not
       part of the original manual page), send a mail to

Linux man-pages 6.9.1          2024-05-02                pthread_kill(3)

Pages that refer to this page: pthread_sigmask(3)raise(3)nptl(7)pthreads(7)signal(7)signal-safety(7)