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
   Multithreading (see pthreads(7))
       The pthread_kill() function is thread-safe.

CONFORMING TO
       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 disposition of the  signal  is  "stop",  "con‐
       tinue", or "terminate", this action will affect the whole process.

       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  implementa‐
       tion 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 3.74 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 http://www.kernel.org/doc/man-pages/.



Linux                                       2014-05-13                            PTHREAD_KILL(3)