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PTHREAD_SIGQUEUE(3)        Linux Programmer's Manual       PTHREAD_SIGQUEUE(3)
NAME
       pthread_sigqueue - queue a signal and data to a thread
SYNOPSIS
       #include <signal.h>
       #include <pthread.h>
       int pthread_sigqueue(pthread_t thread, int sig,
                            const union sigval value);
       Compile and link with -pthread.
   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
       pthread_sigqueue(): _GNU_SOURCE
DESCRIPTION
       The pthread_sigqueue() function performs a similar task to sigqueue(3),
       but, rather than sending a signal to a process, it sends a signal to  a
       thread in the same process as the calling thread.
       The  thread  argument  is the ID of a thread in the same process as the
       caller.  The sig argument specifies the signal to be sent.   The  value
       argument  specifies  data  to accompany the signal; see sigqueue(3) for
       details.
RETURN VALUE
       On success, pthread_sigqueue() returns 0; on error, it returns an error
       number.
ERRORS
       EAGAIN The limit of signals which may be queued has been reached.  (See
              signal(7) for further information.)
       EINVAL sig was invalid.
       ENOSYS pthread_sigqueue() is not supported on this system.
       ESRCH  thread is not valid.
VERSIONS
       The pthread_sigqueue() function first appeared in glibc 2.11.
ATTRIBUTES
       For  an  explanation  of  the  terms  used   in   this   section,   see
       attributes(7).
       +-------------------+---------------+---------+
       |Interface          | Attribute     | Value   |
       +-------------------+---------------+---------+
       |pthread_sigqueue() | Thread safety | MT-Safe |
       +-------------------+---------------+---------+
CONFORMING TO
       This function is a GNU extension.
NOTES
       The  glibc implementation of pthread_sigqueue() 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.
SEE ALSO
       rt_tgsigqueueinfo(2),  sigaction(2),  pthread_sigmask(3),  sigqueue(3),
       sigwait(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_SIGQUEUE(3)