v7 man page for pthread_sigqueue

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)