pthread_sigqueue(3)        Library Functions Manual        pthread_sigqueue(3)

NAME
       pthread_sigqueue - queue a signal and data to a thread

LIBRARY
       POSIX threads library (libpthread, -lpthread)

SYNOPSIS
       #include <signal.h>
       #include <pthread.h>

       int pthread_sigqueue(pthread_t thread, int sig,
                            const union sigval value);

   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.

ATTRIBUTES
       For an explanation of the terms used in this section, see
       attributes(7).

       +--------------------------------------------+---------------+---------+
       |Interface                                   | Attribute     | Value   |
       +--------------------------------------------+---------------+---------+
       |pthread_sigqueue ()                         | Thread safety | MT-Safe |
       +--------------------------------------------+---------------+---------+
VERSIONS
       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.

STANDARDS
       GNU.

HISTORY
       glibc 2.11.

SEE ALSO
       rt_tgsigqueueinfo(2), sigaction(2), pthread_sigmask(3), sigqueue(3),
       sigwait(3), pthreads(7), signal(7)

Linux man-pages 6.7               2023-10-31               pthread_sigqueue(3)