pthread_sigqueue(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

PTHREAD_SIGQUEUE(3)     Linux Programmer's Manual    PTHREAD_SIGQUEUE(3)

NAME         top

       pthread_sigqueue - queue a signal and data to a thread

SYNOPSIS         top

       #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         top

       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         top

       On success, pthread_sigqueue() returns 0; on error, it returns an
       error number.

ERRORS         top

       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         top

       The pthread_sigqueue() function first appeared in glibc 2.11.

ATTRIBUTES         top

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

       ┌──────────────────────────────────────┬───────────────┬─────────┐
       │Interface                             Attribute     Value   │
       ├──────────────────────────────────────┼───────────────┼─────────┤
       │pthread_sigqueue()                    │ Thread safety │ MT-Safe │
       └──────────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO         top

       This function is a GNU extension.

NOTES         top

       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         top

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

COLOPHON         top

       This page is part of release 5.13 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                          2021-03-22            PTHREAD_SIGQUEUE(3)

Pages that refer to this page: clone(2)rt_sigqueueinfo(2)sigqueue(3)nptl(7)pthreads(7)signal(7)system_data_types(7)