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

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