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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.