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.

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 │
       └───────────────────────────────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       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)