pthread_sigqueue man page on Gentoo

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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 <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.

CONFORMING TO
       This function is a GNU extension.

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

COLOPHON
       This  page  is  part of release 3.63 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux				  2012-08-19		   PTHREAD_SIGQUEUE(3)
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