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.TH PTHREAD_SIGQUEUE 3 2017-09-15 "Linux" "Linux Programmer's Manual"

.SH NAME

pthread_sigqueue \- queue a signal and data to a thread

.SH SYNOPSIS

.nf

.B #include <signal.h>

.B #include <pthread.h>

.PP

.BI "int pthread_sigqueue(pthread_t " thread ", int " sig ,

.BI "                     const union sigval " value );

.fi

.PP

Compile and link with \fI\-pthread\fP.

.PP

.in -4n

Feature Test Macro Requirements for glibc (see

.BR feature_test_macros (7)):

.in

.PP

.BR pthread_sigqueue ():

_GNU_SOURCE

.SH DESCRIPTION

The

.BR pthread_sigqueue ()

function performs a similar task to

.BR 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.

.PP

The

.I thread

argument is the ID of a thread in the same process as the caller.

The

.I sig

argument specifies the signal to be sent.

The

.I value

argument specifies data to accompany the signal; see

.BR sigqueue (3)

for details.

.SH RETURN VALUE

On success,

.BR pthread_sigqueue ()

returns 0;

on error, it returns an error number.

.SH ERRORS

.TP

.B EAGAIN

The limit of signals which may be queued has been reached.

(See

.BR signal (7)

for further information.)

.TP

.B EINVAL

.I sig

was invalid.

.TP

.B ENOSYS

.BR pthread_sigqueue ()

is not supported on this system.

.TP

.B ESRCH

.I thread

is not valid.

.SH VERSIONS

The

.BR pthread_sigqueue ()

function first appeared in glibc 2.11.

.SH ATTRIBUTES

For an explanation of the terms used in this section, see

.BR attributes (7).

.TS

allbox;

lb lb lb

l l l.

Interface	Attribute	Value

T{

.BR pthread_sigqueue ()

T}	Thread safety	MT-Safe

.TE

.SH CONFORMING TO

This function is a GNU extension.

.SH NOTES

The glibc implementation of

.BR pthread_sigqueue ()

gives an error

.RB ( EINVAL )

on attempts to send either of the real-time signals

used internally by the NPTL threading implementation.

See

.BR nptl (7)

for details.

.SH SEE ALSO

.BR rt_tgsigqueueinfo (2),

.BR sigaction (2),

.BR pthread_sigmask (3),

.BR sigqueue (3),

.BR sigwait (3),

.BR pthreads (7),

.BR signal (7)

.SH COLOPHON

This page is part of release 4.15 of the Linux

.I 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/.