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
This page is part of release 5.04 of the Linux 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/.
Referenced By
clone(2), nptl(7), pthreads(7), rt_sigqueueinfo(2), signal(7), sigqueue(3).