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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.
SEE ALSO
rt_tgsigqueueinfo(2), sigaction(2), pthread_sigmask(3), sigqueue(3), sigwait(3), pthreads(7), signal(7)
Linux 2021-03-22 PTHREAD_SIGQUEUE(3)