pthread_sigqueue man page
pthread_sigqueue — queue a signal and data to a thread
#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)):
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.
On success, pthread_sigqueue() returns 0; on error, it returns an error number.
The limit of signals which may be queued has been reached. (See signal(7) for further information.)
sig was invalid.
pthread_sigqueue() is not supported on this system.
thread is not valid.
The pthread_sigqueue() function first appeared in glibc 2.11.
For an explanation of the terms used in this section, see attributes(7).
This function is a GNU extension.
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.
rt_tgsigqueueinfo(2), sigaction(2), pthread_sigmask(3), sigqueue(3), sigwait(3), pthreads(7), signal(7)
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nptl(7), pthreads(7), rt_sigqueueinfo(2), signal(7), sigqueue(3).