PTHREAD_KILL(3) Library Functions Manual PTHREAD_KILL(3)

pthread_kill — send a signal to a specified thread

/* -lpthread */
#include <pthread.h>
#include <signal.h>

int
pthread_kill(pthread_t thread, int sig);

The () function sends a signal, specified by sig, to a thread, specified by thread. If sig is 0, error checking is performed, but no signal is actually sent.

If successful, pthread_kill() returns 0. Otherwise, an error number is returned.

pthread_kill() will fail if:

[]
thread is an invalid thread ID.
[]
sig is an invalid or unsupported signal number.

kill(2), pthread_self(3), raise(3)

pthread_kill() conforms to ISO/IEC 9945-1:1996 (“POSIX.1”)

OpenBSD 7.8 June 7, 2025 PTHREAD_KILL(3)