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PTHREAD_KILL(3) Library Functions Manual PTHREAD_KILL(3)

send a signal to a specified thread

#include <pthread.h>
#include <signal.h>

pthread_kill(pthread_t thread, int sig);

The pthread_kill() 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”)
June 5, 2013 OpenBSD-current