send signal to a thread in the same
tid, int sig,
function sends the signal given by sig to
tid, a thread in the same process as the caller.
thrkill() will only succeed if
tcb is either
NULL or the
address of the thread control block (TCB) of the target thread.
sig may be one of the signals specified in
sigaction(2) or it may be 0, in which case error checking is
performed but no signal is actually sent.
If tid is zero then the current thread is targeted.
Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
thrkill() will fail and no signal will be
- sig is not a valid signal number.
- The process doesn't have a thread with thread ID tid.
- tcb is not
NULLand not the TCB address of the thread with thread ID tid.
__get_tcb(2), kill(2), sigaction(2), pthread_kill(3), raise(3)
thrkill() function is specific to
OpenBSD and should not be used in portable
thrkill() system call appeared in