Function umtx_exec

freebsd/kern/kern_umtx.c:4531–4551

* exec() hook. * * Clear robust lists for all process' threads, not delaying the * cleanup to thread exit, since the relevant address space is * destroyed right now. */

 * destroyed right now.
 */
void
umtx_exec(struct proc *p)
{
	struct thread *td;

	KASSERT(p == curproc, ("need curproc"));
	KASSERT((p->p_flag & P_HADTHREADS) == 0 ||
	    (p->p_flag & P_STOPPED_SINGLE) != 0,
	    ("curproc must be single-threaded"));
	/*
	 * There is no need to lock the list as only this thread can be
	 * running.
	 */
	FOREACH_THREAD_IN_PROC(p, td) {
		KASSERT(td == curthread ||
		    ((td->td_flags & TDF_BOUNDARY) != 0 && TD_IS_SUSPENDED(td)),
		    ("running thread %p %p", p, td));
		umtx_thread_cleanup(td);
		td->td_rb_list = td->td_rbp_list = td->td_rb_inact = 0;
	}
}

/*
 * thread exit hook.