Function thread_single_end

freebsd/kern/kern_thread.c:1558–1603

* End the single threading mode.. */

 * End the single threading mode..
 */
void
thread_single_end(struct proc *p, int mode)
{
	struct thread *td;
	int wakeup_swapper;

	KASSERT(mode == SINGLE_EXIT || mode == SINGLE_BOUNDARY ||
	    mode == SINGLE_ALLPROC || mode == SINGLE_NO_EXIT,
	    ("invalid mode %d", mode));
	PROC_LOCK_ASSERT(p, MA_OWNED);
	KASSERT((mode == SINGLE_ALLPROC && (p->p_flag & P_TOTAL_STOP) != 0) ||
	    (mode != SINGLE_ALLPROC && (p->p_flag & P_TOTAL_STOP) == 0),
	    ("mode %d does not match P_TOTAL_STOP", mode));
	KASSERT(mode == SINGLE_ALLPROC || p->p_singlethread == curthread,
	    ("thread_single_end from other thread %p %p",
	    curthread, p->p_singlethread));
	KASSERT(mode != SINGLE_BOUNDARY ||
	    (p->p_flag & P_SINGLE_BOUNDARY) != 0,
	    ("mis-matched SINGLE_BOUNDARY flags %x", p->p_flag));
	p->p_flag &= ~(P_STOPPED_SINGLE | P_SINGLE_EXIT | P_SINGLE_BOUNDARY |
	    P_TOTAL_STOP);
	PROC_SLOCK(p);
	p->p_singlethread = NULL;
	wakeup_swapper = 0;
	/*
	 * If there are other threads they may now run,
	 * unless of course there is a blanket 'stop order'
	 * on the process. The single threader must be allowed
	 * to continue however as this is a bad place to stop.
	 */
	if (p->p_numthreads != remain_for_mode(mode) && !P_SHOULDSTOP(p)) {
                FOREACH_THREAD_IN_PROC(p, td) {
			thread_lock(td);
			if (TD_IS_SUSPENDED(td)) {
				wakeup_swapper |= thread_unsuspend_one(td, p,
				    mode == SINGLE_BOUNDARY);
			} else
				thread_unlock(td);
		}
	}
	KASSERT(mode != SINGLE_BOUNDARY || p->p_boundary_count == 0,
	    ("inconsistent boundary count %d", p->p_boundary_count));
	PROC_SUNLOCK(p);
	if (wakeup_swapper)
		kick_proc0();
}

/*
 * Locate a thread by number and return with proc lock held.