P_SIGSUSPEND
if (q->p_flag & P_SIGSUSPEND)
ktrpsig(p, signum, sctx->sig_action, p->p_flag & P_SIGSUSPEND ?
if (p->p_flag & P_SIGSUSPEND) {
atomic_clearbits_int(&p->p_flag, P_SIGSUSPEND);
if (p->p_flag & P_SIGSUSPEND) {
atomic_clearbits_int(&p->p_flag, P_SIGSUSPEND);
atomic_setbits_int(&p->p_flag, P_SIGSUSPEND);