PCN_SUSPENDED
pcnp->pcn_flags |= PCN_SUSPENDED;
pcnp->pcn_flags &= ~PCN_SUSPENDED;
pcnp->pcn_flags |= PCN_SUSPENDED;
if (pcnp->pcn_flags & PCN_SUSPENDED) {
#define IS_SUSPENDED(p) ((p)->pcn_flags & PCN_SUSPENDED)