PRI_KERNEL_RT
#define MAXPRI_KERNEL_RT (PRI_KERNEL_RT + NPRI_KERNEL_RT - 1)
error = threadpool_get(&pool2, PRI_KERNEL_RT);
threadpool_put(pool2, PRI_KERNEL_RT);
error = threadpool_percpu_get(&pcpu2, PRI_KERNEL_RT);
threadpool_percpu_put(pcpu2, PRI_KERNEL_RT);