1MEMBARRIER_CMD_QUERY 0 2MEMBARRIER_CMD_GLOBAL 1 << 0 3MEMBARRIER_CMD_GLOBAL_EXPEDITED 1 << 1 4MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED 1 << 2 5MEMBARRIER_CMD_PRIVATE_EXPEDITED 1 << 3 6MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED 1 << 4 7MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE 1 << 5 8MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE 1 << 6 9