Consumer priority setting

[Emreiris]

Hello, I want to put a backup consumer to the main consumer to cover the case the main consumer goes down. I have given priority as
` amqp_table_t args;
#if 1
amqp_table_entry_t entry = {
.key = amqp_cstring_bytes("x-priority"),
.value = {.kind = AMQP_FIELD_KIND_I32, .value = m_priority}};

args.entries = &entry;
args.num_entries = 1;
#endif

amqp_basic_consume(conn, 1, queuename, amqp_empty_bytes, 0, 1, 0,
amqp_empty_table);`
m_priority is a number between 1 and 10. But It seems no effect on consuming messages from the queue. How can I give priority to consumers?