The Asynchronous DSP Packet Queue is accessed through a simple C API. Most of the API is identical on both the host CPU and DSP with the exception that queues can only be created on the CPU.

dspqueue_create(): Create a new queue. Queues can only be created on the host CPU.
dspqueue_close(): Close a queue
dspqueue_export(): Export a queue on the host CPU, creating a handle that be used with dspqueue_import() on the DSP.
dspqueue_import(): Import a queue for use on the DSP, using a handle returned from dspqueue_export() on the CPU.
dspqueue_write() / dspqueue_write_noblock(): Write a packet to a queue. Writes can either block if the queue is full or return an error (dspqueue_write_noblock()); blocking writes can optionally have a timeout.
dspqueue_read() / dspqueue_read_noblock(): Read a packet from a queue.
dspqueue_peek() / dspqueue_peek_noblock(): Retrieve information about the next packet without consuming it.
dspqueue_write_early_wakeup_noblock(): Write an early wakeup packet to the queue.
dspqueue_get_stat(): Retrieve queue statistics, including the number of packets queued and statistics about early wakeup.