Re: [Qemu-devel] [RFC] Factor out fifos / circular buffers

[Igor Mitsyanko]

On 07/31/2012 02:20 PM, Peter Crosthwaite wrote:
> Hi All,
>
> A lot of devices have little internal fifos that are often implemented
> as circular buffers in the device state. Any reason to not factor that
> out into a helper module? Was thinkin just a struct defintion
> containing the key elements (the uint8_t *data buffer, head/tail
> pointers, capacity). and helper functions to create/destroy, put/get,
> test for full/empty etc. And VMSD support - which will make devices a
> lot cleaner if theres just one VM_STATE_FIFO instead of all these
> little bits of implementation detail in the device state.
>
> Regards,
> Peter

Just yesterday I thought, why there is no builtin FIFO api in QEMU?

I think majority of device models use fifos with length which is a power 
of 2, I think that's the way to go for these helpers at first.