linuxaudio.org

On Sat, Oct 18, 2008 at 10:56:31PM +0200, Paul Davis wrote:
> if read_ptr > size then the math should result in the write space being

quoted text
> *under* estimated. if thats not happening then my worst nightmares come

> true, which has happened before. is there a signed/unsigned issue going

> on here?

The only way to know is to verify all the possible cases in

jack_ringbuffer_write_space() and jack_ringbuffer_read_space(),

taking into account that the masking operation may not have

been applied at the time these are called, and that 'the other'

*_ptr could be >= size.
Note that this is *much* simpler in the C++ class that

I poster earlier - there are no conditions at all in

write_avail() or read_avail(). The essential difference

is that I don't mask the stored values of _nrd and _nwr

(the equivalents of read_ptr and write_ptr). This also

removes the ambiguity between an empty and full buffer.

The downside is that it depends on the user code acting

in the correct way (which seems reasonable).
Ciao,
--

FA
Laboratorio di Acustica ed Elettroacustica

Parma, Italia
Lascia la spina, cogli la rosa.
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