Hi!
> Add functions that can be used for coalescing and splitting buffers
> that are smaller than PAGE_SIZE. These functions provide no method
> of determining where the boundaries of the smaller buffers are to
> be found - that is the caller's problem.
I don't get it; why do we need that support?
> +int hib_write_buffer(char *buffer, int buffer_size)
> +{
> + int bytes_left = buffer_size, result = 0;
> +
> + while (bytes_left) {
> + char *from = buffer + buffer_size - bytes_left;
> + char *to = hib_ppio_buffer + hib_ppio_buffer_posn;
> + int capacity = PAGE_SIZE - hib_ppio_buffer_posn;
> +
> + if (bytes_left <= capacity) {
> + memcpy(to, from, bytes_left);
> + hib_ppio_buffer_posn += bytes_left;
> + return 0;
> + }
> +
> + /* Complete this page and start a new one */
> + memcpy(to, from, capacity);
> + bytes_left -= capacity;
If this copy happens too often, it will slow stuff down...
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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