06-30-2011
Thanks for your explanation Corona.
I would like add few things about the context where the code is found. This acutaly found inside the marco current, which will hold the process descriptor being accessed by the process running on a particular CPU.
the process desccriptor pointer is stored in one end of the kernel stack which usually of 8192 bytes.
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LEARN ABOUT DEBIAN
request_scroll
request_scroll(3alleg4) Allegro manual request_scroll(3alleg4)
NAME
request_scroll - Queues a hardware scroll request with triple buffering. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
int request_scroll(int x, int y);
DESCRIPTION
This function is used for triple buffering. It requests a hardware scroll to the specified position, but returns immediately rather than
waiting for a retrace. The scroll will then take place during the next vertical retrace, but you can carry on running other code in the
meantime and use the poll_scroll() routine to detect when the flip has actually taken place.
Triple buffering is only possible with certain drivers: you can look at the GFX_CAN_TRIPLE_BUFFER bit in the gfx_capabilities flag to see
if it will work with the current driver.
RETURN VALUE
This function returns zero on success, non-zero otherwise.
SEE ALSO
poll_scroll(3alleg4), request_video_bitmap(3alleg4), gfx_capabilities(3alleg4), scroll_screen(3alleg4)
Allegro version 4.4.2 request_scroll(3alleg4)