display-mansync

Section: GGI (7)
Updated: 2004-06-05
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NAME

display-mansync : sync mode emulation

SYNOPIS

display-mansync

DESCRIPTION

Helper library for the implementation of SYNC mode on targets which are inherently ASYNC (e.g. X) and require manual flushes of the framebuffer.

A target wishing to use mansync should open mansync with _ggiAddDL() in it's own GGIopen(). It must pass a pointer to a _ggi_opmansync structure as the argument to _ggiAddDL(), and must define the following macros:

MANSYNC_init(vis)
MANSYNC_deinit(vis)
MANSYNC_start(vis)
MANSYNC_stop(vis)
MANSYNC_ignore(vis)
MANSYNC_cont(vis)

which is supposed to call the functions in _ggi_opmansync respectively.

Mansync provides the following functions:

int _GGI_mansync_init(vis);
int _GGI_mansync_deinit(vis);
      Initialize/deinitialize mansync for given visual.

int _GGI_mansync_start(vis);
int _GGI_mansync_stop(vis);
      Start/stop mansync handling. (process,thread,etc.)
      You don't need to explicitly call these;
      MANSYNC_SETFLAGS does it for you.

int _GGI_mansync_ignore(vis);
int _GGI_mansync_cont(vis);
      Temporarily start/stop mansync, e.g. during mode set.
      It is o.k. to use them even if mansync has not been started.

MANSYNC_SETFLAGS(vis,flags)
      mansync management in ggiSetFlags().

(The above functions return 0 if successful, -1 if not.)

Please see display/X, display/aa or display/tile to see how mansync is used. The functions should be transparent enough.

: Important: You're responsible for locking your own visual, not mansync!

ENVIRONMENT VARIABLES

GGI_MANSYNC_FPS: This variable specifies the framerate for targets emulating synchronous mode. The default is 20fps. If you are experiencing problems with the X target over relatively slow remote connections it might be due to connection overload. You might want to try with a lower GGI_MANSYNC_FPS setting.