data passing through callback function

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From: Changhee Han (changhee++at++ict.usc.edu)
Date: 06/01/2001 12:58:04

Hello all,
I want to know how to pass data to callback function, or to get value of
global variable from inside callback function.
I tried both
(1)
vgAddFunc( chan, VGCHAN_POSTDRAW, my_draw_callback, (void*)data_fd ); //this
function is now defined after vgConfigSys().
and
(2)
pfInit();
pfInitArenas();
new_fd_pt = (int *) pfMalloc(sizeof(int), pfGetSharedArena());;
.....
my_draw_callback(....){
......
printf(......new_fd_pt);
.......
}

But,
by(1), I got worng value.
by(2), I got below messages and wrong value
PF Warning/Usage: pfGetSharedArena() Must call pfInit or
pfInitArenas first.
=> warn pfInit() Already initialized. Must call pfExit() before
reinitialization.

PLEASE help me,
Thanks in advance,
changhee

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