54 lines
2.2 KiB
C
54 lines
2.2 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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/* */
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/* Damien Doligez, projet Para, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* en Automatique. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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#ifndef _rotatecursor_
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#define _rotatecursor_
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/* [rotatecursor_flag] will be automagically set to 1 when the time comes
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to call [rotatecursor_action].
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*/
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extern int volatile rotatecursor_flag;
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/* Use [rotatecursor_options] to set advanced parameters:
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1. [p1] is a pointer to another variable that will be set to 1 when
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the time is up, unless it is already nonzero. Typical use is when
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you already have a variable in your program that is set
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asynchronously for something else, and you want to avoid testing
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two different variables in your inner loop. Pass NULL if you don't
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need this feature.
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2. [period] is the interval (in milliseconds) between calls to
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RotateCursor. Reasonable values are between 10 and 200;
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the default is 50.
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*/
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void rotatecursor_options (int volatile *p1, int period);
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/* [reverse] is 0 to rotate the cursor clockwise, anything else to
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rotate counterclockwise. This function resets [rotatecursor_flag]
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to 0.
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This function always returns 0. It returns an int so you can use
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it in an expression as well as a statement. Useful for some macros.
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*/
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int rotatecursor_action (int reverse);
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/* Simple interface to [rotatecursor_flag] and [rotatecursor_action].
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Can be used as a statement (followed by a semicolon) or in an
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expression (followed by a comma).
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*/
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#define ROTATECURSOR_MAGIC() (rotatecursor_flag ? rotatecursor_action (0) : 0)
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#endif /* _rotatecursor_ */
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