1 /* Copyright (C) 2001-2003 artofcode LLC. All rights reserved.
2
3 This software is provided AS-IS with no warranty, either express or
4 implied.
5
6 This software is distributed under license and may not be copied,
7 modified or distributed except as expressly authorized under the terms
8 of the license contained in the file LICENSE in this distribution.
9
10 For more information about licensing, please refer to
11 http://www.ghostscript.com/licensing/. For information on
12 commercial licensing, go to http://www.artifex.com/licensing/ or
13 contact Artifex Software, Inc., 101 Lucas Valley Road #110,
14 San Rafael, CA 94903, U.S.A., +1(415)492-9861.
15 */
16
17 /* $Id: gp_macpoll.c,v 1.3 2004/12/09 00:59:59 giles Exp $ */
18 /*
19 * Macintosh platform polling support for Ghostscript.
20 *
21 */
22
23 #ifndef __CARBON__
24 #include <Timer.h>
25 #else
26 #include <Carbon.h>
27 #endif
28
29 #include "gx.h"
30 #include "gp.h"
31 #include "gsdll.h"
32 #include "gpcheck.h"
33 #include "iapi.h"
34 #include "iref.h"
35 #include "iminst.h"
36 #include "imain.h"
37
38 #ifdef CHECK_INTERRUPTS
39
40 extern HWND hwndtext;
41
42 /* ------ Process message loop ------ */
43 /*
44 * Check messages and interrupts; return true if interrupted.
45 * This is called frequently - it must be quick!
46 */
gp_check_interrupts(const gs_memory_t * mem)47 int gp_check_interrupts(const gs_memory_t *mem)
48 {
49 /* static variables need to go away for thread safety */
50 static unsigned long lastYieldTicks = 0;
51 int iRetVal = 0;
52
53 if ((TickCount() - lastYieldTicks) > 2) {
54 lastYieldTicks = TickCount();
55 if (pgsdll_callback) {
56 /* WARNING: The use of the old gsdll interface is deprecated.
57 * The caller should use the newer gsapi_set_poll.
58 * If the caller needs access to "hwndtext", it should do
59 * this via caller_handle which is passed to poll_fn.
60 */
61 /* the hwnd parameter which is submitted in gsdll_init
62 * to the DLL is returned in every gsdll_poll message
63 * in the count parameter
64 */
65 iRetVal = (*pgsdll_callback)(GSDLL_POLL, 0, (long) hwndtext);
66 } else {
67 if (mem == NULL) {
68 /* this is not thread safe */
69 mem = gs_lib_ctx_get_non_gc_memory_t();
70 }
71 if (mem && mem->gs_lib_ctx && mem->gs_lib_ctx->poll_fn)
72 iRetVal = (*mem->gs_lib_ctx->poll_fn)(mem->gs_lib_ctx->caller_handle);
73 }
74 }
75 return iRetVal;
76 }
77 #endif
78