1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2006 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19 Sam Lantinga
20 slouken@libsdl.org
21 */
22 #include "SDL_config.h"
23
24 #ifdef SDL_TIMER_DC
25
26 #include <kos.h>
27
28 #include "SDL_thread.h"
29 #include "SDL_timer.h"
30 #include "../SDL_timer_c.h"
31
32 static unsigned start;
33
34 /*
35 jif = ms * HZ /1000
36 ms = jif * 1000/HZ
37 */
38
SDL_StartTicks(void)39 void SDL_StartTicks(void)
40 {
41 /* Set first ticks value */
42 start = jiffies;
43 }
44
SDL_GetTicks(void)45 Uint32 SDL_GetTicks(void)
46 {
47 return((jiffies-start)*1000/HZ);
48 }
49
SDL_Delay(Uint32 ms)50 void SDL_Delay(Uint32 ms)
51 {
52 thd_sleep(ms);
53 }
54
55 /* Data to handle a single periodic alarm */
56 static int timer_alive = 0;
57 static SDL_Thread *timer = NULL;
58
RunTimer(void * unused)59 static int RunTimer(void *unused)
60 {
61 while ( timer_alive ) {
62 if ( SDL_timer_running ) {
63 SDL_ThreadedTimerCheck();
64 }
65 SDL_Delay(10);
66 }
67 return(0);
68 }
69
70 /* This is only called if the event thread is not running */
SDL_SYS_TimerInit(void)71 int SDL_SYS_TimerInit(void)
72 {
73 timer_alive = 1;
74 timer = SDL_CreateThread(RunTimer, NULL);
75 if ( timer == NULL )
76 return(-1);
77 return(SDL_SetTimerThreaded(1));
78 }
79
SDL_SYS_TimerQuit(void)80 void SDL_SYS_TimerQuit(void)
81 {
82 timer_alive = 0;
83 if ( timer ) {
84 SDL_WaitThread(timer, NULL);
85 timer = NULL;
86 }
87 }
88
SDL_SYS_StartTimer(void)89 int SDL_SYS_StartTimer(void)
90 {
91 SDL_SetError("Internal logic error: DC uses threaded timer");
92 return(-1);
93 }
94
SDL_SYS_StopTimer(void)95 void SDL_SYS_StopTimer(void)
96 {
97 return;
98 }
99
100 #endif /* SDL_TIMER_DC */
101