src/timer/beos/SDL_systimer.c
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FUNCTIONS
This source file includes following functions.
- SDL_StartTicks
- SDL_GetTicks
- SDL_Delay
- RunTimer
- SDL_SYS_TimerInit
- SDL_SYS_TimerQuit
- SDL_SYS_StartTimer
- SDL_SYS_StopTimer
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 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 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with this library; if not, write to the Free
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 Sam Lantinga
20 slouken@devolution.com
21 */
22
23 #ifdef SAVE_RCSID
24 static char rcsid =
25 "@(#) $Id: SDL_systimer.c,v 1.1.2.4 2001/02/10 07:20:05 hercules Exp $";
26 #endif
27
28 #include <be/kernel/OS.h>
29
30 #include "SDL_thread.h"
31 #include "SDL_timer.h"
32 #include "SDL_error.h"
33 #include "SDL_timer_c.h"
34
35 static bigtime_t start;
36
37 void SDL_StartTicks(void)
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38 {
39 /* Set first ticks value */
40 start = system_time();
41 }
42
43 Uint32 SDL_GetTicks(void)
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44 {
45 return((system_time()-start)/1000);
46 }
47
48 void SDL_Delay(Uint32 ms)
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49 {
50 snooze(ms*1000);
51 }
52
53 /* Data to handle a single periodic alarm */
54 static int timer_alive = 0;
55 static SDL_Thread *timer = NULL;
56
57 static int RunTimer(void *unused)
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58 {
59 while ( timer_alive ) {
60 if ( SDL_timer_running ) {
61 SDL_ThreadedTimerCheck();
62 }
63 SDL_Delay(10);
64 }
65 return(0);
66 }
67
68 /* This is only called if the event thread is not running */
69 int SDL_SYS_TimerInit(void)
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70 {
71 timer_alive = 1;
72 timer = SDL_CreateThread(RunTimer, NULL);
73 if ( timer == NULL )
74 return(-1);
75 return(SDL_SetTimerThreaded(1));
76 }
77
78 void SDL_SYS_TimerQuit(void)
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79 {
80 timer_alive = 0;
81 if ( timer ) {
82 SDL_WaitThread(timer, NULL);
83 timer = NULL;
84 }
85 }
86
87 int SDL_SYS_StartTimer(void)
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88 {
89 SDL_SetError("Internal logic error: BeOS uses threaded timer");
90 return(-1);
91 }
92
93 void SDL_SYS_StopTimer(void)
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94 {
95 return;
96 }