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_RISCOS
25
26 #include <stdio.h>
27 #include <time.h>
28 #include <sys/time.h>
29 #include <unistd.h>
30 #include <string.h>
31 #include <errno.h>
32
33 #include "SDL_timer.h"
34 #include "../SDL_timer_c.h"
35
36 #if SDL_THREADS_DISABLED
37 /* Timer SDL_arraysize(Timer ),start/reset time */
38 static Uint32 timerStart;
39 /* Timer running function */
40 void RISCOS_CheckTimer();
41 #else
42 #include <pthread.h>
43 extern Uint32 riscos_main_thread;
44 extern int riscos_using_threads;
45 extern Uint32 SDL_ThreadID();
46 extern Uint32 SDL_EventThreadID(void);
47 #endif
48
49
50 extern void RISCOS_BackgroundTasks(void);
51
52 /* The first ticks value of the application */
53 clock_t start;
54
SDL_StartTicks(void)55 void SDL_StartTicks(void)
56 {
57 /* Set first ticks value */
58 start = clock();
59 }
60
SDL_GetTicks(void)61 Uint32 SDL_GetTicks (void)
62 {
63 clock_t ticks;
64
65 ticks=clock()-start;
66
67
68 #if CLOCKS_PER_SEC == 1000
69
70 return(ticks);
71
72 #elif CLOCKS_PER_SEC == 100
73
74 return (ticks * 10);
75
76 #else
77
78 return ticks*(1000/CLOCKS_PER_SEC);
79
80 #endif
81
82 }
83
SDL_Delay(Uint32 ms)84 void SDL_Delay (Uint32 ms)
85 {
86 Uint32 now,then,elapsed;
87 #if !SDL_THREADS_DISABLED
88 int is_event_thread;
89 if (riscos_using_threads)
90 {
91 is_event_thread = 0;
92 if (SDL_EventThreadID())
93 {
94 if (SDL_EventThreadID() == SDL_ThreadID()) is_event_thread = 1;
95 } else if (SDL_ThreadID() == riscos_main_thread) is_event_thread = 1;
96 } else is_event_thread = 1;
97 #endif
98
99 /*TODO: Next version of Unixlib may allow us to use usleep here */
100 /* for non event threads */
101
102 /* Set the timeout interval - Linux only needs to do this once */
103 then = SDL_GetTicks();
104
105 do {
106 /* Do background tasks required while sleeping as we are not multithreaded */
107 #if SDL_THREADS_DISABLED
108 RISCOS_BackgroundTasks();
109 #else
110 /* For threaded build only run background tasks in event thread */
111 if (is_event_thread) RISCOS_BackgroundTasks();
112 #endif
113
114 /* Calculate the time interval left (in case of interrupt) */
115 now = SDL_GetTicks();
116 elapsed = (now-then);
117 then = now;
118 if ( elapsed >= ms ) {
119 break;
120 }
121 ms -= elapsed;
122 #if !SDL_THREADS_DISABLED
123 /* Need to yield to let other threads have a go */
124 if (riscos_using_threads) pthread_yield();
125 #endif
126
127 } while ( 1 );
128 }
129
130 #if SDL_THREADS_DISABLED
131
132 /* Non-threaded version of timer */
133
SDL_SYS_TimerInit(void)134 int SDL_SYS_TimerInit(void)
135 {
136 return(0);
137 }
138
SDL_SYS_TimerQuit(void)139 void SDL_SYS_TimerQuit(void)
140 {
141 SDL_SetTimer(0, NULL);
142 }
143
SDL_SYS_StartTimer(void)144 int SDL_SYS_StartTimer(void)
145 {
146 timerStart = SDL_GetTicks();
147
148 return(0);
149 }
150
SDL_SYS_StopTimer(void)151 void SDL_SYS_StopTimer(void)
152 {
153 /* Don't need to do anything as we use SDL_timer_running
154 to detect if we need to check the timer */
155 }
156
157
RISCOS_CheckTimer()158 void RISCOS_CheckTimer()
159 {
160 if (SDL_timer_running && SDL_GetTicks() - timerStart >= SDL_alarm_interval)
161 {
162 Uint32 ms;
163
164 ms = SDL_alarm_callback(SDL_alarm_interval);
165 if ( ms != SDL_alarm_interval )
166 {
167 if ( ms )
168 {
169 SDL_alarm_interval = ROUND_RESOLUTION(ms);
170 } else
171 {
172 SDL_alarm_interval = 0;
173 SDL_timer_running = 0;
174 }
175 }
176 if (SDL_alarm_interval) timerStart = SDL_GetTicks();
177 }
178 }
179
180 #else
181
182 /* Threaded version of timer - based on code for linux */
183
184 #include "SDL_thread.h"
185
186 /* Data to handle a single periodic alarm */
187 static int timer_alive = 0;
188 static SDL_Thread *timer = NULL;
189
RunTimer(void * unused)190 static int RunTimer(void *unused)
191 {
192 while ( timer_alive ) {
193 if ( SDL_timer_running ) {
194 SDL_ThreadedTimerCheck();
195 }
196 SDL_Delay(1);
197 }
198 return(0);
199 }
200
201 /* This is only called if the event thread is not running */
SDL_SYS_TimerInit(void)202 int SDL_SYS_TimerInit(void)
203 {
204 timer_alive = 1;
205 timer = SDL_CreateThread(RunTimer, NULL);
206 if ( timer == NULL )
207 return(-1);
208 return(SDL_SetTimerThreaded(1));
209 }
210
SDL_SYS_TimerQuit(void)211 void SDL_SYS_TimerQuit(void)
212 {
213 timer_alive = 0;
214 if ( timer ) {
215 SDL_WaitThread(timer, NULL);
216 timer = NULL;
217 }
218 }
219
SDL_SYS_StartTimer(void)220 int SDL_SYS_StartTimer(void)
221 {
222 SDL_SetError("Internal logic error: RISC OS uses threaded timer");
223 return(-1);
224 }
225
SDL_SYS_StopTimer(void)226 void SDL_SYS_StopTimer(void)
227 {
228 return;
229 }
230
231 #endif /* SDL_THREADS_DISABLED */
232
233 #endif /* SDL_TIMER_RISCOS */
234