e14743d1 |
1 | /* |
2 | SDL - Simple DirectMedia Layer |
3 | Copyright (C) 1997-2009 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_UNIX |
25 | |
26 | #include <stdio.h> |
27 | #include <sys/time.h> |
28 | #include <signal.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 | /* The clock_gettime provides monotonous time, so we should use it if |
37 | it's available. The clock_gettime function is behind ifdef |
38 | for __USE_POSIX199309 |
39 | Tommi Kyntola (tommi.kyntola@ray.fi) 27/09/2005 |
40 | */ |
41 | #if HAVE_NANOSLEEP || HAVE_CLOCK_GETTIME |
42 | #include <time.h> |
43 | #endif |
44 | |
45 | #if SDL_THREAD_PTH |
46 | #include <pth.h> |
47 | #endif |
48 | |
49 | #if SDL_THREADS_DISABLED |
50 | #define USE_ITIMER |
51 | #endif |
52 | |
53 | /* The first ticks value of the application */ |
54 | #ifdef HAVE_CLOCK_GETTIME |
55 | static struct timespec start; |
56 | #else |
57 | static struct timeval start; |
58 | #endif /* HAVE_CLOCK_GETTIME */ |
59 | |
60 | |
61 | void SDL_StartTicks(void) |
62 | { |
63 | /* Set first ticks value */ |
64 | #if HAVE_CLOCK_GETTIME |
65 | clock_gettime(CLOCK_MONOTONIC,&start); |
66 | #else |
67 | gettimeofday(&start, NULL); |
68 | #endif |
69 | } |
70 | |
71 | Uint32 SDL_GetTicks (void) |
72 | { |
73 | #if HAVE_CLOCK_GETTIME |
74 | Uint32 ticks; |
75 | struct timespec now; |
76 | clock_gettime(CLOCK_MONOTONIC,&now); |
77 | ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_nsec-start.tv_nsec)/1000000; |
78 | return(ticks); |
79 | #else |
80 | Uint32 ticks; |
81 | struct timeval now; |
82 | gettimeofday(&now, NULL); |
83 | ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000; |
84 | return(ticks); |
85 | #endif |
86 | } |
87 | |
88 | void SDL_Delay (Uint32 ms) |
89 | { |
90 | #if SDL_THREAD_PTH |
91 | pth_time_t tv; |
92 | tv.tv_sec = ms/1000; |
93 | tv.tv_usec = (ms%1000)*1000; |
94 | pth_nap(tv); |
95 | #else |
96 | int was_error; |
97 | |
98 | #if HAVE_NANOSLEEP |
99 | struct timespec elapsed, tv; |
100 | #else |
101 | struct timeval tv; |
102 | Uint32 then, now, elapsed; |
103 | #endif |
104 | |
105 | /* Set the timeout interval */ |
106 | #if HAVE_NANOSLEEP |
107 | elapsed.tv_sec = ms/1000; |
108 | elapsed.tv_nsec = (ms%1000)*1000000; |
109 | #else |
110 | then = SDL_GetTicks(); |
111 | #endif |
112 | do { |
113 | errno = 0; |
114 | |
115 | #if HAVE_NANOSLEEP |
116 | tv.tv_sec = elapsed.tv_sec; |
117 | tv.tv_nsec = elapsed.tv_nsec; |
118 | was_error = nanosleep(&tv, &elapsed); |
119 | #else |
120 | /* Calculate the time interval left (in case of interrupt) */ |
121 | now = SDL_GetTicks(); |
122 | elapsed = (now-then); |
123 | then = now; |
124 | if ( elapsed >= ms ) { |
125 | break; |
126 | } |
127 | ms -= elapsed; |
128 | tv.tv_sec = ms/1000; |
129 | tv.tv_usec = (ms%1000)*1000; |
130 | |
131 | was_error = select(0, NULL, NULL, NULL, &tv); |
132 | #endif /* HAVE_NANOSLEEP */ |
133 | } while ( was_error && (errno == EINTR) ); |
134 | #endif /* SDL_THREAD_PTH */ |
135 | } |
136 | |
137 | #ifdef USE_ITIMER |
138 | |
139 | static void HandleAlarm(int sig) |
140 | { |
141 | Uint32 ms; |
142 | |
143 | if ( SDL_alarm_callback ) { |
144 | ms = (*SDL_alarm_callback)(SDL_alarm_interval); |
145 | if ( ms != SDL_alarm_interval ) { |
146 | SDL_SetTimer(ms, SDL_alarm_callback); |
147 | } |
148 | } |
149 | } |
150 | |
151 | int SDL_SYS_TimerInit(void) |
152 | { |
153 | struct sigaction action; |
154 | |
155 | /* Set the alarm handler (Linux specific) */ |
156 | SDL_memset(&action, 0, sizeof(action)); |
157 | action.sa_handler = HandleAlarm; |
158 | action.sa_flags = SA_RESTART; |
159 | sigemptyset(&action.sa_mask); |
160 | sigaction(SIGALRM, &action, NULL); |
161 | return(0); |
162 | } |
163 | |
164 | void SDL_SYS_TimerQuit(void) |
165 | { |
166 | SDL_SetTimer(0, NULL); |
167 | } |
168 | |
169 | int SDL_SYS_StartTimer(void) |
170 | { |
171 | struct itimerval timer; |
172 | |
173 | timer.it_value.tv_sec = (SDL_alarm_interval/1000); |
174 | timer.it_value.tv_usec = (SDL_alarm_interval%1000)*1000; |
175 | timer.it_interval.tv_sec = (SDL_alarm_interval/1000); |
176 | timer.it_interval.tv_usec = (SDL_alarm_interval%1000)*1000; |
177 | setitimer(ITIMER_REAL, &timer, NULL); |
178 | return(0); |
179 | } |
180 | |
181 | void SDL_SYS_StopTimer(void) |
182 | { |
183 | struct itimerval timer; |
184 | |
185 | SDL_memset(&timer, 0, (sizeof timer)); |
186 | setitimer(ITIMER_REAL, &timer, NULL); |
187 | } |
188 | |
189 | #else /* USE_ITIMER */ |
190 | |
191 | #include "SDL_thread.h" |
192 | |
193 | /* Data to handle a single periodic alarm */ |
194 | static int timer_alive = 0; |
195 | static SDL_Thread *timer = NULL; |
196 | |
197 | static int RunTimer(void *unused) |
198 | { |
199 | while ( timer_alive ) { |
200 | if ( SDL_timer_running ) { |
201 | SDL_ThreadedTimerCheck(); |
202 | } |
203 | SDL_Delay(1); |
204 | } |
205 | return(0); |
206 | } |
207 | |
208 | /* This is only called if the event thread is not running */ |
209 | int SDL_SYS_TimerInit(void) |
210 | { |
211 | timer_alive = 1; |
212 | timer = SDL_CreateThread(RunTimer, NULL); |
213 | if ( timer == NULL ) |
214 | return(-1); |
215 | return(SDL_SetTimerThreaded(1)); |
216 | } |
217 | |
218 | void SDL_SYS_TimerQuit(void) |
219 | { |
220 | timer_alive = 0; |
221 | if ( timer ) { |
222 | SDL_WaitThread(timer, NULL); |
223 | timer = NULL; |
224 | } |
225 | } |
226 | |
227 | int SDL_SYS_StartTimer(void) |
228 | { |
229 | SDL_SetError("Internal logic error: Linux uses threaded timer"); |
230 | return(-1); |
231 | } |
232 | |
233 | void SDL_SYS_StopTimer(void) |
234 | { |
235 | return; |
236 | } |
237 | |
238 | #endif /* USE_ITIMER */ |
239 | |
240 | #endif /* SDL_TIMER_UNIX */ |