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comparison src/timer/amigaos/SDL_systimer.c @ 0:74212992fb08

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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
parents
children 75a95f82bc1f
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-1:000000000000 0:74212992fb08
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 "@(#) $Id$";
26 #endif
27
28 #include <stdio.h>
29 #include <sys/time.h>
30 #include <signal.h>
31 #include <unistd.h>
32 #include <string.h>
33 #include <errno.h>
34
35 #include "SDL_error.h"
36 #include "SDL_timer.h"
37 #include "SDL_timer_c.h"
38
39 /* The first ticks value of the application */
40 static struct timeval start;
41
42 void SDL_StartTicks(void)
43 {
44 /* Set first ticks value */
45 gettimeofday(&start, NULL);
46 }
47
48 Uint32 SDL_GetTicks (void)
49 {
50 struct timeval now;
51 Uint32 ticks;
52
53 gettimeofday(&now, NULL);
54 ticks=(now.tv_sec-start.tv_sec)*1000+(now.tv_usec-start.tv_usec)/1000;
55 return(ticks);
56 }
57
58 void SDL_Delay (Uint32 ms)
59 {
60 int was_error;
61 #ifndef linux /* Non-Linux implementations need to calculate time left */
62 Uint32 then, now, elapsed;
63 #endif
64 struct timeval tv;
65
66 /* Set the timeout interval - Linux only needs to do this once */
67 #ifdef linux
68 tv.tv_sec = ms/1000;
69 tv.tv_usec = (ms%1000)*1000;
70 #else
71 then = SDL_GetTicks();
72 #endif
73 do {
74 errno = 0;
75 #ifndef linux
76 /* Calculate the time interval left (in case of interrupt) */
77 now = SDL_GetTicks();
78 elapsed = (now-then);
79 then = now;
80 if ( elapsed >= ms ) {
81 break;
82 }
83 ms -= elapsed;
84 tv.tv_sec = ms/1000;
85 tv.tv_usec = (ms%1000)*1000;
86 #endif
87 was_error = select(0, NULL, NULL, NULL, &tv);
88 } while ( was_error && (errno == EINTR) );
89 }
90
91 #include "SDL_thread.h"
92
93 /* Data to handle a single periodic alarm */
94 static int timer_alive = 0;
95 static SDL_Thread *timer = NULL;
96
97 static int RunTimer(void *unused)
98 {
99 while ( timer_alive ) {
100 if ( SDL_timer_running ) {
101 SDL_ThreadedTimerCheck();
102 }
103 SDL_Delay(1);
104 }
105 return(0);
106 }
107
108 /* This is only called if the event thread is not running */
109 int SDL_SYS_TimerInit(void)
110 {
111 #ifdef NO_AMIGADEBUG
112 fprintf(stderr,"Creo il thread per il timer (NOITMER)...\n");
113 #endif
114 timer_alive = 1;
115 timer = SDL_CreateThread(RunTimer, NULL);
116 if ( timer == NULL )
117 {
118 #ifdef NO_AMIGADEBUG
119 fprintf(stderr,"Creazione del thread fallita...\n");
120 #endif
121
122 return(-1);
123 }
124 return(SDL_SetTimerThreaded(1));
125 }
126
127 void SDL_SYS_TimerQuit(void)
128 {
129 timer_alive = 0;
130 if ( timer ) {
131 SDL_WaitThread(timer, NULL);
132 timer = NULL;
133 }
134 }
135
136 int SDL_SYS_StartTimer(void)
137 {
138 SDL_SetError("Internal logic error: Linux uses threaded timer");
139 return(-1);
140 }
141
142 void SDL_SYS_StopTimer(void)
143 {
144 return;
145 }