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root/cebix/BasiliskII/src/Unix/timer_unix.cpp
Revision: 1.6
Committed: 2000-02-21T20:04:18Z (24 years, 9 months ago) by cebix
Branch: MAIN
Changes since 1.5: +1 -4 lines
Log Message: 
- Unix: changed time zone handling (again)

File Contents

# User Rev Content
1 cebix 1.1 /*
2     * timer_unix.cpp - Time Manager emulation, Unix specific stuff
3     *
4     * Basilisk II (C) 1997-1999 Christian Bauer
5     *
6     * This program is free software; you can redistribute it and/or modify
7     * it under the terms of the GNU General Public License as published by
8     * the Free Software Foundation; either version 2 of the License, or
9     * (at your option) any later version.
10     *
11     * This program is distributed in the hope that it will be useful,
12     * but WITHOUT ANY WARRANTY; without even the implied warranty of
13     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14     * GNU General Public License for more details.
15     *
16     * You should have received a copy of the GNU General Public License
17     * along with this program; if not, write to the Free Software
18     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19     */
20    
21     #include "sysdeps.h"
22     #include "timer.h"
23    
24     #define DEBUG 0
25     #include "debug.h"
26    
27    
28     /*
29     * Return microseconds since boot (64 bit)
30     */
31    
32     void Microseconds(uint32 &hi, uint32 &lo)
33     {
34     D(bug("Microseconds\n"));
35     #ifdef HAVE_CLOCK_GETTIME
36     struct timespec t;
37     clock_gettime(CLOCK_REALTIME, &t);
38     uint64 tl = (uint64)t.tv_sec * 1000000 + t.tv_nsec / 1000;
39     #else
40     struct timeval t;
41     gettimeofday(&t, NULL);
42     uint64 tl = (uint64)t.tv_sec * 1000000 + t.tv_usec;
43     #endif
44     hi = tl >> 32;
45     lo = tl;
46     }
47    
48    
49     /*
50     * Return local date/time in Mac format (seconds since 1.1.1904)
51     */
52    
53     uint32 TimerDateTime(void)
54     {
55 cebix 1.3 time_t utc_now = time(NULL);
56     #if defined(__linux__) || defined(__SVR4)
57 cebix 1.6 time_t local_now = utc_now - timezone;
58 cebix 1.3 #elif defined(__FreeBSD__) || defined(__NetBSD__)
59     time_t local_now = utc_now + localtime(&utc_now)->tm_gmtoff;
60     #else
61     time_t local_now = utc_now;
62     #endif
63 cebix 1.1 return (uint32)local_now + TIME_OFFSET;
64     }
65    
66    
67     /*
68     * Get current time
69     */
70    
71     void timer_current_time(tm_time_t &t)
72     {
73     #ifdef HAVE_CLOCK_GETTIME
74     clock_gettime(CLOCK_REALTIME, &t);
75     #else
76     gettimeofday(&t, NULL);
77     #endif
78     }
79    
80    
81     /*
82     * Add times
83     */
84    
85     void timer_add_time(tm_time_t &res, tm_time_t a, tm_time_t b)
86     {
87     #ifdef HAVE_CLOCK_GETTIME
88     res.tv_sec = a.tv_sec + b.tv_sec;
89     res.tv_nsec = a.tv_nsec + b.tv_nsec;
90     if (res.tv_nsec >= 1000000000) {
91     res.tv_sec++;
92     res.tv_nsec -= 1000000000;
93     }
94     #else
95     res.tv_sec = a.tv_sec + b.tv_sec;
96     res.tv_usec = a.tv_usec + b.tv_usec;
97     if (res.tv_usec >= 1000000) {
98     res.tv_sec++;
99     res.tv_usec -= 1000000;
100     }
101     #endif
102     }
103    
104    
105     /*
106     * Subtract times
107     */
108    
109     void timer_sub_time(tm_time_t &res, tm_time_t a, tm_time_t b)
110     {
111     #ifdef HAVE_CLOCK_GETTIME
112     res.tv_sec = a.tv_sec - b.tv_sec;
113     res.tv_nsec = a.tv_nsec - b.tv_nsec;
114     if (res.tv_nsec < 0) {
115     res.tv_sec--;
116     res.tv_nsec += 1000000000;
117     }
118     #else
119     res.tv_sec = a.tv_sec - b.tv_sec;
120     res.tv_usec = a.tv_usec - b.tv_usec;
121     if (res.tv_usec < 0) {
122     res.tv_sec--;
123     res.tv_usec += 1000000;
124     }
125     #endif
126     }
127    
128    
129     /*
130     * Compare times (<0: a < b, =0: a = b, >0: a > b)
131     */
132    
133     int timer_cmp_time(tm_time_t a, tm_time_t b)
134     {
135     #ifdef HAVE_CLOCK_GETTIME
136     if (a.tv_sec == b.tv_sec)
137     return a.tv_nsec - b.tv_nsec;
138     else
139     return a.tv_sec - b.tv_sec;
140     #else
141     if (a.tv_sec == b.tv_sec)
142     return a.tv_usec - b.tv_usec;
143     else
144     return a.tv_sec - b.tv_sec;
145     #endif
146     }
147    
148    
149     /*
150     * Convert Mac time value (>0: microseconds, <0: microseconds) to tm_time_t
151     */
152    
153     void timer_mac2host_time(tm_time_t &res, int32 mactime)
154     {
155     #ifdef HAVE_CLOCK_GETTIME
156     if (mactime > 0) {
157     // Time in milliseconds
158     res.tv_sec = mactime / 1000;
159     res.tv_nsec = (mactime % 1000) * 1000000;
160     } else {
161     // Time in negative microseconds
162     res.tv_sec = -mactime / 1000000;
163     res.tv_nsec = (-mactime % 1000000) * 1000;
164     }
165     #else
166     if (mactime > 0) {
167     // Time in milliseconds
168     res.tv_sec = mactime / 1000;
169     res.tv_usec = (mactime % 1000) * 1000;
170     } else {
171     // Time in negative microseconds
172     res.tv_sec = -mactime / 1000000;
173     res.tv_usec = -mactime % 1000000;
174     }
175     #endif
176     }
177    
178    
179     /*
180     * Convert positive tm_time_t to Mac time value (>0: microseconds, <0: microseconds)
181     * A negative input value for hosttime results in a zero return value
182     * As long as the microseconds value fits in 32 bit, it must not be converted to milliseconds!
183     */
184    
185     int32 timer_host2mac_time(tm_time_t hosttime)
186     {
187     if (hosttime.tv_sec < 0)
188     return 0;
189     else {
190     #ifdef HAVE_CLOCK_GETTIME
191     uint64 t = (uint64)hosttime.tv_sec * 1000000 + hosttime.tv_nsec / 1000;
192     #else
193     uint64 t = (uint64)hosttime.tv_sec * 1000000 + hosttime.tv_usec;
194     #endif
195     if (t > 0x7fffffff)
196     return t / 1000; // Time in milliseconds
197     else
198     return -t; // Time in negative microseconds
199     }
200     }