Subversion Repositories HelenOS

Rev

Rev 2678 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1435 palkovsky 1
/*
2071 jermar 2
 * Copyright (c) 2006 Ondrej Palkovsky
1435 palkovsky 3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1653 cejka 27
 */
28
 
1719 decky 29
/** @addtogroup libc
1653 cejka 30
 * @{
31
 */
32
/** @file
1435 palkovsky 33
 */
34
 
1449 palkovsky 35
#include <sys/time.h>
1435 palkovsky 36
#include <unistd.h>
37
#include <ipc/ipc.h>
38
#include <stdio.h>
39
#include <arch/barrier.h>
1452 palkovsky 40
#include <unistd.h>
41
#include <atomic.h>
42
#include <futex.h>
2015 jermar 43
#include <sysinfo.h>
1596 palkovsky 44
#include <ipc/services.h>
1435 palkovsky 45
 
46
#include <sysinfo.h>
47
#include <as.h>
48
#include <ddi.h>
49
 
3488 svoboda 50
#include <time.h>
51
 
1435 palkovsky 52
/* Pointers to public variables with time */
53
struct {
1439 palkovsky 54
    volatile sysarg_t seconds1;
1435 palkovsky 55
    volatile sysarg_t useconds;
1439 palkovsky 56
    volatile sysarg_t seconds2;
1435 palkovsky 57
} *ktime = NULL;
58
 
2486 jermar 59
/** Add microseconds to given timeval.
60
 *
61
 * @param tv        Destination timeval.
62
 * @param usecs     Number of microseconds to add.
63
 */
64
void tv_add(struct timeval *tv, suseconds_t usecs)
65
{
66
    tv->tv_sec += usecs / 1000000;
67
    tv->tv_usec += usecs % 1000000;
68
    if (tv->tv_usec > 1000000) {
69
        tv->tv_sec++;
70
        tv->tv_usec -= 1000000;
71
    }
72
}
1435 palkovsky 73
 
2486 jermar 74
/** Subtract two timevals.
75
 *
76
 * @param tv1       First timeval.
77
 * @param tv2       Second timeval.
78
 *
79
 * @return      Return difference between tv1 and tv2 (tv1 - tv2) in
80
 *          microseconds.
81
 */
82
suseconds_t tv_sub(struct timeval *tv1, struct timeval *tv2)
83
{
84
    suseconds_t result;
85
 
86
    result = tv1->tv_usec - tv2->tv_usec;
87
    result += (tv1->tv_sec - tv2->tv_sec) * 1000000;
88
 
89
    return result;
90
}
91
 
92
/** Decide if one timeval is greater than the other.
93
 *
94
 * @param t1        First timeval.
95
 * @param t2        Second timeval.
96
 *
97
 * @return      Return true tv1 is greater than tv2. Otherwise return
98
 *          false.
99
 */
100
int tv_gt(struct timeval *tv1, struct timeval *tv2)
101
{
102
    if (tv1->tv_sec > tv2->tv_sec)
103
        return 1;
104
    if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec > tv2->tv_usec)
105
        return 1;
106
    return 0;
107
}
108
 
109
/** Decide if one timeval is greater than or equal to the other.
110
 *
111
 * @param tv1       First timeval.
112
 * @param tv2       Second timeval.
113
 *
114
 * @return      Return true if tv1 is greater than or equal to tv2.
115
 *          Otherwise return false.
116
 */
117
int tv_gteq(struct timeval *tv1, struct timeval *tv2)
118
{
119
    if (tv1->tv_sec > tv2->tv_sec)
120
        return 1;
121
    if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec >= tv2->tv_usec)
122
        return 1;
123
    return 0;
124
}
125
 
126
 
1435 palkovsky 127
/** POSIX gettimeofday
128
 *
129
 * The time variables are memory mapped(RO) from kernel, which updates
130
 * them periodically. As it is impossible to read 2 values atomically, we
131
 * use a trick: First read a seconds, then read microseconds, then
1701 palkovsky 132
 * read seconds again. If a second elapsed in the meantime, set it to zero.
133
 * This provides assurance, that at least the
1435 palkovsky 134
 * sequence of subsequent gettimeofday calls is ordered.
135
 */
136
int gettimeofday(struct timeval *tv, struct timezone *tz)
137
{
138
    void *mapping;
1439 palkovsky 139
    sysarg_t s1, s2;
2677 jermar 140
    int rights;
1435 palkovsky 141
    int res;
142
 
143
    if (!ktime) {
2141 jermar 144
        mapping = as_get_mappable_page(PAGE_SIZE);
1435 palkovsky 145
        /* Get the mapping of kernel clock */
2678 jermar 146
        res = ipc_share_in_start_1_1(PHONE_NS, mapping, PAGE_SIZE,
2677 jermar 147
            SERVICE_MEM_REALTIME, &rights);
1435 palkovsky 148
        if (res) {
149
            printf("Failed to initialize timeofday memarea\n");
150
            _exit(1);
151
        }
2564 jermar 152
        if (!(rights & AS_AREA_READ)) {
1462 palkovsky 153
            printf("Received bad rights on time area: %X\n",
2564 jermar 154
                rights);
1501 palkovsky 155
            as_area_destroy(mapping);
1462 palkovsky 156
            _exit(1);
157
        }
1501 palkovsky 158
        ktime = mapping;
1435 palkovsky 159
    }
1441 palkovsky 160
    if (tz) {
161
        tz->tz_minuteswest = 0;
162
        tz->tz_dsttime = DST_NONE;
163
    }
164
 
1442 palkovsky 165
    s2 = ktime->seconds2;
166
    read_barrier();
1435 palkovsky 167
    tv->tv_usec = ktime->useconds;
168
    read_barrier();
1442 palkovsky 169
    s1 = ktime->seconds1;
1439 palkovsky 170
    if (s1 != s2) {
171
        tv->tv_usec = 0;
172
        tv->tv_sec = s1 > s2 ? s1 : s2;
173
    } else
174
        tv->tv_sec = s1;
1435 palkovsky 175
 
176
    return 0;
177
}
1452 palkovsky 178
 
2564 jermar 179
time_t time(time_t *tloc)
180
{
181
    struct timeval tv;
182
 
183
    if (gettimeofday(&tv, NULL))
184
        return (time_t) -1;
185
    if (tloc)
186
        *tloc = tv.tv_sec;
187
    return tv.tv_sec;
188
}
189
 
2188 decky 190
/** Wait unconditionally for specified number of microseconds */
2616 jermar 191
int usleep(unsigned long usec)
1452 palkovsky 192
{
193
    atomic_t futex = FUTEX_INITIALIZER;
194
 
2188 decky 195
    futex_initialize(&futex, 0);
1452 palkovsky 196
    futex_down_timeout(&futex, usec, 0);
2616 jermar 197
    return 0;
1452 palkovsky 198
}
1653 cejka 199
 
2188 decky 200
/** Wait unconditionally for specified number of seconds */
201
unsigned int sleep(unsigned int seconds)
202
{
203
    atomic_t futex = FUTEX_INITIALIZER;
204
 
205
    futex_initialize(&futex, 0);
206
 
207
    /* Sleep in 1000 second steps to support
208
       full argument range */
209
    while (seconds > 0) {
210
        unsigned int period = (seconds > 1000) ? 1000 : seconds;
211
 
212
        futex_down_timeout(&futex, period * 1000000, 0);
213
        seconds -= period;
214
    }
2616 jermar 215
    return 0;
2188 decky 216
}
217
 
1719 decky 218
/** @}
1653 cejka 219
 */