Subversion Repositories HelenOS

Rev

Rev 2564 | Rev 2616 | Go to most recent revision | 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
 
50
/* Pointers to public variables with time */
51
struct {
1439 palkovsky 52
    volatile sysarg_t seconds1;
1435 palkovsky 53
    volatile sysarg_t useconds;
1439 palkovsky 54
    volatile sysarg_t seconds2;
1435 palkovsky 55
} *ktime = NULL;
56
 
2486 jermar 57
/** Add microseconds to given timeval.
58
 *
59
 * @param tv        Destination timeval.
60
 * @param usecs     Number of microseconds to add.
61
 */
62
void tv_add(struct timeval *tv, suseconds_t usecs)
63
{
64
    tv->tv_sec += usecs / 1000000;
65
    tv->tv_usec += usecs % 1000000;
66
    if (tv->tv_usec > 1000000) {
67
        tv->tv_sec++;
68
        tv->tv_usec -= 1000000;
69
    }
70
}
1435 palkovsky 71
 
2486 jermar 72
/** Subtract two timevals.
73
 *
74
 * @param tv1       First timeval.
75
 * @param tv2       Second timeval.
76
 *
77
 * @return      Return difference between tv1 and tv2 (tv1 - tv2) in
78
 *          microseconds.
79
 */
80
suseconds_t tv_sub(struct timeval *tv1, struct timeval *tv2)
81
{
82
    suseconds_t result;
83
 
84
    result = tv1->tv_usec - tv2->tv_usec;
85
    result += (tv1->tv_sec - tv2->tv_sec) * 1000000;
86
 
87
    return result;
88
}
89
 
90
/** Decide if one timeval is greater than the other.
91
 *
92
 * @param t1        First timeval.
93
 * @param t2        Second timeval.
94
 *
95
 * @return      Return true tv1 is greater than tv2. Otherwise return
96
 *          false.
97
 */
98
int tv_gt(struct timeval *tv1, struct timeval *tv2)
99
{
100
    if (tv1->tv_sec > tv2->tv_sec)
101
        return 1;
102
    if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec > tv2->tv_usec)
103
        return 1;
104
    return 0;
105
}
106
 
107
/** Decide if one timeval is greater than or equal to the other.
108
 *
109
 * @param tv1       First timeval.
110
 * @param tv2       Second timeval.
111
 *
112
 * @return      Return true if tv1 is greater than or equal to tv2.
113
 *          Otherwise return false.
114
 */
115
int tv_gteq(struct timeval *tv1, struct timeval *tv2)
116
{
117
    if (tv1->tv_sec > tv2->tv_sec)
118
        return 1;
119
    if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec >= tv2->tv_usec)
120
        return 1;
121
    return 0;
122
}
123
 
124
 
1435 palkovsky 125
/** POSIX gettimeofday
126
 *
127
 * The time variables are memory mapped(RO) from kernel, which updates
128
 * them periodically. As it is impossible to read 2 values atomically, we
129
 * use a trick: First read a seconds, then read microseconds, then
1701 palkovsky 130
 * read seconds again. If a second elapsed in the meantime, set it to zero.
131
 * This provides assurance, that at least the
1435 palkovsky 132
 * sequence of subsequent gettimeofday calls is ordered.
133
 */
134
int gettimeofday(struct timeval *tv, struct timezone *tz)
135
{
136
    void *mapping;
1439 palkovsky 137
    sysarg_t s1, s2;
1462 palkovsky 138
    sysarg_t rights;
1435 palkovsky 139
    int res;
140
 
141
    if (!ktime) {
2141 jermar 142
        mapping = as_get_mappable_page(PAGE_SIZE);
1435 palkovsky 143
        /* Get the mapping of kernel clock */
2615 jermar 144
        res = ipc_call_sync_3_2(PHONE_NS, IPC_M_AS_AREA_RECV,
2141 jermar 145
            (sysarg_t) mapping, PAGE_SIZE, SERVICE_MEM_REALTIME, NULL,
2615 jermar 146
            &rights);
1435 palkovsky 147
        if (res) {
148
            printf("Failed to initialize timeofday memarea\n");
149
            _exit(1);
150
        }
2564 jermar 151
        if (!(rights & AS_AREA_READ)) {
1462 palkovsky 152
            printf("Received bad rights on time area: %X\n",
2564 jermar 153
                rights);
1501 palkovsky 154
            as_area_destroy(mapping);
1462 palkovsky 155
            _exit(1);
156
        }
1501 palkovsky 157
        ktime = mapping;
1435 palkovsky 158
    }
1441 palkovsky 159
    if (tz) {
160
        tz->tz_minuteswest = 0;
161
        tz->tz_dsttime = DST_NONE;
162
    }
163
 
1442 palkovsky 164
    s2 = ktime->seconds2;
165
    read_barrier();
1435 palkovsky 166
    tv->tv_usec = ktime->useconds;
167
    read_barrier();
1442 palkovsky 168
    s1 = ktime->seconds1;
1439 palkovsky 169
    if (s1 != s2) {
170
        tv->tv_usec = 0;
171
        tv->tv_sec = s1 > s2 ? s1 : s2;
172
    } else
173
        tv->tv_sec = s1;
1435 palkovsky 174
 
175
    return 0;
176
}
1452 palkovsky 177
 
2564 jermar 178
time_t time(time_t *tloc)
179
{
180
    struct timeval tv;
181
 
182
    if (gettimeofday(&tv, NULL))
183
        return (time_t) -1;
184
    if (tloc)
185
        *tloc = tv.tv_sec;
186
    return tv.tv_sec;
187
}
188
 
2188 decky 189
/** Wait unconditionally for specified number of microseconds */
1452 palkovsky 190
void usleep(unsigned long usec)
191
{
192
    atomic_t futex = FUTEX_INITIALIZER;
193
 
2188 decky 194
    futex_initialize(&futex, 0);
1452 palkovsky 195
    futex_down_timeout(&futex, usec, 0);
196
}
1653 cejka 197
 
2188 decky 198
/** Wait unconditionally for specified number of seconds */
199
unsigned int sleep(unsigned int seconds)
200
{
201
    atomic_t futex = FUTEX_INITIALIZER;
202
 
203
    futex_initialize(&futex, 0);
204
 
205
    /* Sleep in 1000 second steps to support
206
       full argument range */
207
    while (seconds > 0) {
208
        unsigned int period = (seconds > 1000) ? 1000 : seconds;
209
 
210
        futex_down_timeout(&futex, period * 1000000, 0);
211
        seconds -= period;
212
    }
213
}
214
 
1719 decky 215
/** @}
1653 cejka 216
 */