1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
/*
* hdhomerun_os_posix.c
*
* Copyright © 2006-2010 Silicondust USA Inc. <www.silicondust.com>.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception to the GNU Lesser General Public License,
* you may link, statically or dynamically, an application with a
* publicly distributed version of the Library to produce an
* executable file containing portions of the Library, and
* distribute that executable file under terms of your choice,
* without any of the additional requirements listed in clause 4 of
* the GNU Lesser General Public License.
*
* By "a publicly distributed version of the Library", we mean
* either the unmodified Library as distributed by Silicondust, or a
* modified version of the Library that is distributed under the
* conditions defined in the GNU Lesser General Public License.
*/
#include "hdhomerun_os.h"
uint32_t random_get32(void)
{
FILE *fp = fopen("/dev/urandom", "rb");
if (!fp) {
return (uint32_t)rand();
}
uint32_t Result;
if (fread(&Result, 4, 1, fp) != 1) {
Result = (uint32_t)rand();
}
fclose(fp);
return Result;
}
uint64_t getcurrenttime(void)
{
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
static uint64_t result = 0;
static uint64_t previous_time = 0;
pthread_mutex_lock(&lock);
#if defined(CLOCK_MONOTONIC)
struct timespec tp;
clock_gettime(CLOCK_MONOTONIC, &tp);
uint64_t current_time = ((uint64_t)tp.tv_sec * 1000) + (tp.tv_nsec / 1000000);
#else
struct timeval t;
gettimeofday(&t, NULL);
uint64_t current_time = ((uint64_t)t.tv_sec * 1000) + (t.tv_usec / 1000);
#endif
if (current_time > previous_time) {
result += current_time - previous_time;
}
previous_time = current_time;
pthread_mutex_unlock(&lock);
return result;
}
void msleep_approx(uint64_t ms)
{
unsigned int delay_s = ms / 1000;
if (delay_s > 0) {
sleep(delay_s);
ms -= delay_s * 1000;
}
unsigned int delay_us = ms * 1000;
if (delay_us > 0) {
usleep(delay_us);
}
}
void msleep_minimum(uint64_t ms)
{
uint64_t stop_time = getcurrenttime() + ms;
while (1) {
uint64_t current_time = getcurrenttime();
if (current_time >= stop_time) {
return;
}
msleep_approx(stop_time - current_time);
}
}
|
