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1 | /* | |
2 | * This file is part of the libserialport project. | |
3 | * | |
4 | * Copyright (C) 2019 Martin Ling <martin-libserialport@earth.li> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU Lesser General Public License as | |
8 | * published by the Free Software Foundation, either version 3 of the | |
9 | * License, or (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 Lesser General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include "libserialport_internal.h" | |
21 | ||
22 | SP_PRIV void time_get(struct time *time) | |
23 | { | |
24 | #ifdef _WIN32 | |
25 | LARGE_INTEGER count; | |
26 | QueryPerformanceCounter(&count); | |
27 | time->ticks = count.QuadPart; | |
28 | #elif defined(HAVE_CLOCK_GETTIME) | |
29 | struct timespec ts; | |
30 | if (clock_gettime(CLOCK_MONOTONIC, &ts) == -1) | |
31 | clock_gettime(CLOCK_REALTIME, &ts); | |
32 | time->tv.tv_sec = ts.tv_sec; | |
33 | time->tv.tv_usec = ts.tv_nsec / 1000; | |
34 | #elif defined(__APPLE__) | |
35 | mach_timebase_info_data_t info; | |
36 | mach_timebase_info(&info); | |
37 | uint64_t ticks = mach_absolute_time(); | |
38 | uint64_t ns = (ticks * info.numer) / info.denom; | |
39 | time->tv.tv_sec = ns / 1000000000; | |
40 | time->tv.tv_usec = (ns % 1000000000) / 1000; | |
41 | #else | |
42 | gettimeofday(&time->tv, NULL); | |
43 | #endif | |
44 | } | |
45 | ||
46 | SP_PRIV void time_set_ms(struct time *time, unsigned int ms) | |
47 | { | |
48 | #ifdef _WIN32 | |
49 | LARGE_INTEGER frequency; | |
50 | QueryPerformanceFrequency(&frequency); | |
51 | time->ticks = ms * (frequency.QuadPart / 1000); | |
52 | #else | |
53 | time->tv.tv_sec = ms / 1000; | |
54 | time->tv.tv_usec = (ms % 1000) * 1000; | |
55 | #endif | |
56 | } | |
57 | ||
58 | SP_PRIV void time_add(const struct time *a, | |
59 | const struct time *b, struct time *result) | |
60 | { | |
61 | #ifdef _WIN32 | |
62 | result->ticks = a->ticks + b->ticks; | |
63 | #else | |
64 | timeradd(&a->tv, &b->tv, &result->tv); | |
65 | #endif | |
66 | } | |
67 | ||
68 | SP_PRIV void time_sub(const struct time *a, | |
69 | const struct time *b, struct time *result) | |
70 | { | |
71 | #ifdef _WIN32 | |
72 | result->ticks = a->ticks - b->ticks; | |
73 | #else | |
74 | timersub(&a->tv, &b->tv, &result->tv); | |
75 | #endif | |
76 | } | |
77 | ||
78 | SP_PRIV bool time_greater(const struct time *a, const struct time *b) | |
79 | { | |
80 | #ifdef _WIN32 | |
81 | return (a->ticks > b->ticks); | |
82 | #else | |
83 | return timercmp(&a->tv, &b->tv, >); | |
84 | #endif | |
85 | } | |
86 | ||
87 | SP_PRIV void time_as_timeval(const struct time *time, struct timeval *tv) | |
88 | { | |
89 | #ifdef _WIN32 | |
90 | LARGE_INTEGER frequency; | |
91 | QueryPerformanceFrequency(&frequency); | |
92 | tv->tv_sec = (long) (time->ticks / frequency.QuadPart); | |
93 | tv->tv_usec = (long) ((time->ticks % frequency.QuadPart) / | |
94 | (frequency.QuadPart / 1000000)); | |
95 | #else | |
96 | *tv = time->tv; | |
97 | #endif | |
98 | } | |
99 | ||
100 | SP_PRIV unsigned int time_as_ms(const struct time *time) | |
101 | { | |
102 | #ifdef _WIN32 | |
103 | LARGE_INTEGER frequency; | |
104 | QueryPerformanceFrequency(&frequency); | |
105 | return (unsigned int) (time->ticks / (frequency.QuadPart / 1000)); | |
106 | #else | |
107 | return time->tv.tv_sec * 1000 + time->tv.tv_usec / 1000; | |
108 | #endif | |
109 | } | |
110 | ||
111 | SP_PRIV void timeout_start(struct timeout *timeout, unsigned int timeout_ms) | |
112 | { | |
113 | timeout->ms = timeout_ms; | |
114 | ||
115 | /* Get time at start of operation. */ | |
116 | time_get(&timeout->start); | |
117 | /* Define duration of timeout. */ | |
118 | time_set_ms(&timeout->delta, timeout_ms); | |
119 | /* Calculate time at which we should give up. */ | |
120 | time_add(&timeout->start, &timeout->delta, &timeout->end); | |
121 | /* Disable limit unless timeout_limit() called. */ | |
122 | timeout->limit_ms = 0; | |
123 | /* First blocking call has not yet been made. */ | |
124 | timeout->calls_started = false; | |
125 | } | |
126 | ||
127 | SP_PRIV void timeout_limit(struct timeout *timeout, unsigned int limit_ms) | |
128 | { | |
129 | timeout->limit_ms = limit_ms; | |
130 | timeout->overflow = (timeout->ms > timeout->limit_ms); | |
131 | time_set_ms(&timeout->delta_max, timeout->limit_ms); | |
132 | } | |
133 | ||
134 | SP_PRIV bool timeout_check(struct timeout *timeout) | |
135 | { | |
136 | if (!timeout->calls_started) | |
137 | return false; | |
138 | ||
139 | if (timeout->ms == 0) | |
140 | return false; | |
141 | ||
142 | time_get(&timeout->now); | |
143 | time_sub(&timeout->end, &timeout->now, &timeout->delta); | |
144 | if (timeout->limit_ms) | |
145 | if ((timeout->overflow = time_greater(&timeout->delta, &timeout->delta_max))) | |
146 | timeout->delta = timeout->delta_max; | |
147 | ||
148 | return time_greater(&timeout->now, &timeout->end); | |
149 | } | |
150 | ||
151 | SP_PRIV void timeout_update(struct timeout *timeout) | |
152 | { | |
153 | timeout->calls_started = true; | |
154 | } | |
155 | ||
156 | #ifndef _WIN32 | |
157 | SP_PRIV struct timeval *timeout_timeval(struct timeout *timeout) | |
158 | { | |
159 | if (timeout->ms == 0) | |
160 | return NULL; | |
161 | ||
162 | time_as_timeval(&timeout->delta, &timeout->delta_tv); | |
163 | ||
164 | return &timeout->delta_tv; | |
165 | } | |
166 | #endif | |
167 | ||
168 | SP_PRIV unsigned int timeout_remaining_ms(struct timeout *timeout) | |
169 | { | |
170 | if (timeout->limit_ms && timeout->overflow) | |
171 | return timeout->limit_ms; | |
172 | else | |
173 | return time_as_ms(&timeout->delta); | |
174 | } |