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39acdc47 ML |
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 <config.h> | |
21 | #include "libserialport.h" | |
22 | #include "libserialport_internal.h" | |
23 | ||
24 | SP_PRIV void time_get(struct time *time) | |
25 | { | |
26 | #ifdef _WIN32 | |
27 | LARGE_INTEGER count; | |
28 | QueryPerformanceCounter(&count); | |
29 | time->ticks = count.QuadPart; | |
30 | #elif defined(HAVE_CLOCK_GETTIME) | |
31 | struct timespec ts; | |
32 | if (clock_gettime(CLOCK_MONOTONIC, &ts) == -1) | |
33 | clock_gettime(CLOCK_REALTIME, &ts); | |
34 | time->tv.tv_sec = ts.tv_sec; | |
35 | time->tv.tv_usec = ts.tv_nsec / 1000; | |
36 | #elif defined(__APPLE__) | |
37 | mach_timebase_info_data_t info; | |
38 | mach_timebase_info(&info); | |
39 | uint64_t ticks = mach_absolute_time(); | |
40 | uint64_t ns = (ticks * info.numer) / info.denom; | |
41 | time->tv.tv_sec = ns / 1000000000; | |
42 | time->tv.tv_usec = (ns % 1000000000) / 1000; | |
43 | #else | |
44 | gettimeofday(&time->tv, NULL); | |
45 | #endif | |
46 | } | |
47 | ||
48 | SP_PRIV void time_set_ms(struct time *time, unsigned int ms) | |
49 | { | |
50 | #ifdef _WIN32 | |
51 | LARGE_INTEGER frequency; | |
52 | QueryPerformanceFrequency(&frequency); | |
53 | time->ticks = ms * (frequency.QuadPart / 1000); | |
54 | #else | |
55 | time->tv.tv_sec = ms / 1000; | |
56 | time->tv.tv_usec = (ms % 1000) * 1000; | |
57 | #endif | |
58 | } | |
59 | ||
60 | SP_PRIV void time_add(const struct time *a, | |
61 | const struct time *b, struct time *result) | |
62 | { | |
63 | #ifdef _WIN32 | |
64 | result->ticks = a->ticks + b->ticks; | |
65 | #else | |
66 | timeradd(&a->tv, &b->tv, &result->tv); | |
67 | #endif | |
68 | } | |
69 | ||
70 | SP_PRIV void time_sub(const struct time *a, | |
71 | const struct time *b, struct time *result) | |
72 | { | |
73 | #ifdef _WIN32 | |
74 | result->ticks = a->ticks - b->ticks; | |
75 | #else | |
76 | timersub(&a->tv, &b->tv, &result->tv); | |
77 | #endif | |
78 | } | |
79 | ||
80 | SP_PRIV bool time_greater(const struct time *a, const struct time *b) | |
81 | { | |
82 | #ifdef _WIN32 | |
83 | return (a->ticks > b->ticks); | |
84 | #else | |
85 | return timercmp(&a->tv, &b->tv, >); | |
86 | #endif | |
87 | } | |
88 | ||
89 | SP_PRIV void time_as_timeval(const struct time *time, struct timeval *tv) | |
90 | { | |
91 | #ifdef _WIN32 | |
92 | LARGE_INTEGER frequency; | |
93 | QueryPerformanceFrequency(&frequency); | |
94 | tv->tv_sec = time->ticks / frequency.QuadPart; | |
95 | tv->tv_usec = (time->ticks % frequency.QuadPart) / | |
96 | (frequency.QuadPart / 1000000); | |
97 | #else | |
98 | *tv = time->tv; | |
99 | #endif | |
100 | } | |
101 | ||
102 | SP_PRIV unsigned int time_as_ms(const struct time *time) | |
103 | { | |
104 | #ifdef _WIN32 | |
105 | LARGE_INTEGER frequency; | |
106 | QueryPerformanceFrequency(&frequency); | |
107 | return time->ticks / (frequency.QuadPart / 1000); | |
108 | #else | |
109 | return time->tv.tv_sec * 1000 + time->tv.tv_usec / 1000; | |
110 | #endif | |
111 | } | |
112 | ||
113 | SP_PRIV void timeout_start(struct timeout *timeout, unsigned int timeout_ms) | |
114 | { | |
115 | timeout->ms = timeout_ms; | |
116 | ||
117 | /* Get time at start of operation. */ | |
118 | time_get(&timeout->start); | |
119 | /* Define duration of timeout. */ | |
120 | time_set_ms(&timeout->delta, timeout_ms); | |
121 | /* Calculate time at which we should give up. */ | |
122 | time_add(&timeout->start, &timeout->delta, &timeout->end); | |
123 | /* Disable limit unless timeout_limit() called. */ | |
124 | timeout->limit_ms = 0; | |
125 | /* First blocking call has not yet been made. */ | |
126 | timeout->calls_started = false; | |
127 | } | |
128 | ||
129 | SP_PRIV void timeout_limit(struct timeout *timeout, unsigned int limit_ms) | |
130 | { | |
131 | timeout->limit_ms = limit_ms; | |
132 | timeout->overflow = (timeout->ms > timeout->limit_ms); | |
133 | time_set_ms(&timeout->delta_max, timeout->limit_ms); | |
134 | } | |
135 | ||
136 | SP_PRIV bool timeout_check(struct timeout *timeout) | |
137 | { | |
138 | if (!timeout->calls_started) | |
139 | return false; | |
140 | ||
141 | if (timeout->ms == 0) | |
142 | return false; | |
143 | ||
144 | time_get(&timeout->now); | |
145 | time_sub(&timeout->end, &timeout->now, &timeout->delta); | |
146 | if (timeout->limit_ms) | |
147 | if ((timeout->overflow = time_greater(&timeout->delta, &timeout->delta_max))) | |
148 | timeout->delta = timeout->delta_max; | |
149 | ||
150 | return time_greater(&timeout->now, &timeout->end); | |
151 | } | |
152 | ||
153 | SP_PRIV void timeout_update(struct timeout *timeout) | |
154 | { | |
155 | timeout->calls_started = true; | |
156 | } | |
157 | ||
158 | #ifndef _WIN32 | |
159 | SP_PRIV struct timeval *timeout_timeval(struct timeout *timeout) | |
160 | { | |
161 | if (timeout->ms == 0) | |
162 | return NULL; | |
163 | ||
164 | time_as_timeval(&timeout->delta, &timeout->delta_tv); | |
165 | ||
166 | return &timeout->delta_tv; | |
167 | } | |
168 | #endif | |
169 | ||
170 | SP_PRIV unsigned int timeout_remaining_ms(struct timeout *timeout) | |
171 | { | |
172 | if (timeout->limit_ms && timeout->overflow) | |
173 | return timeout->limit_ms; | |
174 | else | |
175 | return time_as_ms(&timeout->delta); | |
176 | } |