648db22b |
1 | /* |
2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
3 | * All rights reserved. |
4 | * |
5 | * This source code is licensed under both the BSD-style license (found in the |
6 | * LICENSE file in the root directory of this source tree) and the GPLv2 (found |
7 | * in the COPYING file in the root directory of this source tree). |
8 | * You may select, at your option, one of the above-listed licenses. |
9 | */ |
10 | |
11 | |
12 | /* === Dependencies === */ |
13 | |
14 | #include "timefn.h" |
15 | #include "platform.h" /* set _POSIX_C_SOURCE */ |
16 | #include <time.h> /* CLOCK_MONOTONIC, TIME_UTC */ |
17 | |
18 | /*-**************************************** |
19 | * Time functions |
20 | ******************************************/ |
21 | |
22 | #if defined(_WIN32) /* Windows */ |
23 | |
24 | #include <windows.h> /* LARGE_INTEGER */ |
25 | #include <stdlib.h> /* abort */ |
26 | #include <stdio.h> /* perror */ |
27 | |
28 | UTIL_time_t UTIL_getTime(void) |
29 | { |
30 | static LARGE_INTEGER ticksPerSecond; |
31 | static int init = 0; |
32 | if (!init) { |
33 | if (!QueryPerformanceFrequency(&ticksPerSecond)) { |
34 | perror("timefn::QueryPerformanceFrequency"); |
35 | abort(); |
36 | } |
37 | init = 1; |
38 | } |
39 | { UTIL_time_t r; |
40 | LARGE_INTEGER x; |
41 | QueryPerformanceCounter(&x); |
42 | r.t = (PTime)(x.QuadPart * 1000000000ULL / ticksPerSecond.QuadPart); |
43 | return r; |
44 | } |
45 | } |
46 | |
47 | |
48 | #elif defined(__APPLE__) && defined(__MACH__) |
49 | |
50 | #include <mach/mach_time.h> /* mach_timebase_info_data_t, mach_timebase_info, mach_absolute_time */ |
51 | |
52 | UTIL_time_t UTIL_getTime(void) |
53 | { |
54 | static mach_timebase_info_data_t rate; |
55 | static int init = 0; |
56 | if (!init) { |
57 | mach_timebase_info(&rate); |
58 | init = 1; |
59 | } |
60 | { UTIL_time_t r; |
61 | r.t = mach_absolute_time() * (PTime)rate.numer / (PTime)rate.denom; |
62 | return r; |
63 | } |
64 | } |
65 | |
66 | /* POSIX.1-2001 (optional) */ |
67 | #elif defined(CLOCK_MONOTONIC) |
68 | |
69 | #include <stdlib.h> /* abort */ |
70 | #include <stdio.h> /* perror */ |
71 | |
72 | UTIL_time_t UTIL_getTime(void) |
73 | { |
74 | /* time must be initialized, othersize it may fail msan test. |
75 | * No good reason, likely a limitation of timespec_get() for some target */ |
76 | struct timespec time = { 0, 0 }; |
77 | if (clock_gettime(CLOCK_MONOTONIC, &time) != 0) { |
78 | perror("timefn::clock_gettime(CLOCK_MONOTONIC)"); |
79 | abort(); |
80 | } |
81 | { UTIL_time_t r; |
82 | r.t = (PTime)time.tv_sec * 1000000000ULL + (PTime)time.tv_nsec; |
83 | return r; |
84 | } |
85 | } |
86 | |
87 | |
88 | /* C11 requires support of timespec_get(). |
89 | * However, FreeBSD 11 claims C11 compliance while lacking timespec_get(). |
90 | * Double confirm timespec_get() support by checking the definition of TIME_UTC. |
91 | * However, some versions of Android manage to simultaneously define TIME_UTC |
92 | * and lack timespec_get() support... */ |
93 | #elif (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L) /* C11 */) \ |
94 | && defined(TIME_UTC) && !defined(__ANDROID__) |
95 | |
96 | #include <stdlib.h> /* abort */ |
97 | #include <stdio.h> /* perror */ |
98 | |
99 | UTIL_time_t UTIL_getTime(void) |
100 | { |
101 | /* time must be initialized, othersize it may fail msan test. |
102 | * No good reason, likely a limitation of timespec_get() for some target */ |
103 | struct timespec time = { 0, 0 }; |
104 | if (timespec_get(&time, TIME_UTC) != TIME_UTC) { |
105 | perror("timefn::timespec_get(TIME_UTC)"); |
106 | abort(); |
107 | } |
108 | { UTIL_time_t r; |
109 | r.t = (PTime)time.tv_sec * 1000000000ULL + (PTime)time.tv_nsec; |
110 | return r; |
111 | } |
112 | } |
113 | |
114 | |
115 | #else /* relies on standard C90 (note : clock_t produces wrong measurements for multi-threaded workloads) */ |
116 | |
117 | UTIL_time_t UTIL_getTime(void) |
118 | { |
119 | UTIL_time_t r; |
120 | r.t = (PTime)clock() * 1000000000ULL / CLOCKS_PER_SEC; |
121 | return r; |
122 | } |
123 | |
124 | #define TIME_MT_MEASUREMENTS_NOT_SUPPORTED |
125 | |
126 | #endif |
127 | |
128 | /* ==== Common functions, valid for all time API ==== */ |
129 | |
130 | PTime UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd) |
131 | { |
132 | return clockEnd.t - clockStart.t; |
133 | } |
134 | |
135 | PTime UTIL_getSpanTimeMicro(UTIL_time_t begin, UTIL_time_t end) |
136 | { |
137 | return UTIL_getSpanTimeNano(begin, end) / 1000ULL; |
138 | } |
139 | |
140 | PTime UTIL_clockSpanMicro(UTIL_time_t clockStart ) |
141 | { |
142 | UTIL_time_t const clockEnd = UTIL_getTime(); |
143 | return UTIL_getSpanTimeMicro(clockStart, clockEnd); |
144 | } |
145 | |
146 | PTime UTIL_clockSpanNano(UTIL_time_t clockStart ) |
147 | { |
148 | UTIL_time_t const clockEnd = UTIL_getTime(); |
149 | return UTIL_getSpanTimeNano(clockStart, clockEnd); |
150 | } |
151 | |
152 | void UTIL_waitForNextTick(void) |
153 | { |
154 | UTIL_time_t const clockStart = UTIL_getTime(); |
155 | UTIL_time_t clockEnd; |
156 | do { |
157 | clockEnd = UTIL_getTime(); |
158 | } while (UTIL_getSpanTimeNano(clockStart, clockEnd) == 0); |
159 | } |
160 | |
161 | int UTIL_support_MT_measurements(void) |
162 | { |
163 | # if defined(TIME_MT_MEASUREMENTS_NOT_SUPPORTED) |
164 | return 0; |
165 | # else |
166 | return 1; |
167 | # endif |
168 | } |