aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/core/support/time.c
blob: 423d12ffc0fd052da61b22d1322ee9e54ca1d04b (plain)
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
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
/*
 *
 * Copyright 2015-2016, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

/* Generic implementation of time calls. */

#include <grpc/support/time.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <grpc/support/log.h>

int gpr_time_cmp(gpr_timespec a, gpr_timespec b) {
  int cmp = (a.tv_sec > b.tv_sec) - (a.tv_sec < b.tv_sec);
  GPR_ASSERT(a.clock_type == b.clock_type);
  if (cmp == 0) {
    cmp = (a.tv_nsec > b.tv_nsec) - (a.tv_nsec < b.tv_nsec);
  }
  return cmp;
}

gpr_timespec gpr_time_min(gpr_timespec a, gpr_timespec b) {
  return gpr_time_cmp(a, b) < 0 ? a : b;
}

gpr_timespec gpr_time_max(gpr_timespec a, gpr_timespec b) {
  return gpr_time_cmp(a, b) > 0 ? a : b;
}

gpr_timespec gpr_time_0(gpr_clock_type type) {
  gpr_timespec out;
  out.tv_sec = 0;
  out.tv_nsec = 0;
  out.clock_type = type;
  return out;
}

gpr_timespec gpr_inf_future(gpr_clock_type type) {
  gpr_timespec out;
  out.tv_sec = INT64_MAX;
  out.tv_nsec = 0;
  out.clock_type = type;
  return out;
}

gpr_timespec gpr_inf_past(gpr_clock_type type) {
  gpr_timespec out;
  out.tv_sec = INT64_MIN;
  out.tv_nsec = 0;
  out.clock_type = type;
  return out;
}

/* TODO(ctiller): consider merging _nanos, _micros, _millis into a single
   function for maintainability. Similarly for _seconds, _minutes, and _hours */

gpr_timespec gpr_time_from_nanos(int64_t ns, gpr_clock_type type) {
  gpr_timespec result;
  result.clock_type = type;
  if (ns == INT64_MAX) {
    result = gpr_inf_future(type);
  } else if (ns == INT64_MIN) {
    result = gpr_inf_past(type);
  } else if (ns >= 0) {
    result.tv_sec = ns / GPR_NS_PER_SEC;
    result.tv_nsec = (int32_t)(ns - result.tv_sec * GPR_NS_PER_SEC);
  } else {
    /* Calculation carefully formulated to avoid any possible under/overflow. */
    result.tv_sec = (-(999999999 - (ns + GPR_NS_PER_SEC)) / GPR_NS_PER_SEC) - 1;
    result.tv_nsec = (int32_t)(ns - result.tv_sec * GPR_NS_PER_SEC);
  }
  return result;
}

gpr_timespec gpr_time_from_micros(int64_t us, gpr_clock_type type) {
  gpr_timespec result;
  result.clock_type = type;
  if (us == INT64_MAX) {
    result = gpr_inf_future(type);
  } else if (us == INT64_MIN) {
    result = gpr_inf_past(type);
  } else if (us >= 0) {
    result.tv_sec = us / 1000000;
    result.tv_nsec = (int32_t)((us - result.tv_sec * 1000000) * 1000);
  } else {
    /* Calculation carefully formulated to avoid any possible under/overflow. */
    result.tv_sec = (-(999999 - (us + 1000000)) / 1000000) - 1;
    result.tv_nsec = (int32_t)((us - result.tv_sec * 1000000) * 1000);
  }
  return result;
}

gpr_timespec gpr_time_from_millis(int64_t ms, gpr_clock_type type) {
  gpr_timespec result;
  result.clock_type = type;
  if (ms == INT64_MAX) {
    result = gpr_inf_future(type);
  } else if (ms == INT64_MIN) {
    result = gpr_inf_past(type);
  } else if (ms >= 0) {
    result.tv_sec = ms / 1000;
    result.tv_nsec = (int32_t)((ms - result.tv_sec * 1000) * 1000000);
  } else {
    /* Calculation carefully formulated to avoid any possible under/overflow. */
    result.tv_sec = (-(999 - (ms + 1000)) / 1000) - 1;
    result.tv_nsec = (int32_t)((ms - result.tv_sec * 1000) * 1000000);
  }
  return result;
}

gpr_timespec gpr_time_from_seconds(int64_t s, gpr_clock_type type) {
  gpr_timespec result;
  result.clock_type = type;
  if (s == INT64_MAX) {
    result = gpr_inf_future(type);
  } else if (s == INT64_MIN) {
    result = gpr_inf_past(type);
  } else {
    result.tv_sec = s;
    result.tv_nsec = 0;
  }
  return result;
}

gpr_timespec gpr_time_from_minutes(int64_t m, gpr_clock_type type) {
  gpr_timespec result;
  result.clock_type = type;
  if (m >= INT64_MAX / 60) {
    result = gpr_inf_future(type);
  } else if (m <= INT64_MIN / 60) {
    result = gpr_inf_past(type);
  } else {
    result.tv_sec = m * 60;
    result.tv_nsec = 0;
  }
  return result;
}

gpr_timespec gpr_time_from_hours(int64_t h, gpr_clock_type type) {
  gpr_timespec result;
  result.clock_type = type;
  if (h >= INT64_MAX / 3600) {
    result = gpr_inf_future(type);
  } else if (h <= INT64_MIN / 3600) {
    result = gpr_inf_past(type);
  } else {
    result.tv_sec = h * 3600;
    result.tv_nsec = 0;
  }
  return result;
}

gpr_timespec gpr_time_add(gpr_timespec a, gpr_timespec b) {
  gpr_timespec sum;
  int64_t inc = 0;
  GPR_ASSERT(b.clock_type == GPR_TIMESPAN);
  sum.clock_type = a.clock_type;
  sum.tv_nsec = a.tv_nsec + b.tv_nsec;
  if (sum.tv_nsec >= GPR_NS_PER_SEC) {
    sum.tv_nsec -= GPR_NS_PER_SEC;
    inc++;
  }
  if (a.tv_sec == INT64_MAX || a.tv_sec == INT64_MIN) {
    sum = a;
  } else if (b.tv_sec == INT64_MAX ||
             (b.tv_sec >= 0 && a.tv_sec >= INT64_MAX - b.tv_sec)) {
    sum = gpr_inf_future(sum.clock_type);
  } else if (b.tv_sec == INT64_MIN ||
             (b.tv_sec <= 0 && a.tv_sec <= INT64_MIN - b.tv_sec)) {
    sum = gpr_inf_past(sum.clock_type);
  } else {
    sum.tv_sec = a.tv_sec + b.tv_sec;
    if (inc != 0 && sum.tv_sec == INT64_MAX - 1) {
      sum = gpr_inf_future(sum.clock_type);
    } else {
      sum.tv_sec += inc;
    }
  }
  return sum;
}

gpr_timespec gpr_time_sub(gpr_timespec a, gpr_timespec b) {
  gpr_timespec diff;
  int64_t dec = 0;
  if (b.clock_type == GPR_TIMESPAN) {
    diff.clock_type = a.clock_type;
  } else {
    GPR_ASSERT(a.clock_type == b.clock_type);
    diff.clock_type = GPR_TIMESPAN;
  }
  diff.tv_nsec = a.tv_nsec - b.tv_nsec;
  if (diff.tv_nsec < 0) {
    diff.tv_nsec += GPR_NS_PER_SEC;
    dec++;
  }
  if (a.tv_sec == INT64_MAX || a.tv_sec == INT64_MIN) {
    diff = a;
  } else if (b.tv_sec == INT64_MIN ||
             (b.tv_sec <= 0 && a.tv_sec >= INT64_MAX + b.tv_sec)) {
    diff = gpr_inf_future(GPR_CLOCK_REALTIME);
  } else if (b.tv_sec == INT64_MAX ||
             (b.tv_sec >= 0 && a.tv_sec <= INT64_MIN + b.tv_sec)) {
    diff = gpr_inf_past(GPR_CLOCK_REALTIME);
  } else {
    diff.tv_sec = a.tv_sec - b.tv_sec;
    if (dec != 0 && diff.tv_sec == INT64_MIN + 1) {
      diff = gpr_inf_past(GPR_CLOCK_REALTIME);
    } else {
      diff.tv_sec -= dec;
    }
  }
  return diff;
}

int gpr_time_similar(gpr_timespec a, gpr_timespec b, gpr_timespec threshold) {
  int cmp_ab;

  GPR_ASSERT(a.clock_type == b.clock_type);
  GPR_ASSERT(threshold.clock_type == GPR_TIMESPAN);

  cmp_ab = gpr_time_cmp(a, b);
  if (cmp_ab == 0) return 1;
  if (cmp_ab < 0) {
    return gpr_time_cmp(gpr_time_sub(b, a), threshold) <= 0;
  } else {
    return gpr_time_cmp(gpr_time_sub(a, b), threshold) <= 0;
  }
}

int32_t gpr_time_to_millis(gpr_timespec t) {
  if (t.tv_sec >= 2147483) {
    if (t.tv_sec == 2147483 && t.tv_nsec < 648 * GPR_NS_PER_MS) {
      return 2147483 * GPR_MS_PER_SEC + t.tv_nsec / GPR_NS_PER_MS;
    }
    return 2147483647;
  } else if (t.tv_sec <= -2147483) {
    /* TODO(ctiller): correct handling here (it's so far in the past do we
       care?) */
    return -2147483647;
  } else {
    return (int32_t)(t.tv_sec * GPR_MS_PER_SEC + t.tv_nsec / GPR_NS_PER_MS);
  }
}

double gpr_timespec_to_micros(gpr_timespec t) {
  return (double)t.tv_sec * GPR_US_PER_SEC + t.tv_nsec * 1e-3;
}

gpr_timespec gpr_convert_clock_type(gpr_timespec t, gpr_clock_type clock_type) {
  if (t.clock_type == clock_type) {
    return t;
  }

  if (t.tv_nsec == 0) {
    if (t.tv_sec == INT64_MAX) {
      t.clock_type = clock_type;
      return t;
    }
    if (t.tv_sec == INT64_MIN) {
      t.clock_type = clock_type;
      return t;
    }
  }

  if (clock_type == GPR_TIMESPAN) {
    return gpr_time_sub(t, gpr_now(t.clock_type));
  }

  if (t.clock_type == GPR_TIMESPAN) {
    return gpr_time_add(gpr_now(clock_type), t);
  }

  return gpr_time_add(gpr_now(clock_type),
                      gpr_time_sub(t, gpr_now(t.clock_type)));
}