Line data Source code
1 : /*
2 : *
3 : * Copyright 2015, Google Inc.
4 : * All rights reserved.
5 : *
6 : * Redistribution and use in source and binary forms, with or without
7 : * modification, are permitted provided that the following conditions are
8 : * met:
9 : *
10 : * * Redistributions of source code must retain the above copyright
11 : * notice, this list of conditions and the following disclaimer.
12 : * * Redistributions in binary form must reproduce the above
13 : * copyright notice, this list of conditions and the following disclaimer
14 : * in the documentation and/or other materials provided with the
15 : * distribution.
16 : * * Neither the name of Google Inc. nor the names of its
17 : * contributors may be used to endorse or promote products derived from
18 : * this software without specific prior written permission.
19 : *
20 : * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 : * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 : * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 : * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 : * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 : * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 : * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 : * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 : * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 : * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 : * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 : *
32 : */
33 :
34 : #include <grpc/support/port_platform.h>
35 : #include <src/core/support/time_precise.h>
36 :
37 : #ifdef GPR_POSIX_TIME
38 :
39 : #include <stdlib.h>
40 : #include <time.h>
41 : #include <unistd.h>
42 : #include <grpc/support/log.h>
43 : #include <grpc/support/time.h>
44 : #include "src/core/support/block_annotate.h"
45 :
46 55 : static struct timespec timespec_from_gpr(gpr_timespec gts) {
47 : struct timespec rv;
48 55 : rv.tv_sec = gts.tv_sec;
49 55 : rv.tv_nsec = gts.tv_nsec;
50 55 : return rv;
51 : }
52 :
53 : #if _POSIX_TIMERS > 0
54 23357476 : static gpr_timespec gpr_from_timespec(struct timespec ts,
55 : gpr_clock_type clock_type) {
56 : gpr_timespec rv;
57 23357476 : rv.tv_sec = ts.tv_sec;
58 23393695 : rv.tv_nsec = (int)ts.tv_nsec;
59 23357476 : rv.clock_type = clock_type;
60 23357476 : return rv;
61 : }
62 :
63 : /** maps gpr_clock_type --> clockid_t for clock_gettime */
64 : static clockid_t clockid_for_gpr_clock[] = {CLOCK_MONOTONIC, CLOCK_REALTIME};
65 :
66 3452 : void gpr_time_init(void) { gpr_precise_clock_init(); }
67 :
68 23364098 : gpr_timespec gpr_now(gpr_clock_type clock_type) {
69 : struct timespec now;
70 23364098 : GPR_ASSERT(clock_type != GPR_TIMESPAN);
71 23364098 : if (clock_type == GPR_CLOCK_PRECISE) {
72 : gpr_timespec ret;
73 0 : gpr_precise_clock_now(&ret);
74 0 : return ret;
75 : } else {
76 23364098 : clock_gettime(clockid_for_gpr_clock[clock_type], &now);
77 23346158 : return gpr_from_timespec(now, clock_type);
78 : }
79 : }
80 : #else
81 : /* For some reason Apple's OSes haven't implemented clock_gettime. */
82 :
83 : #include <sys/time.h>
84 : #include <mach/mach.h>
85 : #include <mach/mach_time.h>
86 :
87 : static double g_time_scale;
88 : static uint64_t g_time_start;
89 :
90 : void gpr_time_init(void) {
91 : mach_timebase_info_data_t tb = {0, 1};
92 : gpr_precise_clock_init();
93 : mach_timebase_info(&tb);
94 : g_time_scale = tb.numer;
95 : g_time_scale /= tb.denom;
96 : g_time_start = mach_absolute_time();
97 : }
98 :
99 : gpr_timespec gpr_now(gpr_clock_type clock) {
100 : gpr_timespec now;
101 : struct timeval now_tv;
102 : double now_dbl;
103 :
104 : now.clock_type = clock;
105 : switch (clock) {
106 : case GPR_CLOCK_REALTIME:
107 : gettimeofday(&now_tv, NULL);
108 : now.tv_sec = now_tv.tv_sec;
109 : now.tv_nsec = now_tv.tv_usec * 1000;
110 : break;
111 : case GPR_CLOCK_MONOTONIC:
112 : now_dbl = (mach_absolute_time() - g_time_start) * g_time_scale;
113 : now.tv_sec = (time_t)(now_dbl * 1e-9);
114 : now.tv_nsec = (int)(now_dbl - ((double)now.tv_sec) * 1e9);
115 : break;
116 : case GPR_CLOCK_PRECISE:
117 : gpr_precise_clock_now(&now);
118 : break;
119 : case GPR_TIMESPAN:
120 : abort();
121 : }
122 :
123 : return now;
124 : }
125 : #endif
126 :
127 55 : void gpr_sleep_until(gpr_timespec until) {
128 : gpr_timespec now;
129 : gpr_timespec delta;
130 : struct timespec delta_ts;
131 : int ns_result;
132 :
133 : for (;;) {
134 : /* We could simplify by using clock_nanosleep instead, but it might be
135 : * slightly less portable. */
136 55 : now = gpr_now(until.clock_type);
137 55 : if (gpr_time_cmp(until, now) <= 0) {
138 55 : return;
139 : }
140 :
141 55 : delta = gpr_time_sub(until, now);
142 55 : delta_ts = timespec_from_gpr(delta);
143 : GRPC_SCHEDULING_START_BLOCKING_REGION;
144 55 : ns_result = nanosleep(&delta_ts, NULL);
145 : GRPC_SCHEDULING_END_BLOCKING_REGION;
146 55 : if (ns_result == 0) {
147 55 : break;
148 : }
149 0 : }
150 : }
151 :
152 : #endif /* GPR_POSIX_TIME */
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