proxygen
Time.h
Go to the documentation of this file.
1 /*
2  * Copyright 2016-present Facebook, Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include <stdint.h>
20 #include <time.h>
21 
23 
24 // OSX is a pain. The XCode 8 SDK always declares clock_gettime
25 // even if the target OS version doesn't support it, so you get
26 // an error at runtime because it can't resolve the symbol. We
27 // solve that by pretending we have it here in the header and
28 // then enable our implementation on the source side so that
29 // gets linked in instead.
30 #if __MACH__ && \
31  (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_12 || \
32  __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_10_0)
33 
34 #ifdef FOLLY_HAVE_CLOCK_GETTIME
35 #undef FOLLY_HAVE_CLOCK_GETTIME
36 #endif
37 
38 #define FOLLY_HAVE_CLOCK_GETTIME 1
39 #define FOLLY_FORCE_CLOCK_GETTIME_DEFINITION 1
40 
41 #endif
42 
43 // These aren't generic implementations, so we can only declare them on
44 // platforms we support.
45 #if !FOLLY_HAVE_CLOCK_GETTIME && (defined(__MACH__) || defined(_WIN32))
46 #define CLOCK_REALTIME 0
47 #define CLOCK_MONOTONIC 1
48 #define CLOCK_PROCESS_CPUTIME_ID 2
49 #define CLOCK_THREAD_CPUTIME_ID 3
50 
51 typedef uint8_t clockid_t;
52 extern "C" int clock_gettime(clockid_t clk_id, struct timespec* ts);
53 extern "C" int clock_getres(clockid_t clk_id, struct timespec* ts);
54 #endif
55 
56 #ifdef _WIN32
57 #define TM_YEAR_BASE (1900)
58 
59 extern "C" {
60 char* asctime_r(const tm* tm, char* buf);
61 char* ctime_r(const time_t* t, char* buf);
62 tm* gmtime_r(const time_t* t, tm* res);
63 tm* localtime_r(const time_t* t, tm* o);
64 int nanosleep(const struct timespec* request, struct timespec* remain);
65 char* strptime(
66  const char* __restrict buf,
67  const char* __restrict fmt,
68  struct tm* __restrict tm);
69 }
70 #endif
int(* clock_gettime)(clockid_t, timespec *ts)