lib/timeval.h

   1 /*
   2  * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, 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 #ifndef TIMEVAL_H
  18 #define TIMEVAL_H 1
  19
  20 #include <time.h>
  21 #include "openvswitch/type-props.h"
  22 #include "util.h"
  23
  24 #ifdef  __cplusplus
  25 extern "C" {
  26 #endif
  27
  28 struct ds;
  29 struct pollfd;
  30 struct timespec;
  31 struct timeval;
  32
  33 /* POSIX allows floating-point time_t, but we don't support it. */
  34 BUILD_ASSERT_DECL(TYPE_IS_INTEGER(time_t));
  35
  36 /* We do try to cater to unsigned time_t, but I want to know about it if we
  37  * ever encounter such a platform. */
  38 BUILD_ASSERT_DECL(TYPE_IS_SIGNED(time_t));
  39
  40 #define TIME_MAX TYPE_MAXIMUM(time_t)
  41 #define TIME_MIN TYPE_MINIMUM(time_t)
  42
  43 #ifdef _WIN32
  44 #define localtime_r(timep, result) localtime_s(result, timep)
  45 #define gmtime_r(timep, result) gmtime_s(result, timep)
  46 #endif /* _WIN32 */
  47
  48 struct tm_msec {
  49   struct tm tm;
  50   int msec;
  51 };
  52
  53 time_t time_now(void);
  54 time_t time_wall(void);
  55 long long int time_msec(void);
  56 long long int time_wall_msec(void);
  57 long long int time_usec(void);
  58 long long int time_wall_usec(void);
  59 void time_timespec(struct timespec *);
  60 void time_wall_timespec(struct timespec *);
  61 void time_alarm(unsigned int secs);
  62 int time_poll(struct pollfd *, int n_pollfds, HANDLE *handles,
  63               long long int timeout_when, int *elapsed);
  64
  65 long long int timespec_to_msec(const struct timespec *);
  66 long long int timespec_to_usec(const struct timespec *);
  67 long long int timeval_to_msec(const struct timeval *);
  68 long long int timeval_to_usec(const struct timeval *);
  69
  70 struct tm_msec *localtime_msec(long long int now, struct tm_msec *result);
  71 struct tm_msec *gmtime_msec(long long int now, struct tm_msec *result);
  72 size_t strftime_msec(char *s, size_t max, const char *format,
  73                      const struct tm_msec *);
  74 void xgettimeofday(struct timeval *);
  75 void xclock_gettime(clock_t, struct timespec *);
  76 void nsec_to_timespec(long long int, struct timespec *);
  77
  78 int get_cpu_usage(void);
  79
  80 long long int time_boot_msec(void);
  81
  82 void timewarp_run(void);
  83
  84 #ifdef  __cplusplus
  85 }
  86 #endif
  87
  88 #endif /* timeval.h */