src/time.h

   1 /*
   2  * Copyright (c) 2008-2009 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_APACHE_LICENSE_HEADER_START@
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *
  18  * @APPLE_APACHE_LICENSE_HEADER_END@
  19  */
  20
  21 #ifndef __DISPATCH_TIME__
  22 #define __DISPATCH_TIME__
  23
  24 #ifndef __DISPATCH_INDIRECT__
  25 #error "Please #include <dispatch/dispatch.h> instead of this file directly."
  26 #include <dispatch/base.h> // for HeaderDoc
  27 #endif
  28
  29 #include <stdint.h>
  30
  31 __BEGIN_DECLS
  32
  33 struct timespec;
  34
  35 // 6368156
  36 #ifdef NSEC_PER_SEC
  37 #undef NSEC_PER_SEC
  38 #endif
  39 #ifdef USEC_PER_SEC
  40 #undef USEC_PER_SEC
  41 #endif
  42 #ifdef NSEC_PER_USEC
  43 #undef NSEC_PER_USEC
  44 #endif
  45 #define NSEC_PER_SEC 1000000000ull
  46 #define USEC_PER_SEC 1000000ull
  47 #define NSEC_PER_USEC 1000ull
  48
  49 /*!
  50  * @typedef dispatch_time_t
  51  *
  52  * @abstract
  53  * An somewhat abstract representation of time; where zero means "now" and
  54  * DISPATCH_TIME_FOREVER means "infinity" and every value in between is an
  55  * opaque encoding.
  56  */
  57 typedef uint64_t dispatch_time_t;
  58
  59 #define DISPATCH_TIME_NOW 0
  60 #define DISPATCH_TIME_FOREVER (~0ull)
  61
  62 /*!
  63  * @function dispatch_time
  64  *
  65  * @abstract
  66  * Create dispatch_time_t relative to the default clock or modify an existing
  67  * dispatch_time_t.
  68  *
  69  * @discussion
  70  * On Mac OS X the default clock is based on mach_absolute_time().
  71  *
  72  * @param when
  73  * An optional dispatch_time_t to add nanoseconds to. If zero is passed, then
  74  * dispatch_time() will use the result of mach_absolute_time().
  75  *
  76  * @param delta
  77  * Nanoseconds to add.
  78  *
  79  * @result
  80  * A new dispatch_time_t.
  81  */
  82 __OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
  83 DISPATCH_NOTHROW
  84 dispatch_time_t
  85 dispatch_time(dispatch_time_t when, int64_t delta);
  86
  87 /*!
  88  * @function dispatch_walltime
  89  *
  90  * @abstract
  91  * Create a dispatch_time_t using the wall clock.
  92  *
  93  * @discussion
  94  * On Mac OS X the wall clock is based on gettimeofday(3).
  95  *
  96  * @param when
  97  * A struct timespect to add time to. If NULL is passed, then
  98  * dispatch_walltime() will use the result of gettimeofday(3).
  99  *
 100  * @param delta
 101  * Nanoseconds to add.
 102  *
 103  * @result
 104  * A new dispatch_time_t.
 105  */
 106 __OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
 107 DISPATCH_NOTHROW
 108 dispatch_time_t
 109 dispatch_walltime(const struct timespec *when, int64_t delta);
 110
 111 __END_DECLS
 112
 113 #endif