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Merge pull request #87 from kgoodier/review/absolute-time
Avoid use of CFAbsoluteTime as much as possible.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| // | ||
| // SPDYStopwatch.h | ||
| // SPDY | ||
| // | ||
| // Copyright (c) 2014 Twitter, Inc. All rights reserved. | ||
| // Licensed under the Apache License v2.0 | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Created by Kevin Goodier. | ||
| // | ||
|
|
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| typedef double SPDYTimeInterval; | ||
|
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| @interface SPDYStopwatch : NSObject | ||
| + (SPDYTimeInterval)currentSystemTime; | ||
| + (SPDYTimeInterval)currentAbsoluteTime; | ||
| - (id)init; | ||
| - (void)reset; | ||
| - (SPDYTimeInterval)elapsedSeconds; | ||
| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| // | ||
| // SPDYStopwatch.m | ||
| // SPDY | ||
| // | ||
| // Copyright (c) 2014 Twitter, Inc. All rights reserved. | ||
| // Licensed under the Apache License v2.0 | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Created by Kevin Goodier | ||
| // | ||
|
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| #import <mach/mach_time.h> | ||
| #import "SPDYStopwatch.h" | ||
|
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| @implementation SPDYStopwatch | ||
| { | ||
| SPDYTimeInterval _startTime; | ||
| } | ||
|
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| static dispatch_once_t __initTimebase; | ||
| static double __machTimebaseToSeconds; | ||
| static mach_timebase_info_data_t __machTimebase; | ||
|
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| + (void)initialize | ||
| { | ||
| dispatch_once(&__initTimebase, ^{ | ||
| kern_return_t status = mach_timebase_info(&__machTimebase); | ||
| // Everything will be 0 if this fails. | ||
| if (status != KERN_SUCCESS) { | ||
| __machTimebase.numer = 0; | ||
| __machTimebase.denom = 1; | ||
| } | ||
| __machTimebaseToSeconds = (double)__machTimebase.numer / ((double)__machTimebase.denom * 1000000000.0); | ||
| }); | ||
| } | ||
|
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| + (SPDYTimeInterval)currentSystemTime | ||
| { | ||
| uint64_t now = mach_absolute_time(); | ||
| return (SPDYTimeInterval)now * __machTimebaseToSeconds; | ||
| } | ||
|
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| + (SPDYTimeInterval)currentAbsoluteTime | ||
| { | ||
| return CFAbsoluteTimeGetCurrent(); | ||
| } | ||
|
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| - (id)init | ||
| { | ||
| self = [super init]; | ||
| if (self) { | ||
| _startTime = [SPDYStopwatch currentAbsoluteTime]; | ||
| } | ||
| return self; | ||
| } | ||
|
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| - (void)reset | ||
| { | ||
| _startTime = [SPDYStopwatch currentAbsoluteTime]; | ||
| } | ||
|
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| - (SPDYTimeInterval)elapsedSeconds | ||
| { | ||
| return [SPDYStopwatch currentAbsoluteTime] - _startTime; | ||
| } | ||
|
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||
| @end |
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