| // This source file is part of the Swift.org open source project |
| // |
| // Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors |
| // Licensed under Apache License v2.0 with Runtime Library Exception |
| // |
| // See http://swift.org/LICENSE.txt for license information |
| // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors |
| // |
| // |
| // XCTimeUtilities.swift |
| // Some simple functions for working with "time intervals". |
| // |
| |
| #if os(Linux) |
| import Glibc |
| #else |
| import Darwin |
| #endif |
| |
| /// Returns the number of seconds since the reference time as a Double. |
| internal func currentTimeIntervalSinceReferenceTime() -> Double { |
| var tv = timeval() |
| let currentTime = withUnsafeMutablePointer(&tv, { (t: UnsafeMutablePointer<timeval>) -> Double in |
| gettimeofday(t, nil) |
| return Double(t.memory.tv_sec) + Double(t.memory.tv_usec) / 1000000.0 |
| }) |
| return currentTime |
| } |
| |
| /// Returns a string version of the given time interval rounded to no more than 3 decimal places. |
| internal func printableStringForTimeInterval(timeInterval: Double) -> String { |
| return String(round(timeInterval * 1000.0) / 1000.0) |
| } |
| |
