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annotate druntime/src/common/core/sync/config.d @ 1458:e0b2d67cfe7c

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Added druntime (this should be removed once it works).
author Robert Clipsham <robert@octarineparrot.com>
date Tue, 02 Jun 2009 17:43:06 +0100
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1458
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1 /**
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2 * The config module contains utility routines and configuration information
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3 * specific to this package.
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4 *
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5 * Copyright: Copyright Sean Kelly 2005 - 2009.
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6 * License: <a href="http://www.boost.org/LICENSE_1_0.txt>Boost License 1.0</a>.
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7 * Authors: Sean Kelly
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8 *
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9 * Copyright Sean Kelly 2005 - 2009.
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10 * Distributed under the Boost Software License, Version 1.0.
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11 * (See accompanying file LICENSE_1_0.txt or copy at
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12 * http://www.boost.org/LICENSE_1_0.txt)
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13 */
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14 module core.sync.config;
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15
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16
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17 version( Posix )
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18 {
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19 private import core.sys.posix.time;
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20 private import core.sys.posix.sys.time;
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21
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22
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23 void mktspec( inout timespec t, long delta = 0 )
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24 {
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25 static if( is( typeof( clock_gettime ) ) )
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26 {
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27 clock_gettime( CLOCK_REALTIME, &t );
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28 }
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29 else
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30 {
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31 timeval tv;
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32
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33 gettimeofday( &tv, null );
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34 (cast(byte*) &t)[0 .. t.sizeof] = 0;
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35 t.tv_sec = cast(typeof(t.tv_sec)) tv.tv_sec;
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36 t.tv_nsec = cast(typeof(t.tv_nsec)) tv.tv_usec * 1_000;
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37 }
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38 mvtspec( t, delta );
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39 }
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40
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41
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42 void mvtspec( inout timespec t, long delta )
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43 {
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44 if( delta == 0 )
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45 return;
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46
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47 enum : uint
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48 {
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49 NANOS_PER_TICK = 100,
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50 TICKS_PER_SECOND = 10_000_000,
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51 NANOS_PER_SECOND = NANOS_PER_TICK * TICKS_PER_SECOND,
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52 }
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53
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54 if( t.tv_sec.max - t.tv_sec < delta / TICKS_PER_SECOND )
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55 {
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56 t.tv_sec = t.tv_sec.max;
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57 t.tv_nsec = 0;
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58 }
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59 else
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60 {
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61 t.tv_sec += cast(typeof(t.tv_sec)) (delta / TICKS_PER_SECOND);
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62 long ns = (delta % TICKS_PER_SECOND) * NANOS_PER_TICK;
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63 if( NANOS_PER_SECOND - t.tv_nsec > ns )
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64 {
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65 t.tv_nsec = cast(typeof(t.tv_nsec)) ns;
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66 return;
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67 }
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68 t.tv_sec += 1;
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69 t.tv_nsec += cast(typeof(t.tv_nsec)) (ns - NANOS_PER_SECOND);
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70 }
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71 }
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72 }