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1 /* |
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 #include "precompiled.hpp" |
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26 #include "runtime/os.hpp" |
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27 #include "utilities/ticks.inline.hpp" |
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28 |
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29 #ifdef ASSERT |
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30 const jlong Ticks::invalid_time_stamp = -2; // 0xFFFF FFFF`FFFF FFFE |
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31 #endif |
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32 |
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33 void Ticks::stamp() { |
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34 _stamp_ticks = os::elapsed_counter(); |
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35 } |
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36 |
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37 const Ticks Ticks::now() { |
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38 Ticks t; |
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39 t.stamp(); |
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40 return t; |
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41 } |
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42 |
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43 Tickspan::Tickspan(const Ticks& end, const Ticks& start) { |
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44 assert(end.value() != Ticks::invalid_time_stamp, "end is unstamped!"); |
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45 assert(start.value() != Ticks::invalid_time_stamp, "start is unstamped!"); |
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46 |
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47 assert(end >= start, "negative time!"); |
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48 |
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49 _span_ticks = end.value() - start.value(); |
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50 } |
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51 |
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52 template <typename ReturnType> |
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53 static ReturnType time_conversion(const Tickspan& span, TicksToTimeHelper::Unit unit) { |
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54 assert(TicksToTimeHelper::SECONDS == unit || |
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55 TicksToTimeHelper::MILLISECONDS == unit, "invalid unit!"); |
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56 |
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57 ReturnType frequency_per_unit = (ReturnType)os::elapsed_frequency() / (ReturnType)unit; |
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58 |
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59 return (ReturnType) ((ReturnType)span.value() / frequency_per_unit); |
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60 } |
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61 |
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62 double TicksToTimeHelper::seconds(const Tickspan& span) { |
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63 return time_conversion<double>(span, SECONDS); |
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64 } |
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65 |
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66 jlong TicksToTimeHelper::milliseconds(const Tickspan& span) { |
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67 return time_conversion<jlong>(span, MILLISECONDS); |
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68 } |