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