1 /* 2 * Copyright (c) 1997, 2018, 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 #ifndef SHARE_VM_RUNTIME_TIMER_HPP 26 #define SHARE_VM_RUNTIME_TIMER_HPP 27 28 #include "utilities/globalDefinitions.hpp" 29 30 // Timers for simple measurement. 31 32 class elapsedTimer { 33 friend class VMStructs; 34 private: 35 jlong _counter; 36 jlong _start_counter; 37 bool _active; 38 public: elapsedTimer()39 elapsedTimer() { _active = false; reset(); } 40 elapsedTimer(jlong time, jlong timeUnitsPerSecond); 41 void add(elapsedTimer t); 42 void start(); 43 void stop(); reset()44 void reset() { _counter = 0; } 45 double seconds() const; 46 jlong milliseconds() const; ticks() const47 jlong ticks() const { return _counter; } 48 jlong active_ticks() const; is_active() const49 bool is_active() const { return _active; } 50 }; 51 52 // TimeStamp is used for recording when an event took place. 53 class TimeStamp { 54 private: 55 jlong _counter; 56 public: TimeStamp()57 TimeStamp() { _counter = 0; } clear()58 void clear() { _counter = 0; } 59 // has the timestamp been updated since being created or cleared? is_updated() const60 bool is_updated() const { return _counter != 0; } 61 // update to current elapsed time 62 void update(); 63 // update to given elapsed time 64 void update_to(jlong ticks); 65 // returns seconds since updated 66 // (must not be in a cleared state: must have been previously updated) 67 double seconds() const; 68 jlong milliseconds() const; 69 // ticks elapsed between VM start and last update ticks() const70 jlong ticks() const { return _counter; } 71 // ticks elapsed since last update 72 jlong ticks_since_update() const; 73 }; 74 75 class TraceCPUTime: public StackObj { 76 private: 77 bool _active; // true if times will be measured and printed 78 bool _print_cr; // if true print carriage return at end 79 double _starting_user_time; // user time at start of measurement 80 double _starting_system_time; // system time at start of measurement 81 double _starting_real_time; // real time at start of measurement 82 outputStream* _logfile; // output is printed to this stream 83 bool _error; // true if an error occurred, turns off output 84 85 public: 86 TraceCPUTime(bool doit = true, 87 bool print_cr = true, 88 outputStream *logfile = NULL); 89 ~TraceCPUTime(); 90 }; 91 92 class TimeHelper { 93 public: 94 static double counter_to_seconds(jlong counter); 95 static double counter_to_millis(jlong counter); 96 static jlong millis_to_counter(jlong millis); 97 }; 98 99 #endif // SHARE_VM_RUNTIME_TIMER_HPP 100