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 #ifndef SHARE_VM_UTILITIES_TICKS_HPP

    26 #define SHARE_VM_UTILITIES_TICKS_HPP

    27 

    28 #include "memory/allocation.hpp"

    29 #include "utilities/globalDefinitions.hpp"

    30 

    31 class Ticks;

    32 

    33 class Tickspan VALUE_OBJ_CLASS_SPEC {

    34   friend class Ticks;

    35   friend Tickspan operator-(const Ticks& end, const Ticks& start);

    36 

    37  private:

    38   jlong _span_ticks;

    39 

    40   Tickspan(const Ticks& end, const Ticks& start);

    41 

    42  public:

    43   Tickspan() : _span_ticks(0) {}

    44 

    45   Tickspan& operator+=(const Tickspan& rhs) {

    46     _span_ticks += rhs._span_ticks;

    47     return *this;

    48   }

    49 

    50   jlong value() const {

    51     return _span_ticks;

    52   }

    53 

    54 };

    55 

    56 class Ticks VALUE_OBJ_CLASS_SPEC {

    57  private:

    58   jlong _stamp_ticks;

    59 

    60  public:

    61   Ticks() : _stamp_ticks(0) {

    62     assert((_stamp_ticks = invalid_time_stamp) == invalid_time_stamp,

    63       "initial unstamped time value assignment");

    64   }

    65 

    66   Ticks& operator+=(const Tickspan& span) {

    67     _stamp_ticks += span.value();

    68     return *this;

    69   }

    70 

    71   Ticks& operator-=(const Tickspan& span) {

    72     _stamp_ticks -= span.value();

    73     return *this;

    74   }

    75 

    76   void stamp();

    77 

    78   jlong value() const {

    79     return _stamp_ticks;

    80   }

    81 

    82   static const Ticks now();

    83 

    84 #ifdef ASSERT

    85   static const jlong invalid_time_stamp;

    86 #endif

    87 

    88 #ifndef PRODUCT

    89   // only for internal use by GC VM tests

    90   friend class TimePartitionPhasesIteratorTest;

    91   friend class GCTimerTest;

    92 

    93  private:

    94   // implicit type conversion

    95   Ticks(int ticks) : _stamp_ticks(ticks) {}

    96 

    97 #endif // !PRODUCT

    98 

    99 };

   100 

   101 class TicksToTimeHelper : public AllStatic {

   102  public:

   103   enum Unit {

   104     SECONDS = 1,

   105     MILLISECONDS = 1000

   106   };

   107   static double seconds(const Tickspan& span);

   108   static jlong milliseconds(const Tickspan& span);

   109 };

   110 

   111 #endif // SHARE_VM_UTILITIES_TICKS_HPP