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/*
* Copyright (c) 2013, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef SHARE_UTILITIES_TICKS_HPP
#define SHARE_UTILITIES_TICKS_HPP
#include "jni.h"
#include "memory/allocation.hpp"
#include "utilities/macros.hpp"
// Time sources
class ElapsedCounterSource {
public:
typedef jlong Type;
static uint64_t frequency();
static Type now();
static double seconds(Type value);
static uint64_t milliseconds(Type value);
static uint64_t microseconds(Type value);
static uint64_t nanoseconds(Type value);
};
// Not guaranteed to be synchronized across hardware threads and
// therefore software threads, and can be updated asynchronously
// by software. now() can jump backwards as well as jump forward
// when threads query different cores/sockets.
// Very much not recommended for general use. Caveat emptor.
class FastUnorderedElapsedCounterSource {
public:
typedef jlong Type;
static uint64_t frequency();
static Type now();
static double seconds(Type value);
static uint64_t milliseconds(Type value);
static uint64_t microseconds(Type value);
static uint64_t nanoseconds(Type value);
};
template <typename T1, typename T2>
class PairRep {
public:
T1 val1;
T2 val2;
PairRep() : val1((T1)0), val2((T2)0) {}
void operator+=(const PairRep& rhs) {
val1 += rhs.val1;
val2 += rhs.val2;
}
void operator-=(const PairRep& rhs) {
val1 -= rhs.val1;
val2 -= rhs.val2;
}
bool operator==(const PairRep& rhs) const {
return val1 == rhs.val1;
}
bool operator!=(const PairRep& rhs) const {
return !operator==(rhs);
}
bool operator<(const PairRep& rhs) const {
return val1 < rhs.val1;
}
bool operator>(const PairRep& rhs) const {
return val1 > rhs.val1;
}
};
template <typename T1, typename T2>
PairRep<T1, T2> operator-(const PairRep<T1, T2>& lhs, const PairRep<T1, T2>& rhs) {
PairRep<T1, T2> temp(lhs);
temp -= rhs;
return temp;
}
typedef PairRep<ElapsedCounterSource::Type, FastUnorderedElapsedCounterSource::Type> CompositeTime;
class CompositeElapsedCounterSource {
public:
typedef CompositeTime Type;
static uint64_t frequency();
static Type now();
static double seconds(Type value);
static uint64_t milliseconds(Type value);
static uint64_t microseconds(Type value);
static uint64_t nanoseconds(Type value);
};
template <typename TimeSource>
class Representation {
public:
typedef typename TimeSource::Type Type;
protected:
Type _rep;
Representation(const Representation<TimeSource>& end, const Representation<TimeSource>& start) : _rep(end._rep - start._rep) {}
Representation() : _rep() {}
public:
void operator+=(const Representation<TimeSource>& rhs) {
_rep += rhs._rep;
}
void operator-=(const Representation<TimeSource>& rhs) {
_rep -= rhs._rep;
}
bool operator==(const Representation<TimeSource>& rhs) const {
return _rep == rhs._rep;
}
bool operator!=(const Representation<TimeSource>& rhs) const {
return !operator==(rhs);
}
bool operator<(const Representation<TimeSource>& rhs) const {
return _rep < rhs._rep;
}
bool operator>(const Representation<TimeSource>& rhs) const {
return _rep > rhs._rep;
}
bool operator<=(const Representation<TimeSource>& rhs) const {
return !operator>(rhs);
}
bool operator>=(const Representation<TimeSource>& rhs) const {
return !operator<(rhs);
}
double seconds() const {
return TimeSource::seconds(_rep);
}
uint64_t milliseconds() const {
return TimeSource::milliseconds(_rep);
}
uint64_t microseconds() const {
return TimeSource::microseconds(_rep);
}
uint64_t nanoseconds() const {
return TimeSource::nanoseconds(_rep);
}
};
template <typename TimeSource>
class CounterRepresentation : public Representation<TimeSource> {
protected:
CounterRepresentation(const CounterRepresentation& end, const CounterRepresentation& start) : Representation<TimeSource>(end, start) {}
explicit CounterRepresentation(jlong value) : Representation<TimeSource>() {
this->_rep = value;
}
public:
CounterRepresentation() : Representation<TimeSource>() {}
typename TimeSource::Type value() const { return this->_rep; }
operator typename TimeSource::Type() { return value(); }
};
template <typename TimeSource>
class CompositeCounterRepresentation : public Representation<TimeSource> {
protected:
CompositeCounterRepresentation(const CompositeCounterRepresentation& end, const CompositeCounterRepresentation& start) :
Representation<TimeSource>(end, start) {}
explicit CompositeCounterRepresentation(jlong value) : Representation<TimeSource>() {
this->_rep.val1 = value;
this->_rep.val2 = value;
}
public:
CompositeCounterRepresentation() : Representation<TimeSource>() {}
ElapsedCounterSource::Type value() const { return this->_rep.val1; }
FastUnorderedElapsedCounterSource::Type ft_value() const { return this->_rep.val2; }
};
template <template <typename> class, typename>
class TimeInstant;
template <template <typename> class Rep, typename TimeSource>
class TimeInterval : public Rep<TimeSource> {
template <template <typename> class, typename>
friend class TimeInstant;
TimeInterval(const TimeInstant<Rep, TimeSource>& end, const TimeInstant<Rep, TimeSource>& start) : Rep<TimeSource>(end, start) {}
public:
TimeInterval() : Rep<TimeSource>() {}
TimeInterval<Rep, TimeSource> operator+(const TimeInterval<Rep, TimeSource>& rhs) const {
TimeInterval<Rep, TimeSource> temp(*this);
temp += rhs;
return temp;
}
TimeInterval<Rep, TimeSource> operator-(const TimeInterval<Rep, TimeSource>& rhs) const {
TimeInterval<Rep, TimeSource> temp(*this);
temp -= rhs;
return temp;
}
};
template <template <typename> class Rep, typename TimeSource>
class TimeInstant : public Rep<TimeSource> {
public:
TimeInstant() : Rep<TimeSource>() {}
TimeInstant<Rep, TimeSource>& operator+=(const TimeInterval<Rep, TimeSource>& rhs) {
Rep<TimeSource>::operator+=(rhs);
return *this;
}
TimeInstant<Rep, TimeSource>& operator-=(const TimeInterval<Rep, TimeSource>& rhs) {
Rep<TimeSource>::operator-=(rhs);
return *this;
}
TimeInterval<Rep, TimeSource> operator-(const TimeInstant<Rep, TimeSource>& start) const {
return TimeInterval<Rep, TimeSource>(*this, start);
}
void stamp() {
this->_rep = TimeSource::now();
}
static TimeInstant<Rep, TimeSource> now() {
TimeInstant<Rep, TimeSource> temp;
temp.stamp();
return temp;
}
private:
TimeInstant(jlong ticks) : Rep<TimeSource>(ticks) {}
friend class GranularTimer;
friend class ObjectSample;
friend class EventEmitter;
friend class JfrPeriodicEventSet;
// GC unit tests
friend class TimePartitionsTest;
friend class GCTimerTest;
friend class CompilerEvent;
};
#if INCLUDE_JFR
typedef TimeInstant<CompositeCounterRepresentation, CompositeElapsedCounterSource> Ticks;
typedef TimeInterval<CompositeCounterRepresentation, CompositeElapsedCounterSource> Tickspan;
#else
typedef TimeInstant<CounterRepresentation, ElapsedCounterSource> Ticks;
typedef TimeInterval<CounterRepresentation, ElapsedCounterSource> Tickspan;
#endif
#endif // SHARE_UTILITIES_TICKS_HPP
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