async-profiler/src/engine.h at master · parca-dev/async-profiler · GitHub

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* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

* http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

#ifndef _ENGINE_H

#define _ENGINE_H

#include "arguments.h"

class Engine {

protected:

static volatile bool _enabled;

static bool updateCounter(volatile unsigned long long& counter, unsigned long long value, unsigned long long interval) {

if (interval <= 1) {

return true;

}

while (true) {

unsigned long long prev = counter;

unsigned long long next = prev + value;

if (next < interval) {

if (__sync_bool_compare_and_swap(&counter, prev, next)) {

return false;

}

} else {

if (__sync_bool_compare_and_swap(&counter, prev, next % interval)) {

return true;

}

public:

virtual const char* title() {

return "Flame Graph";

}

virtual const char* units() {

return "total";

}

virtual Error check(Arguments& args);

virtual Error start(Arguments& args);

virtual void stop();

void enableEvents(bool enabled) {

_enabled = enabled;

}

};

#endif // _ENGINE_H

async-profiler/src/engine.h at master · parca-dev/async-profiler · GitHub

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