ctimer.h

/*
 * Copyright 2017 Andrei Pangin
 *
 * 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 _CTIMER_H
#define _CTIMER_H

#include "engine.h"
#include <atomic>
#ifdef __linux__

#include "arch.h"
#include <signal.h>

class CTimer : public Engine {
private:
  static std::atomic<bool> _enabled;
  static long _interval;
  static CStack _cstack;
  static int _signal;

  static int _max_timers;
  static int *_timers;

  int registerThread(int tid);
  void unregisterThread(int tid);

  // cppcheck-suppress unusedPrivateFunction
  static void signalHandler(int signo, siginfo_t *siginfo, void *ucontext);

public:
  const char *units() { return "ns"; }

  const char *name() { return "CTimer"; }

  long interval() const { return _interval; }

  Error check(Arguments &args);
  Error start(Arguments &args);
  void stop();

  inline void enableEvents(bool enabled) {
    _enabled.store(enabled, std::memory_order_release);
  }
};

#else

class CTimer : public Engine {
public:
  Error check(Arguments &args) {
    return Error("CTimer is not supported on this platform");
  }

  Error start(Arguments &args) {
    return Error("CTimer is not supported on this platform");
  }

  static bool supported() { return false; }
};

#endif // __linux__

#endif // _CTIMER_H