Semaphore.h

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#ifndef SCHEDULER_SEMAPHORE_H
#define SCHEDULER_SEMAPHORE_H

#include <Scheduler.h>

class Semaphore {
public:
  Semaphore(unsigned int count = 1) : m_count(count) {}

  void wait(unsigned int count = 1)
  {
    await(m_count >= count);
    m_count -= count;
  }

  void signal(unsigned int count = 1)
  {
    m_count += count;
    Scheduler.yield();
  }

protected:
  volatile unsigned int m_count;
};

#endif