locker.h

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#ifndef LOCKER_H
#define LOCKER_H

extern volatile int   gblMutex;
static const unsigned LockerChunk = 0x80;
static const unsigned LockerLimit = 0x8000;
class Locker {

  public:
    Locker () { cnt = 0; max = LockerChunk; };
    void        Fini    (void) {};
    void        lock    (void) {
      asm volatile ("cpsid i");
      gblMutex++;
    };
    void        unlock  (void) {
      if (--gblMutex) return;
      asm volatile ("cpsie i");
    };
    void       Reset    (void) {
      max = LockerChunk;
    };
    bool       NotDone  (void) {
      if (cnt++ < max)       return true;
      cnt  = 0;
      // Saturate max
      if (max > LockerLimit) return false;
      max += LockerChunk;
      return false;
    };
  private:      // ve fw nic
    unsigned cnt;
    unsigned max;
};

#endif // LOCKER_H