Herwig6Instance.h

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#ifndef gen_Herwig6Instance_h
#define gen_Herwig6Instance_h

#include "GeneratorInterface/Core/interface/FortranInstance.h"
#include <memory>

namespace CLHEP {
    class HepRandomEngine;
}

namespace gen {

// the callbacks from Herwig which are passed on to the Herwig6Instance
extern "C" {
    double hwrgen_(int*);
    void cms_hwwarn_(char fn[6], int*, int*);
}

//Forward declare here to avoid system dependency
struct TimeoutHolder;

class Herwig6Instance : public FortranInstance {
    public:
    Herwig6Instance();
    ~Herwig6Instance() override;

    // passes a configuration parameter
    bool give(const std::string &line);

    bool callWithTimeout(unsigned int secs, void (*fn)())
    { InstanceWrapper wrapper(this); return timeout(secs, fn); }

        // method to open External Particle Spectra Files
        void openParticleSpecFile(const std::string fileName);

         void setHerwigRandomEngine(CLHEP::HepRandomEngine* v) { randomEngine = v; }

    protected:
    // intercept HERWIG warnings and errors (default: no)
        virtual bool hwwarn(const std::string &fn, int code);

    private:
    // list all the Fortran callbacks here
    friend double gen::hwrgen_(int*);
    friend void gen::cms_hwwarn_(char fn[6], int*, int*);

    // call with timeout
    bool timeout(unsigned int secs, void (*fn)());

    // used from timeout
    static void _timeout_sighandler(int signr);

    // the random engine
    // in order to make sure no one else uses this engine
    // the access is only possible if pyr_ is called after
    // the current instance has been selected using enter()
    // if Herwig is called without an active instance and does
    // either a callback or requests a random number an
    // an exception will be thrown
    CLHEP::HepRandomEngine  *randomEngine;

    // for timeout facility
        std::unique_ptr<TimeoutHolder> timeoutPrivate;
};

} // namespace gen

#endif // gen_Herwig6Instance_h