/data/refman/pasoursint/CMSSW_6_1_1/src/GeneratorInterface/Herwig6Interface/interface/Herwig6Instance.h

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#ifndef gen_Herwig6Instance_h
#define gen_Herwig6Instance_h

#include "GeneratorInterface/Core/interface/FortranInstance.h"

namespace CLHEP { class HepRandomEngine; } // forward declaration

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*);
}

class Herwig6Instance : public FortranInstance {
    public:
        Herwig6Instance(CLHEP::HepRandomEngine *randomEngine = 0);
        Herwig6Instance(int dummy);
        virtual ~Herwig6Instance();

        // 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);

    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
        void                    *timeoutPrivate;
};

} // namespace gen

#endif // gen_Herwig6Instance_h