/data/refman/pasoursint/CMSSW_4_1_8_patch13/src/GeneratorInterface/Herwig6Interface/src/Herwig6Instance.cc

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#include <iostream>
#include <sstream>
#include <cstdlib>
#include <cstring>
#include <cctype>
#include <string>

#ifdef _POSIX_C_SOURCE
#       include <sys/time.h>
#       include <signal.h>
#       include <setjmp.h>
#endif

#include <CLHEP/Random/RandomEngine.h>

#include <HepMC/HerwigWrapper6_4.h>

#include "FWCore/Utilities/interface/Exception.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

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

#include "GeneratorInterface/Herwig6Interface/interface/herwig.h"
#include "GeneratorInterface/Herwig6Interface/interface/Herwig6Instance.h"

#include "params.inc"

using namespace gen;

// implementation for the Fortran callbacks from Herwig

// this gets a random number from the currently running instance
// so, if the have separate instances for let's say decayers based on
// Herwig than the Herwig pp collision instance, we get independent
// random numbers.  Also true for FastSim, since FastSim uses its own
// random numbers.  This means FastSim needs take a Herwig6Instance
// instance of its own instead of calling into Herwig directly.
double gen::hwrgen_(int *idummy)
{ return FortranInstance::getInstance<Herwig6Instance>()->randomEngine->flat(); }

void gen::cms_hwwarn_(char fn[6], int *code, int *exit)
{
        std::string function(fn, fn + sizeof fn);
        *exit = FortranInstance::getInstance<Herwig6Instance>()->hwwarn(function, *code);
}

extern "C" {
        void hwaend_()
        {}

        void cmsending_(int *ecode)
        {
                throw cms::Exception("Herwig6Error")
                        << "Herwig6 stopped run with error code " << *ecode
                        << "." << std::endl;
        }
}

// Herwig6Instance methods

Herwig6Instance::Herwig6Instance(CLHEP::HepRandomEngine *randomEngine) :
        randomEngine(randomEngine ? randomEngine : &getEngineReference()),
        timeoutPrivate(0)
{
}

Herwig6Instance::Herwig6Instance(int dummy) :
        randomEngine(0),
        timeoutPrivate(0)
{
}

Herwig6Instance::~Herwig6Instance()
{
}

// timeout tool

#ifdef _POSIX_C_SOURCE
// some deep POSIX hackery to catch HERWIG sometimes (O(10k events) with
// complicated topologies) getting caught in and endless loop :-(

void Herwig6Instance::_timeout_sighandler(int signr)
{ siglongjmp(*(sigjmp_buf*)FortranInstance::getInstance<Herwig6Instance>()->timeoutPrivate, 1); }

bool Herwig6Instance::timeout(unsigned int secs, void (*fn)())
{
        if (timeoutPrivate)
                throw cms::Exception("ReentrancyProblem")
                        << "Herwig6Instance::timeout() called recursively."
                        << std::endl;
        struct sigaction saOld;
        std::memset(&saOld, 0, sizeof saOld);

        struct itimerval itv;
        timerclear(&itv.it_value);
        timerclear(&itv.it_interval);
        itv.it_value.tv_sec = 0;
        itv.it_interval.tv_sec = 0;
        setitimer(ITIMER_VIRTUAL, &itv, NULL);

        sigset_t ss;
        sigemptyset(&ss);
        sigaddset(&ss, SIGVTALRM);

        sigprocmask(SIG_UNBLOCK, &ss, NULL);
        sigprocmask(SIG_BLOCK, &ss, NULL);

        timeoutPrivate = new sigjmp_buf;
        if (sigsetjmp(*(sigjmp_buf*)timeoutPrivate, 1)) {
                delete (sigjmp_buf*)timeoutPrivate;
                timeoutPrivate = 0;

                itv.it_value.tv_sec = 0;
                itv.it_interval.tv_sec = 0;
                setitimer(ITIMER_VIRTUAL, &itv, NULL);
                sigprocmask(SIG_UNBLOCK, &ss, NULL);
                return true;
        }

        itv.it_value.tv_sec = secs;
        itv.it_interval.tv_sec = secs;
        setitimer(ITIMER_VIRTUAL, &itv, NULL);

        struct sigaction sa;
        std::memset(&sa, 0, sizeof sa);
        sa.sa_handler = &Herwig6Instance::_timeout_sighandler;
        sa.sa_flags = SA_ONESHOT;
        sigemptyset(&sa.sa_mask);

        sigaction(SIGVTALRM, &sa, &saOld);
        sigprocmask(SIG_UNBLOCK, &ss, NULL);

        try {
                fn();
        } catch(...) {
                delete (sigjmp_buf*)timeoutPrivate;
                timeoutPrivate = 0;

                itv.it_value.tv_sec = 0;
                itv.it_interval.tv_sec = 0;
                setitimer(ITIMER_VIRTUAL, &itv, NULL);

                sigaction(SIGVTALRM, &saOld, NULL);

                throw;
        }

        delete (sigjmp_buf*)timeoutPrivate;
        timeoutPrivate = 0;

        itv.it_value.tv_sec = 0;
        itv.it_interval.tv_sec = 0;
        setitimer(ITIMER_VIRTUAL, &itv, NULL);

        sigaction(SIGVTALRM, &saOld, NULL);

        return false;
}
#else
bool Herwig6Instance::timeout(unsigned int secs, void (*fn)())
{
        fn();
        return false;
}
#endif

bool Herwig6Instance::hwwarn(const std::string &fn, int code)
{
        return false;
}

// regular Herwig6Instance methods

bool Herwig6Instance::give(const std::string &line)
{       
        typedef std::istringstream::traits_type traits;

        const char *p = line.c_str(), *q;
        p += std::strspn(p, " \t\r\n");

        for(q = p; std::isalnum(*q); q++);
        std::string name(p, q - p);

        const ConfigParam *param;
        for(param = configParams; param->name; param++)
                if (name == param->name)
                        break;
        if (!param->name)
                return false;

        p = q + std::strspn(q, " \t\r\n");  

        std::size_t pos = 0;
        std::size_t mult = 1;
        for(unsigned int i = 0; i < 3; i++) {
                if (!param->dim[i].size)
                        break;

                if (*p++ != (i ? ',' : '('))
                        return false;

                p += std::strspn(p, " \t\r\n");

                for(q = p; std::isdigit(*q); q++);
                std::istringstream ss(std::string(p, q - p));
                std::size_t index;
                ss >> index;
                if (ss.bad() || ss.peek() != traits::eof())
                        return false;

                if (index < param->dim[i].offset)
                        return false;
                index -= param->dim[i].offset;
                if (index >= param->dim[i].size)
                        return false;

                p = q + std::strspn(q, " \t\r\n");

                pos += mult * index;
                mult *= param->dim[i].size;
        }

        if (param->dim[0].size) {
                if (*p++ != ')')
                        return false;
                p += std::strspn(p, " \t\r\n");
        }

        if (*p++ != '=')
                return false;
        p += std::strspn(p, " \t\r\n");

        for(q = p; *q && (std::isalnum(*q) || std::strchr(".-+", *q)); q++);
        std::istringstream ss(std::string(p, q - p));

        p = q + std::strspn(q, " \t\r\n");
        if (*p && *p != '!')
                return false;

        switch(param->type) {
            case kInt: {
                int value;
                ss >> value;
                if (ss.bad() || ss.peek() != traits::eof())
                        return false;

                ((int*)param->ptr)[pos] = value;
                break;
            }
            case kDouble: {
                double value;
                ss >> value;
                if (ss.bad() || ss.peek() != traits::eof())
                        return false;

                ((double*)param->ptr)[pos] = value;
                break;
            }
            case kLogical: {
                std::string value_;
                ss >> value_;
                if (ss.bad() || ss.peek() != traits::eof())
                        return false;

                for(std::string::iterator iter = value_.begin();
                    iter != value_.end(); ++iter)
                        *iter = std::tolower(*iter);
                bool value;
                if (value_ == "yes" || value_ == "true" || value_ == "1")
                        value = true;
                else if (value_ == "no" || value_ == "false" || value_ == "0")
                        value = false;
                else
                        return false;

                ((int*)param->ptr)[pos] = value;
                break;
            }
        }

        return true;
}