added Serial RNG - code compiles but not tested!

Hadrons/Environment.cc

@@ -84,6 +84,16 @@ GridParallelRNG * Environment::get4dRng(void)
     return rng4d_.get();
 }
 
+GridSerialRNG * Environment::getSerialRng(void)
+{
+    if (rngSerial_ == nullptr)
+    {
+        rngSerial_.reset(new GridSerialRNG());
+    }
+
+    return rngSerial_.get();
+}
+
 // general memory management ///////////////////////////////////////////////////
 void Environment::addObject(const std::string name, const int moduleAddress)
 {

Hadrons/Environment.hpp

@@ -74,6 +74,7 @@ public:
     typedef std::unique_ptr<GridCartesian>         GridPt;
     typedef std::unique_ptr<GridRedBlackCartesian> GridRbPt;
     typedef std::unique_ptr<GridParallelRNG>       RngPt;
+    typedef std::unique_ptr<GridSerialRNG>         SerialRngPt;
     enum class Storage {object, cache, temporary};
 private:
     struct ObjInfo
@@ -114,6 +115,7 @@ public:
     double                  getVolume(void) const;
     // random number generator
     GridParallelRNG *       get4dRng(void);
+    GridSerialRNG *         getSerialRng(void);
     // general memory management
     void                    addObject(const std::string name,
                                       const int moduleAddress = -1);
@@ -183,6 +185,7 @@ private:
     unsigned int                        nd_;
     // random number generator
     RngPt                               rng4d_{nullptr};
+    SerialRngPt                         rngSerial_{nullptr};
     // object store
     std::vector<ObjInfo>                object_;
     std::map<std::string, unsigned int> objectAddress_;

Hadrons/Module.cc

@@ -93,3 +93,18 @@ GridParallelRNG & ModuleBase::rng4d(void)
 
     return r;
 }
+
+GridSerialRNG & ModuleBase::rngSerial(void)
+{
+    auto &r = *env().getSerialRng();
+
+    if (makeSeedString() != seed_)
+    {
+        seed_ = makeSeedString();
+        LOG(Message) << "Seeding Serial RNG " << &r << " with string '" 
+                     << seed_ << "'" << std::endl;
+        r.SeedUniqueString(seed_);
+    }
+
+    return r;
+}

Hadrons/Module.hpp

@@ -1,7 +1,6 @@
 /*************************************************************************************
 
 Grid physics library, www.github.com/paboyle/Grid 
-
 Source file: Hadrons/Module.hpp
 
 Copyright (C) 2015-2019
@@ -196,6 +195,7 @@ protected:
     DEFINE_VM_ALIAS;
     // RNG seeded from module string
     GridParallelRNG &rng4d(void);
+    GridSerialRNG &rngSerial(void);
 private:
     std::string makeSeedString(void);
 private: