fix bug in propagation of parameters to combined solvers

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/sat/sat_config.cpp

@@ -35,6 +35,7 @@ namespace sat {
         m_glue("glue"),
         m_glue_psm("glue_psm"),
         m_psm_glue("psm_glue") {
+        m_num_parallel = 1;
         updt_params(p); 
     }
 

src/sat/sat_solver.cpp

@@ -804,7 +804,7 @@ namespace sat {
         sat::par par;
         symbol saved_phase = m_params.get_sym("phase", symbol("caching"));
         for (int i = 0; i < num_extra_solvers; ++i) {
-            m_params.set_uint("random_seed", i + m_config.m_random_seed);
+            m_params.set_uint("random_seed", m_rand());
             if (i == 1 + num_threads/2) {
                 m_params.set_sym("phase", symbol("random"));
             }                        
@@ -813,13 +813,13 @@ namespace sat {
             solvers[i]->set_par(&par);
             scoped_rlimit.push_child(&solvers[i]->rlimit());            
         }
+        set_par(&par);
         m_params.set_sym("phase", saved_phase);
         int finished_id = -1;
         std::string        ex_msg;
         par_exception_kind ex_kind;
         unsigned error_code = 0;
         lbool result = l_undef;
-        flet<unsigned> _overwrite_thread_number(m_config.m_num_parallel, 1);
         #pragma omp parallel for
         for (int i = 0; i < num_threads; ++i) {
             try {                
@@ -867,6 +867,7 @@ namespace sat {
                 }
             }
         }
+        set_par(0);
         if (finished_id != -1 && finished_id < num_extra_solvers) {
             m_stats = solvers[finished_id]->m_stats;
         }

src/solver/solver.h

@@ -54,7 +54,7 @@ public:
     /**
        \brief Update the solver internal settings. 
     */
-    virtual void updt_params(params_ref const & p) {}
+    virtual void updt_params(params_ref const & p) { }
 
     /**
        \brief Store in \c r a description of the configuration

src/solver/solver2tactic.cpp

@@ -93,6 +93,7 @@ public:
     {}
     
     virtual void updt_params(params_ref const & p) {
+        m_params.append(p);
         m_solver->updt_params(p);
     }
 

src/solver/tactic2solver.cpp

@@ -96,7 +96,7 @@ tactic2solver::~tactic2solver() {
 }
 
 void tactic2solver::updt_params(params_ref const & p) {
-    m_params = p;
+    m_params.append(p);
 }
 
 void tactic2solver::collect_param_descrs(param_descrs & r) {