Adding a callback feature to Satoko.

src/sat/satoko/solver.c

@@ -639,7 +639,7 @@ char solver_search(solver_t *s)
             /* No conflict */
             unsigned next_lit;
 
-            if (solver_rst(s) || solver_check_limits(s) == 0) {
+            if (solver_rst(s) || solver_check_limits(s) == 0 || solver_stop(s)) {
                 b_queue_clean(s->bq_lbd);
                 solver_cancel_until(s, 0);
                 return SATOKO_UNDEC;

src/sat/satoko/solver.h

@@ -102,6 +102,9 @@ struct solver_t_ {
 
     /* Temporary data used for solving cones */
     vec_char_t *marks;
+    
+    /* Callback to stop the solver */
+    int * pstop;
 
     struct satoko_stats stats;
     struct satoko_opts opts;
@@ -223,6 +226,14 @@ static inline int solver_has_marks(solver_t *s)
 {
     return (int)(s->marks != NULL);
 }
+static inline int solver_stop(solver_t *s)
+{
+    return s->pstop && *s->pstop;
+}
+static inline void solver_set_stop(solver_t *s, int * pstop)
+{
+    s->pstop = pstop;
+}
 
 //===------------------------------------------------------------------------===
 // Inline clause functions

src/sat/satoko/solver_api.c

@@ -303,7 +303,7 @@ int satoko_solve(solver_t *s)
 
     while (status == SATOKO_UNDEC) {
         status = solver_search(s);
-        if (solver_check_limits(s) == 0)
+        if (solver_check_limits(s) == 0 || solver_stop(s))
             break;
     }
     if (s->opts.verbose)