Fix for bug #809849 spatial operations must be KILL-able.

  Checks for thd->killed state added to the long loops in geometry calculations.

per-file comments:
  sql/gcalc_slicescan.cc
Fix for bug #809849 spatial operations must be KILL-able.
        checks for TERMINATED_STATE added.
  sql/gcalc_slicescan.h
Fix for bug #809849 spatial operations must be KILL-able.
        defines added to include checks for termination in the
        library.
  sql/gcalc_tools.cc
Fix for bug #809849 spatial operations must be KILL-able.
        checks for TERMINATED_STATE added.
  sql/gcalc_tools.h
Fix for bug #809849 spatial operations must be KILL-able.
        TERMINATED_STATE pointers added.
  sql/item_geofunc.cc
Fix for bug #809849 spatial operations must be KILL-able.
  sql/item_geofunc.h
Fix for bug #809849 spatial operations must be KILL-able.

sql/gcalc_slicescan.cc

@@ -1078,6 +1078,7 @@ void Gcalc_scan_iterator::init(Gcalc_heap *points)
 #ifndef GCALC_DBUG_OFF
   m_cur_thread= 0;
 #endif /*GCALC_DBUG_OFF*/
+  GCALC_SET_TERMINATED(killed, 0);
 }
 
 void Gcalc_scan_iterator::reset()
@@ -1263,6 +1264,9 @@ int Gcalc_scan_iterator::step()
   GCALC_DBUG_ENTER("Gcalc_scan_iterator::step");
   GCALC_DBUG_ASSERT(more_points());
 
+  if (GCALC_TERMINATED(killed))
+    GCALC_DBUG_RETURN(0xFFFF);
+
   /* Clear the old event marks. */
   if (m_bottom_points)
   {

sql/gcalc_slicescan.h

@@ -38,6 +38,11 @@
 #define GCALC_DBUG_ASSERT(r)    do {} while(0)
 #endif /*GCALC_DBUG_OFF*/
 
+#define GCALC_TERMINATED(state_var) (state_var && (*state_var))
+#define GCALC_SET_TERMINATED(state_var, val) state_var= val
+#define GCALC_DECL_TERMINATED_STATE(varname) \
+  volatile int *varname;
+
 /*
   Gcalc_dyn_list class designed to manage long lists of same-size objects
   with the possible efficiency.
@@ -448,6 +453,8 @@ class Gcalc_scan_iterator : public Gcalc_dyn_list
 public:
   Gcalc_scan_iterator(size_t blk_size= 8192);
 
+  GCALC_DECL_TERMINATED_STATE(killed)
+
   void init(Gcalc_heap *points); /* Iterator can be reused */
   void reset();
   int step();

sql/gcalc_tools.cc

@@ -637,6 +637,7 @@ void Gcalc_operation_reducer::init(Gcalc_function *fn, modes mode)
   m_lines_hook= (Gcalc_dyn_list::Item **) &m_lines;
   m_poly_borders= NULL;
   m_poly_borders_hook= (Gcalc_dyn_list::Item **) &m_poly_borders;
+  GCALC_SET_TERMINATED(killed, 0);
 }
 
 
@@ -1218,6 +1219,7 @@ int Gcalc_operation_reducer::count_all(Gcalc_heap *hp)
   Gcalc_scan_iterator si;
   GCALC_DBUG_ENTER("Gcalc_operation_reducer::count_all");
   si.init(hp);
+  GCALC_SET_TERMINATED(si.killed, killed);
   while (si.more_points())
   {
     if (si.step())

sql/gcalc_tools.h

@@ -218,6 +218,7 @@ class Gcalc_operation_reducer : public Gcalc_dyn_list
   void init(Gcalc_function *fn, modes mode= default_mode);
   Gcalc_operation_reducer(Gcalc_function *fn, modes mode= default_mode,
 		       size_t blk_size=8192);
+  GCALC_DECL_TERMINATED_STATE(killed)
   int count_slice(Gcalc_scan_iterator *si);
   int count_all(Gcalc_heap *hp);
   int get_result(Gcalc_result_receiver *storage);

sql/item_geofunc.cc

@@ -896,6 +896,8 @@ longlong Item_func_spatial_rel::val_int()
 
   collector.prepare_operation();
   scan_it.init(&collector);
+  scan_it.killed= (int *) &(current_thd->killed);
+
 #ifdef TMP_BLOCK
   if (spatial_rel == SP_EQUALS_FUNC)
   {
@@ -950,7 +952,6 @@ String *Item_func_spatial_operation::val_str(String *str_value)
 
   
   collector.prepare_operation();
-  scan_it.init(&collector);
   if (func.alloc_states())
     goto exit;
 
@@ -973,7 +974,6 @@ String *Item_func_spatial_operation::val_str(String *str_value)
 exit:
   collector.reset();
   func.reset();
-  scan_it.reset();
   res_receiver.reset();
   DBUG_RETURN(str_value);
 }
@@ -1399,6 +1399,7 @@ String *Item_func_buffer::val_str(String *str_value)
   if (func.alloc_states())
     goto mem_error;
   operation.init(&func);
+  operation.killed= (int *) &(current_thd->killed);
 
   if (operation.count_all(&collector) ||
       operation.get_result(&res_receiver))
@@ -1419,7 +1420,6 @@ String *Item_func_buffer::val_str(String *str_value)
 mem_error:
   collector.reset();
   func.reset();
-  scan_it.reset();
   res_receiver.reset();
   DBUG_RETURN(str_result);
 }

sql/item_geofunc.h

@@ -266,7 +266,6 @@ class Item_func_spatial_operation: public Item_geometry_func
   Gcalc_function::op_type spatial_op;
   Gcalc_heap collector;
   Gcalc_function func;
-  Gcalc_scan_iterator scan_it;
 
   Gcalc_result_receiver res_receiver;
   Gcalc_operation_reducer operation;
@@ -323,7 +322,6 @@ class Item_func_buffer: public Item_geometry_func
   };
   Gcalc_heap collector;
   Gcalc_function func;
-  Gcalc_scan_iterator scan_it;
 
   Gcalc_result_receiver res_receiver;
   Gcalc_operation_reducer operation;