make REPAIR killable

myisam/mi_check.c

@@ -2587,6 +2587,9 @@ static int sort_get_next_record(MI_SORT_PARAM *sort_param)
   char llbuff[22],llbuff2[22];
   DBUG_ENTER("sort_get_next_record");
 
+  if (*killed_ptr(param))
+    DBUG_RETURN(1);
+
   switch (share->data_file_type) {
   case STATIC_RECORD:
     for (;;)

myisam/myisamchk.c

@@ -1636,6 +1636,10 @@ err:
   DBUG_RETURN(1);
 } /* sort_record_index */
 
+volatile bool *killed_ptr(MI_CHECK *param)
+{
+  return (bool *)(param->thd); /* always NULL */
+}
 
 	/* print warnings and errors */
 	/* VARARGS */

myisam/myisamdef.h

@@ -648,6 +648,7 @@ void mi_setup_functions(register MYISAM_SHARE *share);
 int _mi_init_bulk_insert(MI_INFO *info, ulong cache_size);
 
     /* Functions needed by mi_check */
+volatile bool *killed_ptr(MI_CHECK *param);
 void mi_check_print_error _VARARGS((MI_CHECK *param, const char *fmt,...));
 void mi_check_print_warning _VARARGS((MI_CHECK *param, const char *fmt,...));
 void mi_check_print_info _VARARGS((MI_CHECK *param, const char *fmt,...));

myisam/sort.c

@@ -701,6 +701,7 @@ merge_buffers(MI_SORT_PARAM *info, uint keys, IO_CACHE *from_file,
   uchar *strpos;
   BUFFPEK *buffpek,**refpek;
   QUEUE queue;
+  volatile bool *killed= killed_ptr(info->sort_info->param);
   DBUG_ENTER("merge_buffers");
 
   count=error=0;
@@ -732,6 +733,10 @@ merge_buffers(MI_SORT_PARAM *info, uint keys, IO_CACHE *from_file,
   {
     for (;;)
     {
+      if (*killed)
+      {
+        error=1; goto err;
+      }
       buffpek=(BUFFPEK*) queue_top(&queue);
       if (to_file)
       {

sql/ha_myisam.cc

@@ -87,6 +87,11 @@ static void mi_check_print_msg(MI_CHECK *param,	const char* msg_type,
 
 extern "C" {
 
+volatile bool *killed_ptr(MI_CHECK *param)
+{
+  return &(((THD *)(param->thd))->killed);
+}
+
 void mi_check_print_error(MI_CHECK *param, const char *fmt,...)
 {
   param->error_printed|=1;