Merge work:/home/bk/mysql-4.0/

into rhols221.adsl.netsonic.fi:/home/my/bk/mysql-4.0-new

Merge work:/home/bk/mysql-4.0/
into rhols221.adsl.netsonic.fi:/home/my/bk/mysql-4.0-new
b3d57979 · jani@rhols221.adsl.netsonic.fi · daaf9b1a · 7cad1f93 · b3d57979 · b3d57979
Commit b3d57979 authored Jul 01, 2002 by jani@rhols221.adsl.netsonic.fi
21 changed files
--- a/include/mysql_com.h
+++ b/include/mysql_com.h
@@ -164,9 +164,6 @@ enum enum_field_types { FIELD_TYPE_DECIMAL, FIELD_TYPE_TINY,
 extern "C" {
 #endif
-extern unsigned long max_allowed_packet;
-extern unsigned long net_buffer_length;
 int	my_net_init(NET *net, Vio* vio);
 void	net_end(NET *net);
 void	net_clear(NET *net);
@@ -225,6 +222,9 @@ typedef struct st_udf_init
 extern "C" {
 #endif
+extern unsigned long max_allowed_packet;
+extern unsigned long net_buffer_length;
 void randominit(struct rand_struct *,unsigned long seed1,
 		unsigned long seed2);
 double rnd(struct rand_struct *);

--- a/libmysqld/lib_sql.cc
+++ b/libmysqld/lib_sql.cc
@@ -220,7 +220,7 @@ check_connections2(THD * thd)
  if (thd->client_capabilities & CLIENT_CONNECT_WITH_DB)
    db=strend(passwd)+1;
  if (thd->client_capabilities & CLIENT_INTERACTIVE)
-    thd->inactive_timeout=net_interactive_timeout;
+    thd->inactive_timeout= thd->variables.net_interactive_timeout;
  if (thd->client_capabilities & CLIENT_TRANSACTIONS)
    thd->net.return_status= &thd->server_status;
  net->timeout=net_read_timeout;

--- a/mysys/my_getopt.c
+++ b/mysys/my_getopt.c
@@ -620,32 +620,32 @@ static void init_variables(const struct my_option *options)
    {
      switch (options->var_type) {
      case GET_BOOL:
-	*((my_bool*) options->u_max_value)= *((my_bool*) options->value)=
+	*((my_bool*) options->u_max_value)= (my_bool) options->max_value;
-	  (my_bool) options->def_value;
+	*((my_bool*) options->value)= (my_bool) options->def_value;
 	break;
      case GET_INT:
-	*((int*) options->u_max_value)= *((int*) options->value)=
+	*((int*) options->u_max_value)= (int) options->max_value;
-	  (int) options->def_value;
+	*((int*) options->value)= (int) options->def_value;
 	break;
      case GET_UINT:
-	*((uint*) options->u_max_value)= *((uint*) options->value)=
+	*((uint*) options->u_max_value)= (uint) options->max_value;
-	  (uint) options->def_value;
+	*((uint*) options->value)= (uint) options->def_value;
 	break;
      case GET_LONG:
-	*((long*) options->u_max_value)= *((long*) options->value)=
+	*((long*) options->u_max_value)= (long) options->max_value;
-	  (long) options->def_value;
+	*((long*) options->value)= (long) options->def_value;
 	break;
      case GET_ULONG:
-	*((ulong*) options->u_max_value)= *((ulong*) options->value)=
+	*((ulong*) options->u_max_value)= (ulong) options->max_value;
-	  (ulong) options->def_value;
+	*((ulong*) options->value)= (ulong) options->def_value;
 	break;
      case GET_LL:
-	*((longlong*) options->u_max_value)= *((longlong*) options->value)=
+	*((longlong*) options->u_max_value)= (longlong) options->max_value;
-	  (longlong) options->def_value;
+	*((longlong*) options->value)= (longlong) options->def_value;
 	break;
      case GET_ULL:
-	*((ulonglong*) options->u_max_value)= *((ulonglong*) options->value)=
+	*((ulonglong*) options->u_max_value)= (ulonglong) options->max_value;
-	  (ulonglong) options->def_value;
+	*((ulonglong*) options->value)=  (ulonglong) options->def_value;
 	break;
      default: /* dummy default to avoid compiler warnings */
 	break;

--- a/sql/filesort.cc
+++ b/sql/filesort.cc
@@ -75,6 +75,8 @@ ha_rows filesort(TABLE *table, SORT_FIELD *sortorder, uint s_length,
  uchar **sort_keys;
  IO_CACHE tempfile, buffpek_pointers, *selected_records_file, *outfile; 
  SORTPARAM param;
+  THD *thd= current_thd;
  DBUG_ENTER("filesort");
  DBUG_EXECUTE("info",TEST_filesort(sortorder,s_length,special););
 #ifdef SKIP_DBUG_IN_FILESORT
@@ -134,7 +136,7 @@ ha_rows filesort(TABLE *table, SORT_FIELD *sortorder, uint s_length,
    goto err;
 #endif
-  memavl=sortbuff_size;
+  memavl= thd->variables.sortbuff_size;
  while (memavl >= MIN_SORT_MEMORY)
  {
    ulong old_memavl;
@@ -149,7 +151,8 @@ ha_rows filesort(TABLE *table, SORT_FIELD *sortorder, uint s_length,
  }
  if (memavl < MIN_SORT_MEMORY)
  {
-    my_error(ER_OUTOFMEMORY,MYF(ME_ERROR+ME_WAITTANG),sortbuff_size);
+    my_error(ER_OUTOFMEMORY,MYF(ME_ERROR+ME_WAITTANG),
+	     thd->variables.sortbuff_size);
    goto err;
  }
  if (open_cached_file(&buffpek_pointers,mysql_tmpdir,TEMP_PREFIX,
@@ -909,6 +912,7 @@ static uint
 sortlength(SORT_FIELD *sortorder, uint s_length)
 {
  reg2 uint length;
+  THD *thd= current_thd;
  length=0;
  for (; s_length-- ; sortorder++)
@@ -916,7 +920,7 @@ sortlength(SORT_FIELD *sortorder, uint s_length)
    if (sortorder->field)
    {
      if (sortorder->field->type() == FIELD_TYPE_BLOB)
-	sortorder->length=max_item_sort_length;
+	sortorder->length= thd->variables.max_item_sort_length;
      else
      {
 	sortorder->length=sortorder->field->pack_length();
@@ -952,7 +956,7 @@ sortlength(SORT_FIELD *sortorder, uint s_length)
      if (sortorder->item->maybe_null)
 	length++;				// Place for NULL marker
    }
-    set_if_smaller(sortorder->length,max_item_sort_length);
+    set_if_smaller(sortorder->length, thd->variables.max_item_sort_length);
    length+=sortorder->length;
  }
  sortorder->field= (Field*) 0;			// end marker

--- a/sql/ha_heap.cc
+++ b/sql/ha_heap.cc
@@ -37,6 +37,7 @@ int ha_heap::open(const char *name, int mode, uint test_if_locked)
  ulong max_rows;
  HP_KEYDEF *keydef;
  HP_KEYSEG *seg;
+  THD *thd= current_thd;
  for (key=parts=0 ; key < table->keys ; key++)
    parts+=table->key_info[key].key_parts;
@@ -83,7 +84,7 @@ int ha_heap::open(const char *name, int mode, uint test_if_locked)
    }
  }
  mem_per_row += MY_ALIGN(table->reclength+1, sizeof(char*));
-  max_rows = (ulong) (max_heap_table_size / mem_per_row);
+  max_rows = (ulong) (thd->variables.max_heap_table_size / mem_per_row);
  file=heap_open(name,mode,
 		 table->keys,keydef,
 		 table->reclength,

--- a/sql/item_sum.cc
+++ b/sql/item_sum.cc
@@ -1040,7 +1040,8 @@ bool Item_sum_count_distinct::setup(THD *thd)
      }
    }
-    init_tree(&tree, min(max_heap_table_size, sortbuff_size/16), 0,
+    init_tree(&tree, min(thd->variables.max_heap_table_size,
+			 thd->variables.sortbuff_size/16), 0,
 	      key_length, compare_key, 0, NULL, cmp_arg);
    use_tree = 1;
@@ -1050,8 +1051,8 @@ bool Item_sum_count_distinct::setup(THD *thd)
      but this has to be handled - otherwise someone can crash
      the server with a DoS attack
    */
-    max_elements_in_tree = ((key_length) ? max_heap_table_size/key_length :
+    max_elements_in_tree = ((key_length) ? 
-			    1);
+			    thd->variables.max_heap_table_size/key_length : 1);
  }
  return 0;
 }

--- a/sql/mysql_priv.h
+++ b/sql/mysql_priv.h
@@ -468,7 +468,8 @@ int mysqld_show_create(THD *thd, TABLE_LIST *table_list);
 void mysqld_list_processes(THD *thd,const char *user,bool verbose);
 int mysqld_show_status(THD *thd);
 int mysqld_show_variables(THD *thd,const char *wild);
-int mysqld_show(THD *thd, const char *wild, show_var_st *variables);
+int mysqld_show(THD *thd, const char *wild, show_var_st *variables,
+		struct system_variables *variable_values);
 /* sql_handler.cc */
 int mysql_ha_open(THD *thd, TABLE_LIST *tables);
@@ -550,8 +551,6 @@ int write_record(TABLE *table,COPY_INFO *info);
 extern ulong volatile manager_status;
 extern bool volatile manager_thread_in_use, mqh_used;
 extern pthread_t manager_thread;
-extern pthread_mutex_t LOCK_manager;
-extern pthread_cond_t COND_manager;
 pthread_handler_decl(handle_manager, arg);
 /* sql_test.cc */
@@ -611,12 +610,13 @@ extern pthread_mutex_t LOCK_mysql_create_db,LOCK_Acl,LOCK_open,
       LOCK_thread_count,LOCK_mapped_file,LOCK_user_locks, LOCK_status,
       LOCK_grant, LOCK_error_log, LOCK_delayed_insert,
       LOCK_delayed_status, LOCK_delayed_create, LOCK_crypt, LOCK_timezone,
-       LOCK_server_id, LOCK_slave_list, LOCK_active_mi;
+       LOCK_server_id, LOCK_slave_list, LOCK_active_mi, LOCK_manager,
-extern pthread_cond_t COND_refresh,COND_thread_count;
+       LOCK_global_system_variables;
+extern pthread_cond_t COND_refresh, COND_thread_count, COND_manager;
 extern pthread_attr_t connection_attrib;
 extern bool opt_endinfo, using_udf_functions, locked_in_memory,
            opt_using_transactions, use_temp_pool, mysql_embedded;
-extern my_bool opt_local_infile;
 extern char f_fyllchar;
 extern ulong ha_read_count, ha_write_count, ha_delete_count, ha_update_count,
 	     ha_read_key_count, ha_read_next_count, ha_read_prev_count,
@@ -628,27 +628,27 @@ extern uchar *days_in_month;
 extern DATE_FORMAT dayord;
 extern double log_10[32];
 extern uint protocol_version,dropping_tables;
-extern ulong keybuff_size,sortbuff_size,max_item_sort_length,table_cache_size,
+extern ulong keybuff_size,table_cache_size,
-	     max_join_size,join_buff_size,tmp_table_size,
+	     max_connections,max_connect_errors,
-	     max_connections,max_connect_errors,long_query_time,
 	     max_insert_delayed_threads, max_user_connections,
-	     long_query_count,net_wait_timeout,net_interactive_timeout,
+	     long_query_count,
-	     net_read_timeout,net_write_timeout,
+             net_read_timeout,net_write_timeout,
 	     what_to_log,flush_time,opt_sql_mode,
-	     max_tmp_tables,max_heap_table_size,query_buff_size,
+	     query_buff_size, lower_case_table_names,
-	     lower_case_table_names,thread_stack,thread_stack_min,
+	     thread_stack,thread_stack_min,
-	     binlog_cache_size, max_binlog_cache_size, record_rnd_cache_size;
+	     binlog_cache_size, max_binlog_cache_size;
 extern ulong com_stat[(uint) SQLCOM_END], com_other;
 extern ulong specialflag, current_pid;
 extern bool low_priority_updates, using_update_log;
-extern bool opt_sql_bin_update, opt_safe_show_db, opt_warnings,
+extern bool opt_sql_bin_update, opt_safe_show_db,
-					     opt_safe_user_create, opt_no_mix_types;
+	    opt_safe_user_create, opt_no_mix_types;
 extern char language[LIBLEN],reg_ext[FN_EXTLEN],blob_newline;
 extern const char **errmesg;			/* Error messages */
 extern const char *default_tx_isolation_name;
 extern String empty_string;
 extern struct show_var_st init_vars[];
 extern struct show_var_st status_vars[];
+extern struct system_variables global_system_variables;
 extern enum db_type default_table_type;
 extern enum enum_tx_isolation default_tx_isolation;
 extern char glob_hostname[FN_REFLEN];

--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -299,13 +299,15 @@ uint volatile thread_count=0, thread_running=0, kill_cached_threads=0,
 ulong thd_startup_options=(OPTION_UPDATE_LOG | OPTION_AUTO_IS_NULL |
 			   OPTION_BIN_LOG | OPTION_QUOTE_SHOW_CREATE );
 uint protocol_version=PROTOCOL_VERSION;
-ulong keybuff_size,sortbuff_size,max_item_sort_length,table_cache_size,
+struct system_variables global_system_variables;
-      max_join_size,join_buff_size,tmp_table_size,thread_stack,
+struct system_variables max_system_variables;
-      thread_stack_min,net_wait_timeout,what_to_log= ~ (1L << (uint) COM_TIME),
+ulong keybuff_size,table_cache_size,
+      thread_stack,
+      thread_stack_min,what_to_log= ~ (1L << (uint) COM_TIME),
      query_buff_size, lower_case_table_names, mysqld_net_retry_count,
-      net_interactive_timeout, slow_launch_time = 2L,
+      slow_launch_time = 2L,
      net_read_timeout,net_write_timeout,slave_open_temp_tables=0,
-      open_files_limit=0, max_binlog_size, record_rnd_cache_size;
+      open_files_limit=0, max_binlog_size;
 ulong com_stat[(uint) SQLCOM_END], com_other;
 ulong slave_net_timeout;
 ulong thread_cache_size=0, binlog_cache_size=0, max_binlog_cache_size=0;
@@ -330,16 +332,15 @@ uint master_port = MYSQL_PORT, master_connect_retry = 60;
 uint report_port = MYSQL_PORT;
 bool master_ssl = 0;
-ulong max_tmp_tables,max_heap_table_size,master_retry_count=0;
+ulong master_retry_count=0;
 ulong bytes_sent = 0L, bytes_received = 0L;
 bool opt_endinfo,using_udf_functions,low_priority_updates, locked_in_memory;
-bool opt_using_transactions, using_update_log, opt_warnings=0;
+bool opt_using_transactions, using_update_log;
-my_bool opt_local_infile=1;
 bool volatile abort_loop,select_thread_in_use,grant_option;
 bool volatile ready_to_exit,shutdown_in_progress;
 ulong refresh_version=1L,flush_version=1L;	/* Increments on each reload */
-ulong query_id=1L,long_query_count,long_query_time,aborted_threads,
+ulong query_id=1L,long_query_count,aborted_threads,
      aborted_connects,delayed_insert_timeout,delayed_insert_limit,
      delayed_queue_size,delayed_insert_threads,delayed_insert_writes,
      delayed_rows_in_use,delayed_insert_errors,flush_time, thread_created;
@@ -353,7 +354,6 @@ ulong max_connections,max_insert_delayed_threads,max_used_connections,
      max_connect_errors, max_user_connections = 0;
 ulong thread_id=1L,current_pid;
 ulong slow_launch_threads = 0;
-ulong myisam_max_sort_file_size, myisam_max_extra_sort_file_size;
 char mysql_real_data_home[FN_REFLEN],
     language[LIBLEN],reg_ext[FN_EXTLEN],
@@ -407,7 +407,7 @@ pthread_mutex_t LOCK_mysql_create_db, LOCK_Acl, LOCK_open, LOCK_thread_count,
 		LOCK_error_log,
 		LOCK_delayed_insert, LOCK_delayed_status, LOCK_delayed_create,
 		LOCK_crypt, LOCK_bytes_sent, LOCK_bytes_received,
-	        LOCK_server_id,
+	        LOCK_server_id, LOCK_global_system_variables,
 		LOCK_user_conn, LOCK_slave_list, LOCK_active_mi;
 pthread_cond_t COND_refresh,COND_thread_count,COND_binlog_update,
@@ -762,7 +762,7 @@ static pthread_handler_decl(kill_server_thread,arg __attribute__((unused)))
 static sig_handler print_signal_warning(int sig)
 {
-  if (opt_warnings)
+  if (current_thd->variables.opt_warnings)
    sql_print_error("Warning: Got signal %d from thread %d",
 		    sig,my_thread_id());
 #ifdef DONT_REMEMBER_SIGNAL
@@ -1331,14 +1331,15 @@ the problem, but since we have already crashed, something is definitely wrong\n\
 and this may fail.\n\n");
  fprintf(stderr, "key_buffer_size=%ld\n", keybuff_size);
  fprintf(stderr, "record_buffer=%ld\n", my_default_record_cache_size);
-  fprintf(stderr, "sort_buffer=%ld\n", sortbuff_size);
+  fprintf(stderr, "sort_buffer=%ld\n", thd->variables.sortbuff_size);
  fprintf(stderr, "max_used_connections=%ld\n", max_used_connections);
  fprintf(stderr, "max_connections=%ld\n", max_connections);
  fprintf(stderr, "threads_connected=%d\n", thread_count);
  fprintf(stderr, "It is possible that mysqld could use up to \n\
 key_buffer_size + (record_buffer + sort_buffer)*max_connections = %ld K\n\
 bytes of memory\n", (keybuff_size + (my_default_record_cache_size +
-			     sortbuff_size) * max_connections)/ 1024);
+				     thd->variables.sortbuff_size) *
+		     max_connections)/ 1024);
  fprintf(stderr, "Hope that's ok; if not, decrease some variables in the equation.\n\n");
 #if defined(HAVE_LINUXTHREADS)
@@ -1827,6 +1828,7 @@ int main(int argc, char **argv)
  (void) pthread_mutex_init(&LOCK_user_conn, MY_MUTEX_INIT_FAST);
  (void) pthread_mutex_init(&LOCK_rpl_status, MY_MUTEX_INIT_FAST);
  (void) pthread_mutex_init(&LOCK_active_mi, MY_MUTEX_INIT_FAST);
+  (void) pthread_mutex_init(&LOCK_global_system_variables, MY_MUTEX_INIT_FAST);
  (void) pthread_cond_init(&COND_thread_count,NULL);
  (void) pthread_cond_init(&COND_refresh,NULL);
  (void) pthread_cond_init(&COND_thread_cache,NULL);
@@ -2974,7 +2976,8 @@ static struct my_option my_long_options[] =
   0, 0, 0, 0, 0, 0},
  {"local-infile", OPT_LOCAL_INFILE,
   "Enable/disable LOAD DATA LOCAL INFILE (takes values 1|0)",
-   (gptr*) &opt_local_infile, (gptr*) &opt_local_infile, 0, GET_BOOL, OPT_ARG,
+   (gptr*) &global_system_variables.opt_local_infile,
+   (gptr*) &max_system_variables.opt_local_infile, 0, GET_BOOL, OPT_ARG,
   1, 0, 0, 0, 0, 0},
  {"log-bin", OPT_BIN_LOG,
   "Log queries in new binary format (for replication)",
@@ -3250,7 +3253,8 @@ static struct my_option my_long_options[] =
  {"version", 'v', "Synonym for option -v", 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0,
   0, 0, 0, 0},
  {"warnings", 'W', "Log some not critical warnings to the log file",
-   (gptr*) &opt_warnings, (gptr*) &opt_warnings, 0, GET_BOOL, NO_ARG, 0, 0, 0,
+   (gptr*) &global_system_variables.opt_warnings,
+   (gptr*) &max_system_variables.opt_warnings, 0, GET_BOOL, NO_ARG, 0, 0, 0,
   0, 0, 0},
  { "back_log", OPT_BACK_LOG,
    "The number of outstanding connection requests MySQL can have. This comes into play when the main MySQL thread gets very many connection requests in a very short time.", (gptr*) &back_log, (gptr*) &back_log, 0, GET_ULONG,
@@ -3355,11 +3359,13 @@ static struct my_option my_long_options[] =
 #endif /* HAVE_INNOBASE_DB */
  {"interactive_timeout", OPT_INTERACTIVE_TIMEOUT,
   "The number of seconds the server waits for activity on an interactive connection before closing it.",
-   (gptr*) &net_interactive_timeout, (gptr*) &net_interactive_timeout, 0,
+   (gptr*) &global_system_variables.net_interactive_timeout,
+   (gptr*) &max_system_variables.net_interactive_timeout, 0,
   GET_ULONG, REQUIRED_ARG, NET_WAIT_TIMEOUT, 1, LONG_TIMEOUT, 0, 1, 0},
  {"join_buffer_size", OPT_JOIN_BUFF_SIZE,
   "The size of the buffer that is used for full joins.",
-   (gptr*) &join_buff_size, (gptr*) &join_buff_size, 0, GET_ULONG,
+   (gptr*) &global_system_variables.join_buff_size,
+   (gptr*) &max_system_variables.join_buff_size, 0, GET_ULONG,
   REQUIRED_ARG, 128*1024L, IO_SIZE*2+MALLOC_OVERHEAD, ~0L, MALLOC_OVERHEAD,
   IO_SIZE, 0},
  {"key_buffer_size", OPT_KEY_BUFFER_SIZE,
@@ -3368,15 +3374,18 @@ static struct my_option my_long_options[] =
   KEY_CACHE_SIZE, MALLOC_OVERHEAD, (long) ~0, MALLOC_OVERHEAD, IO_SIZE, 0},
  {"long_query_time", OPT_LONG_QUERY_TIME,
   "Log all queries that have taken more than long_query_time seconds to execute to file.",
-   (gptr*) &long_query_time, (gptr*) &long_query_time, 0, GET_ULONG,
+   (gptr*) &global_system_variables.long_query_time,
+   (gptr*) &max_system_variables.long_query_time, 0, GET_ULONG,
   REQUIRED_ARG, 10, 1, LONG_TIMEOUT, 0, 1, 0},
  {"lower_case_table_names", OPT_LOWER_CASE_TABLE_NAMES,
   "If set to 1 table names are stored in lowercase on disk and table names will be case-insensitive.",
-   (gptr*) &lower_case_table_names, (gptr*) &lower_case_table_names, 0,
+   (gptr*) &lower_case_table_names,
+   (gptr*) &lower_case_table_names, 0,
   GET_ULONG, REQUIRED_ARG, IF_WIN(1,0), 0, 1, 0, 1, 0},
  {"max_allowed_packet", OPT_MAX_ALLOWED_PACKET,
   "Max packetlength to send/receive from to server.",
-   (gptr*) &max_allowed_packet, (gptr*) &max_allowed_packet, 0, GET_ULONG,
+   (gptr*) &max_allowed_packet,
+   (gptr*) &max_allowed_packet, 0, GET_ULONG,
   REQUIRED_ARG, 1024*1024L, 80, 64*1024*1024L, MALLOC_OVERHEAD, 1024, 0},
  {"max_binlog_cache_size", OPT_MAX_BINLOG_CACHE_SIZE,
   "Can be used to restrict the total size used to cache a multi-transaction query.",
@@ -3400,19 +3409,23 @@ static struct my_option my_long_options[] =
   0, GET_ULONG, REQUIRED_ARG, 20, 1, 16384, 0, 1, 0},
  {"max_heap_table_size", OPT_MAX_HEP_TABLE_SIZE,
   "Don't allow creation of heap tables bigger than this.",
-   (gptr*) &max_heap_table_size, (gptr*) &max_heap_table_size, 0, GET_ULONG,
+   (gptr*) &global_system_variables.max_heap_table_size,
+   (gptr*) &max_system_variables.max_heap_table_size, 0, GET_ULONG,
   REQUIRED_ARG, 16*1024*1024L, 16384, ~0L, MALLOC_OVERHEAD, 1024, 0},
  {"max_join_size", OPT_MAX_JOIN_SIZE,
   "Joins that are probably going to read more than max_join_size records return an error.",
-   (gptr*) &max_join_size, (gptr*) &max_join_size, 0, GET_ULONG, REQUIRED_ARG,
+   (gptr*) &global_system_variables.max_join_size,
+   (gptr*) &max_system_variables.max_join_size, 0, GET_ULONG, REQUIRED_ARG,
   ~0L, 1, ~0L, 0, 1, 0},
  {"max_sort_length", OPT_MAX_SORT_LENGTH,
   "The number of bytes to use when sorting BLOB or TEXT values (only the first max_sort_length bytes of each value are used; the rest are ignored).",
-   (gptr*) &max_item_sort_length, (gptr*) &max_item_sort_length, 0, GET_ULONG,
+   (gptr*) &global_system_variables.max_item_sort_length,
+   (gptr*) &max_system_variables.max_item_sort_length, 0, GET_ULONG,
   REQUIRED_ARG, 1024, 4, 8192*1024L, 0, 1, 0},
  {"max_tmp_tables", OPT_MAX_TMP_TABLES,
   "Maximum number of temporary tables a client can keep open at a time.",
-   (gptr*) &max_tmp_tables, (gptr*) &max_tmp_tables, 0, GET_ULONG,
+   (gptr*) &global_system_variables.max_tmp_tables,
+   (gptr*) &max_system_variables.max_tmp_tables, 0, GET_ULONG,
   REQUIRED_ARG, 32, 1, ~0L, 0, 1, 0},
  {"max_user_connections", OPT_MAX_USER_CONNECTIONS,
   "The maximum number of active connections for a single user (0 = no limit).",
@@ -3425,8 +3438,8 @@ static struct my_option my_long_options[] =
  {"myisam_bulk_insert_tree_size", OPT_MYISAM_BULK_INSERT_TREE_SIZE,
   "Size of tree cache used in bulk insert optimisation. Note that this is a limit per thread!",
   (gptr*) &myisam_bulk_insert_tree_size,
-   (gptr*) &myisam_bulk_insert_tree_size, 0, GET_ULONG, REQUIRED_ARG,
+   (gptr*) &myisam_bulk_insert_tree_size,
-   8192*1024, 0, ~0L, 0, 1, 0},
+   0, GET_ULONG, REQUIRED_ARG, 8192*1024, 0, ~0L, 0, 1, 0},
  {"myisam_block_size", OPT_MYISAM_BLOCK_SIZE,
   "Undocumented", (gptr*) &opt_myisam_block_size,
   (gptr*) &opt_myisam_block_size, 0, GET_ULONG, REQUIRED_ARG,
@@ -3434,32 +3447,37 @@ static struct my_option my_long_options[] =
   0, MI_MIN_KEY_BLOCK_LENGTH, 0},
  {"myisam_max_extra_sort_file_size", OPT_MYISAM_MAX_EXTRA_SORT_FILE_SIZE,
   "Used to help MySQL to decide when to use the slow but safe key cache index create method. Note that this parameter is given in megabytes!",
-   (gptr*) &myisam_max_extra_sort_file_size,
+   (gptr*) &global_system_variables.myisam_max_extra_sort_file_size,
-   (gptr*) &myisam_max_extra_sort_file_size, 0, GET_ULONG, REQUIRED_ARG,
+   (gptr*) &max_system_variables.myisam_max_extra_sort_file_size,
-   (long) (MI_MAX_TEMP_LENGTH/(1024L*1024L)), 0, ~0L, 0, 1, 0},
+   0, GET_ULONG, REQUIRED_ARG, (long) (MI_MAX_TEMP_LENGTH/(1024L*1024L)),
+   0, ~0L, 0, 1, 0},
  {"myisam_max_sort_file_size", OPT_MYISAM_MAX_SORT_FILE_SIZE,
   "Don't use the fast sort index method to created index if the temporary file would get bigger than this. Note that this paramter is given in megabytes!",
-   (gptr*) &myisam_max_sort_file_size, (gptr*) &myisam_max_sort_file_size, 0,
+   (gptr*) &global_system_variables.myisam_max_sort_file_size,
+   (gptr*) &max_system_variables.myisam_max_sort_file_size, 0,
   GET_ULONG, REQUIRED_ARG, (long) (LONG_MAX/(1024L*1024L)), 0, ~0L, 0, 1, 0},
  {"myisam_sort_buffer_size", OPT_MYISAM_SORT_BUFFER_SIZE,
   "The buffer that is allocated when sorting the index when doing a REPAIR or when creating indexes with CREATE INDEX or ALTER TABLE.",
   (gptr*) &myisam_sort_buffer_size, (gptr*) &myisam_sort_buffer_size, 0,
   GET_ULONG, REQUIRED_ARG, 8192*1024, 4, ~0L, 0, 1, 0},
  {"net_buffer_length", OPT_NET_BUFFER_LENGTH,
-   "Buffer for TCP/IP and socket communication.", (gptr*) &net_buffer_length,
+   "Buffer for TCP/IP and socket communication.", 
-   (gptr*) &net_buffer_length, 0, GET_ULONG, REQUIRED_ARG, 16384, 1024,
+   (gptr*) &net_buffer_length,
-   1024*1024L, MALLOC_OVERHEAD, 1024, 0},
+   (gptr*) &net_buffer_length, 0, GET_ULONG,
+   REQUIRED_ARG, 16384, 1024, 1024*1024L, MALLOC_OVERHEAD, 1024, 0},
  {"net_retry_count", OPT_NET_RETRY_COUNT,
   "If a read on a communication port is interrupted, retry this many times before giving up.",
   (gptr*) &mysqld_net_retry_count, (gptr*) &mysqld_net_retry_count, 0,
   GET_ULONG, REQUIRED_ARG, MYSQLD_NET_RETRY_COUNT, 1, ~0L, 0, 1, 0},
  {"net_read_timeout", OPT_NET_READ_TIMEOUT,
   "Number of seconds to wait for more data from a connection before aborting the read.",
-   (gptr*) &net_read_timeout, (gptr*) &net_read_timeout, 0, GET_ULONG,
+   (gptr*) &net_read_timeout,
+   (gptr*) &net_read_timeout, 0, GET_ULONG,
   REQUIRED_ARG, NET_READ_TIMEOUT, 1, LONG_TIMEOUT, 0, 1, 0},
  {"net_write_timeout", OPT_NET_WRITE_TIMEOUT,
   "Number of seconds to wait for a block to be written to a connection  before aborting the write.",
-   (gptr*) &net_write_timeout, (gptr*) &net_write_timeout, 0, GET_ULONG,
+   (gptr*) &net_write_timeout,
+   (gptr*) &net_write_timeout, 0, GET_ULONG,
   REQUIRED_ARG, NET_WRITE_TIMEOUT, 1, LONG_TIMEOUT, 0, 1, 0},
  {"open_files_limit", OPT_OPEN_FILES_LIMIT,
   "If this is not 0, then mysqld will use this value to reserve file descriptors to use with setrlimit(). If this value is 0 then mysqld will reserve max_connections*5 or max_connections + table_cache*2 (whichever is larger) number of files.",
@@ -3492,7 +3510,8 @@ static struct my_option my_long_options[] =
   128*1024L, IO_SIZE*2+MALLOC_OVERHEAD, ~0L, MALLOC_OVERHEAD, IO_SIZE, 0},
  {"record_rnd_buffer", OPT_RECORD_RND_BUFFER,
   "When reading rows in sorted order after a sort, the rows are read through this buffer to avoid a disk seeks. If not set, then it's set to the value of record_buffer.",
-   (gptr*) &record_rnd_cache_size, (gptr*) &record_rnd_cache_size, 0,
+   (gptr*) &global_system_variables.record_rnd_cache_size,
+   (gptr*) &max_system_variables.record_rnd_cache_size, 0,
   GET_ULONG, REQUIRED_ARG, 0, IO_SIZE*2+MALLOC_OVERHEAD,
   ~0L, MALLOC_OVERHEAD, IO_SIZE, 0},
  {"relay_log_space_limit", OPT_RELAY_LOG_SPACE_LIMIT,
@@ -3509,7 +3528,8 @@ static struct my_option my_long_options[] =
   REQUIRED_ARG, 2L, 0L, LONG_TIMEOUT, 0, 1, 0},
  {"sort_buffer", OPT_SORT_BUFFER,
   "Each thread that needs to do a sort allocates a buffer of this size.",
-   (gptr*) &sortbuff_size, (gptr*) &sortbuff_size, 0, GET_ULONG, REQUIRED_ARG,
+   (gptr*) &global_system_variables.sortbuff_size,
+   (gptr*) &max_system_variables.sortbuff_size, 0, GET_ULONG, REQUIRED_ARG,
   MAX_SORT_MEMORY, MIN_SORT_MEMORY+MALLOC_OVERHEAD*2, ~0L, MALLOC_OVERHEAD,
   1, 0},
  {"table_cache", OPT_TABLE_CACHE,
@@ -3526,7 +3546,8 @@ static struct my_option my_long_options[] =
   REQUIRED_ARG, 0, 0, 16384, 0, 1, 0},
  {"tmp_table_size", OPT_TMP_TABLE_SIZE,
   "If an in-memory temporary table exceeds this size, MySQL will automatically convert it to an on-disk MyISAM table.",
-   (gptr*) &tmp_table_size, (gptr*) &tmp_table_size, 0, GET_ULONG,
+   (gptr*) &global_system_variables.tmp_table_size,
+   (gptr*) &max_system_variables.tmp_table_size, 0, GET_ULONG,
   REQUIRED_ARG, 32*1024*1024L, 1024, ~0L, 0, 1, 0},
  {"thread_stack", OPT_THREAD_STACK,
   "The stack size for each thread.", (gptr*) &thread_stack,
@@ -3534,7 +3555,8 @@ static struct my_option my_long_options[] =
   1024*32, ~0L, 0, 1024, 0},
  {"wait_timeout", OPT_WAIT_TIMEOUT,
   "The number of seconds the server waits for activity on a connection before closing it",
-   (gptr*) &net_wait_timeout, (gptr*) &net_wait_timeout, 0, GET_ULONG,
+   (gptr*) &global_system_variables.net_wait_timeout,
+   (gptr*) &max_system_variables.net_wait_timeout, 0, GET_ULONG,
   REQUIRED_ARG, NET_WAIT_TIMEOUT, 1, LONG_TIMEOUT, 0, 1, 0},
  {0, 0, 0, 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}
 };
@@ -3596,11 +3618,18 @@ struct show_var_st init_vars[]= {
  {"innodb_log_group_home_dir", (char*) &innobase_log_group_home_dir, SHOW_CHAR_PTR},
  {"innodb_mirrored_log_groups", (char*) &innobase_mirrored_log_groups, SHOW_LONG},
 #endif
-  {"interactive_timeout",     (char*) &net_interactive_timeout,     SHOW_LONG},
+  {"interactive_timeout",
-  {"join_buffer_size",        (char*) &join_buff_size,              SHOW_LONG},
+   (char*) offsetof(struct system_variables, net_interactive_timeout),
+   SHOW_LONG_OFFSET},
+  {"join_buffer_size",
+   (char*) offsetof(struct system_variables, join_buff_size),
+   SHOW_LONG_OFFSET},
  {"key_buffer_size",         (char*) &keybuff_size,                SHOW_LONG},
  {"language",                language,                             SHOW_CHAR},
  {"large_files_support",     (char*) &opt_large_files,             SHOW_BOOL},	
+  {"local_infile",
+   (char*) offsetof(struct system_variables, opt_local_infile),
+   SHOW_MY_BOOL_OFFSET},
 #ifdef HAVE_MLOCKALL
  {"locked_in_memory",	      (char*) &locked_in_memory,	    SHOW_BOOL},
 #endif
@@ -3609,7 +3638,9 @@ struct show_var_st init_vars[]= {
  {"log_bin",                 (char*) &opt_bin_log,                 SHOW_BOOL},
  {"log_slave_updates",       (char*) &opt_log_slave_updates,       SHOW_BOOL},
  {"log_slow_queries",        (char*) &opt_slow_log,                SHOW_BOOL},
-  {"long_query_time",         (char*) &long_query_time,             SHOW_LONG},
+  {"long_query_time",         
+   (char*) offsetof(struct system_variables, long_query_time),
+   SHOW_LONG_OFFSET},
  {"low_priority_updates",    (char*) &low_priority_updates,        SHOW_BOOL},
  {"lower_case_table_names",  (char*) &lower_case_table_names,      SHOW_LONG},
  {"max_allowed_packet",      (char*) &max_allowed_packet,          SHOW_LONG},
@@ -3618,31 +3649,45 @@ struct show_var_st init_vars[]= {
  {"max_connections",         (char*) &max_connections,             SHOW_LONG},
  {"max_connect_errors",      (char*) &max_connect_errors,          SHOW_LONG},
  {"max_delayed_threads",     (char*) &max_insert_delayed_threads,  SHOW_LONG},
-  {"max_heap_table_size",     (char*) &max_heap_table_size,         SHOW_LONG},
+  {"max_heap_table_size",
-  {"max_join_size",           (char*) &max_join_size,               SHOW_LONG},
+   (char*) offsetof(struct system_variables, max_heap_table_size),
-  {"max_sort_length",         (char*) &max_item_sort_length,        SHOW_LONG},
+   SHOW_LONG_OFFSET},
+  {"max_join_size",
+   (char*) offsetof(struct system_variables, max_join_size),
+   SHOW_LONG_OFFSET},
+  {"max_sort_length",
+   (char*) offsetof(struct system_variables, max_item_sort_length),
+   SHOW_LONG_OFFSET},
  {"max_user_connections",    (char*) &max_user_connections,        SHOW_LONG},
-  {"max_tmp_tables",          (char*) &max_tmp_tables,              SHOW_LONG},
+  {"max_tmp_tables",
+   (char*) offsetof(struct system_variables, max_tmp_tables),
+   SHOW_LONG_OFFSET},
  {"max_write_lock_count",    (char*) &max_write_lock_count,        SHOW_LONG},
-  {"myisam_bulk_insert_tree_size", (char*) &myisam_bulk_insert_tree_size, SHOW_INT},
+    {"myisam_bulk_insert_tree_size", (char*) &myisam_bulk_insert_tree_size, SHOW_INT},
-  {"myisam_max_extra_sort_file_size", (char*) &myisam_max_extra_sort_file_size,
+  {"myisam_max_extra_sort_file_size",
-   SHOW_LONG},
+   (char*) offsetof(struct system_variables,
-  {"myisam_max_sort_file_size",(char*) &myisam_max_sort_file_size,  SHOW_LONG},
+		    myisam_max_extra_sort_file_size),
+   SHOW_LONG_OFFSET},
+  {"myisam_max_sort_file_size",
+   (char*) offsetof(struct system_variables, myisam_max_sort_file_size),
+   SHOW_LONG_OFFSET},
  {"myisam_recover_options",  (char*) &myisam_recover_options_str,  SHOW_CHAR_PTR},
  {"myisam_sort_buffer_size", (char*) &myisam_sort_buffer_size,     SHOW_LONG},
 #ifdef __NT__
  {"named_pipe",	      (char*) &opt_enable_named_pipe,       SHOW_BOOL},
 #endif
  {"net_buffer_length",       (char*) &net_buffer_length,           SHOW_LONG},
-  {"net_read_timeout",        (char*) &net_read_timeout,	    SHOW_LONG},
+  {"net_read_timeout",        (char*) &net_read_timeout,            SHOW_LONG},
  {"net_retry_count",         (char*) &mysqld_net_retry_count,      SHOW_LONG},
-  {"net_write_timeout",       (char*) &net_write_timeout,	    SHOW_LONG},
+  {"net_write_timeout",       (char*) &net_write_timeout,           SHOW_LONG},
  {"open_files_limit",	      (char*) &open_files_limit,	    SHOW_LONG},
  {"pid_file",                (char*) pidfile_name,                 SHOW_CHAR},
  {"port",                    (char*) &mysql_port,                  SHOW_INT},
  {"protocol_version",        (char*) &protocol_version,            SHOW_INT},
  {"record_buffer",           (char*) &my_default_record_cache_size,SHOW_LONG},
-  {"record_rnd_buffer",       (char*) &record_rnd_cache_size,	    SHOW_LONG},
+  {"record_rnd_buffer",
+   (char*) offsetof(struct system_variables, record_rnd_cache_size),
+   SHOW_LONG_OFFSET},
  {"rpl_recovery_rank",       (char*) &rpl_recovery_rank,           SHOW_LONG},
  {"query_buffer_size",       (char*) &query_buff_size,		    SHOW_LONG},
 #ifdef HAVE_QUERY_CACHE
@@ -3658,7 +3703,9 @@ struct show_var_st init_vars[]= {
  {"skip_show_database",      (char*) &opt_skip_show_db,            SHOW_BOOL},
  {"slow_launch_time",        (char*) &slow_launch_time,            SHOW_LONG},
  {"socket",                  (char*) &mysql_unix_port,             SHOW_CHAR_PTR},
-  {"sort_buffer",             (char*) &sortbuff_size,               SHOW_LONG},
+  {"sort_buffer",
+   (char*) offsetof(struct system_variables, sortbuff_size),
+   SHOW_LONG_OFFSET},
  {"sql_mode",                (char*) &opt_sql_mode,                SHOW_LONG},
  {"table_cache",             (char*) &table_cache_size,            SHOW_LONG},
  {"table_type",              (char*) &default_table_type_name,     SHOW_CHAR_PTR},
@@ -3671,10 +3718,17 @@ struct show_var_st init_vars[]= {
 #ifdef HAVE_TZNAME
  {"timezone",                time_zone,                            SHOW_CHAR},
 #endif
-  {"tmp_table_size",          (char*) &tmp_table_size,              SHOW_LONG},
+  {"tmp_table_size",
+   (char*) offsetof(struct system_variables, tmp_table_size),
+   SHOW_LONG_OFFSET},
  {"tmpdir",                  (char*) &mysql_tmpdir,                SHOW_CHAR_PTR},
  {"version",                 server_version,                       SHOW_CHAR},
-  {"wait_timeout",            (char*) &net_wait_timeout,            SHOW_LONG},
+  {"wait_timeout",
+   (char*) offsetof(struct system_variables, net_wait_timeout),
+   SHOW_LONG_OFFSET},
+  {"warnings",
+   (char*) offsetof(struct system_variables, opt_warnings),
+   SHOW_MY_BOOL_OFFSET},
  {NullS, NullS, SHOW_LONG}
 };
@@ -4414,6 +4468,7 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
 static void get_options(int argc,char **argv)
 {
  int ho_error;
+  THD *thd= current_thd;
  myisam_delay_key_write=1;			// Allow use of this
 #ifndef HAVE_purify
@@ -4434,12 +4489,18 @@ static void get_options(int argc,char **argv)
  default_table_type_name=ha_table_typelib.type_names[default_table_type-1];
  default_tx_isolation_name=tx_isolation_typelib.type_names[default_tx_isolation];
  /* To be deleted in MySQL 4.0 */
-  if (!record_rnd_cache_size)
+  if (!thd->variables.record_rnd_cache_size)
-    record_rnd_cache_size=my_default_record_cache_size;
+    thd->variables.record_rnd_cache_size= my_default_record_cache_size;
  /* Fix variables that are base 1024*1024 */
-  myisam_max_temp_length= (my_off_t) min(((ulonglong) myisam_max_sort_file_size)*1024*1024, (ulonglong) MAX_FILE_SIZE);
+  myisam_max_temp_length=
-  myisam_max_extra_temp_length= (my_off_t) min(((ulonglong) myisam_max_extra_sort_file_size)*1024*1024, (ulonglong) MAX_FILE_SIZE);
+    (my_off_t) min(((ulonglong)
+		    thd->variables.myisam_max_sort_file_size)*1024 * 1024,
+		   (ulonglong) MAX_FILE_SIZE);
+  myisam_max_extra_temp_length= 
+    (my_off_t) min(((ulonglong)
+		    thd->variables.myisam_max_extra_sort_file_size)*1024*1024,
+		   (ulonglong) MAX_FILE_SIZE);
  myisam_block_size=(uint) 1 << my_bit_log2(opt_myisam_block_size);
 }

--- a/sql/net_serv.cc
+++ b/sql/net_serv.cc
@@ -86,7 +86,7 @@ extern pthread_mutex_t LOCK_bytes_sent , LOCK_bytes_received;
 #define TEST_BLOCKING		8
 #define MAX_THREE_BYTES 255L*255L*255L
-ulong net_buffer_length=8192;	/* Default length. Enlarged if necessary */
+ulong net_buffer_length=8192;   /* Default length. Enlarged if necessary */
 static int net_write_buff(NET *net,const char *packet,ulong len);
@@ -105,7 +105,7 @@ int my_net_init(NET *net, Vio* vio)
  net->vio = vio;
  net->no_send_ok = 0;
  net->error=0; net->return_errno=0; net->return_status=0;
-  net->timeout=(uint) net_read_timeout;		/* Timeout for read */
+  net->timeout=(uint) net_read_timeout; /* Timeout for read */
  net->pkt_nr=net->compress_pkt_nr=0;
  net->write_pos=net->read_pos = net->buff;
  net->last_error[0]=0;

--- a/sql/records.cc
+++ b/sql/records.cc
@@ -61,7 +61,7 @@ void init_read_record(READ_RECORD *info,THD *thd, TABLE *table,
    table->file->rnd_init(0);
    if (! (specialflag & SPECIAL_SAFE_MODE) &&
-	record_rnd_cache_size &&
+	thd->variables.record_rnd_cache_size &&
 	!table->file->fast_key_read() &&
 	(table->db_stat & HA_READ_ONLY ||
 	 table->reginfo.lock_type <= TL_READ_NO_INSERT) &&
@@ -229,6 +229,8 @@ static int rr_from_pointers(READ_RECORD *info)
 static int init_rr_cache(READ_RECORD *info)
 {
  uint rec_cache_size;
+  THD *thd= current_thd;
  DBUG_ENTER("init_rr_cache");
  info->struct_length=3+MAX_REFLENGTH;
@@ -237,7 +239,7 @@ static int init_rr_cache(READ_RECORD *info)
    info->reclength=ALIGN_SIZE(info->struct_length);
  info->error_offset=info->table->reclength;
-  info->cache_records=record_rnd_cache_size/
+  info->cache_records= thd->variables.record_rnd_cache_size /
    (info->reclength+info->struct_length);
  rec_cache_size=info->cache_records*info->reclength;
  info->rec_cache_size=info->cache_records*info->ref_length;

--- a/sql/sql_acl.cc
+++ b/sql/sql_acl.cc
@@ -779,6 +779,7 @@ ulong acl_get(const char *host, const char *ip, const char *bin_ip,
  db_access=0; host_access= ~0;
  char key[ACL_KEY_LENGTH],*tmp_db,*end;
  acl_entry *entry;
+  THD *thd= current_thd;
  VOID(pthread_mutex_lock(&acl_cache->lock));
  memcpy_fixed(&key,bin_ip,sizeof(struct in_addr));

--- a/sql/sql_class.cc
+++ b/sql/sql_class.cc
@@ -87,6 +87,9 @@ THD::THD():user_time(0),fatal_error(0),last_insert_id_used(0),
  host_or_ip="unknown ip";
  locked=killed=count_cuted_fields=some_tables_deleted=no_errors=password=
    query_start_used=safe_to_cache_query=0;
+  pthread_mutex_lock(&LOCK_global_system_variables);
+  variables= global_system_variables;
+  pthread_mutex_unlock(&LOCK_global_system_variables);
  db_length=query_length=col_access=0;
  query_error=0;
  next_insert_id=last_insert_id=0;
@@ -134,14 +137,15 @@ THD::THD():user_time(0),fatal_error(0),last_insert_id_used(0),
  query_cache_type= 0; //Safety
 #endif
  sql_mode=(uint) opt_sql_mode;
-  inactive_timeout=net_wait_timeout;
+  inactive_timeout= variables.net_wait_timeout;
  open_options=ha_open_options;
  tx_isolation=session_tx_isolation=default_tx_isolation;
  command=COM_CONNECT;
  set_query_id=1;
  default_select_limit= HA_POS_ERROR;
-  max_join_size=  ((::max_join_size != ~ (ulong) 0L) ? ::max_join_size :
+  max_join_size= ((variables.max_join_size != ~ (ulong) 0L) ?
-		   HA_POS_ERROR);
+		  variables.max_join_size :
+		  HA_POS_ERROR);
  db_access=NO_ACCESS;
  /* Initialize sub structures */

--- a/sql/sql_class.h
+++ b/sql/sql_class.h
@@ -280,6 +280,26 @@ class delayed_insert;
 #define THD_CHECK_SENTRY(thd) DBUG_ASSERT(thd->dbug_sentry == THD_SENTRY_MAGIC)
+struct system_variables
+{
+  my_bool opt_local_infile;
+  my_bool opt_warnings;
+  ulong join_buff_size;
+  ulong long_query_time;
+  ulong max_heap_table_size;
+  ulong max_item_sort_length;
+  ulong max_join_size;
+  ulong max_tmp_tables;
+  ulong myisam_max_extra_sort_file_size;
+  ulong myisam_max_sort_file_size;
+  ulong net_interactive_timeout;
+  ulong net_wait_timeout;
+  ulong record_rnd_cache_size;
+  ulong sortbuff_size;
+  ulong tmp_table_size;
+}; /* system variables */
 /* For each client connection we create a separate thread with THD serving as
   a thread/connection descriptor */
@@ -292,6 +312,7 @@ class THD :public ilink {
  String  packet; // dynamic string buffer used for network I/O		
  struct  sockaddr_in remote; // client socket address
  struct  rand_struct rand; // used for authentication
+  struct  system_variables variables;
  /* query points to the current query,
     thread_stack is a pointer to the stack frame of handle_one_connection(),

--- a/sql/sql_delete.cc
+++ b/sql/sql_delete.cc
@@ -201,7 +201,7 @@ int mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds, ORDER *order,
  Delete multiple tables from join 
 ***************************************************************************/
-#define MEM_STRIP_BUF_SIZE sortbuff_size
+#define MEM_STRIP_BUF_SIZE current_thd->variables.sortbuff_size
 int refposcmp2(void* arg, const void *a,const void *b)
 {

--- a/sql/sql_lex.cc
+++ b/sql/sql_lex.cc
@@ -151,6 +151,7 @@ LEX *lex_start(THD *thd, uchar *buf,uint length)
  lex->yacc_yyss=lex->yacc_yyvs=0;
  lex->ignore_space=test(thd->sql_mode & MODE_IGNORE_SPACE);
  lex->slave_thd_opt=0;
+  lex->sql_command=SQLCOM_END;
  bzero(&lex->mi,sizeof(lex->mi));
  return lex;
 }

--- a/sql/sql_lex.h
+++ b/sql/sql_lex.h
@@ -162,6 +162,7 @@ typedef struct st_lex
  LEX_USER *grant_user;
  gptr yacc_yyss,yacc_yyvs;
  THD *thd;
+  struct system_variables *variable_values;
  udf_func udf;
  HA_CHECK_OPT   check_opt;			// check/repair options
  HA_CREATE_INFO create_info;

--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -559,7 +559,7 @@ check_connections(THD *thd)
  if (thd->client_capabilities & CLIENT_CONNECT_WITH_DB)
    db=strend(passwd)+1;
  if (thd->client_capabilities & CLIENT_INTERACTIVE)
-    thd->inactive_timeout=net_interactive_timeout;
+    thd->inactive_timeout= thd->variables.net_interactive_timeout;
  if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
      opt_using_transactions)
    thd->net.return_status= &thd->server_status;
@@ -661,7 +661,7 @@ pthread_handler_decl(handle_one_connection,arg)
    free_root(&thd->mem_root,MYF(0));
    if (net->error && net->vio != 0)
    {
-      if (!thd->killed && opt_warnings)
+      if (!thd->killed && thd->variables.opt_warnings)
 	sql_print_error(ER(ER_NEW_ABORTING_CONNECTION),
 			thd->thread_id,(thd->db ? thd->db : "unconnected"),
 			thd->user ? thd->user : "unauthenticated",
@@ -1196,7 +1196,8 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
  {
    thd->proc_info="logging slow query";
-    if ((ulong) (thd->start_time - thd->time_after_lock) > long_query_time ||
+    if ((ulong) (thd->start_time - thd->time_after_lock) >
+	thd->variables.long_query_time ||
 	((thd->lex.select_lex.options &
 	  (QUERY_NO_INDEX_USED | QUERY_NO_GOOD_INDEX_USED)) &&
 	 (specialflag & SPECIAL_LONG_LOG_FORMAT)))
@@ -2040,11 +2041,12 @@ mysql_execute_command(void)
 			  thd->priv_user,lex->verbose);
    break;
  case SQLCOM_SHOW_STATUS:
-    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars);
+    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
+		     (struct system_variables*) 0);
    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
-		     init_vars);
+		     init_vars, lex->variable_values);
    break;
  case SQLCOM_SHOW_LOGS:
  {
@@ -2151,7 +2153,7 @@ mysql_execute_command(void)
    else
    {
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
-	  ! opt_local_infile)
+	  ! thd->variables.opt_local_infile)
      {
 	send_error(&thd->net,ER_NOT_ALLOWED_COMMAND);
 	goto error;

--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -1711,6 +1711,7 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
 {
  ulong rec;
  double tmp;
+  THD *thd= current_thd;
  if (!rest_tables)
  {
@@ -1977,7 +1978,8 @@ find_best(JOIN *join,table_map rest_tables,uint idx,double record_count,
 	  tmp=(double) s->read_time;
 	  /* Calculate time to read through cache */
 	  tmp*=(1.0+floor((double) cache_record_length(join,idx)*
-			  record_count/(double) join_buff_size));
+			  record_count /
+			  (double) thd->variables.join_buff_size));
 	}
 	if (best == DBL_MAX ||
 	    (tmp  + record_count/(double) TIME_FOR_COMPARE*s->found_records <
@@ -3769,12 +3771,13 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
  param->recinfo=recinfo;
  store_record(table,2);			// Make empty default record
-  if (tmp_table_size == ~(ulong) 0)		// No limit
+  if (thd->variables.tmp_table_size == ~(ulong) 0)		// No limit
    table->max_rows= ~(ha_rows) 0;
  else
    table->max_rows=(((table->db_type == DB_TYPE_HEAP) ?
-		      min(tmp_table_size, max_heap_table_size) :
+		      min(thd->variables.tmp_table_size,
-		      tmp_table_size)/ table->reclength);
+			  thd->variables.max_heap_table_size) :
+		      thd->variables.tmp_table_size)/ table->reclength);
  set_if_bigger(table->max_rows,1);		// For dummy start options
  keyinfo=param->keyinfo;
@@ -5755,6 +5758,8 @@ remove_duplicates(JOIN *join, TABLE *entry,List<Item> &fields, Item *having)
  int error;
  ulong reclength,offset;
  uint field_count;
+  THD *thd= current_thd;
  DBUG_ENTER("remove_duplicates");
  entry->reginfo.lock_type=TL_WRITE;
@@ -5783,7 +5788,7 @@ remove_duplicates(JOIN *join, TABLE *entry,List<Item> &fields, Item *having)
  if (entry->db_type == DB_TYPE_HEAP ||
      (!entry->blob_fields &&
       ((ALIGN_SIZE(reclength) +sizeof(HASH_LINK)) * entry->file->records <
-	sortbuff_size)))
+	thd->variables.sortbuff_size)))
    error=remove_dup_with_hash_index(join->thd, entry,
 				     field_count, first_field,
 				     reclength, having);
@@ -6104,7 +6109,7 @@ join_init_cache(THD *thd,JOIN_TAB *tables,uint table_count)
  cache->length=length+blobs*sizeof(char*);
  cache->blobs=blobs;
  *blob_ptr=0;					/* End sequentel */
-  size=max(join_buff_size,cache->length);
+  size=max(thd->variables.join_buff_size, cache->length);
  if (!(cache->buff=(uchar*) my_malloc(size,MYF(0))))
    DBUG_RETURN(1);				/* Don't use cache */ /* purecov: inspected */
  cache->end=cache->buff+size;

--- a/sql/sql_show.cc
+++ b/sql/sql_show.cc
@@ -1142,13 +1142,16 @@ void mysqld_list_processes(THD *thd,const char *user, bool verbose)
 *****************************************************************************/
-int mysqld_show(THD *thd, const char *wild, show_var_st *variables)
+int mysqld_show(THD *thd, const char *wild, show_var_st *variables,
+		struct system_variables *values)
 {
  uint i;
  char buff[8192];
  String packet2(buff,sizeof(buff));
  List<Item> field_list;
  CONVERT *convert=thd->convert_set;
+  ulong offset;
  DBUG_ENTER("mysqld_show");
  field_list.push_back(new Item_empty_string("Variable_name",30));
  field_list.push_back(new Item_empty_string("Value",256));
@@ -1168,6 +1171,11 @@ int mysqld_show(THD *thd, const char *wild, show_var_st *variables)
      case SHOW_LONG_CONST:
        net_store_data(&packet2,(uint32) *(ulong*) variables[i].value);
        break;
+      case SHOW_LONG_OFFSET:
+	offset= (ulong) variables[i].value;
+        net_store_data(&packet2,
+		       (uint32) *(ulong*) (((char*) values) + offset));
+	break;
      case SHOW_BOOL:
        net_store_data(&packet2,(ulong) *(bool*) variables[i].value ?
                       "ON" : "OFF");
@@ -1176,10 +1184,21 @@ int mysqld_show(THD *thd, const char *wild, show_var_st *variables)
        net_store_data(&packet2,(ulong) *(my_bool*) variables[i].value ?
                       "ON" : "OFF");
        break;
+      case SHOW_MY_BOOL_OFFSET:
+	offset= (ulong) variables[i].value;
+        net_store_data(&packet2,
+		       ((ulong) *(my_bool*) (((char*) values) + offset)) ?
+                       "ON" : "OFF");
+        break;
      case SHOW_INT_CONST:
      case SHOW_INT:
        net_store_data(&packet2,(uint32) *(int*) variables[i].value);
        break;
+      case SHOW_INT_OFFSET:
+	offset= (ulong) variables[i].value;
+        net_store_data(&packet2,
+		       (uint32) *(int*) (((char*) values) + offset));
+        break;
      case SHOW_HAVE:
      {
 	SHOW_COMP_OPTION tmp= *(SHOW_COMP_OPTION*) variables[i].value;

--- a/sql/sql_yacc.yy
+++ b/sql/sql_yacc.yy
@@ -522,7 +522,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 %type <num>
 	type int_type real_type order_dir opt_field_spec set_option lock_option
 	udf_type if_exists opt_local opt_table_options table_options
-	table_option opt_if_not_exists 
+	table_option opt_if_not_exists opt_var_type
 %type <ulong_num>
 	ULONG_NUM raid_types merge_insert_types
@@ -2630,8 +2630,15 @@ show_param:
 	  { Lex->sql_command= SQLCOM_SHOW_STATUS; }
 	| opt_full PROCESSLIST_SYM
 	  { Lex->sql_command= SQLCOM_SHOW_PROCESSLIST;}
-	| VARIABLES wild
+	| opt_var_type VARIABLES wild
-	  { Lex->sql_command= SQLCOM_SHOW_VARIABLES; }
+	{
+	    THD *thd= current_thd;
+	    thd->lex.sql_command= SQLCOM_SHOW_VARIABLES;
+	    if ($1)
+	      thd->lex.variable_values= &thd->variables;
+	    else
+	      thd->lex.variable_values= &global_system_variables;
+	  }
 	| LOGS_SYM
 	  { Lex->sql_command= SQLCOM_SHOW_LOGS; }
 	| GRANTS FOR_SYM user
@@ -2668,6 +2675,12 @@ opt_full:
 	/* empty */ { Lex->verbose=0; }
 	| FULL	    { Lex->verbose=1; };
+opt_var_type:
+	/* empty */	{ $$=1; /* local variable */ }
+	| LOCAL_SYM	{ $$=1; }
+	| GLOBAL_SYM	{ $$=0; }
+	;
 from_or_in:
 	FROM
 	| IN_SYM;

--- a/sql/structs.h
+++ b/sql/structs.h
@@ -126,7 +126,8 @@ typedef struct {
 enum SHOW_TYPE { SHOW_LONG,SHOW_CHAR,SHOW_INT,SHOW_CHAR_PTR,SHOW_BOOL,
 		 SHOW_MY_BOOL,SHOW_OPENTABLES,SHOW_STARTTIME,SHOW_QUESTION,
-		 SHOW_LONG_CONST, SHOW_INT_CONST, SHOW_HAVE
+		 SHOW_LONG_CONST, SHOW_INT_CONST, SHOW_HAVE,
+		 SHOW_LONG_OFFSET, SHOW_INT_OFFSET, SHOW_MY_BOOL_OFFSET
 #ifdef HAVE_OPENSSL
                 ,SHOW_SSL_CTX_SESS_ACCEPT, 	SHOW_SSL_CTX_SESS_ACCEPT_GOOD
 		 ,SHOW_SSL_GET_VERSION, 	SHOW_SSL_CTX_GET_SESSION_CACHE_MODE