added synchronization in mysql_create_like_table

(
fixed BUG #2385 CREATE TABLE LIKE lacks locking on source and destination table
and added tests for it
)

mysql-test/include/have_debug.inc

+-- require r/have_debug.require
+disable_query_log;
+select instr(version(),convert('debug' using utf8))!=0;
+enable_query_log;

mysql-test/r/have_debug.require

+instr(version(),convert('debug' using utf8))!=0;
+1
\ No newline at end of file

mysql-test/t/synchronization-master.opt

+--exit-info=2048
\ No newline at end of file

mysql-test/t/synchronization.test

+-- source include/have_crypt.inc
+
+#
+# Test for Bug #2385 CREATE TABLE LIKE lacks locking on source and destination table
+#
+
+connect (con_to_sleep,localhost,lock_controller,,);
+connect (con_to_harm_sleeper,localhost,root,,);
+
+# locking of source:
+connection con_to_sleep;
+CREATE TABLE t1 (a int);
+send CREATE TABLE t2 LIKE t1;
+
+connection con_to_harm_sleeper;
+ALTER TABLE t1 add key(a);
+
+connection con_to_sleep;
+sleep 4;
+SHOW CREATE TABLE t2;
+drop table t1, t2;
+
+# locking of destination:
+connection con_to_sleep;
+CREATE TABLE t1 (a int);
+send CREATE TABLE t2 LIKE t1;
+
+connection con_to_harm_sleeper;
+sleep 1;
+CREATE TABLE t2 (b int);
+disable_query_log;
+select "-----------" as "let's take a look at result of create .. like : ";
+enable_query_log;
+
+connection con_to_sleep;
+sleep 1;
+--error 1
+reap;
+disable_query_log;
+select "" as "-----------";
+enable_query_log;
+SHOW CREATE TABLE t2;
+
+drop table t1, t2;
\ No newline at end of file

sql/mysql_priv.h

@@ -171,6 +171,8 @@ extern CHARSET_INFO *national_charset_info, *table_alias_charset;
 #define TEST_CORE_ON_SIGNAL	256	/* Give core if signal */
 #define TEST_NO_STACKTRACE	512
 #define TEST_SIGINT		1024	/* Allow sigint on threads */
+#define TEST_SYNCHRONIZATION	2048	/* get server to do sleep in some 
+                                                                       places */
 
 /* options for select set by the yacc parser (stored in lex->options) */
 #define SELECT_DISTINCT		(1L << 0)

sql/mysqld.cc

@@ -2107,8 +2107,10 @@ static int init_common_variables(const char *conf_file_name, int argc,
   if (*(MYSQL_SERVER_SUFFIX))
     strxmov(strend(server_version),MYSQL_SERVER_SUFFIX,"-debug",NullS);
   else
-#endif
+    strmov(strend(server_version),"--debug");
+#else
     strmov(strend(server_version),MYSQL_SERVER_SUFFIX);
+#endif
 
   load_defaults(conf_file_name, groups, &argc, &argv);
   defaults_argv=argv;

sql/sql_table.cc

@@ -1882,7 +1882,8 @@ int mysql_create_like_table(THD* thd, TABLE_LIST* table,
   char *table_name= table->real_name;
   char *src_db= thd->db;
   char *src_table= table_ident->table.str;
-  int  err;
+  int  err, res= -1;
+  TABLE_LIST src_tables_list;
   DBUG_ENTER("mysql_create_like_table");
 
   /*
@@ -1897,6 +1898,13 @@ int mysql_create_like_table(THD* thd, TABLE_LIST* table,
     DBUG_RETURN(-1);
   }
   
+  src_tables_list.db= table_ident->db.str ? table_ident->db.str : thd->db;
+  src_tables_list.real_name= table_ident->table.str;
+  src_tables_list.next= 0;
+  
+  if (lock_and_wait_for_table_name(thd, &src_tables_list))
+    goto err;
+
   if ((tmp_table= find_temporary_table(thd, src_db, src_table)))
     strxmov(src_path, (*tmp_table)->path, reg_ext, NullS);
   else
@@ -1906,7 +1914,7 @@ int mysql_create_like_table(THD* thd, TABLE_LIST* table,
     if (access(src_path, F_OK))
     {
       my_error(ER_BAD_TABLE_ERROR, MYF(0), src_table);
-      DBUG_RETURN(-1);
+      goto err;
     }
   }
 
@@ -1935,8 +1943,13 @@ int mysql_create_like_table(THD* thd, TABLE_LIST* table,
   /* 
     Create a new table by copying from source table
   */  
-  if (my_copy(src_path, dst_path, MYF(MY_WME)))
-    DBUG_RETURN(-1);
+#ifndef DBUG_OFF
+  // The code stated below is for test synchronization.test Bug #2385
+  if (test_flags & TEST_SYNCHRONIZATION)
+    sleep(3);
+#endif
+  if (my_copy(src_path, dst_path, MYF(MY_WME|MY_DONT_OVERWRITE_FILE)))
+    goto err;
 
   /*
     As mysql_truncate don't work on a new table at this stage of 
@@ -1952,14 +1965,14 @@ int mysql_create_like_table(THD* thd, TABLE_LIST* table,
     {
       (void) rm_temporary_table(create_info->db_type, 
                                 dst_path); /* purecov: inspected */
-      DBUG_RETURN(-1);     /* purecov: inspected */
+      goto err;     /* purecov: inspected */
     }
   }
   else if (err)
   {
     (void) quick_rm_table(create_info->db_type, db, 
                           table_name); /* purecov: inspected */
-    DBUG_RETURN(-1);       /* purecov: inspected */
+    goto err;       /* purecov: inspected */
   }
 
   // Must be written before unlock
@@ -1972,9 +1985,18 @@ int mysql_create_like_table(THD* thd, TABLE_LIST* table,
 			       HA_LEX_CREATE_TMP_TABLE));
     mysql_bin_log.write(&qinfo);
   }
-  DBUG_RETURN(0);
+  res= 0;
+
+err:
+  pthread_mutex_lock(&LOCK_open);
+  unlock_table_name(thd, &src_tables_list);
+  pthread_mutex_unlock(&LOCK_open);
+  DBUG_RETURN(res);
   
 table_exists:
+  pthread_mutex_lock(&LOCK_open);
+  unlock_table_name(thd, &src_tables_list);
+  pthread_mutex_unlock(&LOCK_open);
   if (create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS)
   {
     char warn_buff[MYSQL_ERRMSG_SIZE];