Bug#29770237 REMOVE MYSQLTEST "REAL_SLEEP" COMMAND

The mysqltest command "real_sleep" is an old artifact from early
days of MySQL development, it no longer serves any purpose.

  SELECT * FROM t1;
  --sleep 3
  SELECT * FROM T1

The intention was that one should be able write tests using the sleep
command and if the machine is slow, pass --sleep with a higher value
in order to increase the time slept during the test. This is not
practical in an automated test environment like we have today.

Using "mysqltest --sleep 1", the above sleep would be changed to 1
second and "mysqltest --sleep=10" would change it to 10 seconds.
If there are more sleep commands in a test, they will all be changed
to same value and hence, it doesn't scale.

We have already changed all usage of sleep into loops and there are
various include files to use to wait until certain condition has been
fulfilled. This has made it possible to run our test suite on both
slow and fast machines.

The patch does the following :-
- Removes the mysqltest "real_sleep" command. All instances of the
  command in the test suite are replaced with the "sleep" command.
- Removes the "mysqltest --sleep" command line argument.
- Removes the "mysql-test-run.pl --sleep" command line argument.
- Changes the mysqltest "sleep" command to always wait as long as
  argument specified.
- Updates the code comments for "do_sleep()" to indicate that
  fractional values can be used as a sleep value, not only whole
  seconds. i.e., sleep 0.1;
- Updates the mysqltest documentation to delete all information about
  the removed command and options. It also clearly describes that the
  "sleep" command supports sleeping for intervals which are less than
  one second.

Change-Id: I060d635aa3cbcb62323d1e5ea946264a44a56461

client/mysqltest.cc

@@ -181,7 +181,7 @@ enum {
   OPT_VIEW_PROTOCOL,
 };
 
-static int record = 0, opt_sleep = -1;
+static int record = 0;
 static char *opt_db = nullptr, *opt_pass = nullptr;
 const char *opt_user = nullptr, *opt_host = nullptr, *unix_sock = nullptr,
            *opt_basedir = "./";
@@ -429,7 +429,6 @@ enum enum_commands {
   Q_QUERY,
   Q_CONNECT,
   Q_SLEEP,
-  Q_REAL_SLEEP,
   Q_INC,
   Q_DEC,
   Q_SOURCE,
@@ -529,11 +528,10 @@ enum enum_commands {
 };
 
 const char *command_names[] = {
-    "connection", "query", "connect", "sleep", "real_sleep", "inc", "dec",
-    "source", "disconnect", "let", "echo", "expr", "while", "end",
-    "save_master_pos", "sync_with_master", "sync_slave_with_master", "error",
-    "send", "reap", "dirty_close", "replace_result", "replace_column", "ping",
-    "eval",
+    "connection", "query", "connect", "sleep", "inc", "dec", "source",
+    "disconnect", "let", "echo", "expr", "while", "end", "save_master_pos",
+    "sync_with_master", "sync_slave_with_master", "error", "send", "reap",
+    "dirty_close", "replace_result", "replace_column", "ping", "eval",
     /* Enable/disable that the _query_ is logged to result file */
     "enable_query_log", "disable_query_log",
     /* Enable/disable that the _result_ from a query is logged to result file */
@@ -5209,23 +5207,17 @@ static void do_let(struct st_command *command) {
   SYNOPSIS
   do_sleep()
   q	       called command
-  real_sleep   use the value from opt_sleep as number of seconds to sleep
-               if real_sleep is false
 
   DESCRIPTION
-  sleep <seconds>
-  real_sleep <seconds>
-
-  The difference between the sleep and real_sleep commands is that sleep
-  uses the delay from the --sleep command-line option if there is one.
-  (If the --sleep option is not given, the sleep command uses the delay
-  specified by its argument.) The real_sleep command always uses the
-  delay specified by its argument.  The logic is that sometimes delays are
-  cpu-dependent, and --sleep can be used to set this delay.  real_sleep is
-  used for cpu-independent delays.
+  Sleep <seconds>
+
+  The argument provided to --sleep command is not required to be
+  a whole number and can have fractional parts as well. For
+  example, '--sleep 0.1' is valid.
+
 */
 
-static int do_sleep(struct st_command *command, bool real_sleep) {
+static int do_sleep(struct st_command *command) {
   int error = 0;
   double sleep_val;
   char *p;
@@ -5255,9 +5247,6 @@ static int do_sleep(struct st_command *command, bool real_sleep) {
         command->first_argument);
   dynstr_free(&ds_sleep);
 
-  /* Fixed sleep time selected by --sleep option */
-  if (opt_sleep >= 0 && !real_sleep) sleep_val = opt_sleep;
-
   DBUG_PRINT("info", ("sleep_val: %f", sleep_val));
   if (sleep_val) my_sleep((ulong)(sleep_val * 1000000L));
   return 0;
@@ -7433,9 +7422,6 @@ static struct my_option my_long_options[] = {
      0, nullptr},
     {"silent", 's', "Suppress all normal output. Synonym for --quiet.", &silent,
      &silent, nullptr, GET_BOOL, NO_ARG, 0, 0, 0, nullptr, 0, nullptr},
-    {"sleep", 'T', "Always sleep this many seconds on sleep commands.",
-     &opt_sleep, &opt_sleep, nullptr, GET_INT, REQUIRED_ARG, -1, -1, 0, nullptr,
-     0, nullptr},
     {"socket", 'S', "The socket file to use for connection.", &unix_sock,
      &unix_sock, nullptr, GET_STR, REQUIRED_ARG, 0, 0, 0, nullptr, 0, nullptr},
     {"sp-protocol", OPT_SP_PROTOCOL, "Use stored procedures for select.",
@@ -9380,10 +9366,7 @@ int main(int argc, char **argv) {
           do_source(command);
           break;
         case Q_SLEEP:
-          do_sleep(command, false);
-          break;
-        case Q_REAL_SLEEP:
-          do_sleep(command, true);
+          do_sleep(command);
           break;
         case Q_WAIT_FOR_SLAVE_TO_STOP:
           do_wait_for_slave_to_stop(command);

mysql-test/extra/rpl_tests/rpl_row_001.test

@@ -29,7 +29,7 @@ connection master;
 #
 # Give slave time to do at last one failed connect retry
 # This one must be short so that the slave will not stop retrying
-real_sleep 2;
+sleep 2;
 SET PASSWORD FOR root@"localhost" = '';
 # Give slave time to connect (will retry every second)
 sleep 2;

mysql-test/extra/rpl_tests/rpl_seconds_behind_master_mts_logical_clock.test

@@ -67,7 +67,7 @@ let $wait_condition= SELECT count(*) = 0 FROM INFORMATION_SCHEMA.PROCESSLIST WHE
 --source include/wait_condition.inc
 
 # Sleep on slave so we were at least 3 seconds behind the master
---real_sleep 3
+--sleep 3
 --source include/wait_for_mts_checkpoint.inc
 
 let $sbm= query_get_value("SHOW SLAVE STATUS", Seconds_Behind_Master, 1);
@@ -148,7 +148,7 @@ let $wait_condition= SELECT count(*) = 0 FROM INFORMATION_SCHEMA.PROCESSLIST WHE
 --source include/wait_condition.inc
 
 # Sleep for 2 seconds so Seconds_Behind_Master was at least 2
---real_sleep 2
+--sleep 2
 
 --source include/wait_for_mts_checkpoint.inc
 
@@ -244,7 +244,7 @@ let $wait_condition= SELECT count(*) = 0 FROM INFORMATION_SCHEMA.PROCESSLIST WHE
 --source include/wait_condition.inc
 
 # Wait for 2 seconds so Second_Behind_Master is at least 2
---real_sleep 2
+--sleep 2
 --source include/wait_for_mts_checkpoint.inc
 
 let $sbm= query_get_value("SHOW SLAVE STATUS", Seconds_Behind_Master, 1);
@@ -259,7 +259,7 @@ let $assert_cond= 2 <= $sbm AND $sbm <= $upper_bound;
 connection slave3;
 UNLOCK TABLES;
 
---real_sleep 1
+--sleep 1
 
 connection slave;
 # Wait till worker on second_test db finishes
@@ -294,7 +294,7 @@ let $wait_condition= SELECT count(*) = 0 FROM INFORMATION_SCHEMA.PROCESSLIST WHE
                                                                              OR State = 'update';
 --source include/wait_condition.inc
 
---real_sleep 1
+--sleep 1
 
 --source include/wait_for_mts_checkpoint.inc
 
@@ -316,7 +316,7 @@ let $wait_condition= SELECT count(*) = 3 FROM INFORMATION_SCHEMA.PROCESSLIST WHE
 # All catched up Seconds_Behind_Master should be 0. Lets wait some more to see if it does not increase
 # Seconds_Behind_Master
 
---real_sleep 1
+--sleep 1
 --source include/wait_for_mts_checkpoint.inc
 
 let $sbm= query_get_value("SHOW SLAVE STATUS", Seconds_Behind_Master, 1);

mysql-test/extra/rpl_tests/rpl_seconds_behind_master_mts_type_database.test

@@ -44,12 +44,12 @@ USE test;
 let $start= `SELECT UNIX_TIMESTAMP()`;
 INSERT INTO t1 VALUES (1);
 
---real_sleep 3
+--sleep 3
 
 USE test2;
 let $start2= `SELECT UNIX_TIMESTAMP()`;
 INSERT INTO t2 VALUES (1);
---real_sleep 2
+--sleep 2
 
 # Wait till all events are written to relay-log
 --source include/sync_slave_io_with_master.inc
@@ -127,12 +127,12 @@ USE test;
 let $start= `SELECT UNIX_TIMESTAMP()`;
 INSERT INTO t1 VALUES (1);
 
---real_sleep 3
+--sleep 3
 
 USE test2;
 let $start2= `SELECT UNIX_TIMESTAMP()`;
 INSERT INTO t2 VALUES (1);
---real_sleep 2
+--sleep 2
 
 # Wait till all events are written to relay-log
 --source include/sync_slave_io_with_master.inc
@@ -193,16 +193,16 @@ let $start= `SELECT UNIX_TIMESTAMP()`;
 
 USE test;
 INSERT INTO t1 VALUES (1);
---real_sleep 3
+--sleep 3
 
 use test2;
 INSERT INTO t2 VALUES (1);
---real_sleep 2
+--sleep 2
 
 USE test3;
 let $start3= `SELECT UNIX_TIMESTAMP()`;
 INSERT INTO t3 VALUES (1);
---real_sleep 2
+--sleep 2
 
 --source include/sync_slave_io_with_master.inc
 

mysql-test/extra/rpl_tests/rpl_semi_sync_deadlock.test

@@ -46,7 +46,7 @@ while ($i < $n)
 
 --connection master1
 SET DEBUG_SYNC= "before_rotate_binlog SIGNAL signal.continue";
---real_sleep 3
+--sleep 3
 --echo # Rotate binlog file
 FLUSH LOGS;
 

mysql-test/include/connect2.inc

@@ -40,7 +40,7 @@ while ($wait_counter)
     }
     if ($error)
     {
-        real_sleep 0.1;
+        sleep 0.1;
         dec $wait_counter;
     }
 }

mysql-test/include/wait_condition.inc

@@ -54,7 +54,7 @@ while ($wait_counter)
     }
     if (!$success)
     {
-        real_sleep 0.1;
+        sleep 0.1;
         dec $wait_counter;
     }
 }

mysql-test/include/wait_condition_sp.inc

@@ -47,7 +47,7 @@ while ($wait_counter)
     }
     if (!$success)
     {
-        real_sleep 0.1;
+        sleep 0.1;
         dec $wait_counter;
     }
 }

mysql-test/include/wait_condition_with_sql.inc

@@ -51,7 +51,7 @@ while ($wait_counter)
     }
     if (!$success)
     {
-        real_sleep 0.1;
+        sleep 0.1;
         dec $retry_counter;
     }
   }

mysql-test/include/wait_for_binlog_event.inc

@@ -28,7 +28,7 @@ while (`SELECT INSTR("$_last_event","$wait_binlog_event") = 0`)
     --source include/show_rpl_debug_info.inc
     --die ERROR: failed while waiting for $wait_binlog_event in binlog 
   }
-  real_sleep 0.1;
+  sleep 0.1;
   let $_event= query_get_value($_show_events_query, Info, $_event_pos);
   let $_last_event= $_event;
   while ($_event != "No such row")

mysql-test/include/wait_innodb_all_purged.inc

@@ -57,7 +57,7 @@ WHERE VARIABLE_NAME = 'INNODB_PURGE_VIEW_TRX_ID_AGE';`;
     if (!$success)
     {
         set global innodb_purge_run_now=ON;
-        real_sleep 0.1;
+        sleep 0.1;
         dec $wait_counter;
     }
 }

mysql-test/include/wait_show_condition.inc

@@ -70,7 +70,7 @@ if ($wait_for_all != 1)
   while (`SELECT UNIX_TIMESTAMP() <= $max_end_time AND $found = 0`)
   {
      # Sleep a bit to avoid too heavy load.
-     real_sleep 0.2;
+     sleep 0.2;
      let $rowno= 1;
      let $process_result= 1;
      let $do_loop= 1;
@@ -103,7 +103,7 @@ if ($wait_for_all == 1)
   while (`SELECT UNIX_TIMESTAMP() <= $max_end_time AND $found = 0`)
   {
      # Sleep a bit to avoid too heavy load.
-     real_sleep 0.2;
+     sleep 0.2;
      let $rowno= 1;
      let $process_result= 1;
      let $do_loop= 1;

mysql-test/include/wait_until_count_sessions.inc

@@ -113,7 +113,7 @@ while ($wait_counter)
    }
    if (!$success)
    {
-      real_sleep 0.1;
+      sleep 0.1;
       dec $wait_counter;
    }
 }

mysql-test/include/wait_until_undo_space_is_empty.inc

@@ -40,7 +40,7 @@ while ($wait_seconds)
     }
     if (!$success_wait)
     {
-        real_sleep 0.1;
+        sleep 0.1;
     }
     dec $repeat;
   }