Fixed bug #16167

Added --use-threads option for porting to Windows. 


client/mysqlslap.c:
  Addinng thread option for porting to windows (second piece of code)
  Also added flush call to fix one bug
mysql-test/r/mysqlslap.result:
  New results
mysql-test/t/disabled.def:
  Bug 16167 should not be fixed
mysql-test/t/mysqlslap.test:
  Added test for new use-threads option

client/mysqlslap.c

@@ -982,6 +982,7 @@ run_scheduler(stats *sptr, statement *stmts, uint concur, ulonglong limit)
   }
   else
   {
+    fflush(NULL);
     for (x= 0; x < concur; x++)
     {
       int pid;
@@ -1026,10 +1027,19 @@ run_scheduler(stats *sptr, statement *stmts, uint concur, ulonglong limit)
 
   gettimeofday(&start_time, NULL);
 
-  my_close(lock_file, MYF(0));
-
+  /*
+    We look to grab a write lock at this point. Once we get it we know that
+    all clients have completed their work.
+  */
   if (opt_use_threads)
   {
+    if (my_lock(lock_file, F_WRLCK, 0, F_TO_EOF, MYF(0)))
+    {
+      fprintf(stderr,"%s: Could not get lockfile\n",
+              my_progname);
+      exit(0);
+    }
+    my_lock(lock_file, F_UNLCK, 0, F_TO_EOF, MYF(0));
   }
   else
   {
@@ -1043,6 +1053,8 @@ run_scheduler(stats *sptr, statement *stmts, uint concur, ulonglong limit)
   }
   gettimeofday(&end_time, NULL);
 
+  my_close(lock_file, MYF(0));
+
   sptr->timing= timedif(end_time, start_time);
   sptr->users= concur;
   sptr->rows= limit;

mysql-test/t/disabled.def

@@ -19,6 +19,5 @@ innodb_concurrent : Results are not deterministic, Elliot will fix (BUG#3300)
 subselect       : Bug#15706
 type_time       : Bug#15805
 rpl_ddl         : Bug#15963 SBR does not show "Definer" correctly
-mysqlslap       : Bug#16167
 events          : Affects flush test case. A table lock not released somewhere
 rpl_sp          : Bug #16456

mysql-test/t/mysqlslap.test

@@ -4,6 +4,8 @@
 
 --exec $MYSQL_SLAP --silent --concurrency=5 --iterations=20 --number-int-cols=2 --number-char-cols=3 --auto-generate-sql
 
+--exec $MYSQL_SLAP --silent --concurrency=5 --iterations=20 --number-int-cols=2 --number-char-cols=3 --auto-generate-sql --use-threads
+
 --exec $MYSQL_SLAP --only-print --iterations=20  --query="select * from t1" --create="CREATE TABLE t1 (id int, name varchar(64)); INSERT INTO t1 VALUES (1, 'This is a test')" --delimiter=";"
 --exec $MYSQL_SLAP --silent --concurrency=5 --iterations=20 --query="select * from t1" --create="CREATE TABLE t1 (id int, name varchar(64)); INSERT INTO t1 VALUES (1, 'This is a test')" --delimiter=";"