MBug#643463: slow XtraDB shutdown due to 10 second sleep in purge thread

Implement os_event_wait_time() for POSIX systems.

In the purge thread, use os_event_wait_time() when sleeping rather than sleep,
and signal the event when server shuts down, so we do not need to wait for
upto 10 seconds until the purge thread wakes up.

Also fix bug that warnings that were pushed after we call set_ok_status() were
not included in the waning count sent to the client in the result packet.

Also in mysqltest, in recursive die() invocation at least print the message
before aborting.

client/mysqltest.cc:
  If we detect recursive die(), at least print the message before aborting.
mysql-test/r/warnings_debug.result:
  Test case.
mysql-test/t/warnings_debug.test:
  Test case.
sql/handler.cc:
  Force generation of a warning with specific debug option, for testing.
sql/protocol.cc:
  Fix wrong DBUG_ENTER
sql/sql_class.h:
  Add method to count warnings pushed after set_ok_status() is called.
sql/sql_error.cc:
  Also count warnings pushed after set_ok_status() is called.
storage/xtradb/include/os0sync.h:
  Implement working os_sync_wait_time() for POSIX.
storage/xtradb/include/srv0srv.h:
  Make the purge thread wait for an event when sleeping, so we can signal it to
  wakeup immediately at shutdown.
storage/xtradb/log/log0log.c:
  Make the purge thread wait for an event when sleeping, so we can signal it to
  wakeup immediately at shutdown.
storage/xtradb/os/os0sync.c:
  Implement working os_sync_wait_time() for POSIX.
storage/xtradb/srv/srv0srv.c:
  Make the purge thread wait for an event when sleeping, so we can signal it to
  wakeup immediately at shutdown.

1 files changed, 10 insertions, 0 deletions

diff --git a/mysql-test/r/warnings_debug.result b/mysql-test/r/warnings_debug.result
new file mode 100644
index 00000000000..08908bf0437
--- /dev/null
+++ b/mysql-test/r/warnings_debug.result
@@ -0,0 +1,10 @@
+drop table if exists t1;
+create table t1 (a int primary key) engine=innodb;
+SET SESSION debug="+d,warn_during_ha_commit_trans";
+INSERT INTO t1 VALUES (1);
+Warnings:
+Warning	1196	Some non-transactional changed tables couldn't be rolled back
+SHOW WARNINGS;
+Level	Code	Message
+Warning	1196	Some non-transactional changed tables couldn't be rolled back
+drop table t1;