Applying InnoDB snapshot, fixes BUG#52102.

Detailed revision comments:

r6840 | calvin | 2010-03-19 00:32:23 +0200 (Fri, 19 Mar 2010) | 6 lines
branches/zip: Fix Bug #52102 InnoDB Plugin shows performance drop
comparing to builtin InnoDB (Windows only).

Disable Windows atomics by default.

Approved by: Inaam

storage/innodb_plugin/CMakeLists.txt

@@ -80,5 +80,9 @@ SET(INNODB_PLUGIN_SOURCES	btr/btr0btr.c btr/btr0cur.c btr/btr0pcur.c btr/btr0sea
 			usr/usr0sess.c
 			ut/ut0byte.c ut/ut0dbg.c ut/ut0mem.c ut/ut0rnd.c ut/ut0ut.c ut/ut0vec.c
 			ut/ut0list.c ut/ut0wqueue.c)
-ADD_DEFINITIONS(-DHAVE_WINDOWS_ATOMICS -DINNODB_RW_LOCKS_USE_ATOMICS -DHAVE_IB_PAUSE_INSTRUCTION)
+# Windows atomics do not perform well. Disable Windows atomics by default.
+# See bug#52102 for details.
+#ADD_DEFINITIONS(-DHAVE_WINDOWS_ATOMICS -DINNODB_RW_LOCKS_USE_ATOMICS -DHAVE_IB_PAUSE_INSTRUCTION)
+ADD_DEFINITIONS(-DHAVE_IB_PAUSE_INSTRUCTION)
+
 MYSQL_STORAGE_ENGINE(INNODB_PLUGIN)

storage/innodb_plugin/ChangeLog

+2010-03-18	The InnoDB Team
+
+	* CMakeLists.txt:
+	Fix Bug #52102 InnoDB Plugin shows performance drop comparing to
+	builtin InnoDB (Windows only).
+	Disable Windows atomics by default.
+
 2010-03-18	The InnoDB Team
 
 	* buf0buf.ic: