Description:
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Excerpt from the IIS forum:
The session handler for WinCache doesn't appear to lock the session when session_start() is called like the default PHP session handlers. This can cause problems with two pages attempting to write to or read from the session at the same time, such as in an AJAX application. The default behavior of locking the entire session from when session_start() is called until the page finishes executing or session_write_close() is called is kinda heavy-handed, but the different way WinCache handles it unfortunately broke one of my web apps. Is there any chance that this can be fixed, with possibly an ini setting to lock or not lock the session? FYI, memcache fixed this same issue a bit over a year ago (http://pecl.php.net/package-changelog.php?package=memcache&release=3.0.4).

For details look at http://forums.iis.net/p/1170499/1953086.aspx#1953086

Reproduce code:
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Expected result:
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Actual result:
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