A question about flock

 From the flock man page:

[snip]
- Parameters
-- operation
--- LOCK_NB if you don't want flock() to block while locking. (not supported on Windows)

But in win32/flock.c, the LOCK_NB flag is turned in LOCKFILE_FAIL_IMMEDIATELY

 From the LockFileEx man page (http://msdn.microsoft.com/en-us/library/aa365203%28VS.85%29.aspx):

"If the file handle was not opened for asynchronous I/O and the lock is not available, this call waits until the lock is granted or an error occurs, unless the 
LOCKFILE_FAIL_IMMEDIATELY flag is specified"

Since I see no trace of FILE_FLAG_OVERLAPPED in the win32 dir, i suppose async IO is not used in php, hence the LOCK_NB should actually work.

Is this correct or am I missing something?

I might of course test on my machine, but I might be missing some weird os/fs combo where the results are different.

Thanks
Gaetano

PS: while at it, one more question - is LockFileEx supported transparently over smb?