#326 The Mutex code without using flock()

[naoki iimura]

I've implemented the Mutex code without using flock().
This code use mkdir() for exclusive control.

The code passed the test suite (TestMutex.tst) on
Windows 98 and Mac OS X 10.3.6.
Here is the result of the test suite:

Running TestMutex.tst... at line: | 5ok (7 ok)

7 tests, 7 ok, 0 failed

Naoki

[naoki iimura]

POPFile/Mutex.pm diff from 0.22.2RC2

[naoki iimura]

POPFile/Mutex.pm implemented without flock()

[John Graham-Cumming]

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I have tested this on Linux and Windows 2000 and committed
it. Thanks, I was thinking about doing it this way but you
beat me to it!

John.