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<p style="margin: 10px 0 0 0">The locking around the filestamp is probably just me being paranoid, I don't really know what's safe or not safe to do with primitive variables so I default to conservatively locking things.</p>
<p style="margin: 10px 0 0 0">I think it would be really hard to predict the benefit of the additional write lock without a lot of testing.</p>
<p style="margin: 10px 0 0 0">The notion of "validity" here isn't really binary. The reloading just means you can slipstream changes, but both states are valid, and moving the reload to the background thread for performance means that the SP no longer has any control over when an update happens to take effect. If you want control, you don't use this feature and you restart the processes.</p>
<p style="margin: 10px 0 0 0">One substantive point: I believe the comment in the reload task is wrong: it's not elevating to a write lock when it updates the timestamp, that's a fresh lock. If you know that it's safe to update the variable, I'm not sure I wouldn't just remove the locking there. If that improves readability, I say go for it.</p>
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