[PATCH] os: Fix timer race conditions

[Keith Packard]

> Keith, any chance of getting this in for 1.17?  I know you expressed 
> reservations about it, but the current code definitely corrupts the 
> timer list and is affecting a bunch of people, so this patch is 
> certainly better than nothing.

Yeah, it's an ugly little bit of code, and still seems prone to racing
when the timer list is modified from a timer callback. This reduces the
window, but doesn't close it.

But, as you say, it seems better than the current code.

-- 
keith.packard at intel.com
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