@hfinkel wrote:

> Sure, but that has little to do with what POSIX calls its 'monotonic clock'.


Sorry, I used the wrong terminology. The C++ standard **requires** (and large 
portions of libc++ depend on), the existence of `std::steady_clock`, which is a 
clock which only moves forward; and does so in real time.  (so reading from a 
non-steady clock, and then returning the max value you've ever seen is not 
satisfactory).

An easy way to implement that on POSIX is to use 
`clock_gettime(CLOCK_MONOTONIC, &tp)`.


http://reviews.llvm.org/D8253

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