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As currently implemented, condition_variable always ultimately waits against std::chrono::system_clock. This clock can be changed in arbitrary ways by the user which may result in us waking up too early or too late when measured against the caller-supplied clock. We can't (yet) do much about waking up too late (PR 41861), but if we wake up too early we must return cv_status::no_timeout to indicate a spurious wakeup rather than incorrectly returning cv_status::timeout. 2018-08-01 Mike Crowe <mac@mcrowe.com> * include/std/condition_variable (wait_until): Only report timeout if we really have timed out when measured against the caller-supplied clock. * testsuite/30_threads/condition_variable/members/2.cc: Add test case to confirm above behaviour. From-SVN: r263224
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