Don’t wait without a condition

Don’t wait without a condition

A wait without a condition can miss a wakeup or wake up simply to find that there is no work to do ^[1].

What you need to know (or remember) is that also std::timed_mutex::try_lock_for is allowed to fail spuriously and return false even if the mutex was not locked by any other thread at some point during timeout_duration ^[2].

Reference

1) https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cp42-dont-wait-without-a-condition 2) https://en.cppreference.com/w/cpp/thread/timed_mutex/try_lock_for