'adaptive_wait' has spurious wakeups on Windows

[elBoberido]

Brief feature description

adaptive_wait uses std::his_thread::sleep_for(INITIAL_WAITING_TIME) with 100µs for INITIAL_WAITING_TIME as second stage in the waiting strategy. This is done for around 10000 iterations before switching to the final waiting strategy with 10ms steps. On Windows this might result in immediate wakeups and a higher CPU load.

Potential fix

In order to fix the problem nanosleep could be used but unfortunately this is not available on Windows and it is pretty hard to reliably achieve sleep times below 1ms. There are a few option which can be explored

• https://learn.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-sleepex
• https://learn.microsoft.com/en-us/windows/win32/sync/using-waitable-timer-objects
• https://learn.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-setwaitabletimer