But according to the man sem_timedwait(3), the abs_timeout is subjected to 
the 
`discontinuous jumps in the system time (e.g., if the system administrator 
manually 
changes the clock)`, and `adjtime(3) & NTP`.

Imaging the system administrator manually put the clock say 10 seconds 
behind,
thus the `C.sema_timedwait ` is just nearly the same as the method 3 `long 
wait`.

On Monday, September 18, 2017 at 4:41:17 AM UTC+8, Tamás Gulácsi wrote:
>
> C.sema_timedwait ?
> No latency, and with a few seconds for timeout, not too long.

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