Use nanosleep() for pg_usleep() on Unix/Linux?

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От	Paul Guo
Тема	Use nanosleep() for pg_usleep() on Unix/Linux?
Дата	11 сентября 2016 г. 10:56:58
Msg-id	CABQrizfxpBLZT5mZeE0js5oCh1tqEWvcGF3vMRCv5P-RwUY5dQ@mail.gmail.com обсуждение исходный текст
Ответы	Re: Use nanosleep() for pg_usleep() on Unix/Linux?
Список	pgsql-hackers

I happened to read the pg_usleep() code recently. I'm wondering

if we could implement it using the posix function nanosleep(),

instead of by select().

nanosleep() is designed with higher time resolution, besides it provide

remaining time if is interrupted by signal so that pg_usleep() could

be implemented more accurately.

The code for pg_usleep() could be similar like this:

while(nanosleep(&req,&req)==-1 && errno == EINTR)

continue;

or combine with clock_gettime() to control the sleep time more accurately.

Regards,

Paul

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