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Use nanosleep() for pg_usleep() on Unix/Linux? - Mailing list pgsql-hackers

From	Paul Guo
Subject	Use nanosleep() for pg_usleep() on Unix/Linux?
Date	September 11, 2016 13:56:58
Msg-id	CABQrizfxpBLZT5mZeE0js5oCh1tqEWvcGF3vMRCv5P-RwUY5dQ@mail.gmail.com Whole thread Raw
Responses	Re: Use nanosleep() for pg_usleep() on Unix/Linux? (Tom Lane <tgl@sss.pgh.pa.us>)
List	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

From: Mark Kirkwood
Date: 11 September 2016, 12:31:30
Subject: Re: Write Ahead Logging for Hash Indexes

From: Craig Ringer
Date: 11 September 2016, 14:42:42
Subject: Re: Override compile time log levels of specific messages/modules