Hi, clock_gettime i believe was made native available in macOS Sierra (10.12).
prior versions though don't afaik. Though with the aggressive upgrade of OSX on apple devices that apple push, to end users is this really a concern? As per posix guidance also, what you suggest is also recommended as gettimeofday is obsolescent. http://pubs.opengroup.org/onlinepubs/9699919799/functions/gettimeofday.html Regards Mike ________________________________________ From: Paul Guo <[email protected]> Sent: Monday, April 24, 2017 6:36 AM To: [email protected] Subject: s/gettimeofday/clock_gettime/ in hawq? Hi, HAWQ sometimes use gettimeofday() syscall for some timeout check in various module, however it could be affected by ntp, so the timeout checking logic could be wrong sometimes. I would propose to use clock_gettime() to replace it on Linux (I have not investigated the alternative on other platforms e.g. mac). Both gettimeofday() and clock_gettime() are fast vdso sys call so I do not expect there is performance loss in some case where there are frequent calls of gettimeofday(). By the way, I found some gettimeofday() calls on postgresql and gpdb, so they might have this issue also. Regards, Paul The information contained in this email is strictly confidential and for the use of the addressee only, unless otherwise indicated. If you are not the intended recipient, please do not read, copy, use or disclose to others this message or any attachment. Please also notify the sender by replying to this email or by telephone (+44(020 7896 0011) and then delete the email and any copies of it. Opinions, conclusion (etc) that do not relate to the official business of this company shall be understood as neither given nor endorsed by it. IG is a trading name of IG Markets Limited (a company registered in England and Wales, company number 04008957) and IG Index Limited (a company registered in England and Wales, company number 01190902). Registered address at Cannon Bridge House, 25 Dowgate Hill, London EC4R 2YA. Both IG Markets Limited (register number 195355) and IG Index Limited (register number 114059) are authorised and regulated by the Financial Conduct Authority.
