[HACKERS] Microseconds granularity SIGALRM interrupt support

[NikhilS]

Hi,

Currently we have enable_sig_alarm() which provides millisecond level granularity in specifying delay. I tried using it by just specifying nonzero value for the timeval.it_value.tv_usec field before calling setitimer, but didn't seem to work well.

Do we have any function in the postgres codebase which provides microseconds level of delay coupled with SIGALRM support?

Regards,
Nikhils
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