Re: Status of 64 bit atomics - Mailing list pgsql-hackers

From Arthur Silva
Subject Re: Status of 64 bit atomics
Date
Msg-id CAO_YK0XSEu8-zcQgYDyvUgtOi1i6QzW_+uqFv1rRtAQHOJUxOw@mail.gmail.com
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In response to Status of 64 bit atomics  (John Gorman <johngorman2@gmail.com>)
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On May 27, 2016 5:01 PM, "John Gorman" <johngorman2@gmail.com> wrote:
>
> Hi All
>
> Someone recently told me that the postgresql atomics library was incomplete
> for 64 bit operations such as pg_atomic_fetch_add_u64() and should not be used.
>
> Can someone definitively confirm whether it is okay to rely on the 64 bit atomics
> or whether it is better to protect 64 bit operations with a spinlock?
>
> Thanks!
> John

Golang has asm implementations for these even on 32bit platforms (see https://github.com/golang/go/tree/master/src/sync/atomic).

Couldn't we borrow them? Or even better, fall back to spin lock on these, but transparently.

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