Re: [COMMITTERS] pgsql: Allow Pin/UnpinBuffer to operate in a lockfree manner.

Andres Freund <andres@anarazel.de> writes:
> On 2016-04-12 00:32:13 -0400, Tom Lane wrote:
>> Apparently, assigning the result of init_spin_delay() is not as portable
>> as you thought.

> Hm. I'm not sure why not though? Is it because delayStatus isn't static
> or global scope?

It looks like that compiler adheres to the C89 restriction that an
initializer for an array or struct must contain only link-time-constant
expressions, even if the target object is of dynamic scope.
The macro works with a link-time-constant pointer argument, but not
with one that must be evaluated at runtime.
        regards, tom lane