Re: fix pg_mkdir_p to tolerate concurrent directory creation

On 2026-Jun-18, Andrew Dunstan wrote:

> 
> While working on the pytest stuff, I found this issue when making it work on
> Windows, but the issue can exist everywhere. pg_mkdir_p can fail if there is
> a concurrent directory creation. This patch makes it tolerant of concurrent
> directory creation.

Hmm, should the 'break's in the loop be 'continue's?  If you're creating
path a/b/c, and a concurrent process beats you but is only attempting to
do a/b, then with the break you'll fail to create the final c.

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