[jira] [Created] (ARROW-17975) [C++] Create after-fork facility

["Antoine Pitrou (Jira)" <ji...@apache.org>]

Antoine Pitrou created ARROW-17975:
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             Summary: [C++] Create after-fork facility
                 Key: ARROW-17975
                 URL: https://issues.apache.org/jira/browse/ARROW-17975
             Project: Apache Arrow
          Issue Type: Wish
          Components: C++
            Reporter: Antoine Pitrou


Currently, to ensure fork safety when dealing with system resources, we add hand-baked getpid() tests in relevant APIs.

We could instead have a centralized after-fork facility such as:
{code:c++}
AfterForkToken RegisterAtFork(std::function<void()> after_fork);
{code}

The returned token would have to be kept alive for as long as the after-fork callbacks are to be registered.

(a more elaborate overload with before-fork, after-fork-in-parent, after-fork-in-child callbacks could also be added if necessary)




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