[ARROW-17975] [C++] Create after-fork facility

• Type: Wish
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 11.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/33182
• Assignee: Antoine Pitrou
• Reporter: Antoine Pitrou
• Created: 10/Oct/22 15:40
• Updated: 11/Jan/23 11:57
• Resolved: 07/Nov/22 17:19

Description

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:

AfterForkToken RegisterAtFork(std::function<void()> after_fork);

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)

Issue Links

• is related to: ARROW-17859 [C++] Use self-pipe in signal-receiving StopSource
• is required by: ARROW-18271 [C++] Remove GlobalForkSafeMutex
• links to: GitHub Pull Request #14594