framlog commented on a change in pull request #12358:
URL: https://github.com/apache/arrow/pull/12358#discussion_r801187688
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File path: cpp/src/arrow/util/mutex.cc
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@@ -50,5 +55,31 @@ Mutex::Guard Mutex::Lock() {
Mutex::Mutex() : impl_(new Impl, [](Impl* impl) { delete impl; }) {}
+#ifndef _WIN32
+namespace {
+
+struct AfterForkState {
+ // A global instance that will also register the atfork handler when
+ // constructed.
+ static AfterForkState instance;
+
+ // The mutex may be used at shutdown, so make it eternal.
+ // The leak (only in child processes) is a small price to pay for robustness.
+ Mutex* mutex = nullptr;
Review comment:
nit: Maybe it's not trivial when working with multiprocessing in Python.
Why not use a `unique_ptr` here?
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