pitrou commented on a change in pull request #9633:
URL: https://github.com/apache/arrow/pull/9633#discussion_r587752941
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File path: cpp/src/arrow/flight/server.cc
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@@ -899,6 +921,13 @@ Status FlightServerBase::Serve() {
ARROW_ASSIGN_OR_RAISE(old_handler, SetSignalHandler(signum, new_handler));
impl_->old_signal_handlers_.push_back(std::move(old_handler));
}
+#ifndef _WIN32
+ if (sem_init(&impl_->waiting_sem_, /*pshared=*/0, /*value=*/0) != 0) {
Review comment:
Unfortunately I don't think macOS supports anonymous semaphores.
An alternative would be to use a non-blocking anonymous pipe. `write` is
async-signal-safe.
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