paleolimbot commented on PR #14250:
URL: https://github.com/apache/arrow/pull/14250#issuecomment-1315604524
Ok, here's the print output:
```
> library(arrow, warn.conflicts = FALSE)
arrow::SetSignalStopSource()
Some features are not enabled in this build of Arrow. Run `arrow_info()` for
more information.
> tf <- tempfile()
> write.csv(mtcars, tf, row.names = FALSE)
> # before calling anything with the cancellation api, everything works
> x <- parallel::mclapply(1:2, function(...) {
+ read_csv_arrow(tf)
+ })
arrow::RegisterCancellingSignalHandler({SIGINT});
arrow::RegisterCancellingSignalHandler({SIGINT});
arrow::UnregisterCancellingSignalHandler();
stop_source_->Reset();
arrow::UnregisterCancellingSignalHandler();
stop_source_->Reset();
> # invoke cancellation in the main process
> x <- read_csv_arrow(tf)
arrow::RegisterCancellingSignalHandler({SIGINT});
arrow::UnregisterCancellingSignalHandler();
stop_source_->Reset();
> # this hangs
> x <- parallel::mclapply(1:2, function(...) {
+ read_csv_arrow(tf)
+ })
arrow::RegisterCancellingSignalHandler({SIGINT});
arrow::RegisterCancellingSignalHandler({SIGINT});
```
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