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Remove runtime stderr warning from Python bindings #1898

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Merged
ArthurZucker merged 3 commits into from
Nov 28, 2025
Merged

Remove runtime stderr warning from Python bindings #1898

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9260b06
Initial plan
Copilot Nov 28, 2025
f752c9b
Remove runtime stderr warning from Python bindings
Copilot Nov 28, 2025
819e479
Update comment to reflect the new behavior after removing warning
Copilot Nov 28, 2025
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11 changes: 1 addition & 10 deletions bindings/python/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -37,22 +37,13 @@ pub const VERSION: &str = env!("CARGO_PKG_VERSION");

// For users using multiprocessing in python, it is quite easy to fork the process running
// tokenizers, ending up with a deadlock because we internally make use of multithreading. So
// we register a callback to be called in the event of a fork so that we can warn the user.
// we register a callback to be called in the event of a fork to disable parallelism.
#[cfg(target_family = "unix")]
static mut REGISTERED_FORK_CALLBACK: bool = false;
#[cfg(target_family = "unix")]
extern "C" fn child_after_fork() {
use tk::parallelism::*;
if has_parallelism_been_used() && !is_parallelism_configured() {
eprintln!(
"huggingface/tokenizers: The current process just got forked, after parallelism has \
already been used. Disabling parallelism to avoid deadlocks..."
);
eprintln!("To disable this warning, you can either:");
eprintln!(
"\t- Avoid using `tokenizers` before the fork if possible\n\
\t- Explicitly set the environment variable {ENV_VARIABLE}=(true | false)"
);
set_parallelism(false);
}
}
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