rust-update: handle SIGINT from long-running update threads
The current code does not respond to ^C until after the Rust bit is finished
doing its work. This is expected, since Rust holds the GIL for the duration
of the call and does not call `PyErr_CheckSignals`. Freeing the GIL to do our
work does not really improve anything since the Rust threads are still going,
and the only way of cancelling a thread is by making it cooperate.
So we do the following:
- remember the SIGINT handler in hg-cpython and reset it after the call
into core (see inline comment in `update.rs` about this)
- make all update threads watch for a global `AtomicBool` being `true`,
and if so stop their work
- reset the global bool and exit early (i.e. before writing the dirstate)
- raise SIGINT from `hg-cpython` if update returns `InterruptReceived`
// ancestors.rs
//
// Copyright 2018 Georges Racinet <gracinet@anybox.fr>
//
// This software may be used and distributed according to the terms of the
// GNU General Public License version 2 or any later version.
//! Bindings for Rust errors
//!
//! [`GraphError`] exposes `hg::GraphError` as a subclass of `ValueError`
//! but some variants of `hg::GraphError` can be converted directly to other
//! existing Python exceptions if appropriate.
//!
//! [`GraphError`]: struct.GraphError.html
use cpython::{
exc::{RuntimeError, ValueError},
py_exception, PyErr, Python,
};
use hg;
use crate::PyRevision;
py_exception!(rustext, GraphError, ValueError);
impl GraphError {
pub fn pynew(py: Python, inner: hg::GraphError) -> PyErr {
match inner {
hg::GraphError::ParentOutOfRange(r) => {
GraphError::new(py, ("ParentOutOfRange", PyRevision(r.0)))
}
}
}
pub fn pynew_from_vcsgraph(
py: Python,
inner: vcsgraph::graph::GraphReadError,
) -> PyErr {
match inner {
vcsgraph::graph::GraphReadError::InconsistentGraphData => {
GraphError::new(py, "InconsistentGraphData")
}
vcsgraph::graph::GraphReadError::InvalidKey => {
GraphError::new(py, "ParentOutOfRange")
}
vcsgraph::graph::GraphReadError::KeyedInvalidKey(r) => {
GraphError::new(py, ("ParentOutOfRange", r))
}
vcsgraph::graph::GraphReadError::WorkingDirectoryUnsupported => {
match py
.import("mercurial.error")
.and_then(|m| m.get(py, "WdirUnsupported"))
{
Err(e) => e,
Ok(cls) => PyErr::from_instance(py, cls),
}
}
}
}
}
py_exception!(rustext, HgPathPyError, RuntimeError);
py_exception!(rustext, FallbackError, RuntimeError);
py_exception!(shared_ref, AlreadyBorrowed, RuntimeError);