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annotate rust/hg-cpython/src/dagops.rs @ 43175:a1908eb08342

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rust-cpython: mark PySharedState as Sync so &'PySharedState can be Send The goal is to store &'static PySharedState in $leaked struct, which allows us to move the $leaked struct out of the macro. Currently, it depends on inner.$data_member(py), which can't be generalized. PySharedState is Sync because any mutation or read operation is synchronized by the Python GIL, py: Python<'a>, which should guarantee that &'PySharedState can be sent to another thread.
author Yuya Nishihara <yuya@tcha.org>
date Tue, 17 Sep 2019 07:59:25 +0900
parents 326fdce22fb2
children 33fe96a5c522
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1 // dagops.rs
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2 //
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3 // Copyright 2019 Georges Racinet <georges.racinet@octobus.net>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 //! Bindings for the `hg::dagops` module provided by the
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9 //! `hg-core` package.
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10 //!
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11 //! From Python, this will be seen as `mercurial.rustext.dagop`
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12 use crate::{
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13 cindex::Index,
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14 conversion::{py_set, rev_pyiter_collect},
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15 exceptions::GraphError,
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16 };
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17 use cpython::{PyDict, PyModule, PyObject, PyResult, Python};
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18 use hg::dagops;
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19 use hg::Revision;
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20 use std::collections::HashSet;
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21
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22 /// Using the the `index`, return heads out of any Python iterable of Revisions
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23 ///
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24 /// This is the Rust counterpart for `mercurial.dagop.headrevs`
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25 pub fn headrevs(
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26 py: Python,
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27 index: PyObject,
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28 revs: PyObject,
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29 ) -> PyResult<PyObject> {
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30 let mut as_set: HashSet<Revision> = rev_pyiter_collect(py, &revs)?;
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31 dagops::retain_heads(&Index::new(py, index)?, &mut as_set)
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32 .map_err(|e| GraphError::pynew(py, e))?;
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33 py_set(py, &as_set)
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34 }
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35
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36 /// Create the module, with `__package__` given from parent
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37 pub fn init_module(py: Python, package: &str) -> PyResult<PyModule> {
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38 let dotted_name = &format!("{}.dagop", package);
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39 let m = PyModule::new(py, dotted_name)?;
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40 m.add(py, "__package__", package)?;
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41 m.add(py, "__doc__", "DAG operations - Rust implementation")?;
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42 m.add(
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43 py,
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44 "headrevs",
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45 py_fn!(py, headrevs(index: PyObject, revs: PyObject)),
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46 )?;
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47
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48 let sys = PyModule::import(py, "sys")?;
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49 let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?;
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50 sys_modules.set_item(py, dotted_name, &m)?;
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51 // Example C code (see pyexpat.c and import.c) will "give away the
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52 // reference", but we won't because it will be consumed once the
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53 // Rust PyObject is dropped.
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54 Ok(m)
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55 }