refactor(rust): Allow polars to pass cargo check on windows (#18498)

.gitignore

@@ -1,5 +1,6 @@
 *.iml
 *.so
+*.pyd
 *.ipynb
 .ENV
 .env

crates/polars-io/src/mmap.rs

@@ -1,13 +1,20 @@
+#[cfg(target_family = "unix")]
 use std::collections::btree_map::Entry;
+#[cfg(target_family = "unix")]
 use std::collections::BTreeMap;
 use std::fs::File;
 use std::io::{BufReader, Cursor, Read, Seek};
-use std::sync::{Arc, Mutex};
+use std::sync::Arc;
+#[cfg(target_family = "unix")]
+use std::sync::Mutex;
 
 use memmap::Mmap;
+#[cfg(target_family = "unix")]
 use once_cell::sync::Lazy;
 use polars_core::config::verbose;
-use polars_error::{polars_bail, PolarsResult};
+#[cfg(target_family = "unix")]
+use polars_error::polars_bail;
+use polars_error::PolarsResult;
 use polars_utils::mmap::MemSlice;
 
 // Keep track of memory mapped files so we don't write to them while reading
@@ -60,7 +67,7 @@ impl Drop for MMapSemaphore {
     }
 }
 
-pub fn ensure_not_mapped(file: &File) -> PolarsResult<()> {
+pub fn ensure_not_mapped(#[allow(unused)] file: &File) -> PolarsResult<()> {
     #[cfg(target_family = "unix")]
     {
         use std::os::unix::fs::MetadataExt;

crates/polars-python/src/file.rs

@@ -1,5 +1,7 @@
 use std::borrow::Cow;
-use std::fs::{self, File};
+#[cfg(target_family = "unix")]
+use std::fs;
+use std::fs::File;
 use std::io;
 use std::io::{Cursor, ErrorKind, Read, Seek, SeekFrom, Write};
 #[cfg(target_family = "unix")]

crates/polars-utils/src/mem.rs

@@ -54,13 +54,13 @@ pub fn prefetch_l2(slice: &[u8]) {
 }
 
 /// `madvise()` with `MADV_SEQUENTIAL` on unix systems. This is a no-op on non-unix systems.
-pub fn madvise_sequential(slice: &[u8]) {
+pub fn madvise_sequential(#[allow(unused)] slice: &[u8]) {
     #[cfg(target_family = "unix")]
     madvise(slice, libc::MADV_SEQUENTIAL);
 }
 
 /// `madvise()` with `MADV_WILLNEED` on unix systems. This is a no-op on non-unix systems.
-pub fn madvise_willneed(slice: &[u8]) {
+pub fn madvise_willneed(#[allow(unused)] slice: &[u8]) {
     #[cfg(target_family = "unix")]
     madvise(slice, libc::MADV_WILLNEED);
 }