Update MSRV to 1.63

.github/workflows/build.yml

@@ -54,7 +54,7 @@ jobs:
         name: Prepare LD_LIBRARY_PATH (Ubuntu only)
         run: echo LD_LIBRARY_PATH=${pythonLocation}/lib >> $GITHUB_ENV
 
-      - if: inputs.rust == '1.56.0'
+      - if: inputs.rust == '1.63.0'
         name: Prepare minimal package versions (MSRV only)
         run: nox -s set-minimal-package-versions
 

.github/workflows/ci.yml

@@ -47,7 +47,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.56.0
+          toolchain: 1.63.0
           targets: x86_64-unknown-linux-gnu
           components: rust-src
       - uses: actions/setup-python@v5
@@ -255,7 +255,7 @@ jobs:
           ]
         include:
           # Test minimal supported Rust version
-          - rust: 1.56.0
+          - rust: 1.63.0
             python-version: "3.12"
             platform:
               {

Cargo.toml

@@ -12,14 +12,12 @@ categories = ["api-bindings", "development-tools::ffi"]
 license = "MIT OR Apache-2.0"
 exclude = ["/.gitignore", ".cargo/config", "/codecov.yml", "/Makefile", "/pyproject.toml", "/noxfile.py", "/.github", "/tests/test_compile_error.rs", "/tests/ui"]
 edition = "2021"
-rust-version = "1.56"
+rust-version = "1.63"
 
 [dependencies]
 cfg-if = "1.0"
 libc = "0.2.62"
-parking_lot = ">= 0.11, < 0.13"
 memoffset = "0.9"
-portable-atomic = "1.0"
 
 # ffi bindings to the python interpreter, split into a separate crate so they can be used independently
 pyo3-ffi = { path = "pyo3-ffi", version = "=0.21.2" }
@@ -46,6 +44,9 @@ rust_decimal = { version = "1.0.0", default-features = false, optional = true }
 serde = { version = "1.0", optional = true }
 smallvec = { version = "1.0", optional = true }
 
+[target.'cfg(not(target_has_atomic = "64"))'.dependencies]
+portable-atomic = "1.0"
+
 [dev-dependencies]
 assert_approx_eq = "1.1.0"
 chrono = "0.4.25"

README.md

@@ -4,7 +4,7 @@
 [![benchmark](https://img.shields.io/badge/benchmark-✓-Green?logo=github)](https://pyo3.rs/dev/bench/)
 [![codecov](https://img.shields.io/codecov/c/gh/PyO3/pyo3?logo=codecov)](https://codecov.io/gh/PyO3/pyo3)
 [![crates.io](https://img.shields.io/crates/v/pyo3?logo=rust)](https://crates.io/crates/pyo3)
-[![minimum rustc 1.56](https://img.shields.io/badge/rustc-1.56+-blue?logo=rust)](https://rust-lang.github.io/rfcs/2495-min-rust-version.html)
+[![minimum rustc 1.63](https://img.shields.io/badge/rustc-1.63+-blue?logo=rust)](https://rust-lang.github.io/rfcs/2495-min-rust-version.html)
 [![discord server](https://img.shields.io/discord/1209263839632424990?logo=discord)](https://discord.gg/33kcChzH7f)
 [![contributing notes](https://img.shields.io/badge/contribute-on%20github-Green?logo=github)](https://github.com/PyO3/pyo3/blob/main/Contributing.md)
 
@@ -18,7 +18,7 @@
 
 PyO3 supports the following software versions:
   - Python 3.7 and up (CPython, PyPy, and GraalPy)
-  - Rust 1.56 and up
+  - Rust 1.63 and up
 
 You can use PyO3 to write a native Python module in Rust, or to embed Python in a Rust binary. The following sections explain each of these in turn.
 

build.rs

@@ -39,7 +39,7 @@ fn configure_pyo3() -> Result<()> {
         println!("{}", cfg)
     }
 
-    // Emit cfgs like `thread_local_const_init`
+    // Emit cfgs like `invalid_from_utf8_lint`
     print_feature_cfgs();
 
     Ok(())

guide/src/building-and-distribution.md

@@ -151,7 +151,7 @@ rustflags = [
 ]
 ```
 
-Alternatively, on rust >= 1.56, one can include in `build.rs`:
+Alternatively, one can include in `build.rs`:
 
 ```rust
 fn main() {

guide/src/getting-started.md

@@ -6,7 +6,7 @@ To get started using PyO3 you will need three things: a Rust toolchain, a Python
 
 ## Rust
 
-First, make sure you have Rust installed on your system. If you haven't already done so, try following the instructions [here](https://www.rust-lang.org/tools/install). PyO3 runs on both the `stable` and `nightly` versions so you can choose whichever one fits you best. The minimum required Rust version is 1.56.
+First, make sure you have Rust installed on your system. If you haven't already done so, try following the instructions [here](https://www.rust-lang.org/tools/install). PyO3 runs on both the `stable` and `nightly` versions so you can choose whichever one fits you best. The minimum required Rust version is 1.63.
 
 If you can run `rustc --version` and the version is new enough you're good to go!
 

newsfragments/4129.changed.md

@@ -0,0 +1 @@
+Raised the MSRV to 1.63

noxfile.py

@@ -557,22 +557,11 @@ def set_minimal_package_versions(session: nox.Session):
         "examples/word-count",
     )
     min_pkg_versions = {
-        "rust_decimal": "1.26.1",
-        "csv": "1.1.6",
-        "indexmap": "1.6.2",
-        "hashbrown": "0.9.1",
-        "log": "0.4.17",
-        "once_cell": "1.17.2",
-        "rayon": "1.6.1",
-        "rayon-core": "1.10.2",
-        "regex": "1.7.3",
-        "proptest": "1.0.0",
-        "chrono": "0.4.25",
-        "byteorder": "1.4.3",
-        "crossbeam-channel": "0.5.8",
-        "crossbeam-deque": "0.8.3",
-        "crossbeam-epoch": "0.9.15",
-        "crossbeam-utils": "0.8.16",
+        "regex": "1.9.6",
+        "proptest": "1.2.0",
+        "trybuild": "1.0.89",
+        "eyre": "0.6.8",
+        "allocator-api2": "0.2.10",
     }
 
     # run cargo update first to ensure that everything is at highest

pyo3-build-config/src/lib.rs

@@ -145,11 +145,6 @@ pub fn print_feature_cfgs() {
 
     let rustc_minor_version = rustc_minor_version().unwrap_or(0);
 
-    // Enable use of const initializer for thread_local! on Rust 1.59 and greater
-    if rustc_minor_version >= 59 {
-        println!("cargo:rustc-cfg=thread_local_const_init");
-    }
-
     // invalid_from_utf8 lint was added in Rust 1.74
     if rustc_minor_version >= 74 {
         println!("cargo:rustc-cfg=invalid_from_utf8_lint");

pyo3-ffi/README.md

@@ -14,7 +14,7 @@ Manual][capi] for up-to-date documentation.
 
 PyO3 supports the following software versions:
   - Python 3.7 and up (CPython and PyPy)
-  - Rust 1.56 and up
+  - Rust 1.63 and up
 
 # Example: Building Python Native modules
 

pyo3-ffi/build.rs

@@ -189,7 +189,7 @@ fn configure_pyo3() -> Result<()> {
         println!("{}", line);
     }
 
-    // Emit cfgs like `thread_local_const_init`
+    // Emit cfgs like `invalid_from_utf8_lint`
     print_feature_cfgs();
 
     Ok(())

pyo3-ffi/src/lib.rs

@@ -51,7 +51,7 @@
 //!
 //! PyO3 supports the following software versions:
 //!   - Python 3.7 and up (CPython and PyPy)
-//!   - Rust 1.56 and up
+//!   - Rust 1.63 and up
 //!
 //! # Example: Building Python Native modules
 //!

src/coroutine/cancel.rs

@@ -1,8 +1,7 @@
 use crate::{Py, PyAny, PyObject};
-use parking_lot::Mutex;
 use std::future::Future;
 use std::pin::Pin;
-use std::sync::Arc;
+use std::sync::{Arc, Mutex};
 use std::task::{Context, Poll, Waker};
 
 #[derive(Debug, Default)]
@@ -25,12 +24,12 @@ impl CancelHandle {
 
     /// Returns whether the associated coroutine has been cancelled.
     pub fn is_cancelled(&self) -> bool {
-        self.0.lock().exception.is_some()
+        self.0.lock().unwrap().exception.is_some()
     }
 
     /// Poll to retrieve the exception thrown in the associated coroutine.
     pub fn poll_cancelled(&mut self, cx: &mut Context<'_>) -> Poll<PyObject> {
-        let mut inner = self.0.lock();
+        let mut inner = self.0.lock().unwrap();
         if let Some(exc) = inner.exception.take() {
             return Poll::Ready(exc);
         }
@@ -69,7 +68,7 @@ pub struct ThrowCallback(Arc<Mutex<Inner>>);
 
 impl ThrowCallback {
     pub(super) fn throw(&self, exc: Py<PyAny>) {
-        let mut inner = self.0.lock();
+        let mut inner = self.0.lock().unwrap();
         inner.exception = Some(exc);
         if let Some(waker) = inner.waker.take() {
             waker.wake();

src/gil.rs

@@ -2,29 +2,16 @@
 
 use crate::impl_::not_send::{NotSend, NOT_SEND};
 use crate::{ffi, Python};
-use parking_lot::{const_mutex, Mutex, Once};
 use std::cell::Cell;
 #[cfg(debug_assertions)]
 use std::cell::RefCell;
 #[cfg(not(debug_assertions))]
 use std::cell::UnsafeCell;
-use std::{mem, ptr::NonNull};
+use std::{mem, ptr::NonNull, sync};
 
-static START: Once = Once::new();
+static START: sync::Once = sync::Once::new();
 
-cfg_if::cfg_if! {
-    if #[cfg(thread_local_const_init)] {
-        use std::thread_local as thread_local_const_init;
-    } else {
-        macro_rules! thread_local_const_init {
-            ($($(#[$attr:meta])* static $name:ident: $ty:ty = const { $init:expr };)*) => (
-                thread_local! { $($(#[$attr])* static $name: $ty = $init;)* }
-            )
-        }
-    }
-}
-
-thread_local_const_init! {
+std::thread_local! {
     /// This is an internal counter in pyo3 monitoring whether this thread has the GIL.
     ///
     /// It will be incremented whenever a GILGuard or GILPool is created, and decremented whenever
@@ -249,26 +236,26 @@ type PyObjVec = Vec<NonNull<ffi::PyObject>>;
 /// Thread-safe storage for objects which were inc_ref / dec_ref while the GIL was not held.
 struct ReferencePool {
     // .0 is INCREFs, .1 is DECREFs
-    pointer_ops: Mutex<(PyObjVec, PyObjVec)>,
+    pointer_ops: sync::Mutex<(PyObjVec, PyObjVec)>,
 }
 
 impl ReferencePool {
     const fn new() -> Self {
         Self {
-            pointer_ops: const_mutex((Vec::new(), Vec::new())),
+            pointer_ops: sync::Mutex::new((Vec::new(), Vec::new())),
         }
     }
 
     fn register_incref(&self, obj: NonNull<ffi::PyObject>) {
-        self.pointer_ops.lock().0.push(obj);
+        self.pointer_ops.lock().unwrap().0.push(obj);
     }
 
     fn register_decref(&self, obj: NonNull<ffi::PyObject>) {
-        self.pointer_ops.lock().1.push(obj);
+        self.pointer_ops.lock().unwrap().1.push(obj);
     }
 
     fn update_counts(&self, _py: Python<'_>) {
-        let mut ops = self.pointer_ops.lock();
+        let mut ops = self.pointer_ops.lock().unwrap();
         if ops.0.is_empty() && ops.1.is_empty() {
             return;
         }
@@ -523,9 +510,9 @@ mod tests {
     use super::{gil_is_acquired, GIL_COUNT, OWNED_OBJECTS, POOL};
     use crate::types::any::PyAnyMethods;
     use crate::{ffi, gil, PyObject, Python};
-    #[cfg(not(target_arch = "wasm32"))]
-    use parking_lot::{const_mutex, Condvar, Mutex};
     use std::ptr::NonNull;
+    #[cfg(not(target_arch = "wasm32"))]
+    use std::sync;
 
     fn get_object(py: Python<'_>) -> PyObject {
         py.eval_bound("object()", None, None).unwrap().unbind()
@@ -543,6 +530,7 @@ mod tests {
         !POOL
             .pointer_ops
             .lock()
+            .unwrap()
             .0
             .contains(&unsafe { NonNull::new_unchecked(obj.as_ptr()) })
     }
@@ -551,6 +539,7 @@ mod tests {
         !POOL
             .pointer_ops
             .lock()
+            .unwrap()
             .1
             .contains(&unsafe { NonNull::new_unchecked(obj.as_ptr()) })
     }
@@ -559,6 +548,7 @@ mod tests {
     fn pool_dec_refs_contains(obj: &PyObject) -> bool {
         POOL.pointer_ops
             .lock()
+            .unwrap()
             .1
             .contains(&unsafe { NonNull::new_unchecked(obj.as_ptr()) })
     }
@@ -671,8 +661,8 @@ mod tests {
         Python::with_gil(|py| {
             assert_eq!(obj.get_refcnt(py), 1);
             let non_null = unsafe { NonNull::new_unchecked(obj.as_ptr()) };
-            assert!(!POOL.pointer_ops.lock().0.contains(&non_null));
-            assert!(!POOL.pointer_ops.lock().1.contains(&non_null));
+            assert!(!POOL.pointer_ops.lock().unwrap().0.contains(&non_null));
+            assert!(!POOL.pointer_ops.lock().unwrap().1.contains(&non_null));
         });
     }
 
@@ -770,29 +760,30 @@ mod tests {
 
     #[cfg(not(target_arch = "wasm32"))]
     struct Event {
-        set: Mutex<bool>,
-        wait: Condvar,
+        set: sync::Mutex<bool>,
+        wait: sync::Condvar,
     }
 
     #[cfg(not(target_arch = "wasm32"))]
     impl Event {
         const fn new() -> Self {
             Self {
-                set: const_mutex(false),
-                wait: Condvar::new(),
+                set: sync::Mutex::new(false),
+                wait: sync::Condvar::new(),
             }
         }
 
         fn set(&self) {
-            *self.set.lock() = true;
+            *self.set.lock().unwrap() = true;
             self.wait.notify_all();
         }
 
         fn wait(&self) {
-            let mut set = self.set.lock();
-            while !*set {
-                self.wait.wait(&mut set);
-            }
+            drop(
+                self.wait
+                    .wait_while(self.set.lock().unwrap(), |s| !*s)
+                    .unwrap(),
+            );
         }
     }
 
@@ -891,16 +882,16 @@ mod tests {
 
             // The pointer should appear once in the incref pool, and once in the
             // decref pool (for the clone being created and also dropped)
-            assert!(POOL.pointer_ops.lock().0.contains(&ptr));
-            assert!(POOL.pointer_ops.lock().1.contains(&ptr));
+            assert!(POOL.pointer_ops.lock().unwrap().0.contains(&ptr));
+            assert!(POOL.pointer_ops.lock().unwrap().1.contains(&ptr));
 
             (obj, count, ptr)
         });
 
         Python::with_gil(|py| {
             // Acquiring the gil clears the pool
-            assert!(!POOL.pointer_ops.lock().0.contains(&ptr));
-            assert!(!POOL.pointer_ops.lock().1.contains(&ptr));
+            assert!(!POOL.pointer_ops.lock().unwrap().0.contains(&ptr));
+            assert!(!POOL.pointer_ops.lock().unwrap().1.contains(&ptr));
 
             // Overall count is still unchanged
             assert_eq!(count, obj.get_refcnt(py));

src/impl_/pymodule.rs

@@ -5,9 +5,17 @@ use std::{cell::UnsafeCell, marker::PhantomData};
 #[cfg(all(
     not(any(PyPy, GraalPy)),
     Py_3_9,
-    not(all(windows, Py_LIMITED_API, not(Py_3_10)))
+    not(all(windows, Py_LIMITED_API, not(Py_3_10))),
+    not(target_has_atomic = "64"),
 ))]
 use portable_atomic::{AtomicI64, Ordering};
+#[cfg(all(
+    not(any(PyPy, GraalPy)),
+    Py_3_9,
+    not(all(windows, Py_LIMITED_API, not(Py_3_10))),
+    target_has_atomic = "64",
+))]
+use std::sync::atomic::{AtomicI64, Ordering};
 
 #[cfg(not(any(PyPy, GraalPy)))]
 use crate::exceptions::PyImportError;