Clean up deprecations (#8300)

* vm: replace fetch_update() with try_update()

fetch_update() in atomic namespace is in the deprecation stage.

* host_env: replace libc::RLIM_NLIMITS with const RLIM_NLIMITS

Define a new const, RLIM_NLIMITS instead of libc::RLIM_NLIMITS in order
to clean up the deprecated const and to prevent breaking API where the const
is still used.

crates/host_env/src/resource.rs

@@ -7,9 +7,6 @@ pub use libc::{
     RLIMIT_NOFILE, RLIMIT_NPROC, RLIMIT_RSS, RLIMIT_STACK, c_long, rlim_t, rlimit, timeval,
 };
 
-#[cfg(target_os = "android")]
-pub use libc::RLIM_NLIMITS;
-
 #[cfg(any(target_os = "linux", target_os = "android", target_os = "emscripten"))]
 pub use libc::{RLIMIT_MSGQUEUE, RLIMIT_NICE, RLIMIT_RTPRIO, RLIMIT_SIGPENDING};
 
@@ -36,6 +33,9 @@ pub use libc::RUSAGE_THREAD;
 #[cfg(not(any(target_os = "windows", target_os = "redox")))]
 pub use libc::{RUSAGE_CHILDREN, RUSAGE_SELF};
 
+#[cfg(target_os = "android")]
+pub const RLIM_NLIMITS: libc::c_int = 16;
+
 #[derive(Debug, Clone, Copy)]
 pub struct RUsage {
     pub ru_utime: libc::timeval,

crates/vm/src/builtins/function.rs

@@ -87,7 +87,7 @@ static FUNC_VERSION_COUNTER: AtomicU32 = AtomicU32::new(1);
 /// Once the counter wraps to 0, it stays at 0 permanently.
 fn next_func_version() -> u32 {
     FUNC_VERSION_COUNTER
-        .fetch_update(Relaxed, Relaxed, |v| (v != 0).then(|| v.wrapping_add(1)))
+        .try_update(Relaxed, Relaxed, |v| (v != 0).then(|| v.wrapping_add(1)))
         .unwrap_or(0)
 }
 

crates/vm/src/builtins/type.rs

@@ -680,7 +680,7 @@ impl PyType {
         let flags_bits = flags.bits();
         let _ = self
             .abc_tpflags
-            .fetch_update(Ordering::AcqRel, Ordering::Acquire, |old| {
+            .try_update(Ordering::AcqRel, Ordering::Acquire, |old| {
                 Some((old & !collection_bits) | flags_bits)
             });
         self.modified();