Rollup merge of rust-lang#112525 - hermitcore:devel, r=m-ou-se

Adjustments for RustyHermit

The interface between `libstd` and the OS changed and some changes are not correctly merged for RustHermit. For instance, the crate `hermit_abi` isn't defined as public, although it provided the socket interface for the application.

In addition, the support of thread::available_parallelism is realized. It returns the number of available processors.

Author: matthiaskrgr

std/Cargo.toml

@@ -45,7 +45,7 @@ dlmalloc = { version = "0.2.3", features = ['rustc-dep-of-std'] }
 fortanix-sgx-abi = { version = "0.5.0", features = ['rustc-dep-of-std'], public = true }
 
 [target.'cfg(target_os = "hermit")'.dependencies]
-hermit-abi = { version = "0.3.0", features = ['rustc-dep-of-std'] }
+hermit-abi = { version = "0.3.2", features = ['rustc-dep-of-std'], public = true }
 
 [target.wasm32-wasi.dependencies]
 wasi = { version = "0.11.0", features = ['rustc-dep-of-std'], default-features = false }

std/src/sys/hermit/thread.rs

@@ -1,6 +1,5 @@
 #![allow(dead_code)]
 
-use super::unsupported;
 use crate::ffi::CStr;
 use crate::io;
 use crate::mem;
@@ -99,7 +98,7 @@ impl Thread {
 }
 
 pub fn available_parallelism() -> io::Result<NonZeroUsize> {
-    unsupported()
+    unsafe { Ok(NonZeroUsize::new_unchecked(abi::get_processor_count())) }
 }
 
 pub mod guard {

std/src/sys/hermit/time.rs

@@ -40,7 +40,7 @@ impl Timespec {
     }
 
     fn checked_add_duration(&self, other: &Duration) -> Option<Timespec> {
-        let mut secs = self.tv_sec.checked_add_unsigned(other.as_secs())?;
+        let mut secs = self.t.tv_sec.checked_add_unsigned(other.as_secs())?;
 
         // Nano calculations can't overflow because nanos are <1B which fit
         // in a u32.
@@ -53,7 +53,7 @@ impl Timespec {
     }
 
     fn checked_sub_duration(&self, other: &Duration) -> Option<Timespec> {
-        let mut secs = self.tv_sec.checked_sub_unsigned(other.as_secs())?;
+        let mut secs = self.t.tv_sec.checked_sub_unsigned(other.as_secs())?;
 
         // Similar to above, nanos can't overflow.
         let mut nsec = self.t.tv_nsec as i32 - other.subsec_nanos() as i32;