Beta revert "Use OS thread name by default"

This reverts rust-lang#121666 due to rust-lang#123495

This has already been done on master but beta needs something that will backport cleanly.

library/std/src/sys/pal/hermit/thread.rs

@@ -2,7 +2,7 @@
 
 use super::abi;
 use super::thread_local_dtor::run_dtors;
-use crate::ffi::{CStr, CString};
+use crate::ffi::CStr;
 use crate::io;
 use crate::mem;
 use crate::num::NonZero;
@@ -71,10 +71,6 @@ impl Thread {
         // nope
     }
 
-    pub fn get_name() -> Option<CString> {
-        None
-    }
-
     #[inline]
     pub fn sleep(dur: Duration) {
         unsafe {

library/std/src/sys/pal/itron/thread.rs

@@ -8,7 +8,7 @@ use super::{
 };
 use crate::{
     cell::UnsafeCell,
-    ffi::{CStr, CString},
+    ffi::CStr,
     hint, io,
     mem::ManuallyDrop,
     num::NonZero,
@@ -204,10 +204,6 @@ impl Thread {
         // nope
     }
 
-    pub fn get_name() -> Option<CString> {
-        None
-    }
-
     pub fn sleep(dur: Duration) {
         for timeout in dur2reltims(dur) {
             expect_success(unsafe { abi::dly_tsk(timeout) }, &"dly_tsk");

library/std/src/sys/pal/sgx/thread.rs

@@ -1,6 +1,6 @@
 #![cfg_attr(test, allow(dead_code))] // why is this necessary?
 use super::unsupported;
-use crate::ffi::{CStr, CString};
+use crate::ffi::CStr;
 use crate::io;
 use crate::num::NonZero;
 use crate::time::Duration;
@@ -133,10 +133,6 @@ impl Thread {
         // which succeeds as-is with the SGX target.
     }
 
-    pub fn get_name() -> Option<CString> {
-        None
-    }
-
     pub fn sleep(dur: Duration) {
         usercalls::wait_timeout(0, dur, || true);
     }

library/std/src/sys/pal/teeos/thread.rs

@@ -1,7 +1,7 @@
 use core::convert::TryInto;
 
 use crate::cmp;
-use crate::ffi::{CStr, CString};
+use crate::ffi::CStr;
 use crate::io;
 use crate::mem;
 use crate::num::NonZero;
@@ -101,10 +101,6 @@ impl Thread {
         // contact the teeos rustzone team.
     }
 
-    pub fn get_name() -> Option<CString> {
-        None
-    }
-
     /// only main thread could wait for sometime in teeos
     pub fn sleep(dur: Duration) {
         let sleep_millis = dur.as_millis();

library/std/src/sys/pal/uefi/thread.rs

@@ -1,5 +1,5 @@
 use super::unsupported;
-use crate::ffi::{CStr, CString};
+use crate::ffi::CStr;
 use crate::io;
 use crate::num::NonZero;
 use crate::ptr::NonNull;
@@ -23,10 +23,6 @@ impl Thread {
         // nope
     }
 
-    pub fn get_name() -> Option<CString> {
-        None
-    }
-
     pub fn sleep(dur: Duration) {
         let boot_services: NonNull<r_efi::efi::BootServices> =
             crate::os::uefi::env::boot_services().expect("can't sleep").cast();

library/std/src/sys/pal/unix/thread.rs

@@ -1,5 +1,5 @@
 use crate::cmp;
-use crate::ffi::{CStr, CString};
+use crate::ffi::CStr;
 use crate::io;
 use crate::mem;
 use crate::num::NonZero;
@@ -225,44 +225,6 @@ impl Thread {
         // Newlib, Emscripten, and VxWorks have no way to set a thread name.
     }
 
-    #[cfg(target_os = "linux")]
-    pub fn get_name() -> Option<CString> {
-        const TASK_COMM_LEN: usize = 16;
-        let mut name = vec![0u8; TASK_COMM_LEN];
-        let res = unsafe {
-            libc::pthread_getname_np(libc::pthread_self(), name.as_mut_ptr().cast(), name.len())
-        };
-        if res != 0 {
-            return None;
-        }
-        name.truncate(name.iter().position(|&c| c == 0)?);
-        CString::new(name).ok()
-    }
-
-    #[cfg(any(target_os = "macos", target_os = "ios", target_os = "tvos", target_os = "watchos"))]
-    pub fn get_name() -> Option<CString> {
-        let mut name = vec![0u8; libc::MAXTHREADNAMESIZE];
-        let res = unsafe {
-            libc::pthread_getname_np(libc::pthread_self(), name.as_mut_ptr().cast(), name.len())
-        };
-        if res != 0 {
-            return None;
-        }
-        name.truncate(name.iter().position(|&c| c == 0)?);
-        CString::new(name).ok()
-    }
-
-    #[cfg(not(any(
-        target_os = "linux",
-        target_os = "macos",
-        target_os = "ios",
-        target_os = "tvos",
-        target_os = "watchos"
-    )))]
-    pub fn get_name() -> Option<CString> {
-        None
-    }
-
     #[cfg(not(target_os = "espidf"))]
     pub fn sleep(dur: Duration) {
         let mut secs = dur.as_secs();

library/std/src/sys/pal/unsupported/thread.rs

@@ -1,5 +1,5 @@
 use super::unsupported;
-use crate::ffi::{CStr, CString};
+use crate::ffi::CStr;
 use crate::io;
 use crate::num::NonZero;
 use crate::time::Duration;
@@ -22,10 +22,6 @@ impl Thread {
         // nope
     }
 
-    pub fn get_name() -> Option<CString> {
-        None
-    }
-
     pub fn sleep(_dur: Duration) {
         panic!("can't sleep");
     }

library/std/src/sys/pal/wasi/thread.rs

@@ -1,4 +1,4 @@
-use crate::ffi::{CStr, CString};
+use crate::ffi::CStr;
 use crate::io;
 use crate::mem;
 use crate::num::NonZero;
@@ -134,10 +134,6 @@ impl Thread {
         // nope
     }
 
-    pub fn get_name() -> Option<CString> {
-        None
-    }
-
     pub fn sleep(dur: Duration) {
         let nanos = dur.as_nanos();
         assert!(nanos <= u64::MAX as u128);

library/std/src/sys/pal/wasm/atomics/thread.rs

@@ -1,5 +1,4 @@
 use crate::ffi::CStr;
-use crate::ffi::CString;
 use crate::io;
 use crate::num::NonZero;
 use crate::sys::unsupported;
@@ -18,9 +17,6 @@ impl Thread {
     pub fn yield_now() {}
 
     pub fn set_name(_name: &CStr) {}
-    pub fn get_name() -> Option<CString> {
-        None
-    }
 
     pub fn sleep(dur: Duration) {
         use crate::arch::wasm32;

library/std/src/sys/pal/windows/thread.rs

@@ -9,7 +9,6 @@ use crate::sys::handle::Handle;
 use crate::sys::stack_overflow;
 use crate::sys_common::FromInner;
 use crate::time::Duration;
-use alloc::ffi::CString;
 use core::ffi::c_void;
 
 use super::time::WaitableTimer;
@@ -68,29 +67,6 @@ impl Thread {
         };
     }
 
-    pub fn get_name() -> Option<CString> {
-        unsafe {
-            let mut ptr = core::ptr::null_mut();
-            let result = c::GetThreadDescription(c::GetCurrentThread(), &mut ptr);
-            if result < 0 {
-                return None;
-            }
-            let name = String::from_utf16_lossy({
-                let mut len = 0;
-                while *ptr.add(len) != 0 {
-                    len += 1;
-                }
-                core::slice::from_raw_parts(ptr, len)
-            })
-            .into_bytes();
-            // Attempt to free the memory.
-            // This should never fail but if it does then there's not much we can do about it.
-            let result = c::LocalFree(ptr.cast::<c_void>());
-            debug_assert!(result.is_null());
-            if name.is_empty() { None } else { Some(CString::from_vec_unchecked(name)) }
-        }
-    }
-
     pub fn join(self) {
         let rc = unsafe { c::WaitForSingleObject(self.handle.as_raw_handle(), c::INFINITE) };
         if rc == c::WAIT_FAILED {

library/std/src/sys/pal/xous/thread.rs

@@ -1,4 +1,4 @@
-use crate::ffi::{CStr, CString};
+use crate::ffi::CStr;
 use crate::io;
 use crate::num::NonZero;
 use crate::os::xous::ffi::{
@@ -113,10 +113,6 @@ impl Thread {
         // nope
     }
 
-    pub fn get_name() -> Option<CString> {
-        None
-    }
-
     pub fn sleep(dur: Duration) {
         // Because the sleep server works on units of `usized milliseconds`, split
         // the messages up into these chunks. This means we may run into issues

library/std/src/sys_common/thread_info.rs

@@ -1,7 +1,6 @@
 #![allow(dead_code)] // stack_guard isn't used right now on all platforms
 
 use crate::cell::OnceCell;
-use crate::sys;
 use crate::sys::thread::guard::Guard;
 use crate::thread::Thread;
 
@@ -24,8 +23,7 @@ impl ThreadInfo {
     {
         THREAD_INFO
             .try_with(move |thread_info| {
-                let thread =
-                    thread_info.thread.get_or_init(|| Thread::new(sys::thread::Thread::get_name()));
+                let thread = thread_info.thread.get_or_init(|| Thread::new(None));
                 f(thread, &thread_info.stack_guard)
             })
             .ok()

library/std/src/thread/tests.rs

@@ -69,26 +69,6 @@ fn test_named_thread_truncation() {
     result.unwrap().join().unwrap();
 }
 
-#[cfg(any(
-    all(target_os = "windows", not(target_vendor = "win7")),
-    target_os = "linux",
-    target_os = "macos",
-    target_os = "ios",
-    target_os = "tvos",
-    target_os = "watchos"
-))]
-#[test]
-fn test_get_os_named_thread() {
-    use crate::sys::thread::Thread;
-    // Spawn a new thread to avoid interfering with other tests running on this thread.
-    let handler = thread::spawn(|| {
-        let name = c"test me please";
-        Thread::set_name(name);
-        assert_eq!(name, Thread::get_name().unwrap().as_c_str());
-    });
-    handler.join().unwrap();
-}
-
 #[test]
 #[should_panic]
 fn test_invalid_named_thread() {