Made a single set_name for linux and bsd

Author: YohDeadfall

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

@@ -129,22 +129,21 @@ impl Thread {
         }
     }
 
-    #[cfg(target_os = "linux")]
-    pub fn set_name(name: &CStr) {
-        const TASK_COMM_LEN: usize = 16;
-
-        unsafe {
-            // Available since glibc 2.12, musl 1.1.16, and uClibc 1.0.20.
-            let name = truncate_cstr::<{ TASK_COMM_LEN }>(name);
-            let res = libc::pthread_setname_np(libc::pthread_self(), name.as_ptr());
-            // We have no good way of propagating errors here, but in debug-builds let's check that this actually worked.
-            debug_assert_eq!(res, 0);
-        }
-    }
-
-    #[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
+    #[cfg(any(target_os = "linux", target_os = "freebsd", target_os = "dragonfly"))]
     pub fn set_name(name: &CStr) {
         unsafe {
+            let name = {
+                cfg_if::cfg_if! {
+                    if #[cfg(target_os = "linux")] {
+                        const TASK_COMM_LEN: usize = 16;
+                        &truncate_cstr::<{ TASK_COMM_LEN }>(name)
+                    } else {
+                        name.to_bytes()
+                    }
+                }
+            };
+            // Available since glibc 2.12, musl 1.1.16, and uClibc 1.0.20 for Linux,
+            // FreeBSD 12.2 and 13.0, and DragonFlyBSD 6.0.
             let res = libc::pthread_setname_np(libc::pthread_self(), name.as_ptr());
             // We have no good way of propagating errors here, but in debug-builds let's check that this actually worked.
             debug_assert_eq!(res, 0);