Rollup merge of rust-lang#148694 - joboet:teeos-sync, r=ChrisDenton

std: support `RwLock` and thread parking on TEEOS

Since TEEOS supports pthread mutexes and condvars, it can share the pthread-based thread parking implementation and thus also the queue-based `RwLock` implementation used on other platforms.

CC ``@petrochenkov`` ``@Sword-Destiny``

Author: Zalathar

std/src/sys/sync/rwlock/mod.rs

@@ -19,6 +19,7 @@ cfg_select! {
         all(target_os = "windows", target_vendor = "win7"),
         all(target_vendor = "fortanix", target_env = "sgx"),
         target_os = "xous",
+        target_os = "teeos",
     ) => {
         mod queue;
         pub use queue::RwLock;
@@ -27,10 +28,6 @@ cfg_select! {
         mod solid;
         pub use solid::RwLock;
     }
-    target_os = "teeos" => {
-        mod teeos;
-        pub use teeos::RwLock;
-    }
     _ => {
         mod no_threads;
         pub use no_threads::RwLock;

std/src/sys/sync/rwlock/teeos.rs

@@ -35,7 +35,10 @@ cfg_select! {
         mod xous;
         pub use xous::Parker;
     }
-    target_family = "unix" => {
+    any(
+        target_family = "unix",
+        target_os = "teeos",
+    ) => {
         mod pthread;
         pub use pthread::Parker;
     }