bring back else code in set_thread_priority_and_policy

src/vxworks.rs

@@ -624,7 +624,29 @@ pub fn set_thread_priority_and_policy(
                     e => Err(Error::OS(e)),
                 }
             } else {
-                panic!("unsupported in vxworks");
+                // Normal priority threads must be set with static priority 0.
+                let params = ScheduleParams { sched_priority: 0 }.into_posix();
+
+                let ret = unsafe {
+                    libc::pthread_setschedparam(
+                        native,
+                        policy.to_posix(),
+                        &params as *const libc::sched_param,
+                    )
+                };
+
+                if ret != 0 {
+                    return Err(Error::OS(ret));
+                }
+
+                // Normal priority threads adjust relative priority through niceness.
+                set_errno(0);
+                let ret = unsafe { libc::setpriority(libc::PRIO_PROCESS, 0, fixed_priority) };
+                if ret != 0 {
+                    return Err(Error::OS(errno()));
+                }
+
+                Ok(())
             }
         }
     }
@@ -827,7 +849,7 @@ impl TryFrom<u8> for ThreadPriority {
 
 #[cfg(test)]
 mod tests {
-    use crate::unix::*;
+    use crate::vxworks::*;
 
     #[test]
     fn thread_schedule_policy_param_test() {