Auto merge of #2175 - devnexen:haiku_upd, r=JohnTitor

Add kernel scheduler API to Haiku

Author: bors

libc-test/build.rs

@@ -3205,6 +3205,7 @@ fn test_haiku(target: &str) {
                "kernel/fs_query.h",
                "kernel/fs_volume.h",
                "kernel/image.h",
+               "kernel/scheduler.h",
                "storage/StorageDefs.h",
                "support/Errors.h",
                "support/SupportDefs.h",

src/unix/haiku/native.rs

@@ -61,6 +61,12 @@ e! {
         B_ADD_ON_IMAGE,
         B_SYSTEM_IMAGE
     }
+
+    // kernel/scheduler.h
+    pub enum schduler_mode {
+        SCHEDULER_MODE_LOW_LATENCY,
+        SCHEDULER_MODE_POWER_SAVING,
+    }
 }
 
 s! {
@@ -744,6 +750,9 @@ extern "C" {
 
     pub fn find_thread(name: *const ::c_char) -> thread_id;
 
+    pub fn get_scheduler_mode() -> i32;
+    pub fn set_scheduler_mode(mode: i32) -> status_t;
+
     pub fn send_data(
         thread: thread_id,
         code: i32,