From d8bbb424ab819640f48cb6cdc6279de9adb249a7 Mon Sep 17 00:00:00 2001
From: zetwhite <zetwhite@naver.com>
Date: Wed, 1 Sep 2021 19:57:37 +0900
Subject: [PATCH 1/2] Add os.sched_yield, os.sched_get_priority_min,
 os.sched_get_priority_max

---
 vm/src/stdlib/os.rs | 61 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/vm/src/stdlib/os.rs b/vm/src/stdlib/os.rs
index 79c90ebd0c..775abc06b1 100644
--- a/vm/src/stdlib/os.rs
+++ b/vm/src/stdlib/os.rs
@@ -2087,6 +2087,39 @@ mod posix {
     #[pyattr]
     const EX_CONFIG: i8 = exitcode::CONFIG as i8;
 
+    #[cfg(any(
+        target_os = "linux",
+        target_os = "android",
+        target_os = "freebsd",
+        target_os = "dragonfly",
+        target_os = "netbsd"
+    ))]
+    #[pyattr]
+    const SCHED_RR: i32 = libc::SCHED_RR;
+    #[cfg(any(
+        target_os = "linux",
+        target_os = "android",
+        target_os = "freebsd",
+        target_os = "dragonfly",
+        target_os = "netbsd"
+    ))]
+    #[pyattr]
+    const SCHED_FIFO: i32 = libc::SCHED_FIFO;
+    #[cfg(any(
+        target_os = "linux",
+        target_os = "freebsd",
+        target_os = "dragonfly",
+        target_os = "netbsd"
+    ))]
+    #[pyattr]
+    const SCHED_OTHER: i32 = libc::SCHED_OTHER;
+    #[cfg(any(target_os = "linux", target_os = "android"))]
+    #[pyattr]
+    const SCHED_IDLE: i32 = libc::SCHED_IDLE;
+    #[cfg(any(target_os = "linux", target_os = "android"))]
+    #[pyattr]
+    const SCHED_BATCH: i32 = libc::SCHED_BATCH;
+
     #[cfg(any(target_os = "linux", target_os = "freebsd", target_os = "macos"))]
     #[pyattr]
     const POSIX_SPAWN_OPEN: i32 = PosixSpawnFileActionIdentifier::Open as i32;
@@ -2369,6 +2402,34 @@ mod posix {
         }
     }
 
+    #[cfg(not(target_os = "redox"))]
+    #[pyfunction]
+    fn sched_get_priority_max(policy: i32, vm: &VirtualMachine) -> PyResult<i32> {
+        let max = unsafe { libc::sched_get_priority_max(policy) };
+        if max == -1 {
+            Err(errno_err(vm))
+        } else {
+            Ok(max)
+        }
+    }
+
+    #[cfg(not(target_os = "redox"))]
+    #[pyfunction]
+    fn sched_get_priority_min(policy: i32, vm: &VirtualMachine) -> PyResult<i32> {
+        let min = unsafe { libc::sched_get_priority_min(policy) };
+        if min == -1 {
+            Err(errno_err(vm))
+        } else {
+            Ok(min)
+        }
+    }
+
+    #[pyfunction]
+    fn sched_yield(vm: &VirtualMachine) -> PyResult<()> {
+        let _ = nix::sched::sched_yield().map_err(|e| e.into_pyexception(vm))?;
+        Ok(())
+    }
+
     #[pyfunction]
     fn get_inheritable(fd: RawFd, vm: &VirtualMachine) -> PyResult<bool> {
         use nix::fcntl::fcntl;

From 7359f9dda030f73921ab2acf088e51838df1e2ec Mon Sep 17 00:00:00 2001
From: Jeong YunWon <jeong@youknowone.org>
Date: Thu, 2 Sep 2021 20:20:11 +0900
Subject: [PATCH 2/2] skip test_sched_priority for now

---
 Lib/test/test_posix.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Lib/test/test_posix.py b/Lib/test/test_posix.py
index e379895c68..7a4d59e181 100644
--- a/Lib/test/test_posix.py
+++ b/Lib/test/test_posix.py
@@ -1306,6 +1306,7 @@ def test_sched_yield(self):
         posix.sched_yield()
 
     @requires_sched_h
+    @unittest.skip("TODO: RUSTPYTHON https://github.com/rust-lang/libc/pull/2384")
     @unittest.skipUnless(hasattr(posix, 'sched_get_priority_max'),
                          "requires sched_get_priority_max()")
     def test_sched_priority(self):