From d5316d82759bfbe146e014597605f121cb3c2e45 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Thu, 10 Jul 2025 21:29:14 -0400
Subject: kernel/sched: Undo sched_yield() changes

- Keep old sched_yield() logic as newer logic caused issues on QEMU
- TODO: Actually fix and test

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/kern/kern_sched.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/sys/kern/kern_sched.c b/sys/kern/kern_sched.c
index 30036c0..774ba71 100644
--- a/sys/kern/kern_sched.c
+++ b/sys/kern/kern_sched.c
@@ -258,8 +258,27 @@ sched_enter(void)
 void
 sched_yield(void)
 {
+    struct proc *td;
+    struct cpu_info *ci = this_cpu();
+
+    if ((td = ci->curtd) == NULL) {
+        return;
+    }
+
+    td->rested = true;
+
+    /* FIXME: Hang yielding when waited on */
+    if (ISSET(td->flags, PROC_WAITED)) {
+        return;
+    }
+
+    ci->curtd = NULL;
     md_inton();
     sched_oneshot(false);
+
+    md_hlt();
+    md_intoff();
+    ci->curtd = td;
 }
 
 void
-- 
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