kernel: sched: Implement better sched_yield()

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 12 insertions, 4 deletions

diff --git a/sys/kern/kern_sched.c b/sys/kern/kern_sched.c
index b66bdf8..8e456d2 100644
--- a/sys/kern/kern_sched.c
+++ b/sys/kern/kern_sched.c
@@ -253,12 +253,20 @@ sched_enter(void)
 void
 sched_yield(void)
 {
-    struct proc *td = this_td();
+    struct proc *td;
+    struct cpu_info *ci = this_cpu();
 
-    if (td != NULL) {
-        td->rested = true;
-        sched_switch(&td->tf);
+    if ((td = ci->curtd) == NULL) {
+        return;
     }
+
+    td->rested = true;
+    ci->curtd = NULL;
+
+    md_inton();
+    sched_oneshot(false);
+    md_hlt();
+    ci->curtd = td;
 }
 
 void