1 files changed, 9 insertions, 2 deletions
diff --git a/sys/syscall_pcb.c b/sys/syscall_pcb.c
index b77be95..a37e4bb 100644
--- a/sys/syscall_pcb.c
+++ b/sys/syscall_pcb.c
@@ -1,14 +1,21 @@
 #include "api/error.h"
+#include "jove.h"
 #include "lib/printf.h"
+#include "proc/process.h"
+#include "proc/scheduler.h"
 #include "syscall.h"
+#include "errno.h"
 
 int
 s_syscall_pcb_yield(jove_owned_obj_t *pcb_obj,
         size_t bytes_left,
         void *payload_data)
 {
-    kprintf("%s: Stub!\n", __func__);
-    return 0;
+    size_t bytes_needed = sizeof(pid_t);
+    CHECK_TOOSMALL(bytes_needed, bytes_left, "Message too small for payload");
+
+    pid_t subject_pid = *((pid_t*)payload_data);
+    return scheduler_yield(subject_pid);
 }
 
 int