From 9727f0bbfa437116aa9230b3ba83665fed471558 Mon Sep 17 00:00:00 2001
From: pjht <terppa05@gmail.com>
Date: Mon, 27 Jul 2020 18:01:24 -0500
Subject: [PATCH] Fix allowing unblocking of exited/ready/running threads

---
 kernel/tasking.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/tasking.c b/kernel/tasking.c
index 5c460c1..285dde1 100644
--- a/kernel/tasking.c
+++ b/kernel/tasking.c
@@ -300,6 +300,10 @@ void tasking_unblock(pid_t pid,pid_t tid) {
       serial_printf("Error! Got wrong thread! (Wanted TID %d, got TID %d)\n",tid,thread->tid);
       halt();
     }
+    if (thread->state==THREAD_EXITED||thread->state==THREAD_READY||thread->state==THREAD_RUNNING) {
+      serial_printf("Tried to unblock an exited/ready/running thread!\n");
+      return;
+    }
     thread->state=THREAD_READY;
     if (!is_proc_scheduled(thread->process->pid)) {
     // Link the thread onto the list of ready to run threads