From e0b8afceb1f40e5400f2c105b76e8eed373f7687 Mon Sep 17 00:00:00 2001
From: jewelcodes <omarmelghoul01@gmail.com>
Date: Tue, 19 Nov 2024 21:22:08 -0500
Subject: [PATCH] sched: check thread exit status when signals are raised

---
 src/sched/sched.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/sched/sched.c b/src/sched/sched.c
index 2d5309ac..20257183 100644
--- a/src/sched/sched.c
+++ b/src/sched/sched.c
@@ -355,11 +355,15 @@ void schedule() {
                     current->status = THREAD_QUEUED;
 
                 signalHandle(t);
-                t->status = THREAD_RUNNING;
-                t->time = schedTimeslice(t, t->priority);
-                t->cpu = cpu;
-                releaseLock(&lock);
-                platformSwitchContext(t);
+
+                if(t->status == THREAD_QUEUED) {
+                    // check status again because the signal handler may terminate a thread
+                    t->status = THREAD_RUNNING;
+                    t->time = schedTimeslice(t, t->priority);
+                    t->cpu = cpu;
+                    releaseLock(&lock);
+                    platformSwitchContext(t);
+                }
             }
 
             t = t->next;