From ea1ad3c6b1bb30800820eb0cc512faf8c1804112 Mon Sep 17 00:00:00 2001
From: Aiken Harris <harraiken91@gmail.com>
Date: Wed, 17 Jun 2026 16:13:02 +0200
Subject: [PATCH] Implement deferred ready thread insertion

---
 xtoskrnl/CMakeLists.txt          |  1 +
 xtoskrnl/includes/ke.hh          |  1 +
 xtoskrnl/includes/ke/schedule.hh | 25 +++++++++++++++++++++
 xtoskrnl/ke/schedule.cc          | 37 ++++++++++++++++++++++++++++++++
 4 files changed, 64 insertions(+)
 create mode 100644 xtoskrnl/includes/ke/schedule.hh
 create mode 100644 xtoskrnl/ke/schedule.cc

diff --git a/xtoskrnl/CMakeLists.txt b/xtoskrnl/CMakeLists.txt
index b1b2080..8e3306c 100644
--- a/xtoskrnl/CMakeLists.txt
+++ b/xtoskrnl/CMakeLists.txt
@@ -55,6 +55,7 @@ list(APPEND XTOSKRNL_SOURCE
     ${XTOSKRNL_SOURCE_DIR}/ke/kthread.cc
     ${XTOSKRNL_SOURCE_DIR}/ke/kubsan.cc
     ${XTOSKRNL_SOURCE_DIR}/ke/runlevel.cc
+    ${XTOSKRNL_SOURCE_DIR}/ke/schedule.cc
     ${XTOSKRNL_SOURCE_DIR}/ke/semphore.cc
     ${XTOSKRNL_SOURCE_DIR}/ke/shdata.cc
     ${XTOSKRNL_SOURCE_DIR}/ke/spinlock.cc
diff --git a/xtoskrnl/includes/ke.hh b/xtoskrnl/includes/ke.hh
index 917817c..0051258 100644
--- a/xtoskrnl/includes/ke.hh
+++ b/xtoskrnl/includes/ke.hh
@@ -26,6 +26,7 @@
 #include <ke/kubsan.hh>
 #include <ke/proc.hh>
 #include <ke/runlevel.hh>
+#include <ke/schedule.hh>
 #include <ke/semphore.hh>
 #include <ke/shdata.hh>
 #include <ke/spinlock.hh>
diff --git a/xtoskrnl/includes/ke/schedule.hh b/xtoskrnl/includes/ke/schedule.hh
new file mode 100644
index 0000000..de05c1e
--- /dev/null
+++ b/xtoskrnl/includes/ke/schedule.hh
@@ -0,0 +1,25 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/includes/ke/schedule.hh
+ * DESCRIPTION:     XT Kernel Thread Scheduler
+ * DEVELOPERS:      Aiken Harris <harraiken91@gmail.com>
+ */
+
+#ifndef __XTOSKRNL_KE_SCHEDULE_HH
+#define __XTOSKRNL_KE_SCHEDULE_HH
+
+#include <xtos.hh>
+
+
+/* Kernel Library */
+namespace KE
+{
+    class Scheduler
+    {
+        public:
+            STATIC XTFASTCALL VOID InsertDeferredReadyList(IN PKTHREAD Thread);
+    };
+}
+
+#endif /* __XTOSKRNL_KE_SCHEDULE_HH */
diff --git a/xtoskrnl/ke/schedule.cc b/xtoskrnl/ke/schedule.cc
new file mode 100644
index 0000000..64deb6b
--- /dev/null
+++ b/xtoskrnl/ke/schedule.cc
@@ -0,0 +1,37 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/ke/schedule.cc
+ * DESCRIPTION:     XT Kernel Thread Scheduler
+ * DEVELOPERS:      Aiken Harris <harraiken91@gmail.com>
+ */
+
+#include <xtos.hh>
+
+
+/**
+ * Inserts a thread into the current processor's deferred ready list.
+ *
+ * @param Thread
+ *        Supplies a pointer to the thread being deferred.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTFASTCALL
+VOID
+KE::Scheduler::InsertDeferredReadyList(IN PKTHREAD Thread)
+{
+    PKPROCESSOR_CONTROL_BLOCK Prcb;
+
+    /* Retrieve the Processor Control Block (PRCB) for the executing core */
+    Prcb = KE::Processor::GetCurrentProcessorControlBlock();
+
+    /* Tag the thread with the current CPU and update its scheduling state */
+    Thread->DeferredProcessor = Prcb->CpuNumber;
+    Thread->State = DeferredReady;
+
+    /* Insert the thread into the deferred ready list */
+    RTL::LifoQueue::PushEntryList(&Prcb->DeferredReadyListHead, &Thread->SwapListEntry);
+}