kernel: add a basic thread scheduler

Add a basic thread scheduler. This should allow the kernel to schedule
threads according to the round robin algorithm.

Signed-off-by: Danny Holman <dholman@gymli.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/include/kernel/sched.h b/include/kernel/sched.h
new file mode 100644
index 0000000..fef36b8
--- /dev/null
+++ b/include/kernel/sched.h
@@ -0,0 +1,27 @@
+#ifndef KERNEL_SCHED_H
+#define KERNEL_SCHED_H
+
+#include <kernel/asm.h>
+#include <kernel/data/list.h>
+
+#define THREAD_READY    0
+#define THREAD_RUNNING  1
+#define THREAD_WAIT     2
+
+struct task_block {
+        unsigned int pid;
+        unsigned int parent_pid;
+        int nice;
+        unsigned int num_threads;
+        struct thread_block *threads;
+        struct list_head list;
+};
+
+void sched_init(void);
+void schedule_next(void);
+
+struct task_block* init_task(int nice, unsigned int ppid);
+void schedule_thread(struct thread_block *thread);
+void switch_thread(struct thread_block *old, struct thread_block *new);
+
+#endif