Queues using some macro magic

src/kernel/include/queue.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#define _QUEUE_DECL(queue, entry, type) \
+  struct queue{ \
+    type *first; \
+    type *last; \
+  }
+#define QUEUE_DECL(...) _QUEUE_DECL(__VA_ARGS__)
+#define _QUEUE_HEAD(queue, entry, type) \
+  struct queue queue
+#define QUEUE_HEAD(...) _QUEUE_HEAD(__VA_ARGS__)
+#define QUEUE_HEAD_EMPTY(...) _QUEUE_HEAD(__VA_ARGS__) = {0,0}
+
+#define _QUEUE_SPOT(queue, entry, type) \
+  type *entry
+#define QUEUE_SPOT(...) _QUEUE_SPOT(__VA_ARGS__)
+
+#define _QUEUE_EMPTY(queue, entry, type) \
+  (!(queue.last))
+#define QUEUE_EMPTY(...) _QUEUE_EMPTY(__VA_ARGS__)
+#define QUEUE_NOT_EMPTY(...) (!(_QUEUE_EMPTY(__VA_ARGS__)))
+
+#define _QUEUE_ADD(queue, entry, type, item) \
+  if(!queue.last) \
+    queue.first = item; \
+  else \
+    queue.last->entry = item; \
+  queue.last = item; \
+  item->entry = 0;
+#define QUEUE_ADD(...) _QUEUE_ADD(__VA_ARGS__)
+
+#define _QUEUE_DROP(queue, entry, type) \
+    if(!(queue.first = queue.first->entry)) \
+      queue.last = 0;
+#define QUEUE_DROP(...) _QUEUE_DROP(__VA_ARGS__)
+
+#define _QUEUE_PEEK(queue, entry, type) \
+    (queue.first)
+#define QUEUE_PEEK(...) _QUEUE_PEEK(__VA_ARGS__)

src/kernel/include/scheduler.h

@@ -1,4 +1,9 @@
 #pragma once
+#include <queue.h>
+
+#define READYQ readyQ, readyQ_next, struct thread
+QUEUE_DECL(READYQ);
+QUEUE_HEAD(READYQ);
 
 void ready(struct thread *th);
 struct thread *scheduler_next();

src/kernel/include/thread.h

@@ -1,13 +1,14 @@
 #pragma once
+#include <queue.h>
+#include <scheduler.h>
 #include <memory.h>
 
-
 struct thread
 {
   uintptr_t stack_ptr;
   uint64_t tid;
   uint64_t state;
-  struct thread *next;
+  QUEUE_SPOT(READYQ);
 };
 
 #define TCB_OFFSET (PAGE_SIZE - sizeof(struct thread))