Implement Mutexes and supporting syscalls, cleanup/optimize scheduler

kernel/proc/mutex.h

@@ -0,0 +1,19 @@
+#ifndef _KERNEL_PROC_MUTEX_H
+#define _KERNEL_PROC_MUTEX_H
+
+#include <libk/std.h>
+#include <proc/suspension_q.h>
+#include <sync/spin_lock.h>
+
+struct proc;
+
+struct proc_mutex {
+  atomic_flag flag;
+  struct proc_suspension_q suspension_q;
+  struct proc* owner;
+};
+
+void proc_mutex_lock (struct proc* proc, struct proc_mutex* mutex);
+bool proc_mutex_unlock (struct proc* proc, struct proc_mutex* mutex);
+
+#endif // _KERNEL_PROC_MUTEX_H