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diff --git a/src/threads/synchlist.h b/src/threads/synchlist.h
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+// synchlist.h 
+//	Data structures for synchronized access to a list.
+//
+//	Implemented by surrounding the List abstraction
+//	with synchronization routines.
+//
+// Copyright (c) 1992-1993 The Regents of the University of California.
+// All rights reserved.  See copyright.h for copyright notice and limitation 
+// of liability and disclaimer of warranty provisions.
+//
+// modified by Vlad Jahundovics for Pintos (translation from C++ to C)
+
+
+#include "copyright.h"
+#include <list.h>
+#include "threads/synch.h"
+
+// The following class defines a "synchronized list" -- a list for which:
+// these constraints hold:
+//	1. Threads trying to remove an item from a list will
+//	wait until the list has an element on it.
+//	2. One thread at a time can access list data structures
+
+struct SynchList {
+  struct list sl_list;
+  struct lock sl_lock;
+  struct condition sl_empty;
+};
+
+struct SL_element
+{
+  struct list_elem elem;
+  void *item;
+};
+
+void sl_init(struct SynchList *sl);
+void sl_destroy(struct SynchList *sl);
+void sl_append(struct SynchList *sl, void *item);
+void *sl_remove(struct SynchList *sl);