1 files changed, 20 insertions, 0 deletions
diff --git a/newlib/libc/include/sys/lock.h b/newlib/libc/include/sys/lock.h
new file mode 100644
index 000000000..efdd7316f
--- /dev/null
+++ b/newlib/libc/include/sys/lock.h
@@ -0,0 +1,20 @@
+#ifndef __SYS_LOCK_H__
+#define __SYS_LOCK_H__
+
+/* dummy lock routines for single-threaded aps */
+
+typedef int _LOCK_T;
+typedef int _LOCK_RECURSIVE_T;
+
+#define __LOCK_INIT(class,lock) static int lock = 0;
+#define __LOCK_INIT_RECURSIVE(class,lock) static int lock = 0;
+#define __lock_init(lock) {}
+#define __lock_init_recursive(lock) {}
+#define __lock_close(lock) {}
+#define __lock_close_recursive(lock) {}
+#define __lock_acquire(lock) {}
+#define __lock_acquire_recursive(lock) {}
+#define __lock_release(lock) {}
+#define __lock_release_recursive(lock) {}
+
+#endif /* __SYS_LOCK_H__ */