/usr/include/newlib/sys/lock.h is in libnewlib-dev 2.4.0.20160527-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | #ifndef __SYS_LOCK_H__
#define __SYS_LOCK_H__
/* dummy lock routines for single-threaded aps */
typedef int _LOCK_T;
typedef int _LOCK_RECURSIVE_T;
#include <_ansi.h>
#define __LOCK_INIT(class,lock) static int lock = 0;
#define __LOCK_INIT_RECURSIVE(class,lock) static int lock = 0;
#define __lock_init(lock) (_CAST_VOID 0)
#define __lock_init_recursive(lock) (_CAST_VOID 0)
#define __lock_close(lock) (_CAST_VOID 0)
#define __lock_close_recursive(lock) (_CAST_VOID 0)
#define __lock_acquire(lock) (_CAST_VOID 0)
#define __lock_acquire_recursive(lock) (_CAST_VOID 0)
#define __lock_try_acquire(lock) (_CAST_VOID 0)
#define __lock_try_acquire_recursive(lock) (_CAST_VOID 0)
#define __lock_release(lock) (_CAST_VOID 0)
#define __lock_release_recursive(lock) (_CAST_VOID 0)
#endif /* __SYS_LOCK_H__ */
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