/usr/arm-linux-androideabi/include/asm/spinlock.h is in gcc-arm-linux-androideabi 0.20130705.1-0ubuntu9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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***
*** This header was automatically generated from a Linux kernel header
*** of the same name, to make information necessary for userspace to
*** call into the kernel available to libc. It contains only constants,
*** structures, and macros generated from the original header, and thus,
*** contains no copyrightable information.
***
*** To edit the content of this header, modify the corresponding
*** source file (e.g. under external/kernel-headers/original/) then
*** run bionic/libc/kernel/tools/update_all.py
***
*** Any manual change here will be lost the next time this script will
*** be run. You've been warned!
***
****************************************************************************
****************************************************************************/
#ifndef __ASM_SPINLOCK_H
#define __ASM_SPINLOCK_H
#if __LINUX_ARM_ARCH__ < 6
#error SMP not supported on pre-ARMv6 CPUs
/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
#endif
#define __raw_spin_is_locked(x) ((x)->lock != 0)
#define __raw_spin_unlock_wait(lock) do { while (__raw_spin_is_locked(lock)) cpu_relax(); } while (0)
#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
#define rwlock_is_locked(x) (*((volatile unsigned int *)(x)) != 0)
#define __raw_write_can_lock(x) ((x)->lock == 0x80000000)
#define __raw_read_can_lock(x) ((x)->lock < 0x80000000)
#endif
/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
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