linux - linux内核模块的读/写锁

Question

我正在努力保护我的 list对于使用读/写锁的数据，我在这个线程中找到了解决方案: What's the best linux kernel locking mechanism for a specific scenario

但我找不到此解决方案所需的 header ，似乎已过时，错误:

error: ‘RW_LOCK_UNLOCKED’ undeclared here (not in a function)

使用 <linux/spinlock.h>

Answer 1

RW_LOCK_UNLOCKED 已弃用很长时间，最终在 Linux 2.6.39 中删除，所以现在，according to the documentation :

For dynamic initialization, use spin_lock_init() or rwlock_init() as appropriate:

...

For static initialization, use DEFINE_SPINLOCK() / DEFINE_RWLOCK() or __SPIN_LOCK_UNLOCKED() / __RW_LOCK_UNLOCKED() as appropriate.

喜欢

static DEFINE_RWLOCK(myrwlock);

或

rwlock_t myrwlock;
static int __init rwlock_init(void)
{
    rwlock_init(&myrwlock);
}

代替

rwlock_t myrwlock = RW_LOCK_UNLOCKED;