Linux Kernel API (2.6)

最新推荐文章于 2022-06-19 22:18:49 发布

原创最新推荐文章于 2022-06-19 22:18:49 发布 · 632 阅读

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#api #linux #function #up #go

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本文详细介绍了Linux内核中自旋锁和互斥锁的工作原理及使用场景。自旋锁主要用于保护进程上下文中的共享数据，并确保锁之间的代码足够快；而在中断上下文中则使用不同类型的自旋锁。互斥锁与自旋锁类似，但更高效，且支持中断。此外，文章还对比了自旋锁与互斥锁的不同之处。

For UP system

#protect share data
spin_lock/spin_unlock: protect the data during process context(and only at process context), and make sure your code bewteen lock/unlock is fast enough.There may deadlock if the same spin_lock is called at interrupt context.

spin_lock_irq/spin_unlock_irq: call it during interrupt context, make sure the irq is on before calling this function, it will disable irq before accessing share data

spin_lock_irqsave/irqrestore: use at interrupt context, and will save/restort irq registers

The code between spin_lock**/spin_unlock** must not sleep.

The spin_lock** API is defined at include/linux/spinlock_api_up.h for UP architecture.

linux/kernel/spinlock.c is only for SMP.

mutex_lock/mutex_unlock: the similar with down/up, but more efficient

mutex_lock_interruptible: the simlilar with down_interruptiable, can be interruptiable by signal.(like CTRL-C)

the code beween mutex_lock and mutex_unlock can go to sleep