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interrupts/interrupts-9.md
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Interrupts and Interrupt Handling. Part 9. Interrupts and Interrupt Handling. Part 9.
================================================================================ ================================================================================
Introduction to deferred interrupts (Softirq, Tasklets and Workqueues) Introduction to deferred interrupts (Softirq, Tasklets and irqs)
-------------------------------------------------------------------------------- --------------------------------------------------------------------------------
It is the ninth part of the [linux-insides](https://www.gitbook.com/book/0xax/linux-insides/details) book and in the previous [Previous part](http://0xax.gitbooks.io/linux-insides/content/interrupts/interrupts-8.html) we saw implementation of the `init_IRQ` from that defined in the [arch/x86/kernel/irqinit.c](https://github.com/torvalds/linux/blob/master/arch/x86/kernel/irqinit.c) source code file. So, we will continue to dive into the initialization stuff which is related to the external hardware interrupts in this part. It is the ninth part of the [linux-insides](https://www.gitbook.com/book/0xax/linux-insides/details) book and in the previous [Previous part](http://0xax.gitbooks.io/linux-insides/content/interrupts/interrupts-8.html) we saw implementation of the `init_IRQ` from that defined in the [arch/x86/kernel/irqinit.c](https://github.com/torvalds/linux/blob/master/arch/x86/kernel/irqinit.c) source code file. So, we will continue to dive into the initialization stuff which is related to the external hardware interrupts in this part.
@ -258,7 +258,7 @@ struct tasklet_head {
}; };
``` ```
The `tasklet_struct` structure defined in the [include/linux/interrupt.h](https://github.com/torvalds/linux/blob/master/include/linux/interrupt.h) and represents the `Tasklet`. Previously we did not see this word in this book. Let's try to understand what is it `tasklet`. In short words, the tasklet is a thread that has no context and stack. Actually, the tasklet is an one of mechanisms to handle deferred interrupt. Let's look on the implementation if the `tasklet_struct` structure: The `tasklet_struct` structure defined in the [include/linux/interrupt.h](https://github.com/torvalds/linux/blob/master/include/linux/interrupt.h) and represents the `Tasklet`. Previously we did not see this word in this book. Let's try to understand what is it `tasklet`. Actually, the tasklet is an one of mechanisms to handle deferred interrupt. Let's look on the implementation if the `tasklet_struct` structure:
```C ```C
struct tasklet_struct struct tasklet_struct