Linux Kernel Programming Part 2 - Char Device Drivers and Kernel Synchronization by Kaiwan N Billimoria

Author:Kaiwan N Billimoria [Kaiwan N Billimoria]
Language: eng
Format: epub
Tags: COM088010 - COMPUTERS / System Administration / Linux and UNIX Administration, COM043040 - COMPUTERS / Networking / Network Protocols, COM019000 - COMPUTERS / System Administration / Disaster and Recovery
Publisher: Packt Publishing
Published: 2021-03-19T06:08:48+00:00

Initializing the tasklet

The tasklet_init() function initializes a tasklet; its signature is as follows:

#include <linux/interrupt.h>

void tasklet_init(struct tasklet_struct *t, void (*func)(unsigned long), unsigned long data);

Let's check out its parameters:

struct tasklet_struct *t: This structure is the metadata representing the tasklet. As you already know, a pointer, by itself, has no memory! Remember to allocate memory to the data structure and then pass the pointer here.

void (*func)(unsigned long): This is the tasklet function itself – the "bottom half" that runs once the hardirq completes; this bottom half function performs the majority of the interrupt handling process.

unsigned long data: Any data item you wish to pass along to the tasklet routine (a cookie).

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