Pei Hsuan Hung afcidk

afcidk / Makefile

Last active May 10, 2025 15:13

A simple kernel module to show why mutex locks matters.

	CONFIG_MODULE_SIG = n
	TARGET_MODULE := test_mutex

	obj-m := $(TARGET_MODULE).o
	ccflags-y := -std=gnu99 -Wno-declaration-after-statement

	KDIR := /lib/modules/$(shell uname -r)/build
	PWD := $(shell pwd)

	all: client

afcidk / Makefile

Last active March 14, 2019 06:17

Simple kernel module to test speed of fp and int operation

	PWD := $(shell pwd)
	KDIR = /usr/src/linux-headers-$(shell uname -r)/

	MODULE_NAME = floating
	obj-m := $(MODULE_NAME).o
	ccflags-y := -std=gnu99 -Wno-declaration-after-statement -mhard-float

	all: clean integer_ver float_ver
	gnuplot plot.gp

afcidk / extension_alias.c

Created March 12, 2019 15:45

Sample code of gnu c extension alias

	// Reference: https://gcc.gnu.org/onlinedocs/gcc-4.7.2/gcc/Function-Attributes.html

	#include <stdio.h>

	extern void func(void);

	void print_hi(void) {
	printf("hello~\n");
	}

afcidk / Makefile

Created February 25, 2019 14:30

Simple code for checking the speed difference between function call and macro

	CC = gcc
	SIZE = 100000

	all: macro function

	macro: base.c
	$(CC) -o macro base.c -DMACRO -g -DNAME=\"macro.log\"

	function: base.c
	$(CC) -o function base.c -g -DNAME=\"func.log\"

afcidk / gist2.c

Created October 16, 2016 10:00

afcidk / gist1.c

Created October 16, 2016 09:52

	#include<stdio.h>

	void wrong_change(int);
	void correct_change(int*);


	int main() {
	int number = 5;
	printf("the number now is : %d\n",number);