#include <stdio.h>
 
struct component_provider {
    int component_id;
    const char *component_name;
};

static const struct component_provider components[] = {
    {
        .component_id = 1,
        .component_name = "NAME-1",
    },
    {
        .component_id = 2,
        .component_name = "NAME-2",
    },
    {
        .component_id = 3,
        .component_name = "NAME-3",
    },
    {
        .component_id = 4,
        .component_name = "NAME-4",
    },
};
 
int main(){
	int i = 0;
	int max_providers = 0;
	const struct component_provider *providers = NULL;
	
	max_providers = sizeof(components) / sizeof(struct component_provider);
	providers = components;
		
	for (i = 0; i < max_providers; i++) {
	   printf("%s\n", providers[i].component_name);
	}
 	return 0;
}
 

#include <stdio.h>
 
struct component_obj{
    void (*start_thread)(void);
    void (*stop_thread)(void);
};


static void component_register(struct component_obj **current_obj, struct component_obj *obj)
{
    *current_obj = obj;
}

//component 1
void start_sub_thread1(void){
	printf("start thread 1\n");
}

struct component_obj obj1 = {
    .start_thread = start_sub_thread1,   
};

//component 2
void start_sub_thread2(void)
{
	printf("start thread 2\n");
}

struct component_obj obj2= {
    .start_thread = start_sub_thread2,   
};


int main(){
	
	struct component_obj *current_obj = NULL;
	
	component_register(&current_obj, &obj1);
	
	current_obj->start_thread();
	
 	return 0;
}
 

#include <stdio.h>
 
struct component_obj{
    void (*start_thread)(void);
    void (*stop_thread)(void);
};

typedef int (*func_callback)(int c);

func_callback fc=NULL;

static void component_register(struct component_obj **current_obj, struct component_obj *obj)
{
    *current_obj = obj;
}

//component 1
void start_sub_thread1(void){
	printf("start thread 1\n");
	if(!fc(1)){
		printf("start thread 1 sucessfully\n");
	}else {
		printf("start thread 1 failed! Go to rollback\n");
	};
}

struct component_obj obj1 = {
    .start_thread = start_sub_thread1,   
};


int main(){
	struct component_obj *current_obj = NULL;		
	component_register(&current_obj, &obj1);
		
	int check(int num) {
		printf("callback, num = %d\n", num);
		if(num < 10){
			printf("check OK\n");
		} else {
			printf("check err\n");
			return -1;
		}
		return 0;
	}
	fc=check;

	current_obj->start_thread();
	
 	return 0;
}