linux posix 通過pthread_join擷取線程pthread_exit傳回的資料

#include <stdio.h>
#include <pthread.h>

typedef struct _foo
{
	int a,b,c;
}foo;

void printfoo(foo* fp)
{
	if(fp)
		printf("a:%d\nb:%d\nc:%d\n",fp->a,fp->b,fp->c);
	else
		printf("ptr is Null\n");
}

void* proc1(void* arg)
{
	foo* p = (foo*)malloc(sizeof(foo));
	p->a = 4;
	p->b = 5;
	p->c = 6;
	pthread_exit((void*)p);
}

void* proc2(void* arg)
{
	foo* p = (foo*)malloc(sizeof(foo));
	p->a = 7;
	p->b = 8;
	p->c = 9;
	pthread_exit(0);
}

int main()
{
	foo f={1,2,3};
	foo* pf=&f;
	pthread_t pid1,pid2;
	pthread_create(&pid1,NULL,proc1,NULL);
	pthread_create(&pid2,NULL,proc2,NULL);
	printfoo(pf);
	pthread_join(pid1,(void*)&pf);
	printfoo(pf);
	pthread_join(pid2,(void*)&pf);
	printfoo(pf);

	return 0;
}