clone.c

来自「基于linux的系统编程程序」· C语言 代码 · 共 32 行

/*#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sched.h>*/
#include "stdio.h"
#include "sched.h"
#include "signal.h"
#define FIBER_STACK 8192
int a;
void * stack;
int do_something(){
        printf("This is son, the pid is:%d, the a is: %d\n", getpid(), ++a);
        free(stack); //这里我也不清楚，如果这里不释放，不知道子线程死亡后，该内存是否会释放，知情者可以告诉下,谢谢
        exit(1);
}
int main() {
        void * stack;
        a = 1;
        stack = malloc(FIBER_STACK);//为子进程申请系统堆栈
        if(!stack) {
                printf("The stack failed\n");
                exit(0);
        }

        printf("creating son thread!!!\n");

        __clone(&do_something, (char *)stack + FIBER_STACK, CLONE_VM|CLONE_VFORK, 0);//创建子线程
         printf("This is father, my pid is: %d, the a is: %d\n", getpid(), a);
         exit(1);
}