#include <sys/syscall.h>
#include <stdio.h>

void fun()
{
    static int ls_pid1 = 0;  // 初始化为0
    int pid1 = syscall(SYS_gettid);
    ls_pid1 = pid1;
    printf("%d\n", ls_pid1);
}

int main()
{
    int pid = syscall(SYS_gettid);
    static int ls_pid = 1;  // 初始化非0
    ls_pid = pid;
    printf("%d\n", ls_pid);
    fun();
    return 0;
}