int main()
{
int shmid=creatshm();
char* buf=(char*)atshm(shmid);
int i=0;
while(i<(SIZE-1))
{
buf[i]='A';
i++;
}
buf[SIZE-1]='\0';
dtshm(buf);
// destroyshm(shmid);
return 0;
}
void *second_level_recv()
{
int flag;
unsigned char real_time[256];
unsigned char second_data[6*1024];
struct plc_struct *p;
struct msg_remote sdata;
int semid,shmid;
int rc;
int count;
int fd;
int length;
char*shmaddr;
char*ret;
struct shm_local* shared;
printf(" second level recv pthread\n");
fd=tcp_connect();
read_plcfile();
length=sizeof(struct msg_remote)-sizeof(long);
if((shmid=creatshm(1))==-1)
exit(1);
if((shmaddr=shmat(shmid,(char*)0,0))==(char*)-1)
{
perror("attch shared memory error\n");
exit(1);
}
shared=(struct shm_local *)shmaddr;
shared->written=0;
if((semid=creatsem(1))==-1)
exit(1);
while(1)
{
flag=0;
switch(real_time_data)
{
case 0:
// printf("1\n");
length=tcp_receive(fd,second_data);
while(1)
{
// printf("1\n");
sem_p(semid);
if(shared->written==0)
{
memcpy(shared->data,second_data,length);
shared->length=length;
shared->written=1;
printf(" send shm data ok\n");
flag=1;
}
sem_v(semid);
if(flag==1)
{
sleep(second_rate);
break;
}
else
{
usleep(100000);
continue;
}
}
break;
case 1:
sdata.mtype=2;
length=tcp_receive(fd,second_data);
length=real_time_select(second_data,real_time);
sdata.length=length;
if(rc=msgsnd(remote_msgid,(void*)&sdata,sizeof(struct msg_remote)-sizeof(long),0)==-1)
exit(1);
printf(" send real time msg ok\n");
break;
}
}
exit(1);
}
