本帖最后由 himol 于 2015-10-24 10:14 编辑
第七节:共享内存刷新模块
1. 功能描述
当接收到仓库发送上来的信息之后,此线程被激活,并把实时的环境信息刷新到共享内存中,让CGI与QT能查看最新消息
2. 数据描述
数据类型 | | |
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struct env_info_clien_addr | | |
3. 流程图
4. 代码
#include "sem.h"
#include "data_global.h"
#include "sqlite_link_list.h"
#define N 1024
extern pthread_mutex_t mutex_refresh;
extern pthread_mutex_t mutex_refresh_updata;
extern pthread_mutex_t mutex_global;
extern pthread_mutex_t mutex_slinklist;
extern pthread_cond_t cond_refresh;
extern pthread_cond_t cond_refresh_updata;
extern pthread_cond_t cond_sqlite;
extern char cgi_status;
extern char qt_status;
extern int shmid;
extern int semid;
extern struct env_info_clien_addr all_info_RT;
struct shm_addr
{
char cgi_status;
char qt_status;
struct env_info_clien_addr rt_status;
};
void *pthread_refresh (void *arg)
{
key_t key_info;
int shmid, semid;
struct shm_addr *shm_buf;
if ((key_info = ftok ("/app", 'i')) < 0)
{
perror ("ftok info");
exit (-1);
}
printf ("key = %dn", key_info);
if ((semid = semget (key_info, 1, IPC_CREAT | IPC_EXCL |0666)) < 0)
{
if (errno == EEXIST)
{
semid = semget (key_info, 1, 0666);
}
else
{
perror ("semget");
exit (-1);
}
}
else
{
init_sem (semid, 0, 1);
}
if ((shmid = shmget (key_info, N, IPC_CREAT | IPC_EXCL | 0666)) < 0)
{
if (errno == EEXIST)
{
shmid = shmget (key_info, N, 0666);
shm_buf = (struct shm_addr *)shmat (shmid, NULL, 0);
}
else
{
perror ("shmget");
exit (-1);
}
}
else
{
if ((shm_buf = (struct shm_addr *)shmat (shmid, NULL, 0)) == (void *)-1)
{
perror ("shmat");
exit (-1);
}
}
bzero (shm_buf, sizeof (struct shm_addr));
printf ("pthread_refresh is okn");
while (1)
{
pthread_mutex_lock (&mutex_refresh);
pthread_cond_wait (&cond_refresh, &mutex_refresh);
sem_p (semid, 0);
pthread_mutex_lock (&mutex_global);
shm_buf->rt_status = all_info_RT;
pthread_mutex_unlock (&mutex_global);
sem_v (semid, 0);
pthread_mutex_unlock (&mutex_refresh);
}
return 0;
}
/7 
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