//取可用部门共享内存大小
int get_adv_memlen()
{
int *plen = NULL;
int len = 0;
//加锁
if (semlock() < 0)
return -1;
if (!g_pBusiShareMem && GetShm2((void**)&g_pBusiShareMem, DEP_SHM_ID, MAX_DEP_SHMEM_LEN , 0666) < 0)
{
semunlock();
return -1;
}
//取已用长度
plen = (int*)g_pBusiShareMem;
if (plen == NULL)
{
semunlock();
return -1;
}
if (*plen < 0 || *plen > (int)MAX_DEP_VALUE_LEN)
{
semunlock();
return -1;
}
len = *plen;
semunlock();
return MAX_DEP_VALUE_LEN - len;
}
//设置业务部门的数据到共享内存
int adv_attr_set(int attr_id , size_t len , char* pvalue)
{
char *p = NULL;
int *plen = NULL;
if (attr_id < DEP_ATTTIBUTE_BASE ||
len == 0 ||
pvalue == NULL)
return -1;
//加锁
if (semlock() < 0)
return -1;
if (!g_pBusiShareMem && GetShm2((void**)&g_pBusiShareMem, DEP_SHM_ID, MAX_DEP_SHMEM_LEN , 0666) < 0)
{
semunlock();
return -1;// 修正无法获取共享内存问题,modified by arrowliu, 2006-03-29
}
//取可用长度
plen = (int*)g_pBusiShareMem;
if (plen == NULL)
{
semunlock();
return -1;
}
if (*plen > MAX_DEP_VALUE_LEN || (MAX_DEP_VALUE_LEN - *plen) < len + 8) // modified by arrowliu, 2006-08-10
{
semunlock();
return -1;
}
//copy value
p = g_pBusiShareMem;
p += sizeof(int);//all the data length
p += *plen;
*plen += len + 2*sizeof(int);//increase length,一个整形是长度，一个是id
//first 4byte is length of data
*(int*)p = htonl(len);
//second 4byte is attribute id of data
p += sizeof(int);
*(int*)p = htonl(attr_id);
//other buffer for the data
p += sizeof(int);
memcpy(p , pvalue , len);
semunlock();
return 0;
}
static void sigHandler(int signo)
{
if(signo == common_sig_t[0]) // start
{
if( semVal(pkg->sem_id , 0) > 0 )
{
semlock(pkg->sem_id , 0);
}
}
else if(signo == common_sig_t[1]) // stop
{
if( semVal(pkg->sem_id , 0) == 0)
{
semunlock(pkg->sem_id , 0);
}
}
else if(signo == common_sig_t[2]) // koniec
{
semlock(pkg->sem_id, 4); // ustawienie flagi sygnalu do zabicia procesu nr 2
if( semVal(pkg->sem_id , 0) > 0 ) // jesli dostaniemy podczas waita
{
semlock(pkg->sem_id , 0);
}
}
}
static void * mainLoop(void * write_pipe_fd )
{
char * shm = pkg->shm_ptr;
int * fd = (int *)write_pipe_fd;
killfd = *fd;
unsigned char readed_bytes;
while(1)
{
semlock(pkg->sem_id, 2);
if( !semVal(pkg->sem_id , 4) )
{
kill(pid_p3,communication_sig_t[2]); // poinformowanie procesu 3
if( semVal(pkg->sem_id, 3) ) // ustawienie flagi sygnalu do zabicia procesu nr 1
{
semlock(pkg->sem_id, 3);
}
if( semVal(pkg->sem_id , 0) > 0 )
{
semlock(pkg->sem_id , 0); // jbc odblokowanie jesli dostalismy kill podczas stopu
}
semunlock(pkg->sem_id, 1); // wpuszczenie proc 1 do sprawdzenia flagi i zabicia sie
write(killfd, &killfd , sizeof(char) ); // odblokowanie procesu nr 3 aby sie zabil
break;
/*pthread_cancel(thread);
pthread_testcancel(); */
}
readed_bytes = (unsigned char)shm[0];
write(*fd, &shm[1] ,readed_bytes);
semunlock(pkg->sem_id , 1);
}
pthread_exit(EXIT_SUCCESS);
}
int free_adv_mem()
{
int *plen = NULL;
// int len = 0;
//加锁
if (semlock() < 0)
return -1;
if (!g_pBusiShareMem && GetShm2((void**)&g_pBusiShareMem, DEP_SHM_ID, MAX_DEP_SHMEM_LEN , 0666) < 0)
{
semunlock();
return -1;
}
//取已用长度
plen = (int*)g_pBusiShareMem;
if (plen == NULL)
{
semunlock();
return -1;
}
if (*plen < 0 || *plen > (int)MAX_DEP_VALUE_LEN)
{
semunlock();
return -1;
}
memset(g_pBusiShareMem + sizeof(int) , 0 , *plen);
*plen = 0;
semunlock();
return 0;
}
//取部门共享内存的内容,注意pOut调用者分配，且大小一定要等于或大于len
int get_adv_mem(size_t offset , size_t len , char* pOut)
{
int actual_size = len;
int *plen = NULL;
if (offset >= MAX_DEP_VALUE_LEN ||
len < 1 ||
pOut == NULL)
return -1;
memset(pOut , 0 , len);
//加锁
if (semlock() < 0)
return -1;
if (!g_pBusiShareMem && GetShm2((void**)&g_pBusiShareMem, DEP_SHM_ID, MAX_DEP_SHMEM_LEN , 0666) < 0)
{
semunlock();
return -1;
}
//取已用长度
plen = (int*)g_pBusiShareMem;
if (plen == NULL)
{
semunlock();
return -1;
}
if (actual_size > *plen)
actual_size = *plen;
memcpy(pOut , g_pBusiShareMem + sizeof(int) + offset ,actual_size);
semunlock();
return actual_size;
}
static void communicationSigHandler(int signo)
{
if(signo == communication_sig_t[0]) // start
{
if( semVal(pkg->sem_id , 0) > 0 )
{
semlock(pkg->sem_id , 0);
}
}
else if(signo == communication_sig_t[1]) // stop
{
if( semVal(pkg->sem_id , 0) == 0)
{
semunlock(pkg->sem_id , 0);
}
}
else if(signo == communication_sig_t[2]) // koniec
{
sigHandler(common_sig_t[2]);
}
}