有個bug這兩天一直沒有解決掉，請各位大佬幫幫忙，分析一下
主函式是這樣的：
int main(int argc,char *argv[])
{
pthread_t tid_0,tid_1,tid_2,tid_3,tid_exit;
//ParaOfCommandPtr=createPetSystem();
GlobalState=createPetSystem();
sigset_t set;
sem_init(&sem_sym,0,0);
sigemptyset(&set);
sigaddset(&set, SIGALRM);
sigaddset(&set, SIGPIPE);
pthread_sigmask(SIG_SETMASK, &set, NULL);
sleep(1);
pthread_create(&tid_0,NULL,tcp_dispatch,NULL);
pthread_create(&tid_1,NULL,local_dispatch,NULL);
pthread_create(&tid_2,NULL,local_task_timer,argv[0]);
local_unix_connfd=connnect_local_socket();
pthread_create(&tid_3,NULL,local_server_loop,NULL);
if(pthread_create(&tid_exit,NULL,wait_exit,argv[0])!=0){
perror("pthread_exit_create");
}
tcp_server_loop(local_unix_connfd);
destroyPetSystem(GlobalState);
return 0;
}
其中local_task_timer函式：
void *local_task_timer(void * arg)
{
int connect_fd;
int ret;
char buffer[4]={0};
char bufferReceive[4]={0};
static struct sockaddr_un srv_addr;
pthread_detach(pthread_self());
connect_fd=socket(PF_UNIX,SOCK_STREAM,0);
if(connect_fd<0){
perror("cannot creat socket");
pthread_exit(NULL);
}
srv_addr.sun_family=AF_UNIX;
strcpy(srv_addr.sun_path,UNIX_LOCAL_DOMAIN);
while(1)
{
ret=connect(connect_fd,(struct sockaddr*)&srv_addr,sizeof(srv_addr));
if (ret<0){
perror("cannot connect server");
sleep(1);
//close(connect_fd);
}
else
break;
}
printf("timer connect success %d\n",ret);
if(arg!=NULL)
{
if(strcmp((char *)arg,"swift"))
{
mesgid2buffer(buffer,C_INIT);
}
else
{
mesgid2buffer(buffer,C_INIT_SWIFT);
}
}
//mesgid2buffer(buffer,C_INIT);
send(connect_fd,buffer,4,MSG_DONTWAIT);
printf("connect local tcp server is %d\n",connect_fd);
ret=read(connect_fd,bufferReceive,sizeof(bufferReceive));
if(ret>0)
printf("receive init responce successfully.\n");
int nbytes=0;
struct timeval timeout={30,0};
fd_set fdR;
for(;;)
{
//printf("system start.\n");
timeout.tv_sec=1;
timeout.tv_usec=0;
FD_ZERO(&fdR);
FD_SET(connect_fd,&fdR);
switch(select(connect_fd+1,&fdR,NULL,NULL,&timeout))
{
case -1:
DEV_PRINT("no input\n");
syslog(LOG_LOCAL0 | LOG_INFO,"UnixTimerState: socket no input.");
//goto disconnect;
break;
case 0:
DEV_PRINT("time is out\n");
mesgid2buffer(buffer,C_Read_SystemStatus);
send(connect_fd,buffer,4,MSG_DONTWAIT);
mesgid2buffer(buffer,C_SystemMonitor);
send(connect_fd,buffer,4,MSG_DONTWAIT);
mesgid2buffer(buffer,C_Internal_PscStatus);
send(connect_fd,buffer,4,MSG_DONTWAIT);
//syslog(LOG_LOCAL0 | LOG_INFO,"TcpState: Tcp connection time out.");
//goto disconnect;
continue;
default:
if(FD_ISSET(connect_fd,&fdR)==0)
{
DEV_PRINT("nothing to read\n");
syslog(LOG_LOCAL0 | LOG_INFO,"UnixTimerState: socket connection nothing to read.");
//goto disconnect;
}
//決議資料包
else
{
if((nbytes=read(connect_fd,bufferReceive,sizeof(bufferReceive)))==-1)// read failed
{
fprintf(stderr,"Read Error:%s\a\n",strerror(errno));
syslog(LOG_LOCAL0 | LOG_INFO,"UnixTimerState: Socket Read Error.TCP pthread exit.");
//goto disconnect;
}
else if(nbytes==0)//read nothing
{
DEV_PRINT("transmit nothing.TCP connection broken\n");
syslog(LOG_LOCAL0 | LOG_INFO,"UnixTimerState: transmit nothing.socket connection broken.socket pthread release.\n");
//goto disconnect;
}
else // read success
{
send(connect_fd,bufferReceive,4,MSG_DONTWAIT);
}
}
}
}
/*
while(1)
{
mesgid2buffer(buffer,C_Read_SystemStatus);
send(connect_fd,buffer,4,MSG_DONTWAIT);
mesgid2buffer(buffer,C_SystemMonitor);
send(connect_fd,buffer,4,MSG_DONTWAIT);
sleep(1);
}
*/
close(connect_fd);
pthread_exit(NULL);
}
這段函式就是一秒鐘發送一次系統狀態查詢給到自己，其中的 C_Read_SystemStatus和C_SystemMonitor用于查詢系統狀態和系統錯誤資訊
struct CommandIDAction CommandMap[COMMAND_COUNT]={
{C_ErrorMessage,errorSystem},
{C_SystemMode,configSystem},
{C_CTStart,ctonSystem},
{C_CTEnd,ctoffSystem},
{C_PETPlan,planSystem},
{C_PETPlay,playSystem},
{C_ACQRawData,acqSystem},
{C_Stop,stopSystem},
{C_EndExam,endSystem},
{C_ShutDown,shutSystem},
{C_Reboot,rebootSystem},
{C_WriteFlash,wflashSystem},
{C_ReadFlash,rflashSystem},
{C_FileImport,importSystem},
{C_TempCalibration,tempcalibrationSystem},
{C_UpdateHyper,uhyperSystem},
{C_ReadTestPattern,tpatternSystem},
{C_ReadSignalPattern,spatternSystem},
{C_ReadBlockRate,blockrateSystem},
{C_FrontParaConfigure,frontparaSystem},
{C_TDCCalibrationOutputEnable,tdconSystem},
{C_TDCCalibrationOutputDisable,tdcoffSystem},
{C_WriteComponentPost,writecomponentpostSystem},
{C_ReadComponentPost,readcomponentpostSystem},
{C_No_ShutDown,NoshutSystem},
{C_INIT,initSystem},
{C_Read_SystemStatus,systemStatusSystem},
{C_SystemMonitor,systemMonitorSystem},
{C_Internal_PowerOff,InternalPoweOffSystem},
{C_INIT_SWIFT,initSystemSwift},
{C_Internal_SystemConfigure,InternalConfigureSystem},
{C_HandShake,HandShakeSystem},
{C_FrontParaConfigure_Parallel,frontparaParallelSystem},
{C_TempcalibrationResult,tempcalibrationresultSystem},
{C_CcbLogicUpdate,CcbUpdateSystem},
{C_Internal_PscStatus,PscStatusStatus},
{C_Cross_Acq_Configure,crossAcqConfigureSystem}
};
systemMonitorSystem和PscStatusStatus對應的函式分別為：
void* systemMonitorSystem(void *arg)
{
//DigitalPetSystemPtr instance=(DigitalPetSystemPtr) arg;
struct TcpCommandState* state=(struct TcpCommandState*) arg;
system_monitor(state->rsystemmonitor(state));
}
void* PscStatusStatus(void *arg)
{
struct TcpCommandState* state=(struct TcpCommandState*) arg;
psc_system_status_monitor(state->rpscstatus(state));
}
void system_monitor(int state_code)
{
DEV_PRINT("system monitor init end\n");
//struct timespec outtime;
struct timeval start,end;
static xmlChar buffer[307200];
static int size=0;
//int ret=0;
ProtobufCBinaryData data;
if(state_code<0)
{
gettimeofday(&start,NULL);
sem_wait(&sem_sym);
system_monitor_read(buffer,&size,ProductType);
gettimeofday(&end,NULL);
syslog(LOG_LOCAL0 | LOG_INFO,"ReadSystemMonitor: TimeUsed is %ld usec.",(end.tv_sec-start.tv_sec)*1000000+end.tv_usec-start.tv_usec);
}
data.len=size;
data.data=https://bbs.csdn.net/topics/malloc(size);
memcpy(data.data,buffer,size);
pack_message_layer(data,0,C_SystemMonitor);
free(data.data);
}
void psc_system_status_monitor(int state_code)
{
DEV_PRINT("system psc init end\n");
struct timeval start,end;
static xmlChar buffer[102400]; //for storage last read data
ProtobufCBinaryData data;
static int size=0;
if(get_psc_monitor_start_flag()==1)
{
if(state_code<0)
{
gettimeofday(&start,NULL);
psc_status_read(buffer,&size);
gettimeofday(&end,NULL);
syslog(LOG_LOCAL0 | LOG_INFO,"ReadPscStatus: TimeUsed is %ld usec.",(end.tv_sec-start.tv_sec)*1000000+end.tv_usec-start.tv_usec);
}
data.len=size;
data.data=https://bbs.csdn.net/topics/malloc(size);
memcpy(data.data,buffer,size);
pack_message_layer(data,0,C_Internal_PscStatus);
free(data.data);
//syslog(LOG_LOCAL0 | LOG_INFO,"SendPscStatus: work is done.length is %d",size);
}
}
通過syslog記錄程式中的log發現時間跳躍了6秒并且在接下來的后三秒里每秒鐘系統狀態的打印出現多次：
這是時間跳躍的記錄，這個log是芯片對底層的探測器的命令發送進行記錄，每次發送的時間間隔其實非常短
Mar 5 15:06:59:536950 SCCB local0.info normal: Calibration para cmd data is 100d0
Mar 5 15:07:05:470621 SCCB local0.info normal: Calibration para cmd data is 100d0
Mar 5 15:07:05:470676 SCCB local0.info normal: Calibration para cmd data is 100d0
Mar 5 15:07:05:470704 SCCB local0.info normal: Calibration para cmd data is 100d0
Mar 5 15:07:05:470727 SCCB local0.info normal: Calibration para cmd data is 100d0
這是對sysmonitor的log記錄：
Line 117599: Mar 5 15:06:58:612861 SCCB local0.info normal: ReadSystemMonitor: TimeUsed is 330477 usec.
Line 50: Mar 5 15:07:05:565273 SCCB local0.info normal: ReadSystemMonitor: TimeUsed is 6281469 usec.
Line 176: Mar 5 15:07:05:744703 SCCB local0.info normal: ReadSystemMonitor: TimeUsed is 263892 usec.
Line 655: Mar 5 15:07:05:995302 SCCB local0.info normal: ReadSystemMonitor: TimeUsed is 249506 usec.
Line 816: Mar 5 15:07:06:178203 SCCB local0.info normal: ReadSystemMonitor: TimeUsed is 217916 usec.
Line 1122: Mar 5 15:07:06:418760 SCCB local0.info normal: ReadSystemMonitor: TimeUsed is 239407 usec.
Line 1488: Mar 5 15:07:06:769160 SCCB local0.info normal: ReadSystemMonitor: TimeUsed is 277948 usec.
Line 1694: Mar 5 15:07:07:68534 SCCB local0.info normal: ReadSystemMonitor: TimeUsed is 125060 usec.
Line 2059: Mar 5 15:07:07:309927 SCCB local0.info normal: ReadSystemMonitor: TimeUsed is 240559 usec.
Line 2426: Mar 5 15:07:07:667140 SCCB local0.info normal: ReadSystemMonitor: TimeUsed is 197846 usec.
Line 2794: Mar 5 15:07:08:644053 SCCB local0.info normal: ReadSystemMonitor: TimeUsed is 351568 usec.
Line 3160: Mar 5 15:07:09:645036 SCCB local0.info normal: ReadSystemMonitor: TimeUsed is 351520 usec.
這是對systemstatus的log記錄：
Line 117601: Mar 5 15:06:58:682515 SCCB local0.info normal: ReadPscStatus: TimeUsed is 400299 usec.
Line 46: Mar 5 15:07:05:480271 SCCB local0.info normal: ReadPscStatus: TimeUsed is 6196600 usec.
Line 560: Mar 5 15:07:05:900299 SCCB local0.info normal: ReadPscStatus: TimeUsed is 61795 usec.
Line 650: Mar 5 15:07:05:959540 SCCB local0.info normal: ReadPscStatus: TimeUsed is 393358 usec.
Line 1200: Mar 5 15:07:06:490233 SCCB local0.info normal: ReadPscStatus: TimeUsed is 494076 usec.
Line 1591: Mar 5 15:07:06:942952 SCCB local0.info normal: ReadPscStatus: TimeUsed is 326260 usec.
Line 1607: Mar 5 15:07:06:948688 SCCB local0.info normal: ReadPscStatus: TimeUsed is 662791 usec.
syslog中記錄的日志時間明顯有一段時間沒記，并且后面每秒的記錄中出現一秒鐘記錄多次系統時間的問題，請問各位大佬這是什么原因如何解決？？在此萬分感謝！！！
uj5u.com熱心網友回復：
uj5u.com熱心網友回復：
原來不是程式問題啊系統管理員表示一般這種情況不是一段時間沒記，而是“那段時間”消失了
一個系統的實時鐘隨著系統的繁忙程度的提高傾向于偏慢，對表行程撥快時鐘的時候看起來就會“消失”一段時間
ntpd或者chronyd之類的行程隔三岔五地修正一下系統時間，你可以對照一下它們的log
uj5u.com熱心網友回復：
我們使用的作業系統相當有彈性，我的意思是，它們不適合做那種時間精密型操作。因為快取的存在，寫入個檔案還有可能被拖后幾秒呢。
所以長期運行的軟體系統里幾秒這種等級的時間誤差很難去較真兒。
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標籤：C語言
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