static void timerHandler(int sig, siginfo_t *si, void *uc)
{
timer_t *tidp;
tidp = si->si_value.sival_ptr;
if (*tidp == firstTimerID)
TASK1(Task2ms_Raster);
else if (*tidp == secondTimerID)
TASK2(Task10ms_Raster);
else if (*tidp == thirdTimerID)
TASK3(Task100ms_Raster);
}
static int makeTimer(char *name, timer_t *timerID, int expireMS, int intervalMS)
{
//sigset_t mask;
struct sigevent te;
struct itimerspec its;
struct sigaction sa;
int sigNo = SIGRTMIN;
/* Set up signal handler. */
memset(&sa, 0, sizeof(sa));
sa.sa_flags = SA_SIGINFO;
sa.sa_sigaction = timerHandler;
sigemptyset(&sa.sa_mask);
if (sigaction(sigNo, &sa, NULL) == -1)
{
perror("sigaction");
}
/* Set and enable alarm */
te.sigev_notify = SIGEV_SIGNAL;
te.sigev_signo = sigNo;
te.sigev_value.sival_ptr = timerID;
timer_create(CLOCK_REALTIME, &te, timerID);
its.it_interval.tv_sec = 0;
its.it_interval.tv_nsec = intervalMS * 1000000;
its.it_value.tv_sec = 0;
its.it_value.tv_nsec = expireMS * 1000000;
timer_settime(*timerID, 0, &its, NULL);
return 1;
}
int CreateSocket()
{
socklen_t len = sizeof(client);
// Socket creation for UDP
acceptSocket = socket(AF_INET, SOCK_DGRAM, 0);
if (acceptSocket == -1)
{
printf("Failure: socket creation is failed, failure code\n");
return 1;
}
else
{
printf("Socket started!\n");
}
//non blocking mode
/* rc = ioctl(acceptSocket, FIONBIO, (char *)&flag);
if (rc < 0)
{
printf("\n ioctl() failed \n");
return 0;
}*/
//Bind the socket
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
rc = bind(acceptSocket, (struct sockaddr*) &addr, sizeof(addr));
if (rc == -1)
{
printf("Failure: listen, failure code:\n");
return 1;
}
else
{
printf("Socket an port %d \n", port);
}
if (acceptSocket == -1)
{
printf("Fehler: accept, fehler code:\n");
return 1;
}
else
{
while (rc != -1)
{
rc = recvfrom(acceptSocket, buf, 256, 0, (struct sockaddr*) &client,
&len);
if (rc == 0)
{
printf("Server has no connection..\n");
break;
}
if (rc == -1)
{
printf("something went wrong with data %s", strerror(errno));
break;
}
XcpIp_RxCallback((uint16) rc, (uint8*) buf, (uint16) port);
makeTimer("First Timer", &firstTimerID, 2, 2); //2ms
makeTimer("Second Timer", &secondTimerID, 10, 10); //10ms
makeTimer("Third Timer", &thirdTimerID, 100, 100); //100ms
while (1)
;;
}
}
close(acceptSocket);
return 0;
}
int main()
{
Xcp_Initialize();
CreateSocket();
return 2;
}
void XcpApp_IpTransmit(uint16 XcpPort, Xcp_StatePtr8 pBytes, uint16 numBytes)
{
if ((long) XcpPort == port)
{
sentbytes = sendto(acceptSocket, (char*) pBytes, (long) numBytes, 0,
(struct sockaddr*) &client, sizeof(client));
}
XcpIp_TxCallback(port, (uint16) sentbytes);
}
我正在研究客户端和服务器架构。服务器代码如上所示，我创建了一个套接字，通过ip地址和端口号从客户端接收请求。服务器正在等待来自客户端的请求并将响应发送回客户端。当它从客户端接收数据时，它应该调用定时器任务（即我的代码中的callBackTimers），为此我还创建了定时器来每2ms，10ms和100ms调用任务。
我的问题：在调试模式下 - 控制正在进入maketimer函数调用，但它没有自动运行（我没有添加任何断点）。它正在停止在maketimer3。如何使它运行而不停止??
答案 0 :(得分：1)
正如我在previous question中回答的那样，这个可能与您的CreateSocket功能有关，即：
while(rc!=-1)
{
rc=recvfrom(acceptSocket,buf, 256, 0, (struct sockaddr*) &client, &len);
if(rc==0)
{
printf("Server has no connection..\n");
break;
}
if(rc==-1)
{
printf("something went wrong with data %s", strerror(errno));
break;
}
XcpIp_RxCallback( (uint16) rc, (uint8*) buf, (uint16) port );
makeTimer("First Timer", &firstTimerID, 2, 2); //2ms
makeTimer("Second Timer", &secondTimerID, 10, 10); //10ms
makeTimer("Third Timer", &thirdTimerID, 100, 100); //100ms
while(1)
;;
}
您每次通过此循环创建新计时器。你永远不会删除它们。您可以创建多少计时器是有限制的。来自man (2) timer_create：
内核为使用timer_create（）创建的每个计时器预分配“排队的实时信号”。因此，定时器的数量受RLIMIT_SIGPENDING资源限制的限制（请参阅setrlimit（2））。
您没有检查timer_create的返回代码状态，我的猜测是您的计时器耗尽，然后才失败。
（顺便说一句，不确定while(1);;应该做什么。我理解你必须感受到的挫败感，但这已成为一个移动目标。）
答案 1 :(得分：0)
这是一个匆忙（但我认为准确）的代码切碎版本。由于while(1);中的CreateSocket，它只会创建3个计时器。如果你运行它，你会看到TASKS1 / 2/3运行。这本身并不是你的问题。
#define _POSIX_C_SOURCE 199309
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
timer_t firstTimerID, secondTimerID, thirdTimerID;
void TASK1() {printf("task 1\n");}
void TASK2() {printf("task 2\n");}
void TASK3() {printf("task 3\n");}
static void timerHandler(int sig, siginfo_t *si, void *uc)
{
timer_t *tidp;
tidp = si->si_value.sival_ptr;
if (*tidp == firstTimerID)
TASK1();
else if (*tidp == secondTimerID)
TASK2();
else if (*tidp == thirdTimerID)
TASK3();
}
static int makeTimer(char *name, timer_t *timerID, int expireMS, int intervalMS)
{
//sigset_t mask;
struct sigevent te;
struct itimerspec its;
struct sigaction sa;
int sigNo = SIGRTMIN;
/* Set up signal handler. */
memset(&sa, 0, sizeof(sa));
sa.sa_flags = SA_SIGINFO;
sa.sa_sigaction = timerHandler;
sigemptyset(&sa.sa_mask);
if (sigaction(sigNo, &sa, NULL) == -1)
{
perror("sigaction");
}
/* Set and enable alarm */
te.sigev_notify = SIGEV_SIGNAL;
te.sigev_signo = sigNo;
te.sigev_value.sival_ptr = timerID;
timer_create(CLOCK_REALTIME, &te, timerID);
its.it_interval.tv_sec = 0;
its.it_interval.tv_nsec = intervalMS * 1000000;
its.it_value.tv_sec = 0;
its.it_value.tv_nsec = expireMS * 1000000;
timer_settime(*timerID, 0, &its, NULL);
return 1;
}
int CreateSocket()
{
int rc = 5;
while (rc != -1)
{
makeTimer("First Timer", &firstTimerID, 2, 2); //2ms
makeTimer("Second Timer", &secondTimerID, 10, 10); //10ms
makeTimer("Third Timer", &thirdTimerID, 100, 100); //100ms
while (1);;
}
return 0;
}
int main()
{
CreateSocket();
return 2;
}
注意循环问题，看看你必须从哪里去。创建3个计时器。如果您只希望它们每个插槽读取一次，那么要么没有间隔值，所以它们不会重复关闭或重置定时器（即将值/间隔值清零）他们第一次出发后。但在任何一种情况下，你都应该重复使用它们。