我正在使用timer_create
在Linux中创建计时器。回调原型:使用timer_create传递用户数据
static void TimerHandlerCB(int sig, siginfo_t *extra, void *cruft)
如何传递用户数据,这样我可以在定时器超时后调用的回调收到相同。
这里是我的示例代码:
int RegisterTimer(iDiffInTime)
{
struct sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_SIGINFO; /*call our handler*/
sa.sa_sigaction = TimerHandlerCB;/*Event handler to be called after timer expires*/
if(sigaction(SIGRTMAX, &sa, NULL) < 0)
{
perror("sigaction");
return 1;
}
// Setup the timer
sigevent sigev;
timer_t timerid = 0;
memset(&sigev, 0, sizeof(sigev));
sigev.sigev_notify = SIGEV_SIGNAL;
sigev.sigev_signo = SIGRTMAX;
sigev.sigev_value.sival_ptr = &timerid;
timer_t timerid;
if (timer_create(CLOCK_REALTIME, &sigev, &timerid) == 0)
{
printf("Timer created\n");
struct itimerspec itval, oitval;
itval.it_value.tv_sec = iDiffInTime * 1000;
itval.it_value.tv_nsec = 0;
itval.it_interval.tv_sec = 0;
itval.it_interval.tv_nsec = 0;
//Populate handles required in TimerCallback
Display_Handle hDisplay = ......//
Buffer_Handle hBuf = .....//
if (timer_settime(timerid, 0, &itval, &oitval) != 0)
{
perror("time_settime error!");
return 1;
}
}
else
{
perror("timer_create error!");
}
return 0
}
从哪里传hDisplay
& hBuf
,这样我可以接受他们回到TimerHandlerCB
?
C或C++的的timerId结构 的地址?选一个。 – 2011-05-10 09:05:50
@Tomalak Geret'kal:它是一个带有程序C++的遗留代码;) – 2011-05-10 09:16:13
将'.sival_ptr'设置为局部变量的地址可能不是一个好主意。 – PSkocik 2017-11-14 17:27:03