0
因此,直到最近,我們決定將它移動到Lubuntu 12.04系統時,此代碼運行良好。到timer_settime調用返回EINVAL,並在gdb下運行它,我已經證實,所有TS領域都在0到999999999,在它被調用的時候:即使設置了itimerspec的所有成員,timer_settime也會失敗
1067 if(-1 ==timer_settime(tid,0,&ts,NULL))
(gdb) print ts
$1 = {it_interval = {tv_sec = 0, tv_nsec = 200000000}, it_value = {tv_sec = 0,
tv_nsec = 0}}
因爲這應該是唯一這可能會導致它返回EINVAL我非常困惑。也許這裏有一些明顯的東西,我錯過了。
struct sigevent sev;
struct itimerspec ts;
timer_t *tid;
//actually point the pointer at something.
tid = calloc(1,sizeof(timer_t));
//make sure there's no garbage in the structures.
memset(&sev,0,sizeof(struct sigevent));
memset(&ts,0, sizeof(struct itimerspec));
//notify via thread
sev.sigev_notify = SIGEV_THREAD;
sev.sigev_notify_function = SwitchThreadHandler;
sev.sigev_notify_attributes = NULL;
sev.sigev_value.sival_ptr = tid;
ts.it_value.tv_sec =0;
ts.it_value.tv_nsec = 0;
ts.it_interval.tv_sec = 0;
ts.it_interval.tv_nsec = 200000000;
if(-1 == timer_create(CLOCK_REALTIME,&sev,tid))
{
retval = EX_SOFTWARE;
fprintf(stderr,"Failed to create timer.");
free(tid);
return retval;
}
if(-1 ==timer_settime(tid,0,&ts,NULL))
{
int errsv = errno;
fprintf(stderr,"timer_settime FAILED!!!\n");
if(errsv == EINVAL)
{
fprintf(stderr,"INVALID VALUE!\n");
}
else
{
fprintf(stderr,"UNKOWN ERROR: %d\n",errsv);
}
return EX_SOFTWARE;
}
奇怪的是,gcc -Wall並沒有透露這一點,它在我們嘗試過的四種環境中的三種情況下完美運行。奇怪的。那麼,現在它不再失敗,但計時器不會失敗,所以你回答了我問的問題。 –