即使设置了itimerspec的所有成员,计时器\u settime也会失败
所以,这段代码一直运行良好,直到最近,我们决定将其移动到Lubuntu 12.04系统。对timer_settime的调用返回EINVAL,在gdb下运行它时,我已确认ts的所有字段在调用时都在0和99999999之间:即使设置了itimerspec的所有成员,计时器\u settime也会失败,c,timer,posix,errno,C,Timer,Posix,Errno,所以,这段代码一直运行良好,直到最近,我们决定将其移动到Lubuntu 12.04系统。对timer_settime的调用返回EINVAL,在gdb下运行它时,我已确认ts的所有字段在调用时都在0和99999999之间: 1067 if(-1 ==timer_settime(tid,0,&ts,NULL)) (gdb) print ts $1 = {it_interval = {tv_sec = 0, tv_nsec = 200000000}, it_value = {tv
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}}
因为这应该是唯一能让它返回艾因瓦尔的东西,所以我非常困惑。也许这里有一些明显的东西我遗漏了
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;
}
timer\u settime
被记录为将timer\u t
作为第一个参数,而不是timer\u t*
类似于timer\u create
。如果timerid
无效,它将使用EINVAL
失败
因此,您应该将*tid
作为第一个参数传递
请注意,您的编译器应该对此发出警告。奇怪的是,gcc-Wall没有对此给出任何提示,而且它在我们已经尝试过的四种环境中有三种环境下工作得非常好。奇怪的好吧,现在它不再失败了,但计时器从不启动,所以你已经回答了我问的问题。