how to set timer in a new thread??

GENERAL Help
1

I try to set a timer in a new created thread, but it’s not working when the timer set in the thread, my code is below:

[code]int main( )

{
int flag=1;
// Initialise I/O permitions to ISA card memory address

 struct pci_dev_info info; 
 void *hdl; 
 int i,jj; 
 char F; 
 pthread_attr_t  attr; //thread 
 pthread_attr_init( &attr ); 
  pthread_attr_setdetachstate( &attr,     PTHREAD_CREATE_DETACHED ); 
  pthread_create( NULL, &attr, &sockthread, NULL );

}

void* sockthread( )
{

int i;

//========================timer setup20100623
struct sigevent event;
struct itimerspec itime;
timer_t timer_id;
int chid;
int rcvid;
my_message_t msg;
int conid;
//===================================timer setup 20100623
//=============below set timer 20100623

chid = ChannelCreate(0);
conid=ConnectAttach(ND_LOCAL_NODE, 0, chid, _NTO_SIDE_CHANNEL, 0)ï¼›
event.sigev_notify = SIGEV_PULSE;
event.sigev_coid = ConnectAttach(ND_LOCAL_NODE, 0,
chid,
_NTO_SIDE_CHANNEL, 0);
event.sigev_priority = getprio(0);
event.sigev_code = MY_PULSE_CODE;
timer_create(CLOCK_REALTIME, &event, &timer_id);

itime.it_value.tv_sec = 0;
// 500 million nsecs = .004 secs
itime.it_value.tv_nsec = 4000000;
itime.it_interval.tv_sec = 0;
// 500 million nsecs = .004 secs
itime.it_interval.tv_nsec = 4000000;
timer_settime(timer_id, 0, &itime, NULL);
//=============below set timer 20100623
for (;:wink:
{
rcvid = MsgReceive(chid, &msg, sizeof(msg), NULL);

if (rcvid ==0) 
{ 
             if(msg.pulse.code == MY_PULSE_CODE) 
        {

printf(“we got a pulse from our timer\n”);
}
}
}
[/code]
It is a simple test, butrcvid always go wrong,please help!!
THANKS A LOTS

2

SnowingFish,

Personally I create my timers like so:

timer_t timerId;
struct sigevent event;
int conid; 
int userId = 999;  // Normally this is a unique identifier if you have more than 1 timer

chid = ChannelCreate(0); 

SIGEV_PULSE_INIT(&event, ConnectAttach_r(ND_LOCAL_NODE, 0, chid, _NTO_SIDE_CHANNEL, 0), SIGEV_PULSE_PRIO_INHERIT, 0, userId);

if ((timerId = TimerCreate_r(CLOCK_REALTIME, &event)) < 0)
{
   printf ("Error %d\n", timerId);
   exit(-1);
}

Then you can do your timer initialization etc.

Out of curiosity, what is rcvid giving you if it’s not 0? I assume -1 in which case you should tell us what the error code is.

Tim

3

Thx Tim,

I misunderstood the function, I thought there can be more then one timer in one process… :blush: , Actually I just use multi-thread, and I assume the timer create a new thread when it trigger, right?

Thank you!

4

SnowingFish,

There definitely can be more than one timer in one process. There can also be more than one timer in one thread.

timer_t timerId1, timerId2;
struct sigevent event;
int conid;
int userId1 = 1;
int userId2 = 2;

chid = ChannelCreate(0);

SIGEV_PULSE_INIT(&event, ConnectAttach_r(ND_LOCAL_NODE, 0, chid, _NTO_SIDE_CHANNEL, 0), SIGEV_PULSE_PRIO_INHERIT, MY_PULSE_CODE, userId1);

if ((timerId1 = TimerCreate_r(CLOCK_REALTIME, &event)) < 0)
{
   printf ("Error %d\n", timerId);
   exit(-1);
} 

SIGEV_PULSE_INIT(&event, ConnectAttach_r(ND_LOCAL_NODE, 0, chid, _NTO_SIDE_CHANNEL, 0), SIGEV_PULSE_PRIO_INHERIT, MY_PULSE_CODE, userId2);

if ((timerId2 = TimerCreate_r(CLOCK_REALTIME, &event)) < 0)
{
   printf ("Error %d\n", timerId);
   exit(-1);
} 

// I am not showing the setup of the timer times...


for (;;)
{
    rcvid = MsgReceive(chid, &msg, sizeof(msg), NULL);
         
    if (rcvid ==0)
    {
         if(msg.pulse.code == MY_PULSE_CODE) 
         {
             if(msg.timerPulse.value.sival_int == userId1)
             {
                printf("we got a pulse from timer1\n");
             }
             if(msg.timerPulse.value.sival_int == userId2)
             {
                printf("we got a pulse from timer2\n");
             }
         }
     }
}

No, a timer does not create a thread when it is created or when it triggers. It’s entirely handled in the kernel.

Tim

5

Thx very much, Tim, I got it…