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#1 (permalink)

12-12-2006

jonas.gabriel jonas.gabriel is offline

Registered User

Join Date: Nov 2006

Posts: 17

Loosing signals even with sigqueue

Hi everyone,

I have a process that forks many times.At a random time point the children must send a SIGUSR1 to the parent.To do that I'm using a pair of sigaction & sigqueue.However many signals are getting lost.
Here are some code segments:
a)sigaction

Code:

sigset_t mask_set;	/* used to set a signal masking set. */
	sigfillset(&mask_set);


	struct sigaction act;
	act.sa_sigaction=catch_usr1;
	act.sa_mask=mask_set;
	act.sa_flags=SA_SIGINFO | SA_RESTART;

	sigaction(SIGUSR1,&act,NULL);

b)signal handler

Code:

void catch_usr1(int sig,siginfo_t *a,void *b )
{
	sigcount++;
	if (readers>0)
		readers--;
	else
		writing=false;
	printf("[LOG] Signal received. Readers now: %d Signal counter: %d\n",readers,sigcount);
	fflush(stdout);
}

c)sigqueue

Code:

tmp=sigqueue(getppid(),SIGUSR1,vsig);

Can anybody find an error

Last edited by jonas.gabriel; 12-12-2006 at 05:48 AM..

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