Threading issue

"Des Smith" <[email protected]> Wed, 18 Dec 2002 08:45:58 -0000

Newsgroups	gmane.network.beep.beepcore.c.general
Message-ID	<000001c2a671$e33dab20$b80112ac@DESSMITH>

I find that intermittently the fiostate_unblock_write() is hanging as
something is holding onto the 
 
ios->pn->lock. 
 
Im using gdb and looking at the process threads. Looking at the code I
noticed that in the file
 
bp_fcbeeptcp.c in the notify_Lower routine I see the following lines 
 
 
Notify_lower()
{
            ..
            ..
            ..
            .
 
case 3:
                SEM_POST(&thisio->lock);  
                if (thisio->state >= IOS_STATE_ACTIVE)
                    thisio->state=IOS_STATE_WRITE_PENDING;
                SEM_POST(&thisio->lock);
                fiostate_unblock_write(thisio);
                break;
            default:
 
}
 
To me this doesnt look right. Ie it looks like you should have
SEM_WAIT(&thisio->lock) after the case statement.
 
Using gdb by printing the ios-pn->lock variable ie see a count of 17.
Could this be causing the hanging? 
 
Has only else seen this behaviour? 
 
Thanks for your help
Des Smith.