How do you unsubscribe? On Monday 01 March 2004 12:49, you wrote: > ----- Original Message ----- > From: <[log in to unmask]> > To: <[log in to unmask]> > Sent: Monday, March 01, 2004 5:14 PM > Subject: Ada Tasks accessing a protected object > > > Hi, > > >Could anybody help me with a tasking problem I am experiencing in ADA? > > > >I have a protected object (PO), and when a single task accesses this PO, > > then everything is fine. > > >As soon as I have more then one task trying to access the PO, the software > > hangs as soon as the 2nd task trys to gain access. > > >What could cause this to happen? > > The most likely thing is that the first task never releases the PO. > The second task therefore is blocked. This should cause the first task > to continue, but if it's waiting for the second task to do something, > ie waiting for a resource blocked by the second task, then you have a > deadlock. > > What code are you using? What compiler? Gnat 13+ handles POs quite well > in my experience, so if you're using Gnat, it's unlikely that it's a > compiler problem. > > To state the obvious, Judicious use of PUT_LINEs on acquisition and release > entries of the PO will probably reveal the cause. Of course, a Debugger > would be better, but isn't neccessary.