31. A trap semaphore as recited in claim 30 including seventh means responsive to said second process for requesting on behalf of said second process one of said queued message notifications of said trap event occurrence.
31. A trap semaphore as recited in claim 30 including seventh means responsive to said second process for requesting on behalf of said second process one of said queued message notifications of said trap event occurrence. 32. A trap semaphore as recited in claim 31 including eighth means responsive to said seventh means for dequeueing said message notification from said second means.