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detached(true) option for thread_create/3
A thread that has been completed without thread_join/2 being called on it is partly reclaimed: the Prolog stacks are released and the C thread is destroyed. A small data structure representing the exit status of the thread is retained until thread_join/2 is called on the thread. Defined values for Status are:
Note that the pthread primitive pthread_join() cannot be interrupted. Some systems provide pthread_timedjoin_np(). If this is provided thread_join/2 is implemented as a loop of timed joins with a 0.25 sec timeout while signals are being tested after each timeout. Such systems allow combining thread_join/2 with call_with_time_limit/2 as well as signalling threads blocked in thread_join/2 using thread_signal/2.