Threads

• A thread is a single flow of control within a PGENESIS script being executed.
• When a node starts, there is exactly one thread on it - the thread for the script.
• There may potentially be many threads per node. These are stacked up, with only the topmost actually executing at any moment.
• clearthread - yield to one thread awaiting execution (if one exists)
• clearthreads - yield to all threads awaiting execution

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