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Annotation of /branches/cuda/doc/implementation/life-of-a-strand.md
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## Life of a strand
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This note documents the various stages in the life of a strand and, specifically,
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when they occur with respect to the super-steps.
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The important events in the life of a strand are:
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1. allocation
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2. initialization -- the strand initialization method is invoked when the strand
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is created; either by a ``create_grid`` or ``create_collection`` operation
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at the start of the program, or by a ``new`` operation.
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A strand created by ``new`` is visible to the program starting with the global
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update phase of the superstep in which it was created.
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3. start method (optional) --
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the start method is run during the strand-update phase prior to the strand's
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first update. Any state changes caused by the start method are **not** visible
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to other strands until the next super-step.
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4. updates --
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the strand update method is invoked each super-step as long as the strand is
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active and the program is running.
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5. termination
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* stabilize
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* die
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* global stabilize
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* global die
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