erts: Add BIFs processes_first/0 and processes_next/1
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This PR adds 2 BIFs to the `erlang` module. `processes_first/0` returns a process iterator that can be used to iterate through the process table. `process_next/1` takes in a process iterator and returns a 2-tuple, consisting of one process identifier and a new process iterator. If the process iterator runs out of processes in the process table, `none` will be returned. By using these 2 BIFs instead of `processes/0`, one can avoid creating a potentially huge list of the pids for all existing processes, at the cost of less consistency guarantees. Process identifiers returned from consecutive calls of `process_next/1` may not be a consistent snapshot of all elements existing in the table during any of the calls.
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This PR adds 2 BIFs to the
erlangmodule.processes_first/0returns a process iterator that can be used to iterate through the process table.process_next/1takes in a process iterator and returns a 2-tuple, consisting of one process identifier and a new process iterator. If the process iterator runs out of processes in the process table,nonewill be returned.By using these 2 BIFs instead of
processes/0, one can avoid creating a potentially huge list of the pids for all existing processes, at the cost of less consistency guarantees. Process identifiers returned from consecutive calls ofprocess_next/1may not be a consistent snapshot of all elements existing in the table during any of the calls.