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(librep.info)Thread Implementation Notes

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Thread Implementation Notes
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   The threads used by `librep' are _software threads_. This means that
they are currently implemented by manually switching in and out thread
context (i.e. the call stack) as required. There are a number of
disadvantages to this method:

   * blocking I/O blocks _all_ threads, not just the thread doing the
     I/O,

   * only a single processor is used, thereby avoiding any true
     parallelism on multi-processor systems.

The main advantage is the ease of implementation, especially when
retrofitting threads into the previously single-threaded interpreter.