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Blurb about new guarantee of port-for-each

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Marius Vollmer 2001-02-09 14:36:27 +00:00
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@ -109,6 +109,15 @@ Example:
* Changes to Scheme functions and syntax
** `port-for-each' makes an additional guarantee.
From the docstring: @var{proc} is applied exactly once to every port
that exists in the system at the time @var{port-for-each} is invoked.
Changes to the port table while @var{port-for-each} is running have no
effect as far as @var{port-for-each} is concerned.
This guarantee is important to make (ice-9 popen) work reliable.
** The semantics of guardians have changed.
The changes are for the most part compatible. An important criterion