$Revision: 5.0.2.4 $
Package: SYSTEM
This variable holds the stack-group that resumed *current-stack-group*, that is the stack-group that ran immediately before the current stack-group. Note that this need not be the same stack-group which is the value of the stack-group-resumer slot of the current stack-group, even though the names are similar. This variable should be treated as read only and is not usually useful in user code. Normal user code should use the mp:stack-group-resumer mechanism instead of depending on this variable for correct execution. When the Lisp multiprocessing scheduler is running, asynchronous stack-group resumption makes the value of this variable unpredictable.
USE OF THIS VARIABLE IS DEPRECATED.
Allegro CL has two models of multiprocessing, the :os-threads model and the non :os-threads model, so named because :os-threads is on the *features* list of versions that use it. This variable is used only by the non :os-threads model. The symbol naming this variable does not exist in versions using the :os-threads model. Conditionalize uses of this symbol in code that might be ported between verrsions with #-os-threads.
Note that in the future, all versions of Allegro CL may use the :os-threads model and code using this variable will not work.
See multiprocessing.htm for general information on multiprocessing in Allegro CL.
The general documentation description is in introduction.htm. The index in index.htm.
Copyright (C) 1998-1999, Franz Inc., Berkeley, CA. All Rights Reserved.