*simple-vector-sort-strategy*

This variable provides the default value for the strategy keyword argument to the sort function as implemented in Allegro CL. The strategy argument is an Allegro CL extension. It is not necessary to supply a value for that argument when calling sort and the initial value of this variable suffices in all cases. See Extensions to cl:sort in implementation.htm for more information.

The value of this variable must be one of the following:

• :stack (the initial value): if possible, when sorting a vector, allocate the needed scratch vector, used during sorting, on the stack. If allocating on the stack is not possible, allocate it in the Lisp heap.
• :alloc: when sorting a vector, allocate the needed scratch vector in the Lisp heap.
• A vector: This value is not recommended as the value of this variable because the vector will be used by every call to sort where the strategy keyword argument is not explicitly specified, and this can lead to errors because competing calls to sort (perhaps in different threads) will operate on the same vector. If you want to specify your own vector, create one for use in a specific thread and pass it as the strategy argument in your calls to sort. (sort is often called by system functions and the values of the strategy argument used by system functions is such calls is not specified.)

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Created 2019.8.20.