0 for the most recent generation, 1 for the most recent two generations, and so on up to a maximum (usually 3). Numbers outside this range signal an error.
A real number.
try-move-in-generation finds the most fragmented segment in the generation specified. If time-threshold is positive, it moves objects out of this segment, leaving it empty, and repeats this operation until time-threshold seconds have elapsed. At this point
try-move-in-generation returns, with value
t if at least one segment was moved and value
nil otherwise. Because the operation cannot be stopped in the middle, the actual time taken will always be larger than time-threshold.
If fraction-threshold is 1,
try-move-in-generation does nothing. If fraction-threshold is 0,
try-move-in-generation will move all uncompacted segments (unless it runs out of time). With the default (0.25)
try-move-in-generation moves only moderately fragmented segments.
If time-threshold is negative, then
try-move-in-generation does not actually move any segments. result is a boolean indicating whether
try-move-in-generation would actually try to move a segment if it were to be called with a positive time-threshold and the other arguments unchanged.
try-move-in-generation is implemented only in 32-bit LispWorks. It is not relevant to the Memory Management API in 64-bit implementations, where marking-gc with the what-to-copy argument offers similar functionality (although set-blocking-gen-num is intended to solve the problem of fragmentation automatically).
LispWorks User Guide and Reference Manual - 20 Sep 2017