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felix <felix@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> writes: > As the document correctly points out, calls from Scheme to C can be > a lot more efficient, if it is known that callbacks into Scheme do > not occur. This applies to Chicken (for example), where all sorts > of weird things happen in such a case. So, here I'm down on my > knees, *begging* for separate forms of Scheme->C calls that forbid > callbacks. This also simplifies the case when threads are involved > (if thread-switches can only occur in Scheme code). Note that > Scheme->C calls outnumber Scheme->C->Scheme ones usually by a large > amount. Could you give details about the sorts of optimizations this information enables?