Dear All, This is a very brief note about the proposed Boost.Context that is not really worthy of being called a "review". My main point is that I am pleased to see this functionality being broken out as a separate library, rather than being hidden as a detail of a higher-level functionality e.g. co-routines. This is something that should be encouraged, and furthermore I think that the weaknesses (e.g. documentation) should be reviewed in the context of the alternative being to hide all of this inside Boost.CoRoutine and not documented at all. I have had a quick look at the ARM assembler implementation. Parameter-passing conventions especially wrt the various FP and vector registers is not something that I know much about. If I were going to use this code somewhere, I would like to see a note in the docs or in the source pointing to the reference documentation that the author used to decide what should and what should not be saved. It seems that the ARM code assembles to only three or four instructions for each function. I would have written that as inline assembler, rather than in a .S file. In my view, after this very brief look, I believe that the library should be accepted. Cheers, Phil.