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Richard Kistruck 9c4e0d4265 Mps br/padding (non-working changelist) see whether we can clear up what "clamped" means: ... ArenaPoll will still call TracePoll if clamped... but TracePoll won't start a new trace if clamped ArenaStep won't start an opportunistic full collect if clamped ArenaStep won't advance pollThreshold, ever traceFlip asserts that clamped is FALSE. (see http://info.ravenbrook.com/mail/2010/02/23/13-19-24/0.txt) --- But no, clamped is more complex than that. - Certain mps.h calls affect it. - Certain MPS tests use it for more control and reproducibility. - MPS itself uses it, as part of starting a full collect, for which it must first run any current trace to completion without starting any new ones. In particular, this set of changes asserts: MPS ASSERTION FAILURE: ArenaGlobals(arena)->clamped == FALSE trace.c 534 because mps_arena_collect() tries to start a full collect while clamped. --- So this changelist is for historical interest only, and will be backed out. Copied from Perforce Change: 169853 ServerID: perforce.ravenbrook.com		2010-02-24 16:07:17 +00:00
mps	Mps br/padding (non-working changelist) see whether we can clear up what "clamped" means:	2010-02-24 16:07:17 +00:00