[project @ 2005-05-10 13:25:41 by simonmar]
Two SMP-related changes: - New storage manager interface: bdescr *allocateLocal(StgRegTable *reg, nat words) which allocates from the current thread's nursery (being careful not to clash with the heap pointer). It can do this without taking any locks; the lock only has to be taken if a block needs to be allocated. allocateLocal() is now used instead of allocate() in a few PrimOps. This removes locks from most Integer operations, cutting down the overhead for SMP a bit more. To make this work, we have to be able to grab the current thread's Capability out of thin air (i.e. when called from GMP), so the Capability subsystem needs to keep a hash from thread IDs to Capabilities. - Small MVar optimisation: instead of taking the global storage-manager lock, do our own locking of MVars with a bit of inline assembly (x86 only for now).