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This has no effect with static libraries, but when the RTS is in a
shared library it does two things:
- it prevents the function from being exposed by the shared library
- internal calls to the function can use the faster non-PLT calls,
because the function cannot be overriden at link time.
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Having a timer signal go off regularly is bad for power consumption,
and generally bad practice anyway (it means the app cannot be
completely swapped out, for example). Fortunately the threaded RTS
already had a way to detect when the system was idle, so that it can
trigger a GC and thereby find deadlocks. After performing the GC, we
now turn off timer signals, and re-enable them again just before
running any Haskell code.
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This lets the threaded RTS use SIGVTALRM rather than SIGALRM for its
interval timer signal, so the threaded and non-threaded RTS are
compatible. It unfortunately doesn't completely fix #850/#1156, for
that we really have to use a restartable sleep instead of usleep().
Also I cleaned up the timer API a little: instead of returning an
error value that ultimately gets ignored, we now report errors from
system calls and exit.
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Most of the other users of the fptools build system have migrated to
Cabal, and with the move to darcs we can now flatten the source tree
without losing history, so here goes.
The main change is that the ghc/ subdir is gone, and most of what it
contained is now at the top level. The build system now makes no
pretense at being multi-project, it is just the GHC build system.
No doubt this will break many things, and there will be a period of
instability while we fix the dependencies. A straightforward build
should work, but I haven't yet fixed binary/source distributions.
Changes to the Building Guide will follow, too.
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