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We need this, or something equivalent, to be able to implement
stgAllocForGMP outside of the rts. That's because we want to use
allocateLocal which allocates from the given capability without
having to take any locks. In the gmp primops we're basically in
an unsafe foreign call, that is a context where we hold a current
capability. So it's safe for us to use allocateLocal. We just
need a way to get the current capability. The method to get the
current capability varies depends on whether we're using the
threaded rts or not. When stgAllocForGMP is built inside the rts
that's ok because we can do it conditionally on THREADED_RTS.
Outside the rts we need a single api we can call without knowing
if we're talking to a threaded rts or not, hence this addition.
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Really we should be raising an exception in this case, but that's
tricky (see comments). At least now we shut down the runtime
correctly rather than just exiting.
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2301: Control-C now causes the new exception (AsyncException
UserInterrupt) to be raised in the main thread. The signal handler
is set up by GHC.TopHandler.runMainIO, and can be overriden in the
usual way by installing a new signal handler. The advantage is that
now all programs will get a chance to clean up on ^C.
When UserInterrupt is caught by the topmost handler, we now exit the
program via kill(getpid(),SIGINT), which tells the parent process that
we exited as a result of ^C, so the parent can take appropriate action
(it might want to exit too, for example).
One subtlety is that we have to use a weak reference to the ThreadId
for the main thread, so that the signal handler doesn't prevent the
main thread from being subject to deadlock detection.
1619: we now ignore SIGPIPE by default. Although POSIX says that a
SIGPIPE should terminate the process by default, I wonder if this
decision was made because many C applications failed to check the exit
code from write(). In Haskell a failed write due to a closed pipe
will generate an exception anyway, so the main difference is that we
now get a useful error message instead of silent program termination.
See #1619 for more discussion.
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See #753
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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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