Reorganisation of the source tree

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.

1 files changed, 78 insertions, 0 deletions

diff --git a/rts/RtsSignals.h b/rts/RtsSignals.h
new file mode 100644
index 0000000000..eafeeaaf55
--- /dev/null
+++ b/rts/RtsSignals.h
@@ -0,0 +1,78 @@
+/* -----------------------------------------------------------------------------
+ *
+ * (c) The GHC Team, 1998-2005
+ *
+ * Signal processing / handling.
+ *
+ * ---------------------------------------------------------------------------*/
+
+#ifndef RTS_SIGNALS_H
+#define RTS_SIGNALS_H
+
+#if !defined(PAR) && !defined(mingw32_HOST_OS)
+
+#include "posix/Signals.h"
+
+#elif defined(mingw32_HOST_OS)
+
+#include "win32/ConsoleHandler.h"
+
+#else /* PAR */
+
+#define signals_pending() (rtsFalse)
+
+#endif /* PAR */
+
+
+#if RTS_USER_SIGNALS
+
+/*
+ * Function: initUserSignals()
+ *
+ * Initialize the console handling substrate.
+ */
+extern void initUserSignals(void);
+
+/*
+ * Function: initDefaultHandlers()
+ *
+ * Install any default signal/console handlers. Currently we install a
+ * Ctrl+C handler that shuts down the RTS in an orderly manner.
+ */
+extern void initDefaultHandlers(void);
+
+/*
+ * Function: blockUserSignals()
+ *
+ * Temporarily block the delivery of further console events. Needed to
+ * avoid race conditions when GCing the queue of outstanding handlers or
+ * when emptying the queue by running the handlers.
+ * 
+ */
+extern void blockUserSignals(void);
+
+/*
+ * Function: unblockUserSignals()
+ *
+ * The inverse of blockUserSignals(); re-enable the deliver of console events.
+ */
+extern void unblockUserSignals(void);
+
+/*
+ * Function: awaitUserSignals()
+ *
+ * Wait for the next console event. Currently a NOP (returns immediately.)
+ */
+extern void awaitUserSignals(void);
+
+/*
+ * Function: markSignalHandlers()
+ *
+ * Evacuate the handler queue. _Assumes_ that console event delivery
+ * has already been blocked.
+ */
+extern void markSignalHandlers (evac_fn evac);
+
+#endif /* RTS_USER_SIGNALS */
+
+#endif /* RTS_SIGNALS_H */