unsafePerformIO and unsafeInterleaveIO

[Marcin 'Qrczak' Kowalczyk]

Should these functions be available through the standard FFI?
IMHO they should.

Their functionality on a variety of concrete types can be archieved
by using C, in an ugly and inefficient way. FFI already contains the
level of unsafety they are at.

They are useful, especially in the context of FFI. They are used all
over hslibs: Concurrent, SocketPrim, Posix, MatchPS, XmlParse, Memo,
Readline, Select, QuickCheckBatch, Unique. I used them in 5 out of 8
bindings to random C libraries (Bzip2, Curses, Libgr, Readline, Zlib).

They are available in all four Haskell implementations, only through
different modules.

-- 
 __("<  Marcin Kowalczyk * qrczak at knm.org.pl http://qrczak.ids.net.pl/
 \__/
  ^^                      SYGNATURA ZASTÊPCZA
QRCZAK