#4391: forkIO threads do not properly save/restore the floating point
environment
---------------------------------+------------------------------------------
Reporter: draconx | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 7.2.1
Component: Runtime System | Version: 6.12.3
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: x86_64 (amd64) | Failure: None/Unknown
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Comment(by draconx):
The thing is, it _does_ affect "ordinary" floating point operations.
Ordinary floating point operations can raise exceptions, which will then
leak
to other threads. Similarly, ordinary floating point operations depend on
the
rounding mode, which is leaked from other threads.
For example, if any unbound thread anywhere in the program does something
innocuous like a single floating point addition, then any attempt to
handle
exceptions elsewhere in the program is subject to races with that unbound
thread.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4391#comment:5>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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