[Haskell-cafe] Re: syscall, sigpause and EINTR on Mac OSX
bulatz at HotPOP.com
Mon Dec 12 05:50:22 EST 2005
Sunday, December 11, 2005, 9:43:08 PM, you wrote:
BM> After seeing this only I can tell that for example in C++ one can't cout
BM> clog cerr
BM> or post some event via synchronized event queue or condition variable
BM> from signal handler.
BM> All of that would result in ghosts and goblins in program.
it is not the case for Haskell. at least, the following handler works
very well in GHC 6.4/windows:
handleCtrlBreak handler action = do
myThread <- myThreadId
let onBreak event = do
putStr " ^Break!"
programTerminated =: True
bracket (installHandler$ Catch onBreak) (installHandler) $ \oldHandler -> do
>>This way I know what the signal was that triggered the handler and I can
>>tell that it was triggered. The deadlock is somewhere else because the
>>handler is not being tripped.
but in 6.4.1 (ATTENTION, JOEL!) this code was breaked. i does an
investigation and found that in 6.4.1 with -threaded ^Break hadnling
works only in main program thread! i complained several days ago in
ghc-bugs list. you, Joel, can get example i posted there, replace
windows-specific ^Break handling with Unix one and test it
Bulat mailto:bulatz at HotPOP.com
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