Hello!
On Thu, Mar 16, 2000 at 04:48:02PM -0700, Alastair Reid wrote:
More through testing of my quick fix (ie trying bigger examples)
revealed that my "trap '' 26" hack failed about 1% of the time.
This being too often (approximately once per program run!)
I hacked up
On FreeBSD using ghc 4.04, long running commands executed with
System.system are being interrupted by virtual alarms leading to
errors such as:
o Fail: interrupted
Action: system
Reason: system command interrupted rm -f xxx yyy
o Virtual timer expired
o gcc: Internal
Hello!
On Fri, Mar 17, 2000 at 01:42:14AM -0800, Simon Marlow wrote:
[...]
After looking at ghc 4.02's libraries for a while (it's all I had
around), it looks as though ghc-4.02/ghc/lib/std/cbits/system.c should
mask the SIGVTALRM signal after executing fork and before executing
exec*.
Hello!
On Fri, Mar 17, 2000 at 01:46:03AM -0800, Simon Marlow wrote:
I don't get it - execve() and friends are supposed to reset
all the signal
handlers back to the default state, aren't they? And I can't seem to
construct an example to demonstrate the problem.
Ah, I get it finally
The correct handling would be:
- block SIGALRM/SIGVTALRM/SIGPROF
- *then* fork() (else you have a race condition where the child could
receive *and handle* the signal)
This race condition is harmless, I think. The VTALRM handler just
increments a counter, and we're about to blow away this
`/usr/local/pub-bkb/ghc/fptools/ghc/rts/gmp/mpz'
../driver/ghc-inplace -I../includes -I. -Iparallel -optc-Wall
-optc-W -optc-Wstrict-prototypes -optc-Wmissing-prototypes
-optc-Wmissing-declarations -optc-Winline
-optc-Waggregate-return -optc-Wpointer-arith
-optc-Wbad-function-cast
Attached is a patch of what I did to my Posix.lhs. The problem is that
'getEnvVar' will throw an exception when the variable is not present in the
environment. Thus, I'm proposing 'mayGetEnvVar', which will return
Nothing | Just String. I can't think of a reason why anyone would want to use
the
Attached is a patch of what I did to my Posix.lhs. The problem is that
'getEnvVar' will throw an exception when the variable is not
present in the
environment. Thus, I'm proposing 'mayGetEnvVar', which will return
Nothing | Just String. I can't think of a reason why anyone
would want to
Dear Colleagues,
I apologize if you receive multiple copies of this message
and would be grateful if you could distribute the 2nd Summer School
Call For Participation given below
Best regards,
S. Sousa
--
Dear Colleagues,
I apologize if you receive multiple copies of this message and would
be grateful if you could distribute the 2nd Summer School
Call For Participation given below
Best regards,
S. Sousa
--
On 17-Mar-2000, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
newtype Void = Void Void deriving Show
Hugs and hbc accept it without complaining. (I haven't got nhc installed.)
nhc98 reports
Error when renaming::
Newtype Main.B is circular.
The Haskell report explicitly allows recursive newtype definitions.
So why is it reasonable for a compiler to reject them?
nhc98 rejects circular newtypes which are semantically bottom, like
newtype Void = Void Void
newtype A = A B
newtype B = B A
because it cannot find a
On 16-Mar-2000, Patrik Jansson [EMAIL PROTECTED] wrote:
On Thu, 16 Mar 2000, Chris Okasaki wrote:
newtype Foo = F Foo
...
Hugs and hbc accept it without complaining. (I haven't got nhc installed.)
What is interesting is that ghc loops when trying to compile this
definition! (Ghc folks,
Fergus Henderson [EMAIL PROTECTED] writes:
On 16-Mar-2000, Jan Brosius [EMAIL PROTECTED] wrote:
I wonder if someone could tell me more about the speed and size of compiled
Haskell code.
...
What about Haskell 98 versus (I anticipate) Haskell 2
There should be no significant
Hello
I think, using literate programming techniques could be very useful. One
could produce all of the following from the same source file(s):
1. Interface (user-level) documentation,
2. User documentation, manuals.
3. The actual Haskell source code,
4. A heavily interlinked HTML version of
Volker suggests using SGML/DSSSL for documentation. If one were to
take this route, I think XML/XSLT would be a more sensible combination.
See
http://www.cs.bell-labs.com/~wadler/xml
for a quick intro to XML. Runciman and Wallace at York have a nice
XML library for Haskell.
Hi
On Fri, 17 Mar 2000, Philip Wadler wrote:
Volker suggests using SGML/DSSSL for documentation. If one were to
take this route, I think XML/XSLT would be a more sensible combination.
Why do you think so? I see the following advantages of SGML/DSSSL over
XML/XSL:
- open source tools
newtype Void = Void Void deriving Show
Hugs and hbc accept it without complaining. (I haven't got nhc installed.)
nhc98 reports
Error when renaming::
Newtype Main.B is circular.
Newtype Main.A is circular.
Newtype Main.Void is circular.
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