If the failure-result is a procedure, it is called without arguments. I
quote part of the doc:
quote
If failure-result is a procedure, it is called (through a tail call) with
no arguments to produce the result.
endquote
Jos
-Original Message-
From: users-boun...@racket-lang.org [mailto:
If the third argument to `dict-ref' (and `hash-ref') is a function,
then the function is called as a failure thunk. If the third argument
is any other kind of value, then the value is returned as the result in
case of failure.
This is convenient but, yes, potentially confusing.
If you want a defa
So, I have a dict A that looks like (list ("string as key" . (lambda
(arg) ...) ...)
I do ((dict-ref A key (lambda (_) "wrong key")) some-params).
When keys are valid the above work as expected. When the key does not
find any, I was expecting
((lambda (_) "wrong key") some-params) but it fails w
Matthew and Ryan and Robby,
MAJOR COLLECTIONS WITHOUT ACTIVITY
The issue regarding major collections occuring with no activity was due
to the collect function executing in lru.rkt on a timer. Now no
activity equals no collections. Thanks Ryan.
BACKGROUND AND NEXT QUESTION
Purpose of fo
At Fri, 15 Feb 2013 17:52:59 +0100, herak...@gmx.de wrote:
> the maximum number for the range is internally not accepted. When I enter
> 10 in my loops textfield(see attached gui app) I get an
>
> set-value in gauge%: contract violation
> expected: (integer-in 0 1)
> given: 10001
>
At Fri, 15 Feb 2013 16:55:09 -0500 (EST), Galler wrote:
> Matthew,
>
> > A major collection is triggered when current memory use is twice
> > the use at the last major collection.
>
> I'm not following this sentence, as it implies logarithmic growth in
> memory, which is not observed.
Matthew,
A major collection is triggered when current memory use is twice
the use at the last major collection.
I'm not following this sentence, as it implies logarithmic growth in
memory, which is not observed.
At some point in the executable's life, the major GC cycles consistently
occur
Matt, Ryan
Thanks very much for the answers, let me think about.
I'm looking at the issue Ryan brings up with module references to
lru.rkt, which surprised me.
R./
Zack
On Fri, Feb 15, 2013 at 2:39 PM, Matthew Flatt wrote:
At Fri, 15 Feb 2013 14:16:38 -0500 (EST), Galler wrote:
When an app
Racket version 5.3.3 is now available from
http://racket-lang.org/
This is a bug-fix release to address a flaw in DrRacket v5.3.2
concerning interactions between the contour window and the syntax
coloring.
Feedback Welcome,
--
((lambda (x) (x x)) (lambda (x) (x x))) Eli Bar
I think the periodic two major collections are coming from the default
servlet "manager", which defaults to a manager created by
make-threshold-LRU-manager. (See the two calls to (collect-garbage) in
web-server/managers/lru.rkt).
Ryan
On 02/15/2013 02:16 PM, Galler wrote:
Dear Racketeers,
At Fri, 15 Feb 2013 14:16:38 -0500 (EST), Galler wrote:
> When an application is compiled and run, the garbage collector in v5.3.2
> appears to run through a number of minor collection cycles, then will
> execute two sequential major cycles, in rapid succession.
>
> [...]
>
> 1) Why are two suc
Dear Racketeers,
*SMALL PREAMBLE*
I'm trying to understand the observed GC behavior so I can create better
application performance, and I'm focusing on the major GC-cycle.
For usability, my desire would be to have a major-garbage-collection
cycle last about the same time as a typical request
And if you're still left wanting to find system/user specific paths,
find-system-path has you covered
(http://docs.racket-lang.org/reference/Filesystem.html).
On 15.02.13 16:07, Sam Tobin-Hochstadt wrote:
When you write something like this:
#lang racket
(require "myfile.rkt")
and r
Hello friends,
the maximum number for the range is internally not accepted. When I enter
10 in my loops textfield(see attached gui app) I get an
set-value in gauge%: contract violation
expected: (integer-in 0 1)
given: 10001
Yours,
guithread.rkt
Description: Binary data
_
When you write something like this:
#lang racket
(require "myfile.rkt")
and run that, it looks for "myfile.rkt" in the same directory that the
file you are running is in.
If you're running racket at a command line, like this:
% racket.exe "myfile.rkt"
then racket looks for "myfile.rkt"
On Feb 1 I wrote:
"I have not been able to find a succinct description how to cope with
the Windows directory system to make Racket find user-created files,
either to run them as programs or open them as data sources or
destinations. Perhaps there is a particular directory where they have to
Hi Martin: sorry about that bug. We are preparing a release to address this
problem that should be out shortly (watch this space for announcements).
In the mean time, close the contour window and the problem should go away.
Apologies,
Robby
On Fri, Feb 15, 2013 at 3:35 AM, Martin Saurer wrote:
On Fri, 15 Feb 2013, Norman Gray wrote:
On 2013 Feb 15, at 00:30, Matthew Flatt wrote:
At Thu, 14 Feb 2013 13:42:38 +, Norman Gray wrote:
[...]
What I _want_ to do here is basically execv(3) vi from a Racket program.
[...]
The `system' function uses threads as needed to pump from
non-f
Matthew, hello.
On 2013 Feb 15, at 00:30, Matthew Flatt wrote:
> At Thu, 14 Feb 2013 13:42:38 +, Norman Gray wrote:
>> (parameterize ((current-subprocess-custodian-mode #f))
>> [...])
>>
>> I get an error "current-subprocess-custodian-mode: expects argument of type
>> <'interrupt, 'kill,
Dear Racketeers
When enabled the "Open files in separate tabs ." setting,
Racket fails to open a file, with the following error message:
sequence-contract-violation: negative: method end-edit-sequence cannot be
called, except in states (in-edit-sequence)
context...:
C:\Program Files\Racket
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