and/c, and between/c (which implies <=/c and >=/c) so that they turn
themselves into integer-in when appropriate
for example, (contract-stronger? (integer-in 0 4) (and/c natural? (<=/c 4)))
returns #t
* byte-regexp? values should not be considered 3D syntax.
* hash? values are now allowed in serialized syntax properties with (template … #:properties (…))
* marshalling properties which were prefab structs called map on the result of struct->vector, changed it to struct->list as the struct "name" is always serializable.
Specifically, when it sees these contracts:
(and/c real? negative?)
(and/c real? positive?)
(and/c real? (not/c positive?))
(and/c real? (not/c negative?))
it generates the corresponding use of >=/c, <=/c, </c, or >/c, but
those contracts have also been adjusted to report their names as
(and/c real? ...).
This mostly is an improvement for contract-stronger, but also make it
so that (between/c -inf.0 +inf.0) just uses the real? predicate
directly, instead of a more complex function
Although "macOS" is the correct name for Apple's current desktop OS,
we've decided to go with "Mac OS" to cover all of Apple's Unix-like
desktop OS versions. The label "Mac OS" is more readable, clear in
context (i.e., unlikely to be confused with the Mac OSes that
proceeded Mac OS X), and as likely to match Apple's future OS names
as anything.
If an OS-level thread other than a Racket thread logs a message, then
the message needs to be queued instead of handled immediately.
If multiple places are running, then the right handler thread is not
clear, so just queue to the main place's thread.
Closesracket/gui#66Closesracket/drracket#77
Implement POSIX.1-2001/pax and GNU extensions for long paths and links
in `untar` and `tar`. Add a `#:format` argument to `tar` to select
among POSIX.1-2001/pax, GNU, or error encoding for long paths.
it doesn't apply it the second time (since we know that the
only difference for indy blame is in the negative position
and we know that flat contracts never assign negative blame)
This commit combined with the two previous (2b9d855 and 003e8c7) do
not seem to have a significant effect on the performance of ->i
contract checking. In particular, I see a 50% slowdown between the
version before and the version after these commits on the third `time`
expression below, but no significant difference on the first two.
(without the improvement to flat-contract?, these commits are
a significant slowdown to `g`)
#lang racket
(require profile)
(define f
(contract (->i ([y () integer?]
[x (y) integer?])
(values [a () integer?]
[b (a) integer?]))
values
'pos 'neg))
(define g
(contract (->i ([y () (<=/c 10)]
[x (y) (>=/c y)])
(values [a () (<=/c 10)]
[b (a) (>=/c a)]))
values
'pos 'neg))
(define (slow-predicate n)
(cond
[(zero? n) #t]
[else (slow-predicate (- n 1))]))
(define h
(contract (->i ([y () slow-predicate]
[x (y) slow-predicate])
(values [a () slow-predicate]
[b (a) slow-predicate]))
values
'pos 'neg))
(time
(for ([x (in-range 100000)])
(f 1 2) (f 1 2) (f 1 2)
(f 1 2) (f 1 2) (f 1 2)
(f 1 2) (f 1 2) (f 1 2)))
(time
(for ([x (in-range 100000)])
(g 1 2) (g 1 2) (g 1 2)
(g 1 2) (g 1 2) (g 1 2)
(g 1 2) (g 1 2) (g 1 2)))
(time
(for ([x (in-range 10000)])
(h 50000 50000)))
The continuation of a future being evaluated concurrently was not
correctly attributed to the future's custodian (as inherited from
from the creating thread).
This adds #:eager as an option for controlling this behavior.
Using `#:eager 10` is a 2x improvement in performance for configuration 010001
of the suffixtree benchmark from Takikawa et al, POPL 2016.
The default behavior is unchanged. This is configurable because some
programs are much faster when eager checking is performed. For example:
(require racket/contract)
(collect-garbage)
(time (for/sum ([_ 100000])
(vector-ref (contract (vectorof integer? #:eager #t) #(1) 'pos 'neg)
0)))
(collect-garbage)
(time (for/sum ([_ 100000])
(vector-ref (contract (vectorof integer? #:eager #f) #(1) 'pos 'neg)
0)))
The second loop is 3-4 times slower than the first. However, making
the vector much larger will make the difference go the other way.
