Jason Fager jfager
jfager
/ LexiSortable.java
Created
July 26, 2010 16:12
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| public class LexiSortable { | |
| // Lookup table to find hex digits from bytes. | |
| private final static char[] HEX_DIGITS = { | |
| '0', '1', '2', '3', '4', '5', '6', '7', | |
| '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' | |
| }; | |
| // Lookup table to find bytes from hex digits. | |
| private final static byte[] BYTE_LOOKUP = new byte['F' + 1]; |
jfager
/ LexiSortable.java
Created
July 26, 2010 18:17
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| public static String toLexiSortable(final double d) { | |
| long tmp = Double.doubleToRawLongBits(d); | |
| return toHexString('d', (tmp < 0) ? ~tmp : (tmp ^ SIGN_MASK)); | |
| } | |
| public static double doubleFromLexiSortable(final String s) { | |
| if (!s.startsWith("d")) { | |
| throw new IllegalArgumentException(s | |
| + " does not represent a double"); | |
| } |
jfager
/ LexiSortable.java
Created
July 26, 2010 18:29
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| import java.util.Arrays; | |
| import java.util.Random; | |
| public class LexiSortable { | |
| // Converting to hex is fast and easy | |
| private final static char[] HEX_DIGITS = { | |
| '0', '1', '2', '3', '4', '5', '6', '7', | |
| '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' | |
| }; |
jfager
/ ContentionWatcher.groovy
Created
August 4, 2010 18:21
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| package org.jdiscript | |
| import org.jdiscript.handlers.* | |
| import org.jdiscript.util.VMSocketAttacher | |
| import com.sun.jdi.* | |
| VirtualMachine vm = new VMSocketAttacher(12345).attach() | |
| JDIScript j = new JDIScript(vm) | |
| j.monitorContendedEnterRequest({ |
jfager
/ gist:912588
Created
April 10, 2011 18:25
Full precision summation based on http://code.activestate.com/recipes/393090/
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| -- Full precision summation based on http://code.activestate.com/recipes/393090/ | |
| msum :: [Double] -> Double | |
| msum [] = 0 | |
| msum (x:xs) = sum $ foldl' (\ps x' -> reverse (partials x' ps)) [x] xs | |
| partials :: Double -> [Double] -> [Double] | |
| partials x = foldl' (\acc p -> case hilo x p of (hi, 0) -> hi:acc | |
| (hi, lo) -> hi:lo:acc) [] | |
| hilo :: Double -> Double -> (Double, Double) |
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| alias sha1='openssl dgst -sha1' | |
| SHARED_BASH_REMOTE=~/path/to/dropbox/shared_bash.sh | |
| SHARED_BASH_TMP=~/.bash_shared.sh.tmp | |
| SHARED_BASH_LOCAL=~/.bash_shared.sh | |
| if [ -f $SHARED_BASH_REMOTE ]; then | |
| cp $SHARED_BASH_REMOTE $SHARED_BASH_TMP | |
| if [ -f $SHARED_BASH_LOCAL ]; then | |
| SHARED_LOCAL_SHA=`sha1 $SHARED_BASH_LOCAL | cut -f2 -d=` | |
| SHARED_TMP_SHA=`sha1 $SHARED_BASH_TMP | cut -f2 -d=` |
jfager
/ simple_server.rs
Last active
December 18, 2015 09:59
Writing a websocket server in Rust, ran into an issue where the server would hang after a few connection attempts. Here's a minimal client/server; in the server, if you uncomment the separate spawned task on the default scheduler, the hang always happens. Putting that other task on its own thread makes everything work fine.
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| extern mod extra; | |
| use std::{int,io,result}; | |
| use extra::{net,net_tcp,uv}; | |
| fn main() { | |
| let (accept_port, accept_chan) = stream(); | |
| let (finish_port, finish_chan) = stream(); | |
| let addr = extra::net_ip::v4::parse_addr("127.0.0.1"); |
jfager
/ segfaulting_server.rs
Last active
December 18, 2015 13:09
Run segfaulting_server with 'rustc segfaulting_server.rs && export RUST_LOG=extra::net_tcp=debug && ./segfaulting_server', then run the client. The server will segfault after the 3rd client request. If you comment out lines 43 & 44, everything works great.
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| extern mod extra; | |
| use std::{int,io,result,task}; | |
| use extra::{net,net_tcp,uv}; | |
| fn server(outer_ch: Chan<Chan<~str>>) { | |
| let (accept_port, accept_chan) = stream(); | |
| let (finish_port, finish_chan) = stream(); | |
| let addr = extra::net_ip::v4::parse_addr("127.0.0.1"); |
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| #include<stdio.h> | |
| main() { | |
| long long a = -9223372036854775808; | |
| long long b = a * -1; | |
| printf("%lld\n", b); | |
| } |
jfager
/ ip6_to_str.rs
Created
June 25, 2013 10:50
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| fn ip6_to_str(ip6: &[u8]) -> ~str { | |
| let f = u8::to_str_radix; | |
| return fmt!("%s%s:%s%s:%s%s:%s%s:%s%s:%s%s:%s%s:%s%s", | |
| f(ip6[ 0], 16), f(ip6[ 1], 16), | |
| f(ip6[ 2], 16), f(ip6[ 3], 16), | |
| f(ip6[ 4], 16), f(ip6[ 5], 16), | |
| f(ip6[ 6], 16), f(ip6[ 7], 16), | |
| f(ip6[ 8], 16), f(ip6[ 9], 16), | |
| f(ip6[10], 16), f(ip6[11], 16), | |
| f(ip6[12], 16), f(ip6[13], 16), |
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