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AsyncBlockOperation is very similar to NSBlockOperation with one caveat; the block you pass to it receives one argument, a reference to the AsyncBlockOperation for the block. When your block is done with its task, it must call [op complete]
Example usage:
NSOperation* asyncOp = [AsyncBlockOperation blockOperationWithBlock:^(AsyncBlockOperation* op) {
NSLog(@"starting op");
double delayInSeconds = 2.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
@gka
gka / sqlite3-example.py
Last active June 4, 2023 01:32
The code below does the same as the example snippet you've just seen: opening a database connection, creating a new table with some columns, storing some data, altering the table schema and adding another row.
import sqlite3
# open connection and get a cursor
conn = sqlite3.connect(':memory:')
c = conn.cursor()
# create schema for a new table
c.execute('CREATE TABLE IF NOT EXISTS sometable (name, age INTEGER)')
conn.commit()
@tvon
tvon / moby.sh
Last active December 15, 2015 07:39
Concatenate header files from frameworks in the iOS 6.1 SDK, as described in Mark Dalrymple's talk on headers.
#!/bin/bash
OUTDIR=~/Desktop/moby
BASE="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk/System/Library/Frameworks"
mkdir -p ${OUTDIR}
cd ${BASE}
for dir in *
do
@mattt
mattt / uiappearance-selector.md
Last active October 7, 2025 13:32
A list of methods and properties conforming to `UIAppearance` as of iOS 12 Beta 3

Generate the list yourself:

$ cd /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS*.sdk/System/Library/Frameworks/UIKit.framework/Headers
$ grep UI_APPEARANCE_SELECTOR ./*     | \
  sed 's/NS_AVAILABLE_IOS(.*)//g'     | \
  sed 's/NS_DEPRECATED_IOS(.*)//g'    | \
  sed 's/API_AVAILABLE(.*)//g'        | \
  sed 's/API_UNAVAILABLE(.*)//g'      | \
 sed 's/UI_APPEARANCE_SELECTOR//g' | \
@mywaiting
mywaiting / graceful_shutdown_tornado_web_server.py
Last active May 7, 2022 08:30
The example to how to shutdown tornado web server gracefully...
#!/usr/bin/env python
"""
How to use it:
1. Just `kill -2 PROCESS_ID` or `kill -15 PROCESS_ID` , The Tornado Web Server Will shutdown after process all the request.
2. When you run it behind Nginx, it can graceful reboot your production server.
3. Nice Print in http://weibo.com/1682780325/zgkb7g8k7
"""
@hannu
hannu / gist:4604611
Last active August 30, 2022 08:31
Filter your own commit messages from git log and group by day. (Modified from http://stackoverflow.com/questions/2976665/git-changelog-day-by-day)
#!/bin/bash
AUTHOR=$(git config user.name)
DATE=$(date +%F)
git log --no-merges --format="%cd" --date=short --no-merges --author="$AUTHOR" --all | sort -u -r | while read DATE ; do
if [ $NEXT != "" ]
then
echo
echo [$NEXT]
fi
GIT_PAGER=cat git log --no-merges --format=" %s" --since=$DATE --until=$NEXT --author="$AUTHOR" --all
@ndarville
ndarville / business-models.md
Last active October 9, 2025 17:55
Business models based on the compiled list at http://news.ycombinator.com/item?id=4924647. I find the link very hard to browse, so I made a simple version in Markdown instead.

Business Models

Advertising

Models Examples
Display ads Yahoo!
Search ads Google
@mnicky
mnicky / clojure-blip-videos-orig-urls.txt
Created December 14, 2012 11:30
Direct links to Clojure videos on Blip TV
http://blip.tv/file/get/Richhickey-ClojureDataStructuresPart1411.flv
http://blip.tv/file/get/Richhickey-ClojureDataStructuresPart2306.flv
http://blip.tv/file/get/Richhickey-ClojureSequences733.flv
http://blip.tv/file/get/Richhickey-ClojureConcurrency252.flv
http://blip.tv/file/get/Richhickey-ClojureForJavaProgrammers2Of2680.mov
http://blip.tv/file/get/Richhickey-ClojureForJavaProgrammers1Of2174.flv
http://blip.tv/file/get/Richhickey-ClojureForLispProgrammersPart2299.mov
http://blip.tv/file/get/Richhickey-ClojureForLispProgrammersPart1372.flv
http://blip.tv/file/get/Richhickey-HammockdrivenDevelopment465.mov
http://blip.tv/file/get/Richhickey-MichaelFogusFertileGroundTheRootsOfClojure492.mov
@klange
klange / _.md
Last active December 23, 2024 14:40
It's a résumé, as a readable and compilable C source file. Since Hacker News got here, this has been updated to be most of my actual résumé. This isn't a serious document, just a concept to annoy people who talk about recruiting and the formats they accept résumés in. It's also relatively representative of my coding style.

Since this is on Hacker News and reddit...

  • No, I don't distribute my résumé like this. A friend of mine made a joke about me being the kind of person who would do this, so I did (the link on that page was added later). My actual résumé is a good bit crazier.
  • I apologize for the use of _t in my types. I spend a lot of time at a level where I can do that; "reserved for system libraries? I am the system libraries".
  • Since people kept complaining, I've fixed the assignments of string literals to non-const char *s.
  • My use of type * name, however, is entirely intentional.
  • If you're using an older compiler, you might have trouble with the anonymous unions and the designated initializers - I think gcc 4.4 requires some extra braces to get them working together. Anything reasonably recent should work fine. Clang and gcc (newer than 4.4, at le
@dfm
dfm / LICENSE
Last active August 16, 2025 16:42
XKCD-style plots in d3
Copyright (c) 2012–2013 Daniel Foreman-Mackey
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all