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@steipete
steipete / PSPDFUIKitMainThreadGuard.m
Last active May 27, 2024 12:11
This is a guard that tracks down UIKit access on threads other than main. This snippet is taken from the commercial iOS PDF framework http://pspdfkit.com, but relicensed under MIT. Works because a lot of calls internally call setNeedsDisplay or setNeedsLayout. Won't catch everything, but it's very lightweight and usually does the job.You might n…
// Taken from the commercial iOS PDF framework http://pspdfkit.com.
// Copyright (c) 2014 Peter Steinberger, PSPDFKit GmbH. All rights reserved.
// Licensed under MIT (http://opensource.org/licenses/MIT)
//
// You should only use this in debug builds. It doesn't use private API, but I wouldn't ship it.
// PLEASE DUPE rdar://27192338 (https://openradar.appspot.com/27192338) if you would like to see this in UIKit.
#import <objc/runtime.h>
#import <objc/message.h>
@apaprocki
apaprocki / issue5564.cc
Last active December 17, 2015 20:59
Using libuv to create a loop which uses `UV_RUN_ONCE` to handle either a single timer firing or async send. If the timeout for the timer is 0ms, only one `UV_RUN_ONCE` is needed, but if the timeout is > 0ms, a second `UV_RUN_ONCE` call is needed or the timer callback does not fire.
// Compiling from toplevel of built node.js repo on OSX:
// CC -g -o issue5564 issue5564.cc -I deps/uv/include/ \
// -L out/Debug/ -luv -framework CoreFoundation -framework Carbon
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include "uv.h"
@roxlu
roxlu / X264Encoder.cpp
Created June 26, 2013 21:01
X264 encoder example
#include <roxlu/core/Log.h>
#include <roxlu/core/Utils.h>
#include <video/X264Encoder.h>
X264Encoder::X264Encoder()
:in_width(0)
,in_height(0)
,in_pixel_format(AV_PIX_FMT_NONE)
,out_width(0)
,out_height(0)
@enjalot
enjalot / Draggable.coffee
Created August 6, 2013 23:54
drag and drop in derby (by @ishbu)
helpers = require('../util').helpers
module.exports = Draggable = (e, containerEl, handle, dragSelector, handleSelector, component, @moveCallback, startX, startY) ->
items = containerEl.querySelectorAll dragSelector
if dragSelector == handleSelector
el = handle
else
handles = containerEl.querySelectorAll handleSelector
index = nodeIndex handles, handle
el = items[index]
@ccgus
ccgus / gist:6324222
Created August 23, 2013 21:28
Custom SQLite Functions
[db makeFunctionNamed:@"UTTypeConformsTo" maximumArguments:2 withBlock:^(sqlite3_context *context, int argc, sqlite3_value **argv) {
if (sqlite3_value_type(argv[0]) == SQLITE_TEXT) {
const unsigned char *a = sqlite3_value_text(argv[0]);
const unsigned char *b = sqlite3_value_text(argv[1]);
CFStringRef as = CFStringCreateWithCString(nil, (const char*)a, kCFStringEncodingUTF8);
CFStringRef bs = CFStringCreateWithCString(nil, (const char*)b, kCFStringEncodingUTF8);
sqlite3_result_int(context, UTTypeConformsTo(as, bs));
@halgari
halgari / gist:7160778
Created October 25, 2013 19:47
Using core.logic to query custom data sources.
(ns extend-core-logic.core
(:require [clojure.core.logic :refer :all]
[clojure.core.logic.protocols :refer [walk]]
[clojure.java.io :as jio]
[clojure.string :as string])
(:import [java.io BufferedReader StringReader]))
;; from: http://federalgovernmentzipcodes.us/
(defn load-db []
(let [data (java.io.BufferedReader. (java.io.StringReader. (slurp "/Users/tim/Downloads/free-zipcode-database.csv")))
@chanks
chanks / gist:7585810
Last active January 10, 2025 03:03
Turning PostgreSQL into a queue serving 10,000 jobs per second

Turning PostgreSQL into a queue serving 10,000 jobs per second

RDBMS-based job queues have been criticized recently for being unable to handle heavy loads. And they deserve it, to some extent, because the queries used to safely lock a job have been pretty hairy. SELECT FOR UPDATE followed by an UPDATE works fine at first, but then you add more workers, and each is trying to SELECT FOR UPDATE the same row (and maybe throwing NOWAIT in there, then catching the errors and retrying), and things slow down.

On top of that, they have to actually update the row to mark it as locked, so the rest of your workers are sitting there waiting while one of them propagates its lock to disk (and the disks of however many servers you're replicating to). QueueClassic got some mileage out of the novel idea of randomly picking a row near the front of the queue to lock, but I can't still seem to get more than an an extra few hundred jobs per second out of it under heavy load.

So, many developers have started going straight t

@ivochkin
ivochkin / CMakeLists.txt
Created December 16, 2013 19:40
Example of integrating capnproto library into existing cmake project that already uses gmock as external project.
include(ExternalProject)
ExternalProject_Add(gmock
SVN_REPOSITORY http://googlemock.googlecode.com/svn/tags/release-1.7.0
CMAKE_ARGS -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
INSTALL_COMMAND ""
UPDATE_COMMAND ""
)
ExternalProject_Get_Property(gmock source_dir)
@ColtonProvias
ColtonProvias / fountain.py
Created January 3, 2014 04:18
Fountain parser for Python 3.
"""
fountain.py
Ported to Python 3 by Colton J. Provias - [email protected]
Based on Fountain by Nima Yousefi & John August
Original code for Objective-C at https://github.com/nyousefi/Fountain
"""
COMMON_TRANSITIONS = {'FADE OUT.', 'CUT TO BLACK.', 'FADE TO BLACK.'}
@mmitchel
mmitchel / freebsd10-gce.txt
Last active April 21, 2019 02:03
Prepare FreeBSD 10 for Google Compute Engine
I was able to install FreeBSD on GCE in a very direct way, without the hurdles of Qemu, gcutil, and the FreeBSD installer. All are great tools, but I think my apporach is somewhat more suitable for GCE, or at least much simpler. Much of this is well-known practice for installing manually, with some fluff for managing it as a disk image, as well as the few odd networking requirements of GCE (MTU and netmask).
My basic approach is to:
* Use my FreeBSD machine at home to build a self-hosting "rescue" disk image for GCE.
* Start a temporary Linux machine in GCE from a provided image.