joycemaferko

/**
 * @file
 *
 * @ingroup POSIXAPI
 *
 * @brief Waiting on a Condition
 */

/* 
* Copyright (C) 2021 Matthew Joyce

djfdyuruiry

Enable systemd in WSL 2

NOTE: If you have Windows 11 there is now an official way to do this in WSL 2, use it if possible - see MS post here (WINDOWS 11 ONLY)

This guide will enable systemd to run as normal under WSL 2. This will enable services like microk8s, docker and many more to just work during a WSL session. Note: this was tested on Windows 10 Build 2004, running Ubuntu 20.04 LTS in WSL 2.

• To enable systemd under WSL we require a tool called systemd-genie

• Copy the contents of install-sg.sh to a new file /tmp/install-sg.sh:

ithmz

// Get texture location in fragment shader
GLint locTexY = glGetUniformLocation(program, "textureY");
GLint locTexVU = glGetUniformLocation(program, "textureVU");

// Upload YUV data to texture buffer
GLuint textureID[2];

glGenTextures(1, &textureID[0]);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, textureID[0]);

ithmz

#version 330 core
out vec4 FragColor;
in vec2 texCoord;
uniform sampler2D textureY;
uniform sampler2D textureVU;
void main() 
{
    vec3 yuv, rgb;
    vec3 yuv2r = vec3(1.164, 0.0, 1.596);
    vec3 yuv2g = vec3(1.164, -0.391, -0.813);

y0ngb1n

Docker Hub 镜像加速器

国内从 Docker Hub 拉取镜像有时会遇到困难，此时可以配置镜像加速器。

Dockerized 实践 https://github.com/y0ngb1n/dockerized

1️⃣ Docker daemon 配置代理（推荐）

参考 Docker daemon 配置代理

KyonLi

#!/bin/sh

ENABLED=yes
PROCS=v2ray
ARGS="-config /opt/etc/v2ray/config.pb -format=pb"
PREARGS=""
DESC=$PROCS
PATH=/opt/sbin:/opt/bin:/opt/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

SRC_BYPASS_IP_FILE=/opt/etc/v2ray/src_bypass_ip.txt

KireinaHoro

#!/bin/bash
# script that creates clang/llvm cross toolchain for aarch64 android target
# compile a hello world program that runs on AOSP Android:
# test with: adb push hello /data/cache && adb shell /data/cache/hello
# GCC:
# C: aarch64-linux-android-gcc hello.c -o hello -pie
# C++: aarch64-linux-android-g++ hello.cc -o hello -pie -fPIC -static-libgcc \
# -nostdlib -L/usr/local/aarch64-linux-android/lib -lc++ -lc -nostdinc++ \
# -I/usr/local/aarch64-linux-android/include/c++/v1 -std=c++11
# Clang/LLVM:

shafik

What is the Strict Aliasing Rule and Why do we care?

(OR Type Punning, Undefined Behavior and Alignment, Oh My!)

What is strict aliasing? First we will describe what is aliasing and then we can learn what being strict about it means.

In C and C++ aliasing has to do with what expression types we are allowed to access stored values through. In both C and C++ the standard specifies which expression types are allowed to alias which types. The compiler and optimizer are allowed to assume we follow the aliasing rules strictly, hence the term strict aliasing rule. If we attempt to access a value using a type not allowed it is classified as undefined behavior(UB). Once we have undefined behavior all bets are off, the results of our program are no longer reliable.

Unfortunately with strict aliasing violations, we will often obtain the results we expect, leaving the possibility the a future version of a compiler with a new optimization will break code we th

crearo

/** A fragment shader to convert NV12 to RGB.
  * Input textures Y - is a block of size w*h. 
  * texture UV is of size w*h/2. 
  * Remember, both U and V are individually of size w/2*h/2, but they are interleaved.
  * The layout looks like this :
  * ----------
  * |        |
  * |   Y    | size = w*h
  * |        |
  * |________|

tenmyo

// c - __attribute__((constructor)) equivalent in VC? - Stack Overflow
// http://stackoverflow.com/questions/1113409/attribute-constructor-equivalent-in-vc/2390626#2390626
// Rev.5

    // Initializer/finalizer sample for MSVC and GCC/Clang.
    // 2010-2016 Joe Lowe. Released into the public domain.
#include <stdio.h>
#include <stdlib.h>

#ifdef __cplusplus