I did not expect that its share of CPU usage in my app is 12.15%:
Why does it iterate over some collection? Isn’t there only one sender in a thread?
(more…)Building QT 6.3.1 with OpenSSL for Windows
After various experimentation I was able to build QT 6.3.1 with OpenSSL for Windows with the following steps:
Extract archives with Bash:
tar -xzf ../distrib/openssl-1.1.1q.tar.gz
tar -xf ../distrib/qt-everywhere-src-6.3.1.tar.xz
Building OpenSSL 1.1.1q
Run the following commands with x64 Native Tools Command Prompt for VS 2022:
set PATH=%PATH%;C:\dev\PFiles\Strawberry\perl\bin
set PATH=%PATH%;C:\dev\PFiles\nasm-2.15.05
perl Configure VC-WIN64A
Experimentation with OpenSSL and QT configuration on Windows
Building OpenSSL 1.1.1q with custom installation directory
Run the following commands with x64 Native Tools Command Prompt for VS 2022:
set PATH=%PATH%;C:\dev\PFiles\Strawberry\perl\bin
set PATH=%PATH%;C:\dev\PFiles\nasm-2.15.05
set MY_INSTALL_DIR=C:/dev/libs/OpenSSL
perl Configure VC-WIN64A --prefix="%MY_INSTALL_DIR%" --openssldir="%MY_INSTALL_DIR%"
Mining NEOXA on HiveOS with 3GB cards
The key to the success in mining NEOXA on HiveOS is knowing pool parameters that can be stratum+tcp://minenice.newpool.pw:1120, for example:
Handling messages from Binance Websocket streams
User Data Stream
To subscribe I query listen key:
POST /api/v3/userDataStream
connect to websocket wss://stream.binance.com:9443/stream and send the listen key with the following message :
{
"id": 1,
"method": "SUBSCRIBE",
"params": [
"<my listen key>"
]
}
When Binance accepts the subscription it sends:
{
"id": 1,
"result": null
}
Using std::future as a coroutine in C++20
In C++20 it is possible to do this:
std::future<int> compute(as_coroutine) {
int a = co_await std::async([] { return 6; });
int b = co_await std::async([] { return 7; });
co_return a * b;
}
std::future<void> fail(as_coroutine) {
throw std::runtime_error("bleah");
co_return;
}
int main() {
std::cout << compute({}).get() << '\n';
try {
fail({}).get();
} catch (const std::runtime_error &e) {
std::cout << "error: " << e.what() << '\n';
}
}
Switching to a different thread with async/await in C#
The code below switches to a different thread when the execution of Main() is resumed at line 11:
internal class Program
{
static async Task Main(string[] args)
{
try
{
HttpClient client = new HttpClient();
Console.WriteLine($"Thread: {Thread.CurrentThread.ManagedThreadId}");
HttpResponseMessage response = await client.GetAsync("https://developernote.com/");
Console.WriteLine($"Thread: {Thread.CurrentThread.ManagedThreadId}");
response.EnsureSuccessStatusCode();
string responseBody = await response.Content.ReadAsStringAsync();
Console.WriteLine($"Thread: {Thread.CurrentThread.ManagedThreadId}");
Console.WriteLine(responseBody);
}
catch (HttpRequestException e)
{
Console.WriteLine("\nException Caught!");
Console.WriteLine($"Thread: {Thread.CurrentThread.ManagedThreadId}");
Console.WriteLine($"Message: {e.Message}");
}
}
}
Testing Binance API with Postman
Clone the repository with Postman Collections and Environments:
git clone https://github.com/binance/binance-api-postman.git
Open the root repository folder:
Building QT 6.3.0 for Android on Windows with C++20
An example of how it can be configured:
set "CMAKE_ROOT=E:\PFiles\cmake-3.21.3-windows-x86_64\bin"
set "NINJA_ROOT=E:\PFiles\ninja-win"
set "JDK_ROOT=C:\Program Files\Java\jdk1.8.0_301\bin"
set "MINGW_ROOT=E:\PFiles\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\mingw64\bin"
set "PERL_ROOT=E:\PFiles\Strawberry\perl\bin"
set PATH=C:\WINDOWS\system32;C:\WINDOWS
set PATH=%CMAKE_ROOT%;%PATH%
set PATH=%NINJA_ROOT%;%PATH%
set PATH=%JDK_ROOT%;%PATH%
set PATH=%MINGW_ROOT%;%PATH%
set PATH=%PERL_ROOT%;%PATH%
set PATH=E:\PFiles\Python35;%PATH%
rem Check if the tools are in PATH
where gcc
where mingw32-make.exe
where perl.exe
where javac.exe
where python.exe
where cmake.exe
where ninja.exe
set "ANDROID_SDK_ROOT=C:\Users\D-Ef\AppData\Local\Android\Sdk"
set "ANDROID_NDK_PATH=C:\Users\D-Ef\AppData\Local\Android\Sdk\ndk\24.0.8215888"
set "ANDROID_BUILD_TOOLS_REVISION=31.0.0"
set "ANDROID_BUILD_ABI=x86_64"
rem set "ANDROID_BUILD_ABI=x86"
rem set "ANDROID_BUILD_ABI=arm64-v8a"
rem set "ANDROID_BUILD_ABI=armeabi-v7a"
set MY_INSTALL_PATH=E:/Qt/Qt6.3.0/android.%ANDROID_BUILD_ABI%
set QT_HOST_PATH=E:/Qt/Qt6.3.0/windows
configure.bat -platform win32-msvc -xplatform android-clang -prefix %MY_INSTALL_PATH% -qt-host-path %QT_HOST_PATH% ^
-c++std c++20 -no-openssl ^
-DQT_NO_EXCEPTIONS=1 -release -force-debug-info -opensource -confirm-license ^
-android-sdk %ANDROID_SDK_ROOT% -android-ndk %ANDROID_NDK_PATH% -android-ndk-platform android-23 -android-abis %ANDROID_BUILD_ABI% ^
-skip qt3d -skip qt5compat -skip qtactiveqt -skip qtcharts -skip qtcoap -skip qtconnectivity ^
-skip qtdatavis3d -skip qtdoc -skip qtlottie -skip qtmqtt -skip qtnetworkauth -skip qtopcua ^
-skip qtserialport -skip qtpositioning -skip qtquicktimeline -skip qtquick3d -skip qtremoteobjects ^
-skip qtscxml -skip qtsensors -skip qtserialbus -skip qtvirtualkeyboard -skip qtwayland ^
-skip qtwebchannel -skip qtwebengine -skip qtwebview
