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Commit 621e27f2 authored by Julian Frosch's avatar Julian Frosch
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Added some stuff for multi-threading

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README.md
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# THIS BRANCH IS ONLY FOR TESTING AND DEMONSTRATION OF MULTICORE-USE!
# BezLinApp for node.js and electron # BezLinApp for node.js and electron
This is an application written with node.js and electron that tries to do a piecewise linear approximation on Bezier curves in a given SVG-file. This is an application written with node.js and electron that tries to do a piecewise linear approximation on Bezier curves in a given SVG-file.
## How to start ## How to start
Before starting, npm is required. Before starting, npm is required.
In order to test the program, clone the repo, cd into it's directory and run In order to test the program, clone the repo, cd into it's directory and run
``` ```
npm install npm install
``` ```
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index.html
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...@@ -6,9 +6,6 @@ ...@@ -6,9 +6,6 @@
</head> </head>
<body> <body>
<h1>Hello World!</h1> <h1>Hello World!</h1>
We are using node <script>document.write(process.versions.node)</script>,
Chrome <script>document.write(process.versions.chrome)</script>,
and Electron <script>document.write(process.versions.electron)</script>.
<div id="svgHolder" class="holder"> <div id="svgHolder" class="holder">
Drag your svg-file here! Drag your svg-file here!
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js/script.js
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...@@ -7,12 +7,35 @@ $(function(){ ...@@ -7,12 +7,35 @@ $(function(){
svgHolder.ondragleave = svgHolder.ondragend = function () { svgHolder.ondragleave = svgHolder.ondragend = function () {
return false; return false;
}; };
/*
Here, we try some things with multiple processes:
*/
var fork = require('child_process').fork;
// get this machine's number of CPUs
var numCPUs = require("os").cpus().length;
console.log("Number of cores: " + numCPUs);
// create one child for every core
var children = [];
for (var i = 0; i < numCPUs; i++) {
// fork-command takes the foreign script, arguments and further options as params
children[i] = fork('./js/thread_test/thread.js', [i]);
// listen on messages from the children, print info and kill it
children[i].on('message', function(m) {
var child_id = m.c_id;
console.log("Got message from child " + child_id);
children[child_id].kill();
});
}
// When the user drops the file // When the user drops the file
svgHolder.ondrop = function (e) { svgHolder.ondrop = function (e) {
e.preventDefault(); e.preventDefault();
var file = e.dataTransfer.files[0]; var file = e.dataTransfer.files[0];
// TODO: check for filetype (maybe via regex) // TODO: check for filetype (maybe via regex)
// TODO: remove // TODO: remove
console.log('File you dragged here is', file.path); console.log('File you dragged here is', file.path);
...@@ -29,5 +52,13 @@ $(function(){ ...@@ -29,5 +52,13 @@ $(function(){
} }
}); });
/*
More cool multi-core-stuff!
Send a message to every child. Each child will send something back, which
results in the parent killing it.
*/
children.forEach(function(child) {
child.send({content: "do something!"});
});
}; };
}); });
js/thread_test/thread.js 0 → 100644
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var id = process.argv[2];
console.log("Child " + id + " started!");
process.on('message', function(m) {
// child got message
console.log("Child " + id + " got message: " + m.content);
process.send({c_id: id, content: "success"});
})
main.js
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...@@ -3,7 +3,7 @@ const app = electron.app; // Module to control application life. ...@@ -3,7 +3,7 @@ const app = electron.app; // Module to control application life.
const BrowserWindow = electron.BrowserWindow; // Module to create native browser window. const BrowserWindow = electron.BrowserWindow; // Module to create native browser window.
// Report crashes to our server. // Report crashes to our server.
electron.crashReporter.start(); //electron.crashReporter.start();
// Keep a global reference of the window object, if you don't, the window will // Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected. // be closed automatically when the JavaScript object is garbage collected.
...@@ -30,6 +30,9 @@ app.on('ready', function() { ...@@ -30,6 +30,9 @@ app.on('ready', function() {
// Open the DevTools. // Open the DevTools.
mainWindow.webContents.openDevTools(); mainWindow.webContents.openDevTools();
// example: Access arguments
console.dir(process.argv);
// Emitted when the window is closed. // Emitted when the window is closed.
mainWindow.on('closed', function() { mainWindow.on('closed', function() {
// Dereference the window object, usually you would store windows // Dereference the window object, usually you would store windows
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