keithwhor / multithread.js Goto Github PK

It would be great if this library could support transferable objects for high performance cases where it would be bad to serialize a huge typed array as JSON for example.

A few questions about the library if you don't mind:

• how is the data transferred to the threads: is it copied or transferred by transfer-by-ownership?
• any way to easily include external functions, external libraries, global constants to each thread?
• any way to terminate threads prematurely (allowing user to cancel pending computation)?
• any way to get progress messages from the threads (so progress bars and other UI indicators can be shown)?
• any chance to control the threads in sync using promises. That is,
  • provide an array of, say, 30 objects that each contain the necessary data for each thread to do its calculation
  • start the maximum number of threads the client can handle (for instance start 8 threads and form a queue for 22)
  • when all threads complete, resolve a promise or reject it depending on possible raised exceptions during computation.
  • allow the before-mentioned features to be used in this synchronized batch job.

Hi, first off Ima newbie in this topic of multithreading with javascript.

Problem:

I need evaluate coords from array, so when I'm doing it the thread only takes first value of each array and dunno why.

Click here to view the image

There is a way to evaluate each value from each array?

Am I doing wrong something?

Hope help me, many thanks.

(Sorry for my english)

Code:

$.each(json, MT.process(
function (i, row) {
// Coordenadas X
var xcoor = row.xcoor;

                if (xcoor.indexOf('=') !== -1)
                    xcoor = xcoor.split("=")[1];

                xcoor = xcoor.replace("{", "").replace("}", "");
                var xcoor_array = xcoor.split(',');

                // Coordenadas Y
                var ycoor = row.ycoor;

                if (ycoor.indexOf('=') !== -1)
                    ycoor = ycoor.split("=")[1];

                ycoor = ycoor.replace("{", "").replace("}", "");
                var ycoor_array = ycoor.split(',');

                // Coordenadas Z
                var zcoor = row.zcoor;

                if (zcoor.indexOf('=') !== -1)
                    zcoor = zcoor.split("=")[1];

                zcoor = zcoor.replace("{", "").replace("}", "");
                var zcoor_array = zcoor.split(',');

                // LANTA - A
                console.log('Length:', xcoor_array.length, 'Array X:', xcoor_array);
                for (var i = 0; i < xcoor_array.length; i++) {
                    if (xcoor_array[i] != "NULL" || xcoor_array[i] != 0) {
                        if (ycoor_array[i] != "NULL" || ycoor_array[i] != 0) {
                            error = 0;
                            ispolygon = true;

                            point = {
                                x: parseFloat(xcoor_array[i] / 100),
                                y: parseFloat(ycoor_array[i] / 100),
                                z: parseFloat(zcoor_array[i] / 100),
                                equipo: row.equipo
                            };

                            return point;
                        }
                    }
                }
            },
            function (r) {
                console.log("x: ", r.x, "y: ", r.y, "inside: ", isPointInPolygon(polygon, point = {x: r.x, y: r.y}));
            }
        )
    );

Is it possible to add JQuery to synchronous threads? It would be useful to be able to access methods like $.post() or $.get() and $(data).attr();

I found this version of JQuery without DOM functions intended for web workers. Unfortunately it doesn't have the .attr() method but it does have $.post() and $.get(). https://github.com/kpozin/jquery-nodom

I don't know how to modify multithread.js to add a reference to this library and I haven't tried using Web Workers before but if it would be possible to create a fork that includes JQuery it would make multithread.js easier to use.

it broken at a error message:Uncaught SyntaxError: Unexpected identifier

I am willing to offer long term and active support for this project if that is fine with you.

I'm considering:

• Refactoring
• Offering test coverage
• Providing support for modern node versions
• Improving performance

Hi, how does this library compare to https://github.com/calvinmetcalf/catiline ?

An interesting library. Have you found a way for a thread to wait for a message while in the middle of a function? Rather than returning from it and waiting for onmessage to be called?

Without that, it seems like the operations that currently must be asynchronous, such as AJAX calls, pretty much still must be, which eliminates a lot of the benefit.

Of course even if it were available we'd still be doing a lot of inefficient JSON-ification just to escape that...

Is there a way to pass a variable by reference allowing multiple threads to asynchronously modify a variable during runtime?

@keithwhor Never seen this kind of syntax before:

https://github.com/keithwhor/multithread.js/blob/master/multithread.js#L26

What does the /**/ mean in an variable declaration?

I want to terminate the worker if the the worker is not needed any more

	var script = this._worker[type]
		.toString()
		.replace(/^.*?[\n\r]+/gi, '')
		.replace(/\}[\s]*$/, '')
		.replace(/\/\*\*\/name\/\*\*\//gi, name)
		.replace(/\/\*\*\/func\/\*\*\//gi, fnStr);

Can not replace the name and fnStr ?