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Viewing file:     index.js (1.6 KB)      -rw-r--r--

var processFinder = require('./lib/process_finder'),
    ProcessFamily = require('./lib/process_family');

var MILS_IN_SECOND = 1000,
    MAX_PRIORITY = -20;

function createProcessFamily(options, callback) {
    processFinder.find(options, function(err, parentProcess) {
        if(err) {
            return callback(err);
        }

        var processFamily = new ProcessFamily(parentProcess, options.includeChildren);
        callback(null, processFamily);
    });
}

function limit(processFamily, options, callback) {
    var running = true,
        runningTime = MILS_IN_SECOND * (options.limit / 100),
        idleTime = MILS_IN_SECOND - runningTime,
        timeoutId = setTimeout(next, runningTime),
        parentProcess = processFamily.parentProcess;

    if(!parentProcess.kill(0)) {
        return stop(new Error('Process does not exist.'));
    }

    parentProcess.on('error', function (err) {
        stop(err);
    });

    parentProcess.on('exit', function(code, signal) {
        stop();
    });

    function next() {
        processFamily.refresh(function() {
            var timeout = null;

            if(processFamily.kill(running ? 'SIGSTOP' : 'SIGCONT')) {
                timeout = running ? idleTime : runningTime;
            }

            if(timeout !== null) {
                running = !running;
                timeoutId = setTimeout(next, timeout);
            }
            else {
                stop();
            }
        });
    }

    function stop(err) {
        clearTimeout(timeoutId);
        callback(err);
    }
}

exports.createProcessFamily = createProcessFamily;
exports.limit = limit;