spawn-limit

It is almost as same as original child_process.spawn, but it has maximum process number limit.

spawn function receives compatible arguments of child_process.spawn, but it returns a Promise object instead of process instance.

This promise is triggered when the process is actually spawned. It passes process instance to the promise callback function.

var spawn = require("spawn-limit").spawn;

var promise = spawn("ls", ["-la"], {cwd: "~"});
promise.then(function (ls) {
    ls.stdout.on("data", function (data) {
        console.log(data.toString());
    });
    ls.on("close", function (code) {
        console.log("code:", code);
    });
});

This module provides setLimit() function to set limit count of process, and `waitAll()`` for waiting all external processes's terminations.

var sl = require("spawn-limit");

sl.setLimit(10);

logFiles.map(function (logFile) {
    sl.spawn("cp", [logFile, "/var/log/archive"]);
});

API

• spawn(cmd, [args], [options) => promise

Spawn esternal process.

• setLimit(num)

Set limit count of process. Default number is 10.

• waitAll() => promise

Wait all external process's termination.

License

MIT License