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+# throat
+
+Throttle the parallelism of an asynchronous, promise returning, function / functions. This has special utility when you set the concurrency to `1`. That way you get a mutually exclusive lock.
+
+[Professionally supported throat is now available](https://tidelift.com/subscription/pkg/npm-throat?utm_source=npm-throat&utm_medium=referral&utm_campaign=readme)
+
+[![Build Status](https://img.shields.io/github/workflow/status/ForbesLindesay/throat/Test/master?style=for-the-badge)](https://github.com/ForbesLindesay/throat/actions?query=workflow%3ATest+branch%3Amaster)
+[![Coveralls github branch](https://img.shields.io/coveralls/github/ForbesLindesay/throat/master?color=brightgreen&style=for-the-badge)](https://coveralls.io/github/ForbesLindesay/throat)
+[![Rolling Versions](https://img.shields.io/badge/Rolling%20Versions-Enabled-brightgreen?style=for-the-badge)](https://rollingversions.com/ForbesLindesay/throat)
+[![NPM version](https://img.shields.io/npm/v/throat?style=for-the-badge)](https://www.npmjs.com/package/throat)
+
+## Installation
+
+    npm install throat
+
+## API
+
+### throat(concurrency)
+
+This returns a function that acts a bit like a lock (exactly as a lock if concurrency is 1).
+
+Example, only 2 of the following functions will execute at any one time:
+
+```js
+const throat = require('throat')(2);
+
+const resA = throat(async () => { /* async stuff... */ });
+const resB = throat(async () => { /* async stuff... */ });
+const resC = throat(async () => { /* async stuff... */ });
+const resD = throat(async () => { /* async stuff... */ });
+const resE = throat(async () => { /* async stuff... */ });
+```
+
+### throat(concurrency, worker)
+
+This returns a function that is an exact copy of `worker` except that it will only execute up to `concurrency` times in parallel before further requests are queued:
+
+```js
+const throat = require('throat');
+
+const input = ['fileA.txt', 'fileB.txt', 'fileC.txt', 'fileD.txt'];
+const data = Promise.all(
+  input.map(throat(2, (fileName) => readFile(fileName)))
+);
+```
+
+Only 2 files will be read at a time, sometimes limiting parallelism in this way can improve scalability.
+
+## Security contact information
+
+To report a security vulnerability, please use the [Tidelift security contact](https://tidelift.com/security). Tidelift will coordinate the fix and disclosure.
+
+## License
+
+MIT