fixup! src,lib: initial ffi implementation

Author: bengl

benchmark/README.md

@@ -25,6 +25,7 @@ directory, see [the guide on benchmarks](../doc/contributing/writing-and-running
 | es              | Benchmarks for various new ECMAScript features and their pre-ES2015 counterparts.                                |
 | events          | Benchmarks for the `events` subsystem.                                                                           |
 | fixtures        | Benchmarks fixtures used in various benchmarks throughout the benchmark suite.                                   |
+| ffi             | Benchmarks for the `ffi` subsystem.                                                                              |
 | fs              | Benchmarks for the `fs` subsystem.                                                                               |
 | http            | Benchmarks for the `http` subsystem.                                                                             |
 | http2           | Benchmarks for the `http2` subsystem.                                                                            |

benchmark/ffi/getpid.js

@@ -0,0 +1,18 @@
+'use strict';
+
+const common = require('../common.js');
+const ffi = require('node:ffi');
+
+const bench = common.createBenchmark(main, {
+  n: [1e7]
+})
+
+const getpid = ffi.getNativeFunction(null, 'uv_os_getpid', 'int', []);
+
+function main({ n }) {
+  bench.start();
+  for (let i = 0; i < n; ++i)
+    getpid();
+  bench.end(n);
+
+}