Bun.mmap() (#134)

* Bun.mmap()

* nitpicks

1 files changed, 49 insertions, 0 deletions

diff --git a/integration/bunjs-only-snippets/mmap.test.js b/integration/bunjs-only-snippets/mmap.test.js
new file mode 100644
index 000000000..03ce75e87
--- /dev/null
+++ b/integration/bunjs-only-snippets/mmap.test.js
@@ -0,0 +1,49 @@
+import { describe, it, expect } from "bun:test";
+
+const path = `/tmp/bun-mmap-test_${Math.random()}.txt`;
+
+await Bun.write(path, "hello");
+
+it("mmap finalizer", async () => {
+  let map = Bun.mmap(path);
+  const map2 = Bun.mmap(path);
+
+  map = null;
+  Bun.gc(true);
+  await new Promise(resolve => setTimeout(resolve, 1));
+});
+
+it('mmap passed to other syscalls', async () => {
+  const map = Bun.mmap(path);
+  await Bun.write(path + '1', map);
+  const text = await (await Bun.file(path + '1')).text();
+
+  expect(text).toBe(new TextDecoder().decode(map));
+});
+
+it("mmap sync", async () => {
+  const map = Bun.mmap(path);
+  const map2 = Bun.mmap(path);
+
+  const old = map[0];
+
+  map[0] = 0;
+  expect(map2[0]).toBe(0);
+
+  map2[0] = old;
+  expect(map[0]).toBe(old);
+
+  await Bun.write(path, "olleh");
+  expect(new TextDecoder().decode(map)).toBe("olleh");
+});
+
+it("mmap private", () => {
+  const map = Bun.mmap(path, { shared: true });
+  const map2 = Bun.mmap(path, { shared: false });
+
+  const old = map[0];
+
+  map2[0] = 0;
+  expect(map2[0]).toBe(0);
+  expect(map[0]).toBe(old);
+});
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