1 files changed, 98 insertions, 0 deletions
diff --git a/testing/web-platform/tests/web-locks/mode-mixed.tentative.https.any.js b/testing/web-platform/tests/web-locks/mode-mixed.tentative.https.any.js
new file mode 100644
index 0000000000..5f34588693
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+++ b/testing/web-platform/tests/web-locks/mode-mixed.tentative.https.any.js
@@ -0,0 +1,98 @@
+// META: title=Web Locks API: Mixed Modes
+// META: script=resources/helpers.js
+// META: global=window,dedicatedworker,sharedworker,serviceworker
+
+'use strict';
+
+promise_test(async t => {
+  let unblock;
+  const blocked = new Promise(r => { unblock = r; });
+
+  const granted = [];
+
+  // These should be granted immediately, and held until unblocked.
+  navigator.locks.request('a', {mode: 'shared'}, async lock => {
+    granted.push('a-shared-1'); await blocked; });
+  navigator.locks.request('a', {mode: 'shared'}, async lock => {
+    granted.push('a-shared-2'); await blocked; });
+  navigator.locks.request('a', {mode: 'shared'}, async lock => {
+    granted.push('a-shared-3'); await blocked; });
+
+  // This should be blocked.
+  let exclusive_lock;
+  const exclusive_request = navigator.locks.request('a', async lock => {
+    granted.push('a-exclusive');
+    exclusive_lock = lock;
+  });
+
+  // This should be granted immediately (different name).
+  await navigator.locks.request('b', {mode: 'exclusive'}, lock => {
+    granted.push('b-exclusive'); });
+
+  assert_array_equals(
+    granted, ['a-shared-1', 'a-shared-2', 'a-shared-3', 'b-exclusive']);
+
+  // Release the shared locks granted above.
+  unblock();
+
+  // Now the blocked request can be granted.
+  await exclusive_request;
+  assert_equals(exclusive_lock.mode, 'exclusive');
+
+  assert_array_equals(
+    granted,
+    ['a-shared-1', 'a-shared-2', 'a-shared-3', 'b-exclusive', 'a-exclusive']);
+
+}, 'Lock requests are granted in order');
+
+promise_test(async t => {
+  const res = uniqueName(t);
+
+  let [promise, resolve] = makePromiseAndResolveFunc();
+
+  const exclusive = navigator.locks.request(res, () => promise);
+  for (let i = 0; i < 5; i++) {
+    requestLockAndHold(t, res, { mode: "shared" });
+  }
+
+  let answer = await navigator.locks.query();
+  assert_equals(answer.held.length, 1, "An exclusive lock is held");
+  assert_equals(answer.pending.length, 5, "Requests for shared locks are pending");
+  resolve();
+  await exclusive;
+
+  answer = await navigator.locks.query();
+  assert_equals(answer.held.length, 5, "Shared locks are held");
+  assert_true(answer.held.every(l => l.mode === "shared"), "All held locks are shared ones");
+}, 'Releasing exclusive lock grants multiple shared locks');
+
+promise_test(async t => {
+  const res = uniqueName(t);
+
+  let [sharedPromise, sharedResolve] = makePromiseAndResolveFunc();
+  let [exclusivePromise, exclusiveResolve] = makePromiseAndResolveFunc();
+
+  const sharedReleasedPromise = Promise.all(new Array(5).fill(0).map(
+    () => navigator.locks.request(res, { mode: "shared" }, () => sharedPromise))
+  );
+  const exclusiveReleasedPromise = navigator.locks.request(res, () => exclusivePromise);
+  for (let i = 0; i < 5; i++) {
+    requestLockAndHold(t, res, { mode: "shared" });
+  }
+
+  let answer = await navigator.locks.query();
+  assert_equals(answer.held.length, 5, "Shared locks are held");
+  assert_true(answer.held.every(l => l.mode === "shared"), "All held locks are shared ones");
+  sharedResolve();
+  await sharedReleasedPromise;
+
+  answer = await navigator.locks.query();
+  assert_equals(answer.held.length, 1, "An exclusive lock is held");
+  assert_equals(answer.held[0].mode, "exclusive");
+  exclusiveResolve();
+  await exclusiveReleasedPromise;
+
+  answer = await navigator.locks.query();
+  assert_equals(answer.held.length, 5, "The next shared locks are held");
+  assert_true(answer.held.every(l => l.mode === "shared"), "All held locks are shared ones");
+}, 'An exclusive lock between shared locks');