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Unified Diff: Source/core/html/StableState.cpp

Issue 153813002: Support "await a stable state" and "provide a stable state" (Closed) Base URL: svn://svn.chromium.org/blink/trunk
Patch Set: disallow await during provide Created 6 years, 10 months ago
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Index: Source/core/html/StableState.cpp
diff --git a/Source/core/html/StableState.cpp b/Source/core/html/StableState.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f4ea9ba990f9874dfe060fd691f0b5a28d50de6c
--- /dev/null
+++ b/Source/core/html/StableState.cpp
@@ -0,0 +1,41 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/html/StableState.h"
+
+#include "wtf/HashSet.h"
+
+namespace WebCore {
+
+typedef HashSet<StableState::Awaiter*> StableStateAwaiters;
+
+static StableStateAwaiters& stableStateAwaiters()
+{
+ DEFINE_STATIC_LOCAL(StableStateAwaiters, stableStateAwaiters, ());
acolwell GONE FROM CHROMIUM 2014/02/07 19:09:31 Do we really want this process global? Shouldn't t
philipj_slow 2014/02/09 17:10:17 In the spec these concepts are not scoped per docu
+ return stableStateAwaiters;
+}
+
+StableState::Awaiter::~Awaiter()
+{
+ stableStateAwaiters().remove(this);
+}
+
+void StableState::await(Awaiter& awaiter)
+{
+ stableStateAwaiters().add(&awaiter);
acolwell GONE FROM CHROMIUM 2014/02/07 19:09:31 nit: I wonder if we should keep a bool that keeps
philipj_slow 2014/02/09 17:10:17 Done.
+}
+
+void StableState::provide()
+{
+ if (!stableStateAwaiters().isEmpty()) {
acolwell GONE FROM CHROMIUM 2014/02/07 19:09:31 nit: Reverse condition and early return.
philipj_slow 2014/02/09 17:10:17 Done.
+ StableStateAwaiters awaiters;
+ awaiters.swap(stableStateAwaiters());
+ for (StableStateAwaiters::iterator it = awaiters.begin(); it != awaiters.end(); ++it)
+ (*it)->didAwaitStableState();
+ ASSERT(stableStateAwaiters().isEmpty());
+ }
+}
+
+} // namespace WebCore

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