1 files changed, 222 insertions, 0 deletions
diff --git a/src/3rdparty/webkit/WebCore/dom/default/PlatformMessagePortChannel.cpp b/src/3rdparty/webkit/WebCore/dom/default/PlatformMessagePortChannel.cpp
new file mode 100644
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--- /dev/null
+++ b/src/3rdparty/webkit/WebCore/dom/default/PlatformMessagePortChannel.cpp
@@ -0,0 +1,222 @@
+/*
+ * Copyright (C) 2009 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "PlatformMessagePortChannel.h"
+
+#include "MessagePort.h"
+#include "ScriptExecutionContext.h"
+
+namespace WebCore {
+
+// MessagePortChannel implementations - just delegate to the PlatformMessagePortChannel.
+bool MessagePortChannel::entangleIfOpen(MessagePort* port)
+{
+    return m_channel->entangleIfOpen(port);
+}
+
+void MessagePortChannel::disentangle()
+{
+    m_channel->disentangle();
+}
+
+void MessagePortChannel::postMessageToRemote(PassOwnPtr<MessagePortChannel::EventData> message)
+{
+    m_channel->postMessageToRemote(message);
+}
+
+bool MessagePortChannel::tryGetMessageFromRemote(OwnPtr<MessagePortChannel::EventData>& result)
+{
+    return m_channel->tryGetMessageFromRemote(result);
+}
+
+void MessagePortChannel::close()
+{
+    m_channel->close();
+}
+
+bool MessagePortChannel::isConnectedTo(MessagePort* port)
+{
+    return m_channel->isConnectedTo(port);
+}
+
+bool MessagePortChannel::hasPendingActivity()
+{
+    return m_channel->hasPendingActivity();
+}
+
+MessagePort* MessagePortChannel::locallyEntangledPort(const ScriptExecutionContext* context)
+{
+    return m_channel->locallyEntangledPort(context);
+}
+
+PassRefPtr<PlatformMessagePortChannel> PlatformMessagePortChannel::create(PassRefPtr<MessagePortQueue> incoming, PassRefPtr<MessagePortQueue> outgoing)
+{
+    return adoptRef(new PlatformMessagePortChannel(incoming, outgoing));
+}
+
+PlatformMessagePortChannel::PlatformMessagePortChannel(PassRefPtr<MessagePortQueue> incoming, PassRefPtr<MessagePortQueue> outgoing)
+    : m_entangledChannel(0)
+    , m_incomingQueue(incoming)
+    , m_outgoingQueue(outgoing)
+    , m_remotePort(0)
+{
+}
+
+PlatformMessagePortChannel::~PlatformMessagePortChannel()
+{
+}
+
+void PlatformMessagePortChannel::createChannel(PassRefPtr<MessagePort> port1, PassRefPtr<MessagePort> port2)
+{
+    // Create incoming/outgoing queues.
+    RefPtr<PlatformMessagePortChannel::MessagePortQueue> queue1 = PlatformMessagePortChannel::MessagePortQueue::create();
+    RefPtr<PlatformMessagePortChannel::MessagePortQueue> queue2 = PlatformMessagePortChannel::MessagePortQueue::create();
+
+    // Create proxies for each endpoint.
+    RefPtr<PlatformMessagePortChannel> channel1 = PlatformMessagePortChannel::create(queue1, queue2);
+    RefPtr<PlatformMessagePortChannel> channel2 = PlatformMessagePortChannel::create(queue2, queue1);
+
+    // Entangle the two endpoints.
+    channel1->setEntangledChannel(channel2);
+    channel2->setEntangledChannel(channel1);
+
+    // Now entangle the proxies with the appropriate local ports.
+    port1->entangle(MessagePortChannel::create(channel2));
+    port2->entangle(MessagePortChannel::create(channel1));
+}
+
+bool PlatformMessagePortChannel::entangleIfOpen(MessagePort* port)
+{
+    // We can't call member functions on our remote pair while holding our mutex or we'll deadlock, but we need to guard against the remote port getting closed/freed, so create a standalone reference.
+    RefPtr<PlatformMessagePortChannel> remote = entangledChannel();
+    if (!remote)
+        return false;
+    remote->setRemotePort(port);
+    return true;
+}
+
+void PlatformMessagePortChannel::disentangle()
+{
+    RefPtr<PlatformMessagePortChannel> remote = entangledChannel();
+    if (remote)
+        remote->setRemotePort(0);
+}
+
+void PlatformMessagePortChannel::setRemotePort(MessagePort* port)
+{
+    MutexLocker lock(m_mutex);
+    // Should never set port if it is already set.
+    ASSERT(!port || !m_remotePort);
+    m_remotePort = port;
+}
+
+MessagePort* PlatformMessagePortChannel::remotePort()
+{
+    MutexLocker lock(m_mutex);
+    return m_remotePort;
+}
+
+PassRefPtr<PlatformMessagePortChannel> PlatformMessagePortChannel::entangledChannel()
+{
+    MutexLocker lock(m_mutex);
+    return m_entangledChannel;
+}
+
+void PlatformMessagePortChannel::setEntangledChannel(PassRefPtr<PlatformMessagePortChannel> remote)
+{
+    MutexLocker lock(m_mutex);
+    // Should only be set as part of initial creation/entanglement.
+    if (remote)
+        ASSERT(!m_entangledChannel.get());
+    m_entangledChannel = remote;
+}
+
+void PlatformMessagePortChannel::postMessageToRemote(PassOwnPtr<MessagePortChannel::EventData> message)
+{
+    MutexLocker lock(m_mutex);
+    if (!m_outgoingQueue)
+        return;
+    bool wasEmpty = m_outgoingQueue->appendAndCheckEmpty(message);
+    if (wasEmpty && m_remotePort)
+        m_remotePort->messageAvailable();
+}
+
+bool PlatformMessagePortChannel::tryGetMessageFromRemote(OwnPtr<MessagePortChannel::EventData>& result)
+{
+    MutexLocker lock(m_mutex);
+    return m_incomingQueue->tryGetMessage(result);
+}
+
+bool PlatformMessagePortChannel::isConnectedTo(MessagePort* port)
+{
+    MutexLocker lock(m_mutex);
+    return m_remotePort == port;
+}
+
+// Closes the port so no further messages can be sent from either end.
+void PlatformMessagePortChannel::close()
+{
+    RefPtr<PlatformMessagePortChannel> remote = entangledChannel();
+    if (!remote)
+        return;
+    closeInternal();
+    remote->closeInternal();
+}
+
+void PlatformMessagePortChannel::closeInternal()
+{
+    MutexLocker lock(m_mutex);
+    // Disentangle ourselves from the other end. We still maintain a reference to our incoming queue, since previously-existing messages should still be delivered.
+    m_remotePort = 0;
+    m_entangledChannel = 0;
+    m_outgoingQueue = 0;
+}
+
+bool PlatformMessagePortChannel::hasPendingActivity()
+{
+    MutexLocker lock(m_mutex);
+    return !m_incomingQueue->isEmpty();
+}
+
+MessagePort* PlatformMessagePortChannel::locallyEntangledPort(const ScriptExecutionContext* context)
+{
+    MutexLocker lock(m_mutex);
+    // See if both contexts are run by the same thread (are the same context, or are both documents).
+    if (m_remotePort) {
+        // The remote port's ScriptExecutionContext is guaranteed not to change here - MessagePort::contextDestroyed() will close the port before the context goes away, and close() will block because we are holding the mutex.
+        ScriptExecutionContext* remoteContext = m_remotePort->scriptExecutionContext();
+        if (remoteContext == context || (remoteContext && remoteContext->isDocument() && context->isDocument()))
+            return m_remotePort;
+    }
+    return 0;
+}
+
+} // namespace WebCore