- initial version

git-svn-id: http://moon:8086/svn/software/trunk/projects/RBM@14 b431acfa-c32f-4a4a-93f1-934dc6c82436
2014-09-24 17:21:29 +00:00
commit 470437eecb
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+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2013 - Raw Material Software Ltd.
+
+   Permission is granted to use this software under the terms of either:
+   a) the GPL v2 (or any later version)
+   b) the Affero GPL v3
+
+   Details of these licenses can be found at: www.gnu.org/licenses
+
+   JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+   ------------------------------------------------------------------------------
+
+   To release a closed-source product which uses JUCE, commercial licenses are
+   available: visit www.juce.com for more information.
+
+  ==============================================================================
+*/
+
+class AsyncUpdater::AsyncUpdaterMessage  : public CallbackMessage
+{
+public:
+    AsyncUpdaterMessage (AsyncUpdater& au)  : owner (au) {}
+
+    void messageCallback() override
+    {
+        if (shouldDeliver.compareAndSetBool (0, 1))
+            owner.handleAsyncUpdate();
+    }
+
+    Atomic<int> shouldDeliver;
+
+private:
+    AsyncUpdater& owner;
+
+    JUCE_DECLARE_NON_COPYABLE (AsyncUpdaterMessage)
+};
+
+//==============================================================================
+AsyncUpdater::AsyncUpdater()
+{
+    activeMessage = new AsyncUpdaterMessage (*this);
+}
+
+AsyncUpdater::~AsyncUpdater()
+{
+    // You're deleting this object with a background thread while there's an update
+    // pending on the main event thread - that's pretty dodgy threading, as the callback could
+    // happen after this destructor has finished. You should either use a MessageManagerLock while
+    // deleting this object, or find some other way to avoid such a race condition.
+    jassert ((! isUpdatePending()) || MessageManager::getInstance()->currentThreadHasLockedMessageManager());
+
+    activeMessage->shouldDeliver.set (0);
+}
+
+void AsyncUpdater::triggerAsyncUpdate()
+{
+    if (activeMessage->shouldDeliver.compareAndSetBool (1, 0))
+        if (! activeMessage->post())
+            cancelPendingUpdate(); // if the message queue fails, this avoids getting
+                                   // trapped waiting for the message to arrive
+}
+
+void AsyncUpdater::cancelPendingUpdate() noexcept
+{
+    activeMessage->shouldDeliver.set (0);
+}
+
+void AsyncUpdater::handleUpdateNowIfNeeded()
+{
+    // This can only be called by the event thread.
+    jassert (MessageManager::getInstance()->currentThreadHasLockedMessageManager());
+
+    if (activeMessage->shouldDeliver.exchange (0) != 0)
+        handleAsyncUpdate();
+}
+
+bool AsyncUpdater::isUpdatePending() const noexcept
+{
+    return activeMessage->shouldDeliver.value != 0;
+}