Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 58 insertions, 0 deletions

diff --git a/Source/WebCore/platform/MemoryPressureHandler.h b/Source/WebCore/platform/MemoryPressureHandler.h
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+++ b/Source/WebCore/platform/MemoryPressureHandler.h
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+/*
+ * Copyright (C) 2011 Apple 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
+ */
+
+#ifndef MemoryPressureHandler_h
+#define MemoryPressureHandler_h
+
+#include <time.h>
+#include <wtf/Platform.h>
+
+namespace WebCore {
+
+class MemoryPressureHandler {
+public:
+    friend MemoryPressureHandler& memoryPressureHandler();
+
+    void install();
+    void uninstall();
+
+    void holdOff(unsigned);
+
+private:
+    MemoryPressureHandler();
+    ~MemoryPressureHandler();
+
+    void respondToMemoryPressure();
+
+    bool m_installed;
+    time_t m_lastRespondTime;
+};
+ 
+// Function to obtain the global memory pressure object.
+MemoryPressureHandler& memoryPressureHandler();
+
+} // namespace WebCore
+
+#endif // MemoryPressureHandler_h