Merge WebKit at r75993: Initial merge by git.

Change-Id: I602bbdc3974787a3b0450456a30a7868286921c3

1 files changed, 105 insertions, 0 deletions

diff --git a/Source/WebKit2/Platform/SharedMemory.h b/Source/WebKit2/Platform/SharedMemory.h
new file mode 100644
index 0000000..05dc0dd
--- /dev/null
+++ b/Source/WebKit2/Platform/SharedMemory.h
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2010 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. AND ITS 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 APPLE INC. OR ITS 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 SharedMemory_h
+#define SharedMemory_h
+
+#include <wtf/Noncopyable.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+#if PLATFORM(QT)
+#include <QtGlobal>
+QT_BEGIN_NAMESPACE
+class QSharedMemory;
+QT_END_NAMESPACE
+#include <wtf/text/WTFString.h>
+#endif
+
+namespace CoreIPC {
+    class ArgumentDecoder;
+    class ArgumentEncoder;
+}
+
+namespace WebKit {
+
+class SharedMemory : public RefCounted<SharedMemory> {
+public:
+    enum Protection {
+        ReadOnly,
+        ReadWrite
+    };
+
+    class Handle : Noncopyable {
+    public:
+        Handle();
+        ~Handle();
+
+        bool isNull() const;
+
+        void encode(CoreIPC::ArgumentEncoder*) const;
+        static bool decode(CoreIPC::ArgumentDecoder*, Handle&);
+
+    private:
+        friend class SharedMemory;
+#if PLATFORM(MAC)
+        mutable mach_port_t m_port;
+#elif PLATFORM(WIN)
+        mutable HANDLE m_handle;
+#elif PLATFORM(QT)
+        mutable String m_key;
+#endif
+        size_t m_size;
+    };
+    
+    // Create a shared memory object with the given size. Will return 0 on failure.
+    static PassRefPtr<SharedMemory> create(size_t);
+
+    // Create a shared memory object from the given handle and the requested protection. Will return 0 on failure.
+    static PassRefPtr<SharedMemory> create(const Handle&, Protection);
+    
+    ~SharedMemory();
+
+    bool createHandle(Handle&, Protection);
+
+    size_t size() const { return m_size; }
+    void* data() const { return m_data; }
+
+    // Return the system page size in bytes.
+    static unsigned systemPageSize();
+
+private:
+    size_t m_size;
+    void* m_data;
+#if PLATFORM(WIN)
+    HANDLE m_handle;
+#elif PLATFORM(QT)
+    QSharedMemory* m_impl;
+#endif
+};
+
+};
+
+#endif // SharedMemory_h