#ifndef SharedMemory_h
#define SharedMemory_h
#include <wtf/Noncopyable.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#if PLATFORM(QT) || PLATFORM(GTK) || PLATFORM(EFL)
#include "Attachment.h"
#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 {
WTF_MAKE_NONCOPYABLE(Handle);
public:
Handle();
~Handle();
bool isNull() const;
void encode(CoreIPC::ArgumentEncoder&) const;
static bool decode(CoreIPC::ArgumentDecoder&, Handle&);
#if USE(UNIX_DOMAIN_SOCKETS)
CoreIPC::Attachment releaseToAttachment() const;
void adoptFromAttachment(int fileDescriptor, size_t);
#endif
private:
friend class SharedMemory;
#if OS(DARWIN)
mutable mach_port_t m_port;
#elif OS(WINDOWS)
mutable HANDLE m_handle;
#elif USE(UNIX_DOMAIN_SOCKETS)
mutable int m_fileDescriptor;
#endif
size_t m_size;
};
static PassRefPtr<SharedMemory> create(size_t);
static PassRefPtr<SharedMemory> create(const Handle&, Protection);
static PassRefPtr<SharedMemory> createFromVMBuffer(void*, size_t);
#if OS(WINDOWS)
static PassRefPtr<SharedMemory> adopt(HANDLE, size_t, Protection);
#endif
~SharedMemory();
bool createHandle(Handle&, Protection);
size_t size() const { return m_size; }
void* data() const { return m_data; }
#if OS(WINDOWS)
HANDLE handle() const { return m_handle; }
#endif
PassRefPtr<SharedMemory> createCopyOnWriteCopy(size_t) const;
static unsigned systemPageSize();
private:
size_t m_size;
void* m_data;
bool m_shouldVMDeallocateData;
#if OS(DARWIN)
mach_port_t m_port;
#elif OS(WINDOWS)
HANDLE m_handle;
#elif USE(UNIX_DOMAIN_SOCKETS)
int m_fileDescriptor;
#endif
};
};
#endif // SharedMemory_h