michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  * vim: sw=2 ts=8 et :
michael@0:  */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef mozilla_ipc_SharedMemoryBasic_android_h
michael@0: #define mozilla_ipc_SharedMemoryBasic_android_h
michael@0: 
michael@0: #include "base/file_descriptor_posix.h"
michael@0: 
michael@0: #include "SharedMemory.h"
michael@0: 
michael@0: //
michael@0: // This is a low-level wrapper around platform shared memory.  Don't
michael@0: // use it directly; use Shmem allocated through IPDL interfaces.
michael@0: //
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace ipc {
michael@0: 
michael@0: class SharedMemoryBasic : public SharedMemory
michael@0: {
michael@0: public:
michael@0:   typedef base::FileDescriptor Handle;
michael@0: 
michael@0:   SharedMemoryBasic();
michael@0: 
michael@0:   SharedMemoryBasic(const Handle& aHandle);
michael@0: 
michael@0:   virtual ~SharedMemoryBasic();
michael@0: 
michael@0:   virtual bool Create(size_t aNbytes) MOZ_OVERRIDE;
michael@0: 
michael@0:   virtual bool Map(size_t nBytes) MOZ_OVERRIDE;
michael@0: 
michael@0:   virtual void* memory() const MOZ_OVERRIDE
michael@0:   {
michael@0:     return mMemory;
michael@0:   }
michael@0: 
michael@0:   virtual SharedMemoryType Type() const MOZ_OVERRIDE
michael@0:   {
michael@0:     return TYPE_BASIC;
michael@0:   }
michael@0: 
michael@0:   static Handle NULLHandle()
michael@0:   {
michael@0:     return Handle();
michael@0:   }
michael@0: 
michael@0:   static bool IsHandleValid(const Handle &aHandle)
michael@0:   {
michael@0:     return aHandle.fd >= 0;
michael@0:   }
michael@0: 
michael@0:   bool ShareToProcess(base::ProcessHandle aProcess,
michael@0:                       Handle* aNewHandle);
michael@0: 
michael@0: private:
michael@0:   void Unmap();
michael@0:   void Destroy();
michael@0: 
michael@0:   // The /dev/ashmem fd we allocate.
michael@0:   int mShmFd;
michael@0:   // Pointer to mapped region, null if unmapped.
michael@0:   void *mMemory;
michael@0: };
michael@0: 
michael@0: } // namespace ipc
michael@0: } // namespace mozilla
michael@0: 
michael@0: #endif // ifndef mozilla_ipc_SharedMemoryBasic_android_h