gecko-dev/ipc/glue/SharedMemoryBasic_android.h

75 lines
1.6 KiB
C++

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