mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* 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_SHAREDBUFFER_H_
|
|
#define MOZILLA_SHAREDBUFFER_H_
|
|
|
|
#include "mozilla/mozalloc.h"
|
|
#include "nsCOMPtr.h"
|
|
#include "nsAutoPtr.h"
|
|
|
|
namespace mozilla {
|
|
|
|
/**
|
|
* Heap-allocated chunk of arbitrary data with threadsafe refcounting.
|
|
* Typically you would allocate one of these, fill it in, and then treat it as
|
|
* immutable while it's shared.
|
|
* This only guarantees 4-byte alignment of the data. For alignment we
|
|
* simply assume that the refcount is at least 4-byte aligned and its size
|
|
* is divisible by 4.
|
|
*/
|
|
class SharedBuffer {
|
|
public:
|
|
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(SharedBuffer)
|
|
~SharedBuffer() {}
|
|
|
|
void* Data() { return this + 1; }
|
|
|
|
// Takes ownership of aData (which will be freed via moz_free()).
|
|
// aData consists of aChannels consecutive buffers, each of aLength samples.
|
|
static already_AddRefed<SharedBuffer> Create(size_t aSize)
|
|
{
|
|
void* m = moz_xmalloc(sizeof(SharedBuffer) + aSize);
|
|
nsRefPtr<SharedBuffer> p = new (m) SharedBuffer();
|
|
NS_ASSERTION((reinterpret_cast<char*>(p.get() + 1) - reinterpret_cast<char*>(p.get())) % 4 == 0,
|
|
"SharedBuffers should be at least 4-byte aligned");
|
|
return p.forget();
|
|
}
|
|
|
|
private:
|
|
SharedBuffer() {}
|
|
};
|
|
|
|
}
|
|
|
|
#endif /* MOZILLA_SHAREDBUFFER_H_ */
|