47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "MemMapSnapshot.h"
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#include "mozilla/ResultExtensions.h"
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namespace mozilla::ipc {
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Result<Ok, nsresult> MemMapSnapshot::Init(size_t aSize) {
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MOZ_ASSERT(!mMem);
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auto aMem = MakeRefPtr<SharedMemory>();
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if (NS_WARN_IF(!aMem->CreateFreezable(aSize))) {
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return Err(NS_ERROR_FAILURE);
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}
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if (NS_WARN_IF(!aMem->Map(aSize))) {
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return Err(NS_ERROR_FAILURE);
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}
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mMem = std::move(aMem);
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return Ok();
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}
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Result<Ok, nsresult> MemMapSnapshot::Finalize(RefPtr<SharedMemory>& aMem) {
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MOZ_ASSERT(mMem);
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auto size = mMem->Size();
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if (NS_WARN_IF(!mMem->Freeze())) {
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return Err(NS_ERROR_FAILURE);
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}
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aMem = std::move(mMem);
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// We need to re-map the memory as `Freeze()` unmaps it.
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if (NS_WARN_IF(!aMem->Map(size))) {
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return Err(NS_ERROR_FAILURE);
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}
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return Ok();
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}
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} // namespace mozilla::ipc
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