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-rw-r--r--dom/fs/shared/TargetPtrHolder.h59
1 files changed, 59 insertions, 0 deletions
diff --git a/dom/fs/shared/TargetPtrHolder.h b/dom/fs/shared/TargetPtrHolder.h
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+++ b/dom/fs/shared/TargetPtrHolder.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 DOM_FS_SHARED_TARGETPTRHOLDER_H_
+#define DOM_FS_SHARED_TARGETPTRHOLDER_H_
+
+#include "mozilla/RefPtr.h"
+#include "nsCOMPtr.h"
+#include "nsProxyRelease.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla::dom::fs {
+
+// TODO: Remove this ad hoc class when bug 1805830 is fixed.
+template <typename T>
+class TargetPtrHolder {
+ public:
+ MOZ_IMPLICIT TargetPtrHolder(T* aRawPtr)
+ : mTarget(GetCurrentSerialEventTarget()), mPtr(aRawPtr) {
+ MOZ_ASSERT(mPtr);
+ }
+
+ TargetPtrHolder(const TargetPtrHolder&) = default;
+
+ TargetPtrHolder& operator=(const TargetPtrHolder&) = default;
+
+ TargetPtrHolder(TargetPtrHolder&&) = default;
+
+ TargetPtrHolder& operator=(TargetPtrHolder&&) = default;
+
+ ~TargetPtrHolder() {
+ if (!mPtr) {
+ return;
+ }
+
+ NS_ProxyRelease("TargetPtrHolder::mPtr", mTarget, mPtr.forget());
+ }
+
+ T* get() const {
+ MOZ_ASSERT(mPtr);
+
+ return mPtr.get();
+ }
+
+ T* operator->() const MOZ_NO_ADDREF_RELEASE_ON_RETURN { return get(); }
+
+ bool operator!() { return !mPtr.get(); }
+
+ private:
+ nsCOMPtr<nsISerialEventTarget> mTarget;
+ RefPtr<T> mPtr;
+};
+
+} // namespace mozilla::dom::fs
+
+#endif // DOM_FS_SHARED_TARGETPTRHOLDER_H_