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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /netwerk/base/AutoClose.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'netwerk/base/AutoClose.h')
-rw-r--r--netwerk/base/AutoClose.h77
1 files changed, 77 insertions, 0 deletions
diff --git a/netwerk/base/AutoClose.h b/netwerk/base/AutoClose.h
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+++ b/netwerk/base/AutoClose.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=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 mozilla_net_AutoClose_h
+#define mozilla_net_AutoClose_h
+
+#include "nsCOMPtr.h"
+#include "mozilla/Mutex.h"
+
+namespace mozilla { namespace net {
+
+// Like an nsAutoPtr for XPCOM streams (e.g. nsIAsyncInputStream) and other
+// refcounted classes that need to have the Close() method called explicitly
+// before they are destroyed.
+template <typename T>
+class AutoClose
+{
+public:
+ AutoClose() : mMutex("net::AutoClose.mMutex") { }
+ ~AutoClose(){
+ CloseAndRelease();
+ }
+
+ explicit operator bool()
+ {
+ MutexAutoLock lock(mMutex);
+ return mPtr;
+ }
+
+ already_AddRefed<T> forget()
+ {
+ MutexAutoLock lock(mMutex);
+ return mPtr.forget();
+ }
+
+ void takeOver(nsCOMPtr<T> & rhs)
+ {
+ already_AddRefed<T> other = rhs.forget();
+ TakeOverInternal(&other);
+ }
+
+ void CloseAndRelease()
+ {
+ TakeOverInternal(nullptr);
+ }
+
+private:
+ void TakeOverInternal(already_AddRefed<T> *aOther)
+ {
+ nsCOMPtr<T> ptr;
+ {
+ MutexAutoLock lock(mMutex);
+ ptr.swap(mPtr);
+ if (aOther) {
+ mPtr = *aOther;
+ }
+ }
+
+ if (ptr) {
+ ptr->Close();
+ }
+ }
+
+ void operator=(const AutoClose<T> &) = delete;
+ AutoClose(const AutoClose<T> &) = delete;
+
+ nsCOMPtr<T> mPtr;
+ Mutex mMutex;
+};
+
+} // namespace net
+} // namespace mozilla
+
+#endif // mozilla_net_AutoClose_h