summaryrefslogtreecommitdiffstats
path: root/ipc/mscom/WeakRef.h
diff options
context:
space:
mode:
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 /ipc/mscom/WeakRef.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
downloadUXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.gz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.lz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.xz
UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.zip
Add m-esr52 at 52.6.0
Diffstat (limited to 'ipc/mscom/WeakRef.h')
-rw-r--r--ipc/mscom/WeakRef.h104
1 files changed, 104 insertions, 0 deletions
diff --git a/ipc/mscom/WeakRef.h b/ipc/mscom/WeakRef.h
new file mode 100644
index 000000000..4b4835aa5
--- /dev/null
+++ b/ipc/mscom/WeakRef.h
@@ -0,0 +1,104 @@
+/* -*- 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 mozilla_mscom_WeakRef_h
+#define mozilla_mscom_WeakRef_h
+
+#include <guiddef.h>
+#include <unknwn.h>
+
+#include "mozilla/Mutex.h"
+#include "nsTArray.h"
+
+/**
+ * Thread-safe weak references for COM that works pre-Windows 8 and do not
+ * require WinRT.
+ */
+
+namespace mozilla {
+namespace mscom {
+
+// {F841AEFA-064C-49A4-B73D-EBD14A90F012}
+DEFINE_GUID(IID_IWeakReference,
+0xf841aefa, 0x64c, 0x49a4, 0xb7, 0x3d, 0xeb, 0xd1, 0x4a, 0x90, 0xf0, 0x12);
+
+struct IWeakReference : public IUnknown
+{
+ virtual STDMETHODIMP Resolve(REFIID aIid, void** aOutStringReference) = 0;
+};
+
+// {87611F0C-9BBB-4F78-9D43-CAC5AD432CA1}
+DEFINE_GUID(IID_IWeakReferenceSource,
+0x87611f0c, 0x9bbb, 0x4f78, 0x9d, 0x43, 0xca, 0xc5, 0xad, 0x43, 0x2c, 0xa1);
+
+struct IWeakReferenceSource : public IUnknown
+{
+ virtual STDMETHODIMP GetWeakReference(IWeakReference** aOutWeakRef) = 0;
+};
+
+class WeakRef;
+
+class WeakReferenceSupport : public IWeakReferenceSource
+{
+public:
+ enum class Flags
+ {
+ eNone = 0,
+ eDestroyOnMainThread = 1
+ };
+
+ // IUnknown
+ STDMETHODIMP QueryInterface(REFIID riid, void** ppv) override;
+ STDMETHODIMP_(ULONG) AddRef() override;
+ STDMETHODIMP_(ULONG) Release() override;
+
+ // IWeakReferenceSource
+ STDMETHODIMP GetWeakReference(IWeakReference** aOutWeakRef) override;
+
+protected:
+ explicit WeakReferenceSupport(Flags aFlags);
+ virtual ~WeakReferenceSupport();
+
+ virtual HRESULT ThreadSafeQueryInterface(REFIID aIid,
+ IUnknown** aOutInterface) = 0;
+
+private:
+ void ClearWeakRefs();
+
+private:
+ // Using a raw CRITICAL_SECTION here because it can be reentered
+ CRITICAL_SECTION mCS;
+ ULONG mRefCnt;
+ nsTArray<WeakRef*> mWeakRefs;
+ Flags mFlags;
+};
+
+class WeakRef : public IWeakReference
+{
+public:
+ // IUnknown
+ STDMETHODIMP QueryInterface(REFIID riid, void** ppv) override;
+ STDMETHODIMP_(ULONG) AddRef() override;
+ STDMETHODIMP_(ULONG) Release() override;
+
+ // IWeakReference
+ STDMETHODIMP Resolve(REFIID aIid, void** aOutStrongReference) override;
+
+ explicit WeakRef(WeakReferenceSupport* aSupport);
+
+ void Clear();
+
+private:
+ ULONG mRefCnt;
+ mozilla::Mutex mMutex; // Protects mSupport
+ WeakReferenceSupport* mSupport;
+};
+
+} // namespace mscom
+} // namespace mozilla
+
+#endif // mozilla_mscom_WeakRef_h
+