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/* 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 THREADSAFEREFCOUNTINGWITHMAINTHREADDESTRUCTION_H_
#define THREADSAFEREFCOUNTINGWITHMAINTHREADDESTRUCTION_H_
#include "base/message_loop.h"
#include "MainThreadUtils.h"
#include "nsThreadUtils.h"
namespace mozilla {
namespace layers {
inline MessageLoop* GetMainLoopAssertingMainThread()
{
MOZ_ASSERT(NS_IsMainThread());
return MessageLoop::current();
}
inline MessageLoop* GetMainLoop()
{
static MessageLoop* sMainLoop = GetMainLoopAssertingMainThread();
return sMainLoop;
}
struct HelperForMainThreadDestruction
{
HelperForMainThreadDestruction()
{
MOZ_ASSERT(NS_IsMainThread());
GetMainLoop();
}
~HelperForMainThreadDestruction()
{
MOZ_ASSERT(NS_IsMainThread());
}
};
template<typename T>
struct DeleteOnMainThreadTask : public Runnable
{
T* mToDelete;
explicit DeleteOnMainThreadTask(T* aToDelete) : mToDelete(aToDelete) {}
NS_IMETHOD Run() override {
MOZ_ASSERT(NS_IsMainThread());
mToDelete->DeleteToBeCalledOnMainThread();
return NS_OK;
}
};
} // namespace layers
} // namespace mozilla
#define NS_INLINE_DECL_THREADSAFE_REFCOUNTING_WITH_MAIN_THREAD_DESTRUCTION(_class) \
public: \
NS_METHOD_(MozExternalRefCountType) AddRef(void) { \
MOZ_ASSERT_TYPE_OK_FOR_REFCOUNTING(_class) \
MOZ_ASSERT(int32_t(mRefCnt) >= 0, "illegal refcnt"); \
nsrefcnt count = ++mRefCnt; \
NS_LOG_ADDREF(this, count, #_class, sizeof(*this)); \
return (nsrefcnt) count; \
} \
void DeleteToBeCalledOnMainThread() { \
MOZ_ASSERT(NS_IsMainThread()); \
NS_LOG_RELEASE(this, 0, #_class); \
delete this; \
} \
NS_METHOD_(MozExternalRefCountType) Release(void) { \
MOZ_ASSERT(int32_t(mRefCnt) > 0, "dup release"); \
nsrefcnt count = --mRefCnt; \
if (count == 0) { \
if (NS_IsMainThread()) { \
DeleteToBeCalledOnMainThread(); \
} else { \
NS_DispatchToMainThread( \
new mozilla::layers::DeleteOnMainThreadTask<_class>(this)); \
} \
} else { \
NS_LOG_RELEASE(this, count, #_class); \
} \
return count; \
} \
protected: \
::mozilla::ThreadSafeAutoRefCnt mRefCnt; \
private: \
::mozilla::layers::HelperForMainThreadDestruction mHelperForMainThreadDestruction; \
public:
#endif
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