This is an accompanying blog for the www.1024cores.net site about lockfree/waitfree synchronization algorithms and data structures, scalability-oriented architecture, multicore design patterns, high-performance computing, threading technologies and libraries, message-passing systems and related topics.
Friday, January 7, 2011
Differential Reference Counting
Just published an article on Differential Reference Counting - reference counting algorithm which provides strong thread-safety and permits useful use cases that are not permitted by plain atomic reference counting (like boost::shared_ptr).
I guess this is not correct way to use the smart pointer. This does not differ from the variant with a regular global pointer, without any reference counting at all.
T * ptr;
// thread 1 ptr->SomeMethod(); //The problem is the same - who is freeing it at this time?
To use it properly, we have to increment the reference counter safely in the thread, who is already an owner of the resource :
// thread 1 shared_ptr ptr(new T); // now this thread is a sole owner of the resource
// lets share it with another thread. shared_ptr ptr2 = ptr;// The counter was incremented in this thread - nobody could free it.
CreateThreadWithContext(Thread2Func, ptr.get());
// thread 2 void Thread2Func(T * p) { shared_ptr ptr(p, false);// false means NOT to increment reference counter again
ptr->SomeMethod();// You can use it safely, You are already an owner, nobody can free it.
}// destructor of shared_ptr decrement reference counter, and free the resource, if this thread is its last owner.
It may be enough for safe life-time management.
But your idea is interesting as a access point to some resource.
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> I guess this is not correct way to use the smart pointer.
It's an incorrect way to use a reference counting algorithm, if it does not support such usage. However, if it does support such usage, then it's a correct usage. Btw, smart pointers are no more than a syntactic sugar.
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I guess this is not correct way to use the smart pointer.
ReplyDeleteThis does not differ from the variant with a regular global pointer, without any reference counting at all.
T * ptr;
// thread 1
ptr->SomeMethod(); //The problem is the same - who is freeing it at this time?
To use it properly, we have to increment the reference counter safely in the thread, who is already an owner of the resource :
// thread 1
shared_ptr ptr(new T);
// now this thread is a sole owner of the resource
// lets share it with another thread.
shared_ptr ptr2 = ptr;// The counter was incremented in this thread - nobody could free it.
CreateThreadWithContext(Thread2Func, ptr.get());
// thread 2
void Thread2Func(T * p)
{
shared_ptr ptr(p, false);// false means NOT to increment reference counter again
ptr->SomeMethod();// You can use it safely, You are already an owner, nobody can free it.
}// destructor of shared_ptr decrement reference counter, and free the resource, if this thread is its last owner.
It may be enough for safe life-time management.
But your idea is interesting as a access point to some resource.
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DeleteSpring Framework has already made serious inroads as an integrated technology stack for building user-facing applications. Spring Framework Corporate TRaining the authors explore the idea of using Java in Big Data platforms.
Specifically, Spring Framework provides various tasks are geared around preparing data for further analysis and visualization. Spring Training in Chennai
> I guess this is not correct way to use the smart pointer.
ReplyDeleteIt's an incorrect way to use a reference counting algorithm, if it does not support such usage. However, if it does support such usage, then it's a correct usage.
Btw, smart pointers are no more than a syntactic sugar.
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