10/15/2019 C Lock Free
You have to read all the cited materials and much more, make sure you really understand all nuances of lock-free algorithms such as ABA, study various techniques intended to address the issue, study existing lock-free implementations, etc. Finally, little guidance for translating the given pseudo-code into C: q^.value ← x means qelem-data = x.
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How could I implement this lock-free queue pseudocode in
C ?
How would be using the Built-in functions for atomic memory access
I currently have
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5 Answers
Public domain, no license, portable implementation of lock-free algorithms in C. Postgresql windows 10.
Builds out of the box for Windows and Linux.
Uses GCC on Linux, so uses the intrinsics (well, apart from 128 bit CAS, there's no intrinsic - uses inline assembly for that).
Contains the M&S queue. Have a look at the source code and see how it's done.
user82238
If your goal is production code, simply don't do that; use locks.
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In your previous question, you have got enough information explaining why. Correct lock-free implementations of even simple data structures such as queue and stack in the absence of garbage collector are tricky and sophisticated due to the (in)famous ABA problem. Unfortunately some research papers do not take ABA into account for whatever reasons; your pseudo-code seems taken from one of such papers. If you translate it to C and use heap allocated memory for nodes, it will cause undeterministic bugs if used in real code.
If you are doing this stuff to gain experience, then don't expect SO fellows to solve it for you. You have to read all the cited materials and much more, make sure you really understand all nuances of lock-free algorithms such as ABA, study various techniques intended to address the issue, study existing lock-free implementations, etc.
Finally, little guidance for translating the given pseudo-code into C:
q^.value ← x means q_elem->data = x; repeat .. until COMPARE&SWAP(head, p, p^.next) is equivalent to do {..} while (!__sync_bool_compare_and_swap(q_obj->head, q_elem, q_elem->next);
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where
q_obj is an instance of type queue_t (i.e. a queue) and q_elem is an instance of type queueelem_t (i.e. a queue node).
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Alexey KukanovAlexey Kukanov
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While not exactly C, check out the proposed Boost.Lockfree library. The internals are pretty easy to grok and could be ported to C, or, conversely, you could wrap Boost.Lockfree in a C API and use that.
Similarly, Boostcon 2010 had lots of discussion about lockfree programming and STM which is worth looking at if you're interested in this subject. I can't find a link to the videos, but the talks from Intel, IBM and AMD were worth watching since they're dealing with STM at the CPU level.
SeanSean
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It sounds like what you want is called an MCS queue lock (although deceptively named, it's really lock-free, just not wait-free), and there is some good pseudo-code available here: http://www.cs.rochester.edu/research/synchronization/pseudocode/ss.html#mcs
mattst88mattst88
I use C to write a minimize lockfree queue implementation.
lfq.
It support many producer, many consumer.
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Darkautism NongDarkautism Nong
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