An Introduction to Lock-Free Programming
Lock-free programming is a challenge, not just because of the complexity of the task itself, but because of how difficult it can be to penetrate the subject in the first place. I was fortunate in that my first introduction to lock-free (also known as lockless) programming was Bruce Dawson’s excellent and comprehensive white paper, Lockless Programming Considerations. And like many, I’ve had the oc
Memory Ordering at Compile Time
Between the time you type in some C/C++ source code and the time it executes on a CPU, the memory interactions of that code may be reordered according to certain rules. Changes to memory ordering are made both by the compiler (at compile time) and by the processor (at run time), all in the name of making your code run faster. The cardinal rule of memory reordering, which is universally followed by
Understanding Memory Ordering
Introduction In a previous post on atomic operations, I skipped an important topic, which is memory ordering issues. Behind the hood, the processor might reorder memory operations (reads and writes) for many reasons. This is normally not a problem on programs running on single-core machines. On the other hand, multi-threaded programs running on multi-cores machines can suffer from that: the sequen
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