When are x86 LFENCE, SFENCE and MFENCE instructions required?

When are x86 LFENCE, SFENCE and MFENCE instructions required?

multithreading assembly x86 cpu memory-fences

multithreading

How does x86 pause instruction work in spinlock and can it be used in other scenarios?

multithreading x86 cpu-architecture instructions spinlock

multithreading

Can I force cache coherency on a multicore x86 CPU?

c++ multithreading x86 multicore cpu-cache

multithreading

Atomicity on x86

c++ multithreading x86 atomic memory-barriers

multithreading

Why does using the same cache-line from multiple threads not cause serious slowdown?

c++ multithreading performance x86 false-sharing

multithreading

On a multicore x86, is a LOCK necessary as a prefix to XCHG?

multithreading x86 atomicity

multithreading

How is thread synchronization implemented, at the assembly language level?

multithreading assembly concurrency synchronization x86

multithreading

When should I use _mm_sfence _mm_lfence and _mm_mfence

c++ multithreading x86 intrinsics memory-barriers

multithreading

Does lock xchg have the same behavior as mfence?

multithreading assembly x86 cpu-architecture memory-barriers

multithreading

Why GCC does not use LOAD(without fence) and STORE+SFENCE for Sequential Consistency?

c++ multithreading gcc c++11 x86

multithreading

Implementing a ticket lock with atomics generates extra mov

c++ multithreading x86 locking

multithreading

Does an x86 CPU reorder instructions?

multithreading assembly x86 cpu-architecture memory-barriers

multithreading

Can compiler sometimes cache variable declared as volatile

c++ c multithreading x86 volatile

multithreading

What's the point of cache coherency?

multithreading caching concurrency x86 low-level

multithreading

Can x86 reorder a narrow store with a wider load that fully contains it?

multithreading assembly x86 locking x86-64

multithreading