A memory barrier is a special processor instruction that imposes restrictions on the order in which memory accesses become visible to other processors/cores in a multi-processor or multi-core system.
As far as I have understood, mfence is a hardware memory barrier while asm volatile ("" : : : "memory") is a compiler barrier. …
gcc x86 memory-barriersSome languages provide a volatile modifier that is described as performing a "read memory barrier" prior to reading the memory …
multithreading volatile memory-barriersIn "C# 4 in a Nutshell", the author shows that this class can write 0 sometimes without MemoryBarrier, though I can't reproduce …
c# .net multithreading thread-safety memory-barriersOften in internet I find that LFENCE makes no sense in processors x86, ie it does nothing , so instead MFENCE …
assembly x86 x86-64 atomic memory-barriersThere is an article at: http://lwn.net/Articles/378262/ that describes the Linux kernels circular buffer implementation. I have some …
linux concurrency circular-buffer memory-barriersI'm writing a multithreaded application in c++, where performance is critical. I need to use a lot of locking while …
c++ assembly x86 memory-barriers spinlockIt is easy to set memory barriers on the kernel side: the macros mb, wmb, rmb, etc. are always in …
c++ c multithreading lock-free memory-barriersI have a shared memory between multiple processes that interpets the memory in a certain way. Ex: DataBlock { int counter; …
c++ linux shared-memory memory-barriers stdatomicC# 4 in a Nutshell (highly recommended btw) uses the following code to demonstrate the concept of MemoryBarrier (assuming A and …
c# multithreading thread-safety shared-memory memory-barriersI'm a newbie when it comes to this. Could anyone provide a simplified explanation of the differences between the following …
c++ windows visual-c++ memory-barriers