There had to be some way of breaking through the memory barrier!

Explicit memory barriers may also be used for this purpose.

In such environments explicit use of memory barriers is not generally necessary.

Memory barrier instructions only address reordering effects at the hardware level.

That said, the following paragraph offers a glimpse of some memory barriers which exist in contemporary products.

On most non-x86 architectures, explicit memory barrier or atomic instructions (as in the example) must be used.

He hesitated, then said, lying, "We're going to put you under hypnosis and try to break through your memory barrier.

As a result, memory barriers are required.

The keyword does not guarantee a memory barrier to enforce cache-consistency.

The biggest advantage of the 64-bit version is breaking the 4 gigabyte memory barrier, which 32-bit computers cannot fully access.

It breaks the 640-kilobyte memory barrier, which will allow it to run larger and presumably more useful applications.

Moreover, the entire notion of a race condition is entirely defined over the order of operations with respect to these memory barriers.

When more than one memory barrier instruction is available it is important to consider that the cost of different instructions may vary considerably.

Memory-mapped I/O is the cause of memory barriers in older generations of computers.

Some architectures, including the ubiquitous x86/x64, provide several memory barrier instructions including an instruction sometimes called "full fence".

Some compilers support builtins that emit hardware memory barrier instructions:

The conventional wisdom is that using memory barriers correctly requires careful study of the architecture manuals for the hardware being programmed.

These primitives are usually implemented with the memory barriers required to provide the expected memory visibility semantics.

I gain considerable added time as Echo One experiences a rush of memories formerly walled off by the memory barriers.

Memory barriers are typically used when implementing low-level machine code that operates on memory shared by multiple devices.

Such processors invariably give some way to force ordering in a stream of memory accesses, typically through a memory barrier instruction.

Allowing this relaxation makes cache hardware simpler and faster but leads to the requirement of memory barriers for readers and writers.

This function returns the new value, and also executes any memory barrier instructions required for a given CPU architecture.

Weak consistency (Reads and Writes are arbitrarily reordered, limited only by explicit memory barriers)

Memory barriers are necessary because most modern CPUs employ performance optimizations that can result in out-of-order execution.