A method and apparatus for a atomic operation is described. A method comprises receiving a first program unit in a parallel computing environment, the first program unit including a memory update operation to be performed atomically, the memory updat…

A method and apparatus for executing lock instructions speculatively in an out-of-order processor are disclosed. In one embodiment, a prediction is made whether a given lock instruction will actually be contended. If not, then the lock instruction ma…

A method and apparatus for verification of coherence for shared cache components in a system verification environment are provided. With the method and apparatus, stores to the cache are applied to a cache functional simulator in the order that they…

A data processor (104) is described. The data processor (104) is capable of decoding and executing a first instruction (212) of a first instruction set and a second instruction (213-219) in a second instruction set wherein the first instruction (212)…

A microprocessor contains an address generation unit, including a segment block, for loading descriptor data and a segment selector in a segment register. Two descriptor loads from a global descriptor table (GDT) and a local descriptor table (LDT) ar…

A computer-implemented method and apparatus in a computer system of processing data generated by a first application program in a second application program during runtime. During runtime, the first application program generates a record including a…

深入分析Volatile的实现原理 引言 在多线程并发编程中synchronized和Volatile都扮演着重要的角色,Volatile是轻量级的synchronized,它在多处理器开发中保证了共享变量的"可见性".可见性的意思是当一个线程改动一个共享变量时,另外一个线程能读到这个改动的值. 它在某些情况下比synchronized的开销更小.本文将深入分析在硬件层面上Inter处理器是怎样实现Volatile的,通过深入分析能帮助我们正确的使用Volatile变量. 术语定义 术…

1. 让我们首先了解下java 中 Volatile 关键字 Volatile可实现java内存模型当中的可见性, java内存模型的可见性: 可见性,是指线程之间的可见性,一个线程修改的状态对另一个线程是可见的.也就是一个线程修改的结果,另一个线程马上就能看到. 比如:用volatile修饰的变量,就会具有可见性.volatile修饰的变量不允许线程内部缓存和重排序,即直接修改内存.所以对其他线程是可见的. BUT Volatile 不保证原子性: just like this: volati…

An apparatus comprising a plurality of storage nodes comprising a plurality of corresponding storage disks and configured to store data in a distributed manner between the storage disks that achieves a Redundant Array of Independent Disks-0 (RAID0) l…

Apparatus for making legacy network elements transparent to IEEE 1588 Precision Time Protocol operation. Network elements are wrapped by device(s) capable of providing either transparent clock or boundary clock operation. In one embodiment, smart int…