A Fetch&Inc object stores a non-negative integer and supports a single operation, fi , that returns the value of the object and increments it. Such objects are used in many asynchronous shared memory algorithms,
' This question is partially answered in this article by presenting a group mutual exclusion algorithm using fetch-and-increment instructions. The algorithm is simple and scalable. 展开▼ 机译:组互斥(GME)问题(也称为房间同步问题)出现在需要并发数据共享的各种实际应用中。组互斥旨在实现对共享资源(...
Elements of Datapath for the fetch and increment The first element we need: a memory unit to store the instructions of a program and supply instructions given an address. The program counter (PC), which is a register that holds the address of the current instruction. Lastly, we will need a...
通过enqueue_index = putIndex.getAndIncrement(),得到这次的enqueue_index, 通过enqueue_index / CELLS_SIZE 得到nodeId,通过node链表和nodeId获取node, 通过enqueue_index % CELLS_SIZE 得到该node上的偏移. 然后尝试CAS塞入数据。 Java中的ObsFreeQueue<T>,如下: public class ObsFreeQueue<T> { public ObsFre...
#include <sys/atomic_op.h>int fetch_and_add (addr,value)atomic_paddr;intvalue;longfetch_and_addlp (addr,value)atomic_laddr;ulongvalue; Descrição As subroutinesfetch_and_addefetch_and_addlpincrementam uma palavra em uma única operação atômica. Esta operação éútil quando um...
采用排队锁和fetch_and_increment原语重新实现栅栏同步,并将它们分别与采用旋转锁实现的栅栏同步进行性能比较。 免费查看参考答案及解析 题目: [单选] 游标的哪一种属性指示fetch语句是否从活动集中返回行,如未能返回行,则此属性的值为true?()A.%FOUNDB.%NOTFOUNDC.%ROWCOUNTD.%ISOPEN 免费查看参考答案及解析 ...
simply by incrementing the turn such that the next waiting thread (if there is one) can now enter the critical section. Note one important difference with this solution versus our previous attempts: it ensures progress for all threads. Once ...
refcount_increment函数使用__sync_fetch_and_add原子操作将ref_count增加1。 减少引用计数: refcount_decrement函数使用__sync_fetch_and_sub原子操作将ref_count减少1。如果减少后ref_count的值为0,则释放对象。 主函数: 在main函数中创建对象,增加引用计数,最后减少引用计数,直到对象被释放。
#include <sys/atomic_op.h>int fetch_and_add (addr,value)atomic_paddr;intvalue;longfetch_and_addlp (addr,value)atomic_laddr;ulongvalue; Description Thefetch_and_addandfetch_and_addlpsubroutines increment one word in a single atomic operation. This operation is useful when a counter variable ...
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