One of the great use of volatile and const keyword together is at the time ofaccessing the GPIO registers. In the case of GPIO, its value will be changed by the ‘external factors’ (if a switch or any output device is attached with GPIO), if it is configured as an input. In that ...
在https://www.runoob.com/w3cnote/c-volatile-keyword.html 介绍 volatile 时有这样一段描述 “当使用 volatile 声明的变量的值的时候,系统总是重新从它所在的内存读取数据,即使它前面的指令刚刚从该处读取过数据”。然而,实际情况真的是每次都从内存中读取数据么?...
In computer programming, particularly in the C, C++, C#, and Java programming languages, the volatile keyword indicates that a value may change between different accesses, even if it does not appear to be modified. This keyword prevents an optimizing compiler from optimizing away subsequent reads ...
This article presents information on the use of volatile keywords in computer programming. According to the syntax rules of C and C++, the keyword volatile can appear anywhere that the keyword const can. Whereas a const object is one whose value the program can't change, a volatile object is...
The volatile keyword can be applied to fields of these types:Reference types. Pointer types (in an unsafe context). Note that although the pointer itself can be volatile, the object that it points to cannot. In other words, you cannot declare a "pointer to volatile." Simple types such as...
关于volatile 关键字 https://www.runoob.com/w3cnote/c-volatile-keyword.html 这里有详细描述。主要是为了防止优化编译带来的一些问题。注意:volatile 只作用于编译阶段,对运行阶段没有任何影响。 1.防止直接从寄存器中获取全局变量的值 //disorder_test.c ...
Thevolatilekeyword is a type qualifier used to declare that an object can be modified in the program by something such as the operating system, the hardware, or a concurrently executing thread. 但是C++11标准明确了volatile的定义,让他回归了当初设计的本源: ...
The proper use of C's volatile keyword is poorly understood by many programmers. This is not surprising, as most C texts dismiss it in a sentence or two. This article will teach you the proper way to do it.
参考资料 Java 理论与实践: 正确使用 Volatile 变量 Java并发编程:volatile关键字解析 深入理解Java内存模型(四)——volatile 聊聊并发(一)——深入分析Volatile的实现原理 Java Volatile Keyword volatile (computer programming) Java Memory Model 原创不易,打赏,点赞,在看,收藏,分享 总要有一个吧 ...
The actual definition and applicability of thevolatilekeyword is often misconstrued in the context of the C language. Although C++, C#, andJavashare the same keywordvolatilefrom C, there is a great deal of difference between the semantics and usefulness ofvolatilein each of these programming langua...