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 ...
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...
it's specified by default). The volatile keyword in C++11 ISO Standard code is to be used only for hardware access; do not use it for inter-thread communication. For inter-thread communication, use mechanisms such asstd::atomic<
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 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.
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...
Because of this problem, most C compilers have been unable to make that sort of optimization in the past. To remove the problem (and other similar ones to do with when to write to where a pointer points), the keyword volatile was introduced. It tells the compiler that the object is subj...
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 one whose value might change spontaneously. That is, a volatile object might change ...
Incomputer programming, particularly in theC,C++,C#, andJavaprogramming languages, avariableorobjectdeclared with thevolatilekeywordusually has special properties related to optimization and/or threading. Generally speaking, thevolatilekeyword is intended to prevent the compiler from applying certai ...