C programmers have often taken volatile to mean that the variable could be changed outside of the current thread of execution; as a result,they are sometimes tempted to use it in kernel code when shared data st
Now both pointers become a pointer to a volatile integer variable. In this situation, the compiler assumes that the value of the variable, which is pointed by a pointer can change unexpectedly at any time. So whenever we access *piData, the compiler is always aware of unexpected changes in ...
In C#, "volatile" means not only "make sure that the compiler and the jitter do not perform any code reordering or register caching optimizations on this variable". It also means "tell the processors to do whatever it is they need to do to ensure that I am reading the latest value, ev...
0x000000010f2a462e: mov$0xa,%edi 0x000000010f2a4633: mov %edi,0xc(%rsi)0x000000010f2a4636: lock addl$0x0,0xffffffffffffffc0(%rsp);*putfield value{reexecute=0rethrow=0return_oop=0};- com.createchance.volatilelearn.ReadWriteVolatile::writeMethod@3(line 17) 可以看到,这里确使用了 loc...
There are times when its use is required for correct operation of C/C++ programs. In general, whenever a variable may be altered asynchronously, such as by a signal handler or mapped hardware, the variable must be declared to be volatile. Since volatile prevents re-using values in registers,...
When an atomic load is performed on a shared variable, it reads the entire value as it appeared at a single moment in time. 1. 高级语言与汇编指令的映射 高级语言(如:C/C++),被编译为汇编语言,才能够被执行。因此,高级语言与汇编语言之间,存在着几种简单的映射关系。 •Simple Write –Write ...
Volatile variable in a DLL - why? Subscribe More actions michael_green Beginner 06-05-2014 06:53 PM 2,981 Views Hi All, This problem is solved, but I would greatly value any insights or explanations any members of this group could provide. A user discovered that an old, ...
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In C, you use the type qualifier const to prevent code in an application from assigning a new value to a variable. In an application where an external actor (for example, a hardware device) can manipulate the value of a variable, you use the keyword volatile to prevent a compiler from ...
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 certain optimizat...