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In C and C++, volatile is a type qualifier, like const, and is a part of a type (e.g. the type of a variable or field). The behavior of the volatile keyword in C and C++ is sometimes given in terms of suppressing optimizations of an optimizing compiler: 1- don't remove existing volatile reads and writes, 2- don't add new volatile reads and writes, and 3- don't reorder volatile reads and writes.
const was then adopted in C as part of standardization, and appears in C89 (and subsequent versions) along with another type qualifier, volatile, which was invented by the ANSI C standard committee (X3J11). [7] volatile appeared by 1985; [8] and an early use was in compiling the UNIX kernel for MIPS, to allow optimized compiling by preventing ...
The C language provides basic arithmetic types, such as integer and real number types, and syntax to build array and compound types. Headers for the C standard library , to be used via include directives , contain definitions of support types, that have additional properties, such as providing storage with an exact size, independent of the ...
Which registers the called function must preserve for the caller (also known as: callee-saved registers or non-volatile registers) How the task of preparing the stack for, and restoring after, a function call is divided between the caller and the callee; This is intimately related with the assignment of sizes and formats to programming-language ...
A snippet of C code which prints "Hello, World!". The syntax of the C programming language is the set of rules governing writing of software in C. It is designed to allow for programs that are extremely terse, have a close relationship with the resulting object code, and yet provide relatively high-level data abstraction.
In C and C++, the volatile keyword was intended to allow C and C++ programs to directly access memory-mapped I/O. Memory-mapped I/O generally requires that the reads and writes specified in source code happen in the exact order specified with no omissions. Omissions or reorderings of reads and writes by the compiler would break the ...
From January 2008 to March 2010, if you bought shares in companies when Jerome B. York joined the board, and sold them when he left, you would have a 12.7 percent return on your investment, compared to a -20.6 percent return from the S&P 500.
"Volatile values primarily arise in hardware access (memory-mapped I/O), where reading from or writing to memory is used to communicate with peripheral devices, and in threading, where a different thread may have modified a value." This needs to specify this is for java only. For C/C++ volatile is not used for multithreading.