volatile int

If a variable foo is not declared as volatile, then in the case of a compiler optimization, if you use Foo for the second time, the code generated by the compiler may use the value already stored in the register instead of "reload" the variable from

On the Intel type of X86 processors including AMD, increasingly there are more CPU cores or processors running in parallel. In the old days when there was a single processor, the operation: ++ I; Wocould be thread safe because it was one machine

1. What is Atomic? The word Atomic has a relationship with atoms, which were once considered to be the smallest unit of matter. Atomic in a computer means that it cannot be divided into several parts. If a piece of code is considered Atomic, it

  # Define utxho * (volatile int *) 0x7f005020)# Define utrstat0 * (volatile int *) 0x7f005010)# Define urxh0 * (volatile int *) 0x7f005024) # Define gpacon * (volatile int *) 0x7f008000)# Define ubrdiv0 * (volatile int *) 0x7f005028)# Define

How do I get the system to load my own written driver? Two ways: 1, add the registration key under [Hkey_local_machine/drivers/builtin]. 2. Call Activatedeviceex in the application. In some files, a semicolon is used to express comments, such

A variable defined as volatile means that this variable may be unexpectedly changed, so that the compiler will not assume the value of this variable. Precisely, the optimizer must carefully re-read the value of this variable every time when using

In some website applications that require the Real-Time Message function, in addition to the client polling request server to obtain the message, there is also a solution that pushes messages through the comet persistent connection. Obviously, the

First, start with the atomic operationStart with a relatively simple atomic (Java.util.concurrent is a queue-based contract and the queue, in many cases, uses the atomic operation, so begin here first).In many cases we just need a simple, efficient,

Special tools and technologies-inherent non-portable features [on]Non-portable features that C + + inherits from the C language: bit fields and volatile qualifiers . These features make it easier to communicate directly with the hardware

Sharing data issues between multiple threadsFirst, SynchronizedkeywordThe word atomic is not related to "atoms", it was previously thought to be the smallest unit of matter and could no longer be disassembled into smaller parts. When a method is

A variable defined as volatile means that this variable may be unexpectedly changed, so that the compiler will not assume the value of this variable. Precisely, the optimizer must carefully re-read the value of this variable every time when using

The role of volatile ( Http://blog.21ic.com/user1/2949/archives/2007/35599.html) 173 recommendation A variable defined as volatile means that this variable may be unexpectedly changed, so that the compiler will not assume the value of this variable.

Concurrency risks---------------------------------------- Solve 11 common problems in multi-threaded codeJoe Duffy Original article: http://msdn.microsoft.com/zh-cn/magazine/cc817398.aspx This article introduces the following:

Volatile affects compiler compilation results. It is pointed out that volatile variables may change at any time. computation related to volatile variables should not be optimized to avoid errors, (VC ++ will compile and optimize the release

Title: Talking about volatile and multithreading 2011-04-19 22:49:17 Recently looked at the miscellaneous, picked some people's notes!With the increasing popularity of multicore, more and more programs will be parallelized by

Because often see volatile this keyword, think of themselves not very clear about this volatile, just know that it shows that variables are easy to change and prevent compiler optimization. So on the Internet to find some other friends of the

Data sharing among multiple threads1. The word atomic of Synchronized has nothing to do with "atom". It was once considered to be the smallest unit of matter and cannot be split into smaller parts. When a method is declared as synchronized, the

A variable defined as volatile means that this variable may be unexpectedly changed, so that the compiler will not assume the value of this variable. Precisely, the optimizer must carefully re-read the value of this variable every time when using

Volatile affects compiler compilation results. It is pointed out that volatile variables may change at any time. computation related to volatile variables should not be optimized to avoid errors, (VC ++ will compile and optimize the release

Transferred from: http://msdn.microsoft.com/zh-cn/magazine/cc817398.aspxconcurrency dangerous solutions 11 common problems in the multi-thread code Joe Dudu y This article introduces the following: Basic concurrency concepts