atomic bomberman

--Start The following atomic classes are provided in the Java.util.concurrent.atomic package, they are thread-safe classes, but they are not implemented through synchronization and locking, and the operation of atomic variables becomes the hardware primitives provided by the platform for concurrent access.Atomicboolean--Atomic Boolean Atomicinteger--

) { lock lock; TMP = m_instance; if (tmp = = nullptr) { tmp = new Singleton;//Statement 1 ... Insert the memory Fence directive to ensure that when statement 2 executes, the object that TMP points to has completed the initialization constructor m_instance = tmp;//statement 2 } } return tmp; } Here we can see that when the m_instance pointer is null, we do a lock that ensures that the thread that

interrupt handler. In this scenario, the write-back operation of the interrupt handler control path is overwritten by the writeback on the system call control path, and the result is also incorrect.Second, the countermeasuresFor variables that have multiple kernel control paths for Read-modify-write, the kernel provides a special type atomic_t, which is defined as follows: typedef struct {int counter;} atomic_t; From the definition above, atomic_t is actually an int type of counte

Two cyanPersonal site: zhangerqing.cn email: [Email protected] Weibo: HTTP://WEIBO.COM/XTFGGEFAtomic IntroductionThe atomic package is another Java package specifically designed for thread safety under Java.util.concurrent and contains multiple atomic manipulation classes. This package provides a set of atomic variable classes. The basic feature is that in a mult

shared variable, the modification can also depend on the current value);2) The change quantity or the reference is not included in other invariant conditions;The most common error scenario for volatile is the use of volatile to implement concurrent i++; The reason for the error is that the operation relies on the current value of the I variable, which is based on the current value of the I variable, so that he relies on the current value of I. multiple threads execute i++; Updates are lost. For

Before talking about the process context, the interrupt context, and the atomic context, it is necessary to discuss the following two concepts:A--contextThe context is translated from English ContexT, which refers to an environment . in relation to the process, it is the environment when the process executes; In particular, variables and data, including all register variables, process open files, memory information, and so on.B--AtomicAtom (Atom) is

1. Non-blocking algorithm Non-blocking algorithms belong to concurrent algorithms that can safely derive their threads, not by locking, but through low-level atomic hardware native forms-such as comparisons and exchanges. The design and implementation of non-blocking algorithms is extremely difficult, but they provide better throughput and provide better defenses against survival problems such as deadlocks and priority inversion. Use the underlying a

First, the conceptAtomic operations provide instructions for atomic execution, with no interruption in the middle. Just as atoms are thought to be indivisible particles, atomic manipulation (atomic operation) is an inseparable operation.The self-adding 1 operation of a variable in C language seems simple, as if only one instruction is needed without interruption.

Deep parsing of Java Atomicinteger Atomic typesIn concurrent programming we need to ensure that the program can get the correct results when it is accessed concurrently by multiple threads, that is, thread safety. Thread safety is defined as follows: This class is thread-safe when multiple threads access a class, regardless of how the runtime environment is scheduled or how those threads will be executed alternately, and if no additional sync

Volatile variable In the Java language, volatile variables provide a lightweight synchronization mechanism in which volatile variables are used to ensure that updates to a variable are notified to other threads, and that volatile variables are not cached to registers or to places that are not visible to other processors. Therefore, when reading the volatile variable, it always returns the most recently written value, and the volatile variable is usually used to represent a state identity.

http://ifeve.com/java-atomic/Atomic Package Usage Guide in JavaThis article starts in the concurrent network, the square takeoffIntroductionJava provides the java.util.concurrent.atomic package from JDK1.5, allowing programmers to perform atomic operations without locking in a multithreaded environment. The bottom of the atom