atomic bomberman

1. Atomic and non-atomic properties1.1>oc nonatomic and atomic two choices when defining attributes(1) Atomic: Atomic attribute, locking for setter method (default is Atomic)(2) Nonatomic: Non-

the source code file, error_log only opens the file in O_APPEND mode, and then writes the buf. well, there is no shadow of the file lock. The problem is also obvious. the write may be called multiple times, so it is basically determined that msg is not necessarily output by the atom. Multiple writes make this problem more serious. Multiple write operations cannot guarantee atomic operations. what about a single write operation? 1. from: man write

Code:#import "ViewController.h"externuint64_t Dispatch_benchmark (size_t count,void(^block) (void));@interfaceViewcontroller ()//Atomic Properties-Mutex implementation@property (Strong, nonatomic) NSObject *obj1;//Atomic Properties-spin lock implementation@property (Strong, atomic) NSObject *Obj2;@end@implementationViewcontroller- (void) Touchesbegan: (nonnull ns

1. OverviewThis article is the first article of the series without lock synchronization, mainly discusses the atomic in C++11.We know the introduction of mutexes in C++11 and the convenience of elegant lock_guard. But sometimes what we want is a higher performance lock-free implementation, let's talk about the new atomic Operation class atomic in C++11, which we

, the method returns immediately, and if you need to use a value computed by this thread after calling the Start method, you must use the Join method. If you do not use the Join method, you cannot guarantee that the thread will run out when a statement after the Start method is executed. After the Join method is used, the program does not go down until the thread exits. public class Jointhread extends Thread {public static int n = 0; Static synchronized Void Inc () {n++; pu

What is atomic manipulation? Atomic operation: is not interrupted when performing an operation. The problem of Linux atom operation originates from interrupts, process preemption and concurrent execution of programs in multi-core SMP systems. The operation of the critical section can be locked to ensure atomicity, and for global variables or static variable operations, it is necessary to rely on the

Http://hi.baidu.com/yicun05/blog/item/ce8cf118cec87172dbb4bdd3.html 1: What is an atomic operation? The minimum unit of thread execution, which cannot be interrupted. 2: What is volatile? A common variable is cached in both the primary memory and the temporary memory of the current thread.Unified and need to be synchronized. If the synchronization is not completed, if other threads read the value from the primary memory, the synchronization exception

This package provides a set of atomic variable classes. The basic feature is that in a multithreaded environment, when there are multiple threads executing the methods contained by instances of these classes at the same time, there is exclusivity, that is, when a thread enters the method and executes the instruction, it is not interrupted by another thread, and the other thread is like a spin lock until the method executes. It is only a logical unders

In order to achieve thread safety, we are in front of the lock to ensure the atomic nature, then there is no lock can be implemented thread safety. It starts with the optimistic lock and the pessimistic lock.1. Pessimistic lock. The so-called pessimistic lock, is the access to resources, by default is that there will be resource preemption, so each time to lock, only one thread to execute. Optimistic lock. Another kind of lock policy, the default reso

Java. util. Concurrent. Atomic. Atomic * atomic class and volatile keyword are two common methods in Java to process data shared read/write under multiple threads. The two seem to be the same, but they are quite different in practical applications. The volatile keyword is a write lock implemented by local code. It only ensures that a thread is writing data. To sp

CAS atomic Operations--compare Set, or Compare Swap, now almost all CPU instructions support CAS atomic operations, X86 corresponding to CMPXCHG assembly instructions.You should remember the concept of "atomic manipulation" inside the operating system, where an operation is atomic (

Faster Atomic class: Longadder Everyone to the basic realization mechanism of the atomicinteger should be more understanding, they are in a dead loop, and constantly try to modify the target value, know the success of the modification, if the competition is not fierce, then the probability of successful modification is very high, otherwise, the probability of modification failure is very high, in a large number of changes failed, These

In this section, we begin to discuss array atomic operations and some other atomic operations.Atomicintegerarray/atomiclongarray/atomicreferencearray 's API is similar, select a representative atomicintegerarray to describe these issues.int get (int i)Gets i The current value of the position. Obviously, because this is an array operation, there is an index cross-boundary problem (Indexoutofboundsexception e

Atomic and nonatomic are used to determine whether the compiler-generated getter and setter are atomic operations. 　　Atomic When setting the @property property of a member variable, the default is atomic, which provides multithreading security. In a multithreaded environment, at