mutual exclusion rule

简明释义

互斥现象则

英英释义

例句

1.In a multi-threaded application, the mutual exclusion rule 互斥规则 ensures that only one thread can access a resource at a time.

在一个多线程应用中，互斥规则 mutual exclusion rule 确保只有一个线程可以同时访问资源。

2.The operating system enforces the mutual exclusion rule 互斥规则 to manage access to shared memory.

操作系统执行互斥规则 mutual exclusion rule 来管理对共享内存的访问。

3.To ensure data integrity, the team applied the mutual exclusion rule 互斥规则 during the file writing process.

为了确保数据完整性，团队在文件写入过程中应用了互斥规则 mutual exclusion rule。

4.The database uses the mutual exclusion rule 互斥规则 to prevent two transactions from modifying the same record simultaneously.

数据库使用互斥规则 mutual exclusion rule 来防止两个事务同时修改同一记录。

5.When designing the software, we implemented the mutual exclusion rule 互斥规则 to avoid race conditions.

在设计软件时，我们实施了互斥规则 mutual exclusion rule 以避免竞争条件。

作文

The concept of mutual exclusion rule is a fundamental principle in computer science and systems design, particularly in the context of concurrent programming. This rule ensures that when multiple processes or threads are accessing shared resources, only one can access the resource at any given time. This is crucial for maintaining data integrity and preventing race conditions, which can lead to unpredictable behavior in software applications.To better understand the mutual exclusion rule, consider a scenario where two threads are trying to update the same bank account balance simultaneously. Without proper synchronization mechanisms in place, both threads might read the current balance at the same time, make their calculations, and then write back their results. This could result in incorrect balances being recorded, as one thread may overwrite the changes made by the other. Thus, the mutual exclusion rule plays a vital role in ensuring that such conflicts do not occur.There are several techniques to implement the mutual exclusion rule. One common method is through the use of locks. A lock is a synchronization primitive that allows only one thread to access a particular section of code or resource at a time. When a thread wants to enter a critical section of code (the part that accesses shared resources), it must first acquire the lock. If another thread has already acquired the lock, the requesting thread must wait until the lock is released. This ensures that only one thread can execute the critical section at any time, thereby adhering to the mutual exclusion rule.Another approach to enforce the mutual exclusion rule is through semaphores. A semaphore is a signaling mechanism that can control access to a resource by multiple threads. It maintains a count of the number of available resources. If a thread wishes to access a resource, it decreases the semaphore count; if the count reaches zero, no more threads can access the resource until it is released. This method can be particularly useful in scenarios where multiple instances of a resource are available, but still requires adherence to the mutual exclusion rule to prevent conflicts.In addition to locks and semaphores, there are other advanced techniques like monitors and message passing that also ensure compliance with the mutual exclusion rule. Monitors encapsulate shared resources and provide synchronization automatically when threads attempt to access them. Message passing, on the other hand, avoids shared memory altogether, allowing threads to communicate via messages, thus inherently avoiding issues related to mutual exclusion.Despite its importance, implementing the mutual exclusion rule can introduce complexity into software design. Developers must carefully consider how and when to synchronize access to shared resources, as improper implementation can lead to deadlocks, where two or more threads are waiting indefinitely for each other to release resources. Therefore, understanding and applying the mutual exclusion rule is essential for creating robust and efficient software systems.In conclusion, the mutual exclusion rule is a critical concept in the realm of concurrent programming. It ensures that shared resources are accessed in a controlled manner, preventing data corruption and other concurrency issues. By utilizing various synchronization techniques such as locks, semaphores, and monitors, developers can effectively manage access to shared resources, adhering to the principles of the mutual exclusion rule. As software continues to evolve and become more complex, the importance of understanding and applying this rule will only grow, making it an essential area of study for computer scientists and software engineers alike.

互斥规则是计算机科学和系统设计中的一个基本原则，特别是在并发编程的背景下。该规则确保当多个进程或线程访问共享资源时，在任何给定时间只有一个可以访问该资源。这对于维护数据完整性和防止竞争条件至关重要，因为竞争条件可能导致软件应用程序中不可预测的行为。为了更好地理解互斥规则，考虑一个场景，其中两个线程试图同时更新同一银行账户余额。如果没有适当的同步机制，两个线程可能会同时读取当前余额，进行计算，然后写回结果。这可能导致记录不正确的余额，因为一个线程可能会覆盖另一个线程所做的更改。因此，互斥规则在确保此类冲突不会发生方面发挥了重要作用。实现互斥规则的几种技术之一是使用锁。锁是一种同步原语，允许一次只有一个线程访问特定的代码段或资源。当线程希望进入临界区（访问共享资源的部分）时，它必须首先获取锁。如果另一个线程已经获取了锁，请求线程必须等待直到锁被释放。这确保了只有一个线程可以在任何时候执行临界区，从而遵循互斥规则。实施互斥规则的另一种方法是通过信号量。信号量是一种信号机制，可以控制多个线程对资源的访问。它维护可用资源数量的计数。如果线程希望访问资源，它会减少信号量计数；如果计数达到零，则在释放之前没有其他线程可以访问该资源。这种方法在可用多个资源实例的情况下特别有用，但仍然需要遵循互斥规则以防止冲突。除了锁和信号量，还有其他高级技术，如监视器和消息传递，也确保遵守互斥规则。监视器封装共享资源，并在线程尝试访问它们时自动提供同步。另一方面，消息传递完全避免共享内存，允许线程通过消息进行通信，从而固有地避免与互斥相关的问题。尽管互斥规则的重要性，实施它可以给软件设计带来复杂性。开发人员必须仔细考虑如何以及何时同步对共享资源的访问，因为不当实施可能导致死锁，即两个或多个线程无限期地等待彼此释放资源。因此，理解和应用互斥规则对于创建健壮和高效的软件系统至关重要。总之，互斥规则是并发编程领域中的一个关键概念。它确保以受控方式访问共享资源，防止数据损坏和其他并发问题。通过利用各种同步技术，如锁、信号量和监视器，开发人员可以有效地管理对共享资源的访问，遵循互斥规则的原则。随着软件的不断发展和变得更加复杂，理解和应用这条规则的重要性只会增加，使其成为计算机科学家和软件工程师必修的研究领域。