semaphore

简明释义

英[ˈseməfɔː(r)]美[ˈseməfɔːr]

n. 信号标，旗语；臂板信号装置

v. 打旗语，发信号

复 数 s e m a p h o r e s

第 三 人 称 单 数 s e m a p h o r e s

现 在 分 词 s e m a p h o r i n g

过 去 式 s e m a p h o r e d

过 去 分 词 s e m a p h o r e d

英英释义

单词用法

同义词

反义词

例句

1.The timeout option is not available in the POSIX semaphore.

在POSIX信号中不能使用超时选项。

2.Use different types of semaphore classes

使用不同类型的信号量类

3.Linux POSIX semaphores use sem_post to post an event semaphore.

LinuxPOSIX信号量使用sem_post来发出一个事件信号量。

4.The 'show stat' command will record semaphore timeout information.

“showstat”命令将报告信号量超时信息。

5.In Linux, the call sem_init also creates a POSIX semaphore.

在Linux中，sem_init调用会创建一个POSIX信号。

6.Linux POSIX semaphores use sem_destroy to destroy the unnamed semaphore.

LinuxPOSIX信号使用sem_destroy来销毁无名称的信号。

7.Type of semaphore: Windows provides named and unnamed semaphores.

信号量的类型：Windows提供了有名(named)信号量和无名(unnamed)信号量。

8.The train station used a large semaphore to signal the arrival and departure of trains.

火车站使用一个大型信号旗来指示火车的到达和离开。

9.In programming, a semaphore is often used to control access to a common resource.

在编程中，信号量通常用于控制对公共资源的访问。

10.The captain communicated with the crew using semaphore flags during the drill.

在演习期间，船长使用信号旗与船员进行沟通。

11.The semaphore system helped prevent collisions between ships in the busy harbor.

该信号系统帮助防止了繁忙港口中船只之间的碰撞。

12.During the race, the officials used semaphore signals to communicate important information to the drivers.

在比赛期间，官员们使用信号向驾驶员传达重要信息。

作文

In the realm of communication, various methods have been developed to convey messages over distances. One such method is the use of a system known as semaphore, which employs visual signals to represent letters or numbers. The term semaphore originates from the Greek words 'sema,' meaning sign, and 'phorein,' meaning to carry. This fascinating technique has been utilized in different contexts, including maritime navigation and military operations, where clear and immediate communication is crucial. The basic principle of semaphore involves the use of flags, lights, or mechanical devices that can be positioned in specific ways to signify particular messages. For instance, in maritime settings, sailors often use flag semaphore to communicate with one another when they are out of earshot. Each flag's position corresponds to a letter or number, allowing for the transmission of complex messages without the need for verbal communication. This method is especially beneficial in situations where noise levels are high or when electronic communication is not feasible. Historically, semaphore systems have played a significant role in the advancement of communication technology. In the late 18th century, Claude Chappe invented the optical semaphore system, which consisted of a series of towers equipped with movable arms. These towers were strategically placed to allow operators to send messages across long distances by adjusting the position of the arms to create different symbols. This innovation greatly improved the speed and efficiency of communication during that era, paving the way for modern telecommunication systems. In addition to its historical significance, semaphore continues to be relevant today, particularly in the fields of transportation and safety. For example, railway systems often use semaphore signals to indicate track conditions and train movements. These signals, which can be seen from a distance, help ensure the safe operation of trains by providing clear instructions to conductors and engineers. Moreover, the concept of semaphore has also transcended its traditional uses and found applications in computer science. In programming, a semaphore is a variable or abstract data type used to control access to a common resource in concurrent systems. It helps manage the execution of processes, ensuring that multiple threads can operate smoothly without interfering with one another. This modern interpretation of semaphore highlights the versatility and enduring importance of the concept in various fields. In conclusion, the term semaphore represents more than just a method of communication; it embodies the evolution of human interaction across time and technology. From its origins in visual signaling to its applications in contemporary programming, semaphore remains a vital tool for conveying information efficiently and effectively. Understanding the significance of semaphore allows us to appreciate the intricate systems we rely on daily, both in our personal lives and in broader societal functions.

在通信领域，各种方法被开发出来以便在距离上传达信息。其中一种方法是使用一种称为信号旗的系统，它利用视觉信号来表示字母或数字。术语信号旗源自希腊词“sema”，意为标志，以及“phorein”，意为携带。这种迷人的技术在不同的环境中得到了应用，包括海洋导航和军事行动，在这些场合，清晰而及时的沟通至关重要。 信号旗的基本原理涉及使用旗帜、灯光或机械装置，这些装置可以以特定的方式定位，以表示特定的信息。例如，在海洋环境中，水手们常常使用旗帜信号旗与彼此沟通，当他们听不见对方时。每面旗帜的位置对应一个字母或数字，使得在无需口头交流的情况下能够传递复杂的信息。这种方法在噪音水平较高或电子通信不可行的情况下尤其有益。 历史上，信号旗系统在通信技术的发展中发挥了重要作用。在18世纪末，克劳德·查普发明了光学信号旗系统，该系统由一系列配备可移动臂的塔楼组成。这些塔楼被战略性地放置，以便操作员通过调整臂的位置来发送信息，从而创建不同的符号。这一创新大大提高了那个时代通信的速度和效率，为现代电信系统铺平了道路。 除了其历史意义外，信号旗在今天仍然具有相关性，特别是在交通和安全领域。例如，铁路系统经常使用信号旗信号来指示轨道条件和列车运动。这些信号可以从远处看到，有助于通过向列车长和工程师提供明确的指示，确保列车的安全运行。 此外，信号旗的概念还超越了其传统用途，并在计算机科学中找到了应用。在编程中，信号旗是一个变量或抽象数据类型，用于控制并发系统中对公共资源的访问。它帮助管理进程的执行，确保多个线程可以顺利运行，而不会互相干扰。这种对信号旗的现代解释突显了这一概念在各个领域的多样性和持久重要性。 总之，术语信号旗代表的不仅仅是一种通信方法；它体现了人类互动在时间和技术上的演变。从其在视觉信号中的起源到其在当代编程中的应用，信号旗仍然是有效和高效传达信息的重要工具。理解信号旗的重要性使我们能够欣赏我们日常依赖的复杂系统，无论是在个人生活中还是在更广泛的社会功能中。