信号量
- 网络semaphore;Mutex;sem
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在内部,有一种保护每个视图的信号量,它称为Collection信号量。
Internally , there is a semaphore protecting each view called the Collection semaphore .
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在Linux中,我们使用sempost()来释放信号量。
In Linux , sem_post () is used to release semaphore .
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value(信号量计数器)是这个信号量的初始值。
Value ( semaphore count ) is the initial value of the semaphore .
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在进程之间,可以使用SystemV信号量。
Between processes , System V semaphores can be used .
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记住,超时操作在SystemV信号量中并不适用。
Remember that the timeout option is not available in System V semaphore .
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key应该指向想要打开的信号量集的key值。
Key should point to the semaphore set key , which you want to open .
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key是一个惟一的标识符,不同的进程使用它来标识这个信号量集。
The key is a unique identifier that is used by different processes to identify this semaphore set .
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关于每个SystemV信号量的原型,请参阅本文中有关信号量一节的内容。
Refer to the section on semaphores in this article for the prototype for each of these System V semaphores .
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在Linux中,semwait()用来获取对信号量的访问。
In Linux , sem_wait () is used to acquire the semaphore access .
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Linux内核中信号量机制的研究与实现
Research and Realization on Semaphore Mechanism in Linux Kerne
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在Linux中,进程之间有名事件对象所实现的功能可以使用SystemV信号量实现。
In Linux , the named event objects functionality between processes can be achieved by using a System V semaphore .
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为了在Linux实现与Windows中有名事件对象相同的功能,可以使用SystemV信号量或信号。
To achieve functionality of named event objects in Linux , System V semaphore or signals can be used .
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基于信号量的Linux多线程同步研究
Research on Linux Multithread Synchronization Based on Semaphore
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当然,解决方案是使用finally来释放信号量许可证,这是一个很简单却容易被遗忘的方法。
The solution , of course , is to use finally to release the semaphore permit ; an easy enough but all-too-often-forgotten approach .
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Debugcapturetimeout=10给每个信号量超时消息加时间戳。
Debug_capture_timeout = 10 time stamps each semaphore timeout message .
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“showstat”命令将报告信号量超时信息。
The'show stat'command will record semaphore timeout information .
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信号量机制在Linux中的实现
Implementation of Semaphore Mechanism in Linux
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Windows信号量是一些计数器变量,允许有限个线程/进程访问共享资源。
Windows semaphores are count variables allowing a limited number of threads / processes to access the shared resource .
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定义在kernel/semaphore.c中,它用于获取信号量sem。
Defined in kernel / semaphore . c , it is used to acquire the semaphore sem .
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注意,在SystemV信号量中,key被用来惟一标识信号量;在Windows中,信号量是使用一个名称来标识的。
Notice that in System V semaphores , key is used to uniquely identify the semaphore ; in Windows , the semaphore is identified by a name .
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利用信号量、消息等系统功能提高CPU的使用效率。
It improves the efficiency of CPU usage by providing semaphore , message and other system functions .
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它的核心原理是,一个信号量是一个单精度的整形数值,此数值结合了一双函数集称为P和V。
At its core , a semaphore is a single integer value combined with a pair of functions that are typically called P and V.
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用信号量机制与PV操作解决进程同步互斥问题的方法Windows下的线程互斥和同步
Achieve Mutual Exclusion in Process Synchronization with Signal Mechanism and PV Operation Line Procedure Mutually-exclusive and Synchronization under Windows
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如果并没有请求上一个信号量计数器的值,那么这个参数可以是NULL。
The parameter can be NULL if the previous semaphore count value is not required .
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等待函数中的超时:当在一个等待函数中使用时,可以为Windows信号量对象指定超时值。
Timeout in wait functions : When used in one of the wait functions , timeout value can be specified for Windows semaphore objects .
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在Linux中,条件变量和POSIX信号量都是自动重置类型的。
In Linux , conditional variable and POSIX semaphores are of the auto-reset type .
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TIMEOUT=nDomino服务器控制台报告信号量超时消息的速率(毫秒数)。
TIMEOUT = n Rate at which the Domino server console reports semaphore timeout messages in milliseconds .
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在Linux上,在相同进程的不同线程之间,则只使用POSIX信号量。
On Linux , POSIX semaphores are used only between the threads of same process .
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在Linux中,POSIX信号量和SystemV信号量也都是异步的,不过pthreads条件变量不是异步的。
In Linux , POSIX semaphores and System V semaphores are asynchronous but pthreads conditional variables are not asynchronous .
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本文给出了信号量的具体含义并提出用P,V原语实现进程互斥的一般模型。
In this paper , We give specific meaning of semaphores and put forward a general model to achieve process mutual exclusion with P , V primitive .