publicclassSemaphoreExample{//初始化最多2个线程同时进入, 最大允许3个线程privatestaticSemaphoresemaphore=newSemaphore(2,3);//用于不同的线程显示不同的颜色，方便观察结果privatestaticConsoleColor[]colors=newConsoleColor[5]{ConsoleColor.Red,Con
信号量（semaphore）：是一个同步对象，用于保持在0至指定最大值之间的一个计数值。当线程完成一次对该...
Mutex与信号量(Semaphore)在使用上有什么区别? Mutex就像一个C#锁(lock),但它可以跨多个进程工作。换句话说,Mutex可以是计算机范围的,也可以是应用程序范围的。 Mutex是一个同步原语,也可用于进程间同步。当两个或多个线程需要同时访问共享资源时,系统需要一个同步机制来确保一次只有一个线程使用该资源。Mutex是一个...
Semaphore的同步功能是所有 系统都支持的,而Mutex能否由其他进程释放则未定, 因此建议mutex只用于保护critical section。而semaphore则用于同步或者保护某变量。 关于semaphore和mutex的区别,网上有著名的厕所理论(http://koti.mbnet.fi/niclasw/MutexSemaphore.html): The Toilet Example (c) Copyright 2005, Niclas Wi...
Mutex VS. Semaphore Nearly all engineers seem to properly understand that a mutex is a binary flag used to protect a shared...mutex is analogous to the bathroom key owned by an urban coffee shop...To summarize with an example, here's how to use a mutex: /* Task 1 */ mutexWait(mute...
Example, say we have four toilets with identical locks and keys. The semaphore count - the count of keys - is set to 4 at beginning (all four toilets are free), then the count value is decremented as people are coming in. If all toilets are full, ie. there are no free keys left,...
The MicroC/OS-II Mutex design example demonstrates the use of MicroC/OS-II mutual exclusion semaphores (mutex). It also serves as a good starting point for other designs.
Semaphore: Is the number of free identical toilet keys. Example, say we have four toilets with identical locks and keys. The semaphore count - the count of keys - is set to 4 at beginning (all four toilets are free), then the count value is decremented as people are coming in. If al...
The previous example, the mutex, the code it owns, and the data it protects was enclosed in one function. The next example uses C++ features to accommodate many functions that use just one mutex to protect one data: /* CC thisfile.c use C++ to compile*/ #define _REENTRANT #include <...
The previous example, the mutex, the code it owns, and the data it protects was enclosed in one function. The next example uses C++ features to accommodate many functions that use just one mutex to protect one data: /* CC thisfile.c use C++ to compile*/ #define _REENTRANT #include <...