在两个进程之间同步访问共享内存中的数据[重复](Synchronized access to data in shared memory between two processes [duplicate])

 
 
 这个问题在这里已有答案： 
 
 
 
  
 如何在LynxOS / POSIX中同步对共享内存的访问？ 4个答案 
 
 
 
 
 我有两个进程在共享内存中有数据。 这些数据将通过这两个过程进行更新。 我正在寻找两个进程之间的一些锁定机制。 使用线程很容易拥有共享的互斥锁。 在我的例子中，我试图将互斥变量保存在共享内存中，然后两个进程都会使用它来锁定。 这不起作用。 如何在两个进程之间共享互斥锁。 有人说互斥量不能共享，使用信号量。 为什么互斥不能共享，但信号量可以？ 

 
 
This question already has an answer here:
 
 
 
  
 How do I synchronize access to shared memory in LynxOS/POSIX?  4 answers  
 
 
 
 
I have two processes that have data in shared memory. This data is going to be updated by both of these process. I was looking for some locking mechanism between two processes. With threads it was easy to have a shared mutex lock. In my case, I tried to save the mutex variable in the shared memory, which then will be used by both processes for locking. This didn't work though. How do I share a mutex between two processes. Some say mutexes cannot be shared, use semaphores. Why mutex cannot be shared but semaphores can be?

原文：https://stackoverflow.com/questions/37890740