c ++ 11进程间原子和互斥体 [英] c++11 interprocess atomics and mutexes

问题描述

我有一个Linux程序，该程序产生多个进程（fork）并通过POSIX共享内存进行通信。我想让每个进程分配一个ID（0-255）。我的意图是在共享内存区域中放置一个位向量（初始化为零），并进行原子比较并交换一位以分配ID。

I have a Linux program which spawns several processes (fork) and communicates through POSIX Shared Memory. I'd like to have each process allocate an id (0-255). My intention is to place a bitvector in the shared memory region (initialized to zero) and atomically compare and swap a bit to allocate an id.

是否有c ++ 11种友好的方式做到这一点？我可以创建原子位集吗？我可以跨进程使用互斥吗？如何确保构造函数在所有进程中一次只能调用一次？

Is there a c++11-friendly way to do this? Can I create an atomic bitset? Can I use a mutex across processes? How do I assure that constructors get called once and only once across all processes?

推荐答案

C ++ 11线程原语（互斥体，原子等）是 threading 原语。他们对进程一无所知，也不是实现进程间通信的手段。

C++11 threading primitives (mutexes, atomics, etc) are threading primitives. They know nothing about processes, and they are not a means of achieving inter-process communication.

由于C ++ 11标准没有提及进程或进程间在通信过程中，此类原语放在进程共享内存（内存映射文件，某种进程外全局映射内存等）中的行为是不确定的。

As the C++11 standard makes no mention of processes or inter-process communication, the behavior of such primitives when placed in process-shared memory (a memory-mapped file, some kind of out-of-process globally mapped memory, etc) is undefined.

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