c++ - boost::interprocess 映射线程安全

Question

现在查看此链接:

http://www.boost.org/doc/libs/1_56_0/doc/html/interprocess/quick_guide.html#interprocess.quick_guide.qg_interprocess_map

我打算用它来映射 UNIX 系统上进程之间的内存。我是否必须为多个进程写入/读取实现自己的保护，或者它是否已经内置？文档在这方面似乎不清楚。

Answer 1

您需要同步对共享内存中容器的所有访问。

例如here :

As mentioned before, the ability to shared memory between processes through memory mapped files or shared memory objects is not very useful if the access to that memory can't be effectively synchronized. This is the same problem that happens with thread-synchronization mechanisms, where heap memory and global variables are shared between threads, but the access to these resources needs to be synchronized typically through mutex and condition variables.

还有 here

Using shared memory, we can avoid two data copies, but we have to synchronize the access to the shared memory segment.

Shared memory avoids this overhead, but we need to synchronize both processes