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javac++shared-memorymmap
Chao Sun
Chao Sun

Reputation: 685

Shared memory between Java and C++

I'm trying to create some memory in C++ and access it in Java. On the C++ side I know that I can use shm_open and mmap to obtain a memory region and write some data into it. But, how can I open the memory-mapped file on the Java side? Someone suggested to use MappedByteBuffer but how can that access the "path" provided to shm_open (it only exists in memory so cannot initialize a File from it). Can I do this without using JNI?

Upvotes: 4

Views: 1933

Answers (1)

Tomasz
Tomasz

Reputation: 171

On Linux environment shared memory has special memory segment:

/dev/shm

Name provided in shm_open (e.g. "elo320") is used to create file

/dev/shm/elo320

This path can be used in Java.

Upvotes: 2

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