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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?

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  • The functions you mention seem to indicate a Linux environment. Is that so? Or do you require more portable solution? Anyway, I suggest using more well established interprocess communication. Why not just use sockets. Commented Mar 30, 2016 at 4:19
  • possible duplicate stackoverflow.com/questions/32440527/… Commented Mar 30, 2016 at 4:27
  • @Cheersandhth.-Alf yes it's linux environment. Doesn't have to be portable. We want to use shared memory for performance reason (to avoid copying). Commented Mar 30, 2016 at 4:35
  • @BevynQ seems like the link you posted doesn't solve my issue. It's also windows based. Commented Mar 30, 2016 at 4:36

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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.

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