如何在android本机代码中使用共享内存？

Question

I am porting an existing linux application to android. The application is using shared memory API's like shm_open() etc.

Checking bionic in android source , I see that these API's are not supported. Hence I get a linking error during build.

external/l2/avbtp.c:138: error: undefined reference to 'shm_open'
external/l2/avbtp.c:151: error: undefined reference to 'shm_unlink'
external/l2/avbtp.c:186: error: undefined reference to 'shm_unlink'

How to resolve this correctly?

Answer 1

Android intentionally doesn't provide SysV IPC . Try to avoid using of shared memory or, if you really want, look for examples of using ashmem .

Answer 2

Well, I found this github project and well it works! https://github.com/pelya/android-shmem

Like a magic, it works perfectly. You can use shared memory in android across independent processes using shmget(), shmat() and shmdt() API's seamlessly. Give it a try.

Answer 3

yeh I have seen that project but I'm confused how to use it. I just want to deploy postgresql on my android phone properly but I'd doesnt work with ashmmem so I need to use this emulator the problem is I'm just a beginner and those explanation wasn't comprehensible enough . 😢