Android NDK: error: 'pthread_getaffinity_np' was not declared in this scope

[domen....@gmail.com]

Hi,

I'm compiling Qt/C++ project with android NDK standalone toolchain. I’ve created standalone toolchain with make-standalone-toolchain.sh --arch=arm --toolchain=arm-linux-androideabi-4.9 --platform=android-22 command. NDK version is android-ndk-r10e. Target project uses some functions from pthread library. At compile time, I get the following error:

error: 'pthread_getaffinity_np' was not declared in this scope
const int err = pthread_getaffinity_np(_pthreadId, sizeof(cpu_set_t), &cpuSetMask);
compilation terminated due to -Wfatal-errors.

I've checked the header of pthread included in ndk toolchain and I did not find the declaration of pthread_getaffinity_np function. Is pthread functionality for Android limited? How to use pthread with Android NDK properly?

 

[Justin Webb]

pthread's "*_np" functions denote 'non-portable'.  They are platform dependant.

http://man7.org/linux/man-pages/man3/pthread_setaffinity_np.3.html#CONFORMING_TO

You'll have to find an alternate method with functions exposed via the NDK, or remove the ability to set affinity.