Hello all,

Recently, I'm testing read/write performance of flash memory on my QNX device,
but I'm getting poor performance  with POSIX support method `aio_read()` and `aio_write()`,
after searching , I found out It might because it was using multi-thread to perform async I/O , causing heavily context 
switch/thread creation/thread deletion.

so, does there exist any other I/O method which supports asynchronous I/O besides `aio_read()` and `aio_write()`,
or there's better way to perform test of read/write.