Android NDK and pthread

http://stackoverflow.com/questions/30801752/android-ndk-and-pthread

http://mobilepearls.com/labs/native-android-api/#pthreads

POSIX threads (pthreads)

The android libc, bionic, provides built-in support for pthreads, so
no additional linking (-lpthreads) is necessary. It does not implement
full POSIX threads functionality and leaves out support for read/write
locks, pthread_cancel(), process-shared mutexes and condition variables
as well as other more advanced features. Read the bionic OVERVIEW.txt for more information.

TLS, thread-local storage, is limited to 59 pthread_key_t slots available to applications, lower than the posix minimum of 128.