In Store.cpp, include unistd.h, which gives access to the sleep() function:

#include "Store.h"
#include <cstdlib>
#include <cstring>
#include <unistd.h>
...

Implement startWatcher(). This method is executed from the UI thread. To do so, first instantiate and initialize a StoreWatcher structure.

Then, initialize and launch a native thread with the pthread POSIX API:

StoreWatcher* startWatcher(JavaVM* pJavaVM, Store* pStore,
        jobject pLock) {
    StoreWatcher* watcher = new StoreWatcher();
    watcher->mJavaVM = pJavaVM;
    watcher->mStore = pStore;
    watcher->mLock = pLock;
    watcher->mRunning = true;
...

Then, initialize and launch a native thread with the PThread POSIX API: