Returns the unique index number of this thread in its pool.
The returned value ranges from zero to the maximum number of
threads (minus one) that may exist in the pool, and does not
change during the lifetime of the thread. This method may be
useful for applications that track status or collect results
per-worker-thread rather than per-task.
Returns the unique index number of this thread in its pool. The returned value ranges from zero to the maximum number of threads (minus one) that may exist in the pool, and does not change during the lifetime of the thread. This method may be useful for applications that track status or collect results per-worker-thread rather than per-task.
@return the index number