public int wait
Wait for activity on the file descriptors in
This function waits up to the specified
timeout. A timeout of
CLOCK_TIME_NONE waits forever.
For Poll objects created with
Poll, this function can only be called from a single thread at a time.
If called from multiple threads, -1 will be returned with errno set to EPERM.
This is not true for timer Poll objects created with
Poll.timer, where it is allowed to have multiple threads waiting
||a timeout in nanoseconds.
|The number of PollFD in
set that have activity or 0 when no
activity was detected after
timeout. If an error occurs, -1 is returned and errno is set.