wait

Wait for activity on the file descriptors in this.

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 simultaneously.

Parameters:

this	a Poll.
timeout	a timeout in nanoseconds.

Returns:

The number of PollFD in this that have activity or 0 when no activity was detected after timeout. If an error occurs, -1 is returned and errno is set.