Mark fd as ignored so that the next call to gst_poll_wait() will yield
the same result for fd as last time. This function must be called if no
operation (read/write/recv/send/etc.) will be performed on fd before
the next call to gst_poll_wait().
The reason why this is needed is because the underlying implementation might not allow querying the fd more than once between calls to one of the re-enabling operations.
Free a file descriptor set.
Read a byte from the control socket of the controllable set.
This function only works for timer #GstPoll objects created with gst_poll_new_timer().
Restart any gst_poll_wait() that is in progress. This function is typically
used after adding or removing descriptors to set.
If set is not controllable, then this call will have no effect.
This function only works for non-timer #GstPoll objects created with gst_poll_new().
When controllable is %TRUE, this function ensures that future calls to
gst_poll_wait() will be affected by gst_poll_restart() and
gst_poll_set_flushing().
This function only works for non-timer #GstPoll objects created with gst_poll_new().
new controllable state.
When flushing is %TRUE, this function ensures that current and future calls
to gst_poll_wait() will return -1, with errno set to EBUSY.
Unsetting the flushing state will restore normal operation of set.
This function only works for non-timer #GstPoll objects created with gst_poll_new().
new flushing state.
Wait for activity on the file descriptors in set. This function waits up to
the specified timeout. A timeout of #GST_CLOCK_TIME_NONE waits forever.
For #GstPoll objects created with gst_poll_new(), 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 #GstPoll objects created with gst_poll_new_timer(), where it is allowed to have multiple threads waiting simultaneously.
a timeout in nanoseconds.
Write a byte to the control socket of the controllable set.
This function is mostly useful for timer #GstPoll objects created with
gst_poll_new_timer().
It will make any current and future gst_poll_wait() function return with 1, meaning the control socket is set. After an equal amount of calls to gst_poll_read_control() have been performed, calls to gst_poll_wait() will block again until their timeout expired.
This function only works for timer #GstPoll objects created with gst_poll_new_timer().
A #GstPoll keeps track of file descriptors much like fd_set (used with select ()) or a struct pollfd array (used with poll ()). Once created with gst_poll_new(), the set can be used to wait for file descriptors to be readable and/or writable. It is possible to make this wait be controlled by specifying %TRUE for the
controllableflag when creating the set (or later calling gst_poll_set_controllable()).New file descriptors are added to the set using gst_poll_add_fd(), and removed using gst_poll_remove_fd(). Controlling which file descriptors should be waited for to become readable and/or writable are done using gst_poll_fd_ctl_read(), gst_poll_fd_ctl_write() and gst_poll_fd_ctl_pri().
Use gst_poll_wait() to wait for the file descriptors to actually become readable and/or writable, or to timeout if no file descriptor is available in time. The wait can be controlled by calling gst_poll_restart() and gst_poll_set_flushing().
Once the file descriptor set has been waited for, one can use gst_poll_fd_has_closed() to see if the file descriptor has been closed, gst_poll_fd_has_error() to see if it has generated an error, gst_poll_fd_can_read() to see if it is possible to read from the file descriptor, and gst_poll_fd_can_write() to see if it is possible to write to it.