Poll
Object Hierarchy:
Description:
[ Compact ]
public class Poll
A Poll keeps track of file descriptors much like fd_set (used with select) or a struct pollfd array (used
with poll).
Once created with Poll, the set can be used to wait for file
descriptors to be readable and/or writeable. It is possible to make this wait be controlled by specifying true for the
controllable flag when creating the set (or later calling
set_controllable).
New file descriptors are added to the set using add_fd, and removed using
remove_fd. Controlling which file descriptors should be waited for to
become readable and/or writeable are done using ctl_read and
ctl_write.
Use wait to wait for the file descriptors to actually become readable and/or
writeable, or to timeout if no file descriptor is available in time. The wait can be controlled by calling
restart and
set_flushing.
Once the file descriptor set has been waited for, one can use
has_closed to see if the file descriptor has been closed,
has_error to see if it has generated an error, can_read to
see if it is possible to read from the file descriptor, and can_write
to see if it is possible to write to it.
Content:
Creation methods:
Methods:
- public bool add_fd (PollFD fd)
Add a file descriptor to the file descriptor set.
- public void get_read_gpollfd (PollFD fd)
Get a GPollFD for the reading part of the control socket.
- public bool read_control ()
Read a byte from the control socket of the controllable set.
- public bool remove_fd (PollFD fd)
Remove a file descriptor from the file descriptor set.
- public void restart ()
Restart any wait
that is in progress.
- public bool set_controllable (bool controllable)
When controllable is true, this function ensures
that future calls to wait will be affected by
restart and
set_flushing.
- public void set_flushing (bool flushing)
When flushing is true, this function ensures that
current and future calls to wait will return -1, with errno set to EBUSY.
- public int wait (ClockTime timeout)
Wait for activity on the file descriptors in set.
- public bool write_control ()
Write a byte to the control socket of the controllable set.
