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Cancellation

Cancellation — halt in-progress operations

Description

Details

gnome_vfs_cancellation_new ()

GnomeVFSCancellation * gnome_vfs_cancellation_new       (void);

Create a new GnomeVFSCancellation object for reporting cancellation to a gnome-vfs module.

Returns :

A pointer to the new GnomeVFSCancellation object.

gnome_vfs_cancellation_destroy ()

void                gnome_vfs_cancellation_destroy      (GnomeVFSCancellation *cancellation);

Destroy cancellation.

cancellation :

a GnomeVFSCancellation object.

gnome_vfs_cancellation_cancel ()

void                gnome_vfs_cancellation_cancel       (GnomeVFSCancellation *cancellation);

Send a cancellation request through cancellation.

If called on a different thread than the one handling idle callbacks, there is a small race condition where the operation finished callback will be called even if you cancelled the operation. Its the apps responsibility to handle this. See gnome_vfs_async_cancel() for more discussion about this.

cancellation :

a GnomeVFSCancellation object.

gnome_vfs_cancellation_check ()

gboolean            gnome_vfs_cancellation_check        (GnomeVFSCancellation *cancellation);

Check for pending cancellation.

cancellation :

a GnomeVFSCancellation object.

Returns :

TRUE if the operation should be interrupted.

gnome_vfs_cancellation_ack ()

void                gnome_vfs_cancellation_ack          (GnomeVFSCancellation *cancellation);

Acknowledge a cancellation. This should be called if gnome_vfs_cancellation_check() returns TRUE or if select() reports that input is available on the file descriptor returned by gnome_vfs_cancellation_get_fd().

cancellation :

a GnomeVFSCancellation object.

gnome_vfs_cancellation_get_fd ()

gint                gnome_vfs_cancellation_get_fd       (GnomeVFSCancellation *cancellation);

Get a file descriptor -based notificator for cancellation. When cancellation receives a cancellation request, a character will be made available on the returned file descriptor for input.

This is very useful for detecting cancellation during I/O operations: you can use the select() call to check for available input/output on the file you are reading/writing, and on the notificator's file descriptor at the same time. If a data is available on the notificator's file descriptor, you know you have to cancel the read/write operation.

cancellation :

a GnomeVFSCancellation object.

Returns :

the notificator's file descriptor, or -1 if starved of file descriptors.
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