Starts asynchronous initialization of the object implementing the interface.
This must be done before any real use of the object after initial construction. If the object also implements Initable you can optionally call init instead.
When the initialization is finished, callback will be called. You can then call init_async.end
to get the result of the initialization.
Implementations may also support cancellation. If cancellable is not null, then
initialization can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error
g_io_error_cancelled will be returned. If cancellable is not
null, and the object doesn't support cancellable initialization, the error
g_io_error_not_supported will be returned.
As with Initable, if the object is not initialized, or initialization returns with an error, then all operations on the object except @ref and unref are considered to be invalid, and have undefined behaviour. They will often fail with critical or warning, but this must not be relied on.
Implementations of this method must be idempotent: i.e. multiple calls to this function with the same argument should return the same results. Only the first call initializes the object; further calls return the result of the first call. This is so that it's safe to implement the singleton pattern in the GObject constructor function.
For classes that also support the Initable interface, the default implementation of this method will run the init function in a thread, so if you want to support asynchronous initialization via threads, just implement the AsyncInitable interface without overriding any interface methods.
| this | |
| io_priority |
the I/O priority of the operation |
| cancellable |
optional Cancellable object, null to ignore. |
| callback |
a AsyncReadyCallback to call when the request is satisfied |
| user_data |
the data to pass to callback function |