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Marius Vlad authored
Adds a minimalistic API for managing the subscription object. The subscribe functionality will be brought in once we re-organize a bit weston-debug-stream and split it properly. It extends the logging context with a linked list of potential subscription and adds a linked list of subscriptions in the log scope. This patch represents the start of a logging framework for weston. It's being built around weston-debug, with the intent to superseded it, and make weston-debug a client of the framework. Further more the logging framework should replace current logging handler and allow other types of streams to be used. Currently present in libweston under weston-debug we have log scopes, debug streams and a logging context. With this patch, two (internal) objects are being added: the concept of a subscriber and the concept of subscription. The subscription object is a ephemeral object, implicitly managed which is created each time one would want to a subscribe to a scope. The scope will maintain a list of subscriptions and will continue to be explicitly managed. The streams will use the subscriber object as a base class to extend upon. By doing so it allows to customize the stream with specific functions that manipulate the underlaying storage. The subscriber object will require a subscribe function and specific stream functions and like the scope, will be explicitly managed. Signed-off-by: Marius Vlad <marius.vlad@collabora.com> Suggested-by: Pekka Paalanen <pekka.paalanen@collabora.com>
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