## GstTaskPool

GstTaskPool — Pool of GStreamer streaming threads

## Synopsis

    #include <gst/gst.h>

    struct              GstTaskPool;
    struct              GstTaskPoolClass;
    void                (*GstTaskPoolFunction)              (void *user_data);
    GstTaskPool *       gst_task_pool_new                   (void);
    void                gst_task_pool_prepare               (GstTaskPool *pool,
                                                             GError **error);
    gpointer            gst_task_pool_push                  (GstTaskPool *pool,
                                                             GstTaskPoolFunction func,
                                                             gpointer user_data,
                                                             GError **error);
    void                gst_task_pool_join                  (GstTaskPool *pool,
                                                             gpointer id);
    void                gst_task_pool_cleanup               (GstTaskPool *pool);

## Object Hierarchy

      GObject
       +----GInitiallyUnowned
             +----GstObject
                   +----GstTaskPool

## Description

This object provides an abstraction for creating threads. The default implementation uses a regular GThreadPool to start tasks.

Subclasses can be made to create custom threads.

Last reviewed on 2009-04-23 (0.10.24)

## Details

### struct GstTaskPool

    struct GstTaskPool;

The GstTaskPool object.

### struct GstTaskPoolClass

    struct GstTaskPoolClass {
      GstObjectClass parent_class;

      void      (*prepare)  (GstTaskPool *pool, GError **error);
      void      (*cleanup)  (GstTaskPool *pool);

      gpointer  (*push)     (GstTaskPool *pool, GstTaskPoolFunction func,
                             gpointer user_data, GError **error);
      void      (*join)     (GstTaskPool *pool, gpointer id);
    };

The GstTaskPoolClass object.

GstObjectClass `parent_class`; | the parent class structure
`prepare` () | prepare the threadpool
`cleanup` () | make sure all threads are stopped
`push` () | start a new thread
`join` () | join a thread

### GstTaskPoolFunction ()

    void                (*GstTaskPoolFunction)              (void *user_data);

Task function, see `gst_task_pool_push()`.

`user_data` : | user data for the task function

### gst_task_pool_new ()

    GstTaskPool *       gst_task_pool_new                   (void);

Create a new default task pool. The default task pool will use a regular GThreadPool for threads.

Returns : | a new GstTaskPool. `gst_object_unref()` after usage. [transfer full]

### gst_task_pool_prepare ()

    void                gst_task_pool_prepare               (GstTaskPool *pool,
                                                             GError **error);

Prepare the taskpool for accepting `gst_task_pool_push()` operations.

MT safe.

`pool` : | a GstTaskPool
`error` : | an error return location

### gst_task_pool_push ()

    gpointer            gst_task_pool_push                  (GstTaskPool *pool,
                                                             GstTaskPoolFunction func,
                                                             gpointer user_data,
                                                             GError **error);

Start the execution of a new thread from `pool`.

`pool` : | a GstTaskPool
`func` : | the function to call. [scope async]
`user_data` : | data to pass to `func`. [closure]
`error` : | return location for an error
Returns : | a pointer that should be used for the gst_task_pool_join function. This pointer can be NULL, you must check `error` to detect errors. [transfer none]

### gst_task_pool_join ()

    void                gst_task_pool_join                  (GstTaskPool *pool,
                                                             gpointer id);

Join a task and/or return it to the pool. `id` is the id obtained from `gst_task_pool_push()`.

`pool` : | a GstTaskPool
`id` : | the id

### gst_task_pool_cleanup ()

    void                gst_task_pool_cleanup               (GstTaskPool *pool);

Wait for all tasks to be stopped. This is mainly used internally to ensure proper cleanup of internal data structures in test suites.

MT safe.

`pool` : | a GstTaskPool

## See Also

GstTask, GstPad