GLibMainContextwakeup

If context is currently blocking in g_main_context_iteration() waiting for a source to become ready, cause it to stop blocking and return. Otherwise, cause the next invocation of g_main_context_iteration() to return without blocking.

This API is useful for low-level control over GMainContext; for example, integrating it with main loop implementations such as GMainLoop.

Another related use for this function is when implementing a main loop with a termination condition, computed from multiple threads:

  #define NUM_TASKS 10
  static gint tasks_remaining = NUM_TASKS;  // (atomic)
  ...
 
  while (g_atomic_int_get (&tasks_remaining) != 0)
    g_main_context_iteration (NULL, TRUE);

Then in a thread:

  perform_work();

  if (g_atomic_int_dec_and_test (&tasks_remaining))
    g_main_context_wakeup (NULL);