MainContext.wakeup

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

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

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

[define|define] NUM_TASKS 10
static volatile gint tasks_remaining = NUM_TASKS;
...

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);