hook_themes_disabled in core/modules/system/theme.api.php

Respond to themes being disabled.

UpdateCoreTestCase::testFetchTasks in core/modules/update/tests/update.test

Tests that exactly one fetch task per project is created and not more.

update_cache_clear_submit in core/modules/update/update.module

Form submission handler for system_modules().

update_flush_caches in core/modules/update/update.module

Implements hook_flush_caches().

update_project_cache in core/modules/update/update.compare.inc

Retrieves data from {cache_update} or empties the cache when necessary.

update_settings_submit in core/modules/update/update.admin.inc

Form submission handler for update_settings().

update_themes_disabled in core/modules/update/update.module

Implements hook_themes_disabled().

update_themes_enabled in core/modules/update/update.module

Implements hook_themes_enabled().

_update_process_fetch_task in core/modules/update/update.fetch.inc

Processes a task to fetch available update data for a single project.

_update_refresh in core/modules/update/update.fetch.inc

Clears out all the cached available update data and initiates re-fetching.