3 calls to _update_cache_set()

update_calculate_project_data in modules/update/update.compare.inc
Calculates the current update status of all projects on the site.
update_get_projects in modules/update/update.compare.inc
Fetches an array of installed and enabled projects.
_update_process_fetch_task in modules/update/update.fetch.inc
Processes a task to fetch available update data for a single project.

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.