Man pages matching name gearman_client_task_free_all in section 3:

gearman_client_task_free_all.3.en	debian 10 / libgearman-dev
gearman_client_task_free_all.3.en	debian 11 / libgearman-dev
gearman_client_task_free_all.3.en	debian 12 / libgearman-dev