HelenOS sources

EVENT_TASK_STATE_CHANGE  107 kernel/generic/src/ipc/ops/stchngath.c 			    EVENT_TASK_STATE_CHANGE, false,
EVENT_TASK_STATE_CHANGE  122 uspace/srv/vfs/vfs.c 	async_event_task_subscribe(EVENT_TASK_STATE_CHANGE, notification_handler,
HelenOS homepage, sources at GitHub