Ada Programming/Libraries/Ada.Synchronous Task Control

is a unit of the Predefined Language Environment since Ada 95.

Specification
Preelaborate Synchronous_Task_Control Suspension_Object Set_True S   Suspension_Object Set_False S   Suspension_Object Current_State S  Suspension_Object  Boolean Suspend_Until_True S   Suspension_Object Import Ada Suspension_Object AdaSynchronous_Task_Control

Wikibook

 * Ada Programming/Libraries/Ada