2005-03-17  Jose Ruiz  <ruiz@adacore.com>

	* s-taprob.adb (Initialize_Protection): Initialize the protected
	object's owner to Null_Task.
	(Lock): If pragma Detect_Blocking is in effect and the caller of this
	procedure is already the protected object's owner then Program_Error
	is raised. In addition the protected object's owner is updated.
	(Lock_Read_Only): If pragma Detect_Blocking is in effect and the caller
	of this procedure is already the protected object's owner then
	Program_Error is raised.
	In addition the protected object's owner is updated.
	(Unlock): Remove the ownership of the protected object.

	* s-taprob.ads (Protection): Add the field Owner, used to store the
	protected object's owner.
	This component is needed for detecting one type of potentially blocking
	operations (external calls on a protected subprogram with the same
	target object as that of the protected action). Document the rest of
	the components.

	* s-tposen.adb, s-tpoben.adb (Initialize_Protection_Entries):
	Initialize the protected object's owner to Null_Task.
	(Lock_Read_Only_Entries): If pragma Detect_Blocking is in effect and the
	caller of this procedure is already the protected object's owner then
	Program_Error is raised.
	Do not raise Program_Error when this procedure is called from a
	protected action.
	(Unlock_Entries): Remove the ownership of the protected object.
	(Lock_Entries): If pragma Detect_Blocking is in effect and the caller
	of this procedure is already the protected object's owner then
	Program_Error is raised.
	Do not raise Program_Error when this procedure is called from
	a protected action.

	* s-tposen.ads, s-tpoben.ads (Protection_Entries): Add the field Owner,
	used to store the protected object's owner.

	* s-tpobop.adb (Protected_Entry_Call): If pragma Detect_Blocking is in
	effect and this procedure (a potentially blocking operation) is called
	from whithin a protected action, Program_Error is raised.
	(Timed_Protected_Entry_Call): If pragma Detect_Blocking is in effect
	and this procedure (a potentially blocking operation) is called from
	whithin a protected action, Program_Error is raised.

From-SVN: r96675