with Ada.Exceptions;
with System.Task_Primitives.Operations;
with System.Tasking.Initialization;
pragma Elaborate_All (System.Tasking.Initialization);
with System.Parameters;
package body System.Tasking.Protected_Objects.Entries is
package STPO renames System.Task_Primitives.Operations;
use Parameters;
use Task_Primitives.Operations;
use Ada.Exceptions;
Locking_Policy : Character;
pragma Import (C, Locking_Policy, "__gl_locking_policy");
procedure Finalize (Object : in out Protection_Entries) is
Entry_Call : Entry_Call_Link;
Caller : Task_ID;
Ceiling_Violation : Boolean;
Self_ID : constant Task_ID := STPO.Self;
Old_Base_Priority : System.Any_Priority;
begin
if Object.Finalized then
return;
end if;
STPO.Write_Lock (Object.L'Unrestricted_Access, Ceiling_Violation);
if Single_Lock then
Lock_RTS;
end if;
if Ceiling_Violation then
STPO.Write_Lock (Self_ID);
Old_Base_Priority := Self_ID.Common.Base_Priority;
Self_ID.New_Base_Priority := Object.Ceiling;
Initialization.Change_Base_Priority (Self_ID);
STPO.Unlock (Self_ID);
if Single_Lock then
Unlock_RTS;
end if;
STPO.Write_Lock (Object.L'Unrestricted_Access, Ceiling_Violation);
if Ceiling_Violation then
Raise_Exception (Program_Error'Identity, "Ceiling Violation");
end if;
if Single_Lock then
Lock_RTS;
end if;
Object.Old_Base_Priority := Old_Base_Priority;
Object.Pending_Action := True;
end if;
for E in Object.Entry_Queues'Range loop
Entry_Call := Object.Entry_Queues (E).Head;
while Entry_Call /= null loop
Caller := Entry_Call.Self;
Entry_Call.Exception_To_Raise := Program_Error'Identity;
STPO.Write_Lock (Caller);
Initialization.Wakeup_Entry_Caller (Self_ID, Entry_Call, Done);
STPO.Unlock (Caller);
exit when Entry_Call = Object.Entry_Queues (E).Tail;
Entry_Call := Entry_Call.Next;
end loop;
end loop;
Object.Finalized := True;
if Single_Lock then
Unlock_RTS;
end if;
STPO.Unlock (Object.L'Unrestricted_Access);
STPO.Finalize_Lock (Object.L'Unrestricted_Access);
end Finalize;
function Has_Interrupt_Or_Attach_Handler
(Object : Protection_Entries_Access)
return Boolean
is
pragma Warnings (Off, Object);
begin
return False;
end Has_Interrupt_Or_Attach_Handler;
procedure Initialize_Protection_Entries
(Object : Protection_Entries_Access;
Ceiling_Priority : Integer;
Compiler_Info : System.Address;
Entry_Bodies : Protected_Entry_Body_Access;
Find_Body_Index : Find_Body_Index_Access)
is
Init_Priority : Integer := Ceiling_Priority;
Self_ID : constant Task_ID := STPO.Self;
begin
if Init_Priority = Unspecified_Priority then
Init_Priority := System.Priority'Last;
end if;
if Locking_Policy = 'C'
and then Has_Interrupt_Or_Attach_Handler (Object)
and then Init_Priority not in System.Interrupt_Priority
then
raise Program_Error;
end if;
Initialization.Defer_Abort (Self_ID);
Initialize_Lock (Init_Priority, Object.L'Access);
Initialization.Undefer_Abort (Self_ID);
Object.Ceiling := System.Any_Priority (Init_Priority);
Object.Compiler_Info := Compiler_Info;
Object.Pending_Action := False;
Object.Call_In_Progress := null;
Object.Entry_Bodies := Entry_Bodies;
Object.Find_Body_Index := Find_Body_Index;
for E in Object.Entry_Queues'Range loop
Object.Entry_Queues (E).Head := null;
Object.Entry_Queues (E).Tail := null;
end loop;
end Initialize_Protection_Entries;
procedure Lock_Entries
(Object : Protection_Entries_Access; Ceiling_Violation : out Boolean) is
begin
if Object.Finalized then
Raise_Exception
(Program_Error'Identity, "Protected Object is finalized");
end if;
pragma Assert (STPO.Self.Deferral_Level > 0);
Write_Lock (Object.L'Access, Ceiling_Violation);
end Lock_Entries;
procedure Lock_Entries (Object : Protection_Entries_Access) is
Ceiling_Violation : Boolean;
begin
if Object.Finalized then
Raise_Exception
(Program_Error'Identity, "Protected Object is finalized");
end if;
pragma Assert (STPO.Self.Deferral_Level > 0);
Write_Lock (Object.L'Access, Ceiling_Violation);
if Ceiling_Violation then
Raise_Exception (Program_Error'Identity, "Ceiling Violation");
end if;
end Lock_Entries;
procedure Lock_Read_Only_Entries (Object : Protection_Entries_Access) is
Ceiling_Violation : Boolean;
begin
if Object.Finalized then
Raise_Exception
(Program_Error'Identity, "Protected Object is finalized");
end if;
Read_Lock (Object.L'Access, Ceiling_Violation);
if Ceiling_Violation then
Raise_Exception (Program_Error'Identity, "Ceiling Violation");
end if;
end Lock_Read_Only_Entries;
procedure Unlock_Entries (Object : Protection_Entries_Access) is
begin
Unlock (Object.L'Access);
end Unlock_Entries;
end System.Tasking.Protected_Objects.Entries;