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Diffstat (limited to 'gcc-4.4.0/gcc/ada/s-interr-vms.adb')
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diff --git a/gcc-4.4.0/gcc/ada/s-interr-vms.adb b/gcc-4.4.0/gcc/ada/s-interr-vms.adb deleted file mode 100644 index c43b04368..000000000 --- a/gcc-4.4.0/gcc/ada/s-interr-vms.adb +++ /dev/null @@ -1,1128 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- --- -- --- S Y S T E M . I N T E R R U P T S -- --- -- --- B o d y -- --- -- --- Copyright (C) 1992-2009, Free Software Foundation, Inc. -- --- -- --- GNARL is free software; you can redistribute it and/or modify it under -- --- terms of the GNU General Public License as published by the Free Soft- -- --- ware Foundation; either version 3, or (at your option) any later ver- -- --- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- --- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- --- or FITNESS FOR A PARTICULAR PURPOSE. -- --- -- --- As a special exception under Section 7 of GPL version 3, you are granted -- --- additional permissions described in the GCC Runtime Library Exception, -- --- version 3.1, as published by the Free Software Foundation. -- --- -- --- You should have received a copy of the GNU General Public License and -- --- a copy of the GCC Runtime Library Exception along with this program; -- --- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- --- <http://www.gnu.org/licenses/>. -- --- -- --- GNARL was developed by the GNARL team at Florida State University. -- --- Extensive contributions were provided by Ada Core Technologies, Inc. -- --- -- ------------------------------------------------------------------------------- - --- This is an OpenVMS/Alpha version of this package - --- Invariants: - --- Once we associate a Server_Task with an interrupt, the task never --- goes away, and we never remove the association. - --- There is no more than one interrupt per Server_Task and no more than --- one Server_Task per interrupt. - --- Within this package, the lock L is used to protect the various status --- tables. If there is a Server_Task associated with an interrupt, we use --- the per-task lock of the Server_Task instead so that we protect the --- status between Interrupt_Manager and Server_Task. Protection among --- service requests are done using User Request to Interrupt_Manager --- rendezvous. - -with Ada.Task_Identification; -with Ada.Unchecked_Conversion; - -with System.Task_Primitives; -with System.Interrupt_Management; - -with System.Interrupt_Management.Operations; -pragma Elaborate_All (System.Interrupt_Management.Operations); - -with System.Task_Primitives.Operations; -with System.Task_Primitives.Interrupt_Operations; -with System.Storage_Elements; -with System.Tasking.Utilities; - -with System.Tasking.Rendezvous; -pragma Elaborate_All (System.Tasking.Rendezvous); - -with System.Tasking.Initialization; -with System.Parameters; - -package body System.Interrupts is - - use Tasking; - use System.Parameters; - - package POP renames System.Task_Primitives.Operations; - package PIO renames System.Task_Primitives.Interrupt_Operations; - package IMNG renames System.Interrupt_Management; - package IMOP renames System.Interrupt_Management.Operations; - - function To_System is new Ada.Unchecked_Conversion - (Ada.Task_Identification.Task_Id, Task_Id); - - ----------------- - -- Local Tasks -- - ----------------- - - -- WARNING: System.Tasking.Stages performs calls to this task with - -- low-level constructs. Do not change this spec without synchronizing it. - - task Interrupt_Manager is - entry Detach_Interrupt_Entries (T : Task_Id); - - entry Initialize (Mask : IMNG.Interrupt_Mask); - - entry Attach_Handler - (New_Handler : Parameterless_Handler; - Interrupt : Interrupt_ID; - Static : Boolean; - Restoration : Boolean := False); - - entry Exchange_Handler - (Old_Handler : out Parameterless_Handler; - New_Handler : Parameterless_Handler; - Interrupt : Interrupt_ID; - Static : Boolean); - - entry Detach_Handler - (Interrupt : Interrupt_ID; - Static : Boolean); - - entry Bind_Interrupt_To_Entry - (T : Task_Id; - E : Task_Entry_Index; - Interrupt : Interrupt_ID); - - entry Block_Interrupt (Interrupt : Interrupt_ID); - - entry Unblock_Interrupt (Interrupt : Interrupt_ID); - - entry Ignore_Interrupt (Interrupt : Interrupt_ID); - - entry Unignore_Interrupt (Interrupt : Interrupt_ID); - - pragma Interrupt_Priority (System.Interrupt_Priority'Last); - end Interrupt_Manager; - - task type Server_Task (Interrupt : Interrupt_ID) is - pragma Priority (System.Interrupt_Priority'Last); - -- Note: the above pragma Priority is strictly speaking improper since - -- it is outside the range of allowed priorities, but the compiler - -- treats system units specially and does not apply this range checking - -- rule to system units. - - end Server_Task; - - type Server_Task_Access is access Server_Task; - - ------------------------------- - -- Local Types and Variables -- - ------------------------------- - - type Entry_Assoc is record - T : Task_Id; - E : Task_Entry_Index; - end record; - - type Handler_Assoc is record - H : Parameterless_Handler; - Static : Boolean; -- Indicates static binding; - end record; - - User_Handler : array (Interrupt_ID'Range) of Handler_Assoc := - (others => (null, Static => False)); - pragma Volatile_Components (User_Handler); - -- Holds the protected procedure handler (if any) and its Static - -- information for each interrupt. A handler is a Static one if it is - -- specified through the pragma Attach_Handler. Attach_Handler. Otherwise, - -- not static) - - User_Entry : array (Interrupt_ID'Range) of Entry_Assoc := - (others => (T => Null_Task, E => Null_Task_Entry)); - pragma Volatile_Components (User_Entry); - -- Holds the task and entry index (if any) for each interrupt - - Blocked : constant array (Interrupt_ID'Range) of Boolean := - (others => False); - -- ??? pragma Volatile_Components (Blocked); - -- True iff the corresponding interrupt is blocked in the process level - - Ignored : array (Interrupt_ID'Range) of Boolean := (others => False); - pragma Volatile_Components (Ignored); - -- True iff the corresponding interrupt is blocked in the process level - - Last_Unblocker : constant array (Interrupt_ID'Range) of Task_Id := - (others => Null_Task); --- ??? pragma Volatile_Components (Last_Unblocker); - -- Holds the ID of the last Task which Unblocked this Interrupt. - -- It contains Null_Task if no tasks have ever requested the - -- Unblocking operation or the Interrupt is currently Blocked. - - Server_ID : array (Interrupt_ID'Range) of Task_Id := - (others => Null_Task); - pragma Atomic_Components (Server_ID); - -- Holds the Task_Id of the Server_Task for each interrupt. Task_Id is - -- needed to accomplish locking per Interrupt base. Also is needed to - -- decide whether to create a new Server_Task. - - -- Type and Head, Tail of the list containing Registered Interrupt - -- Handlers. These definitions are used to register the handlers specified - -- by the pragma Interrupt_Handler. - - type Registered_Handler; - type R_Link is access all Registered_Handler; - - type Registered_Handler is record - H : System.Address := System.Null_Address; - Next : R_Link := null; - end record; - - Registered_Handler_Head : R_Link := null; - Registered_Handler_Tail : R_Link := null; - - Access_Hold : Server_Task_Access; - -- variable used to allocate Server_Task using "new" - - ----------------------- - -- Local Subprograms -- - ----------------------- - - function Is_Registered (Handler : Parameterless_Handler) return Boolean; - -- See if the Handler has been "pragma"ed using Interrupt_Handler. - -- Always consider a null handler as registered. - - -------------------------------- - -- Register_Interrupt_Handler -- - -------------------------------- - - procedure Register_Interrupt_Handler (Handler_Addr : System.Address) is - New_Node_Ptr : R_Link; - - begin - -- This routine registers the Handler as usable for Dynamic - -- Interrupt Handler. Routines attaching and detaching Handler - -- dynamically should first consult if the Handler is registered. - -- A Program Error should be raised if it is not registered. - - -- The pragma Interrupt_Handler can only appear in the library - -- level PO definition and instantiation. Therefore, we do not need - -- to implement Unregistering operation. Neither we need to - -- protect the queue structure using a Lock. - - pragma Assert (Handler_Addr /= System.Null_Address); - - New_Node_Ptr := new Registered_Handler; - New_Node_Ptr.H := Handler_Addr; - - if Registered_Handler_Head = null then - Registered_Handler_Head := New_Node_Ptr; - Registered_Handler_Tail := New_Node_Ptr; - - else - Registered_Handler_Tail.Next := New_Node_Ptr; - Registered_Handler_Tail := New_Node_Ptr; - end if; - end Register_Interrupt_Handler; - - ------------------- - -- Is_Registered -- - ------------------- - - function Is_Registered (Handler : Parameterless_Handler) return Boolean is - type Fat_Ptr is record - Object_Addr : System.Address; - Handler_Addr : System.Address; - end record; - - function To_Fat_Ptr is new Ada.Unchecked_Conversion - (Parameterless_Handler, Fat_Ptr); - - Ptr : R_Link; - Fat : Fat_Ptr; - - begin - if Handler = null then - return True; - end if; - - Fat := To_Fat_Ptr (Handler); - - Ptr := Registered_Handler_Head; - - while Ptr /= null loop - if Ptr.H = Fat.Handler_Addr then - return True; - end if; - - Ptr := Ptr.Next; - end loop; - - return False; - end Is_Registered; - - ----------------- - -- Is_Reserved -- - ----------------- - - function Is_Reserved (Interrupt : Interrupt_ID) return Boolean is - begin - return IMNG.Reserve (IMNG.Interrupt_ID (Interrupt)); - end Is_Reserved; - - ----------------------- - -- Is_Entry_Attached -- - ----------------------- - - function Is_Entry_Attached (Interrupt : Interrupt_ID) return Boolean is - begin - if Is_Reserved (Interrupt) then - raise Program_Error with - "Interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved"; - end if; - - return User_Entry (Interrupt).T /= Null_Task; - end Is_Entry_Attached; - - ------------------------- - -- Is_Handler_Attached -- - ------------------------- - - function Is_Handler_Attached (Interrupt : Interrupt_ID) return Boolean is - begin - if Is_Reserved (Interrupt) then - raise Program_Error with - "Interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved"; - end if; - - return User_Handler (Interrupt).H /= null; - end Is_Handler_Attached; - - ---------------- - -- Is_Blocked -- - ---------------- - - function Is_Blocked (Interrupt : Interrupt_ID) return Boolean is - begin - if Is_Reserved (Interrupt) then - raise Program_Error with - "Interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved"; - end if; - - return Blocked (Interrupt); - end Is_Blocked; - - ---------------- - -- Is_Ignored -- - ---------------- - - function Is_Ignored (Interrupt : Interrupt_ID) return Boolean is - begin - if Is_Reserved (Interrupt) then - raise Program_Error with - "Interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved"; - end if; - - return Ignored (Interrupt); - end Is_Ignored; - - --------------------- - -- Current_Handler -- - --------------------- - - function Current_Handler - (Interrupt : Interrupt_ID) return Parameterless_Handler - is - begin - if Is_Reserved (Interrupt) then - raise Program_Error with - "Interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved"; - end if; - - -- ??? Since Parameterless_Handler is not Atomic, the current - -- implementation is wrong. We need a new service in Interrupt_Manager - -- to ensure atomicity. - - return User_Handler (Interrupt).H; - end Current_Handler; - - -------------------- - -- Attach_Handler -- - -------------------- - - -- Calling this procedure with New_Handler = null and Static = True - -- means we want to detach the current handler regardless of the - -- previous handler's binding status (i.e. do not care if it is a - -- dynamic or static handler). - - -- This option is needed so that during the finalization of a PO, we - -- can detach handlers attached through pragma Attach_Handler. - - procedure Attach_Handler - (New_Handler : Parameterless_Handler; - Interrupt : Interrupt_ID; - Static : Boolean := False) is - begin - if Is_Reserved (Interrupt) then - raise Program_Error with - "Interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved"; - end if; - - Interrupt_Manager.Attach_Handler (New_Handler, Interrupt, Static); - - end Attach_Handler; - - ---------------------- - -- Exchange_Handler -- - ---------------------- - - -- Calling this procedure with New_Handler = null and Static = True means - -- we want to detach the current handler regardless of the previous - -- handler's binding status (i.e. do not care if it is dynamic or static - -- handler). - - -- This option is needed so that during the finalization of a PO, we can - -- detach handlers attached through pragma Attach_Handler. - - procedure Exchange_Handler - (Old_Handler : out Parameterless_Handler; - New_Handler : Parameterless_Handler; - Interrupt : Interrupt_ID; - Static : Boolean := False) - is - begin - if Is_Reserved (Interrupt) then - raise Program_Error with - "Interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved"; - end if; - - Interrupt_Manager.Exchange_Handler - (Old_Handler, New_Handler, Interrupt, Static); - - end Exchange_Handler; - - -------------------- - -- Detach_Handler -- - -------------------- - - -- Calling this procedure with Static = True means we want to Detach the - -- current handler regardless of the previous handler's binding status - -- (i.e. do not care if it is a dynamic or static handler). - - -- This option is needed so that during the finalization of a PO, we can - -- detach handlers attached through pragma Attach_Handler. - - procedure Detach_Handler - (Interrupt : Interrupt_ID; - Static : Boolean := False) - is - begin - if Is_Reserved (Interrupt) then - raise Program_Error with - "Interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved"; - end if; - - Interrupt_Manager.Detach_Handler (Interrupt, Static); - end Detach_Handler; - - --------------- - -- Reference -- - --------------- - - function Reference (Interrupt : Interrupt_ID) return System.Address is - begin - if Is_Reserved (Interrupt) then - raise Program_Error with - "Interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved"; - end if; - - return Storage_Elements.To_Address - (Storage_Elements.Integer_Address (Interrupt)); - end Reference; - - ----------------------------- - -- Bind_Interrupt_To_Entry -- - ----------------------------- - - -- This procedure raises a Program_Error if it tries to - -- bind an interrupt to which an Entry or a Procedure is - -- already bound. - - procedure Bind_Interrupt_To_Entry - (T : Task_Id; - E : Task_Entry_Index; - Int_Ref : System.Address) - is - Interrupt : constant Interrupt_ID := - Interrupt_ID (Storage_Elements.To_Integer (Int_Ref)); - - begin - if Is_Reserved (Interrupt) then - raise Program_Error with - "Interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved"; - end if; - - Interrupt_Manager.Bind_Interrupt_To_Entry (T, E, Interrupt); - - end Bind_Interrupt_To_Entry; - - ------------------------------ - -- Detach_Interrupt_Entries -- - ------------------------------ - - procedure Detach_Interrupt_Entries (T : Task_Id) is - begin - Interrupt_Manager.Detach_Interrupt_Entries (T); - end Detach_Interrupt_Entries; - - --------------------- - -- Block_Interrupt -- - --------------------- - - procedure Block_Interrupt (Interrupt : Interrupt_ID) is - begin - if Is_Reserved (Interrupt) then - raise Program_Error with - "Interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved"; - end if; - - Interrupt_Manager.Block_Interrupt (Interrupt); - end Block_Interrupt; - - ----------------------- - -- Unblock_Interrupt -- - ----------------------- - - procedure Unblock_Interrupt (Interrupt : Interrupt_ID) is - begin - if Is_Reserved (Interrupt) then - raise Program_Error with - "Interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved"; - end if; - - Interrupt_Manager.Unblock_Interrupt (Interrupt); - end Unblock_Interrupt; - - ------------------ - -- Unblocked_By -- - ------------------ - - function Unblocked_By - (Interrupt : Interrupt_ID) return System.Tasking.Task_Id is - begin - if Is_Reserved (Interrupt) then - raise Program_Error with - "Interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved"; - end if; - - return Last_Unblocker (Interrupt); - end Unblocked_By; - - ---------------------- - -- Ignore_Interrupt -- - ---------------------- - - procedure Ignore_Interrupt (Interrupt : Interrupt_ID) is - begin - if Is_Reserved (Interrupt) then - raise Program_Error with - "Interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved"; - end if; - - Interrupt_Manager.Ignore_Interrupt (Interrupt); - end Ignore_Interrupt; - - ------------------------ - -- Unignore_Interrupt -- - ------------------------ - - procedure Unignore_Interrupt (Interrupt : Interrupt_ID) is - begin - if Is_Reserved (Interrupt) then - raise Program_Error with - "Interrupt" & Interrupt_ID'Image (Interrupt) & " is reserved"; - end if; - - Interrupt_Manager.Unignore_Interrupt (Interrupt); - end Unignore_Interrupt; - - ----------------------- - -- Interrupt_Manager -- - ----------------------- - - task body Interrupt_Manager is - - -------------------- - -- Local Routines -- - -------------------- - - procedure Unprotected_Exchange_Handler - (Old_Handler : out Parameterless_Handler; - New_Handler : Parameterless_Handler; - Interrupt : Interrupt_ID; - Static : Boolean; - Restoration : Boolean := False); - - procedure Unprotected_Detach_Handler - (Interrupt : Interrupt_ID; - Static : Boolean); - - ---------------------------------- - -- Unprotected_Exchange_Handler -- - ---------------------------------- - - procedure Unprotected_Exchange_Handler - (Old_Handler : out Parameterless_Handler; - New_Handler : Parameterless_Handler; - Interrupt : Interrupt_ID; - Static : Boolean; - Restoration : Boolean := False) - is - begin - if User_Entry (Interrupt).T /= Null_Task then - - -- In case we have an Interrupt Entry already installed. - -- raise a program error. (propagate it to the caller). - - raise Program_Error with "An interrupt is already installed"; - end if; - - -- Note: A null handler with Static=True will pass the following - -- check. That is the case when we want to Detach a handler - -- regardless of the Static status of the current_Handler. We don't - -- check anything if Restoration is True, since we may be detaching - -- a static handler to restore a dynamic one. - - if not Restoration and then not Static - - -- Tries to overwrite a static Interrupt Handler with a - -- dynamic Handler - - and then (User_Handler (Interrupt).Static - - -- The new handler is not specified as an - -- Interrupt Handler by a pragma. - - or else not Is_Registered (New_Handler)) - then - raise Program_Error with - "Trying to overwrite a static Interrupt Handler with a " & - "dynamic Handler"; - end if; - - -- The interrupt should no longer be ignored if it was ever ignored - - Ignored (Interrupt) := False; - - -- Save the old handler - - Old_Handler := User_Handler (Interrupt).H; - - -- The new handler - - User_Handler (Interrupt).H := New_Handler; - - if New_Handler = null then - - -- The null handler means we are detaching the handler - - User_Handler (Interrupt).Static := False; - - else - User_Handler (Interrupt).Static := Static; - end if; - - -- Invoke a corresponding Server_Task if not yet created. - -- Place Task_Id info in Server_ID array. - - if Server_ID (Interrupt) = Null_Task then - Access_Hold := new Server_Task (Interrupt); - Server_ID (Interrupt) := To_System (Access_Hold.all'Identity); - else - POP.Wakeup (Server_ID (Interrupt), Interrupt_Server_Idle_Sleep); - end if; - - end Unprotected_Exchange_Handler; - - -------------------------------- - -- Unprotected_Detach_Handler -- - -------------------------------- - - procedure Unprotected_Detach_Handler - (Interrupt : Interrupt_ID; - Static : Boolean) - is - begin - if User_Entry (Interrupt).T /= Null_Task then - - -- In case we have an Interrupt Entry installed. - -- raise a program error. (propagate it to the caller). - - raise Program_Error with - "An interrupt entry is already installed"; - end if; - - -- Note : Static = True will pass the following check. That is the - -- case when we want to detach a handler regardless of the static - -- status of the current_Handler. - - if not Static and then User_Handler (Interrupt).Static then - -- Tries to detach a static Interrupt Handler. - -- raise a program error. - - raise Program_Error with - "Trying to detach a static Interrupt Handler"; - end if; - - -- The interrupt should no longer be ignored if - -- it was ever ignored. - - Ignored (Interrupt) := False; - - -- The new handler - - User_Handler (Interrupt).H := null; - User_Handler (Interrupt).Static := False; - IMOP.Interrupt_Self_Process (IMNG.Interrupt_ID (Interrupt)); - - end Unprotected_Detach_Handler; - - -- Start of processing for Interrupt_Manager - - begin - -- By making this task independent of master, when the process - -- goes away, the Interrupt_Manager will terminate gracefully. - - System.Tasking.Utilities.Make_Independent; - - -- Environment task gets its own interrupt mask, saves it, - -- and then masks all interrupts except the Keep_Unmasked set. - - -- During rendezvous, the Interrupt_Manager receives the old - -- interrupt mask of the environment task, and sets its own - -- interrupt mask to that value. - - -- The environment task will call the entry of Interrupt_Manager some - -- during elaboration of the body of this package. - - accept Initialize (Mask : IMNG.Interrupt_Mask) do - pragma Warnings (Off, Mask); - null; - end Initialize; - - -- Note: All tasks in RTS will have all the Reserve Interrupts - -- being masked (except the Interrupt_Manager) and Keep_Unmasked - -- unmasked when created. - - -- Abort_Task_Interrupt is one of the Interrupt unmasked - -- in all tasks. We mask the Interrupt in this particular task - -- so that "sigwait" is possible to catch an explicitly sent - -- Abort_Task_Interrupt from the Server_Tasks. - - -- This sigwaiting is needed so that we make sure a Server_Task is - -- out of its own sigwait state. This extra synchronization is - -- necessary to prevent following scenarios. - - -- 1) Interrupt_Manager sends an Abort_Task_Interrupt to the - -- Server_Task then changes its own interrupt mask (OS level). - -- If an interrupt (corresponding to the Server_Task) arrives - -- in the mean time we have the Interrupt_Manager unmasked and - -- the Server_Task waiting on sigwait. - - -- 2) For unbinding handler, we install a default action in the - -- Interrupt_Manager. POSIX.1c states that the result of using - -- "sigwait" and "sigaction" simultaneously on the same interrupt - -- is undefined. Therefore, we need to be informed from the - -- Server_Task of the fact that the Server_Task is out of its - -- sigwait stage. - - loop - -- A block is needed to absorb Program_Error exception - - declare - Old_Handler : Parameterless_Handler; - begin - select - - accept Attach_Handler - (New_Handler : Parameterless_Handler; - Interrupt : Interrupt_ID; - Static : Boolean; - Restoration : Boolean := False) - do - Unprotected_Exchange_Handler - (Old_Handler, New_Handler, Interrupt, Static, Restoration); - end Attach_Handler; - - or accept Exchange_Handler - (Old_Handler : out Parameterless_Handler; - New_Handler : Parameterless_Handler; - Interrupt : Interrupt_ID; - Static : Boolean) - do - Unprotected_Exchange_Handler - (Old_Handler, New_Handler, Interrupt, Static); - end Exchange_Handler; - - or accept Detach_Handler - (Interrupt : Interrupt_ID; - Static : Boolean) - do - Unprotected_Detach_Handler (Interrupt, Static); - end Detach_Handler; - - or accept Bind_Interrupt_To_Entry - (T : Task_Id; - E : Task_Entry_Index; - Interrupt : Interrupt_ID) - do - -- if there is a binding already (either a procedure or an - -- entry), raise Program_Error (propagate it to the caller). - - if User_Handler (Interrupt).H /= null - or else User_Entry (Interrupt).T /= Null_Task - then - raise Program_Error with - "A binding for this interrupt is already present"; - end if; - - -- The interrupt should no longer be ignored if - -- it was ever ignored. - - Ignored (Interrupt) := False; - User_Entry (Interrupt) := Entry_Assoc'(T => T, E => E); - - -- Indicate the attachment of Interrupt Entry in ATCB. - -- This is need so that when an Interrupt Entry task - -- terminates the binding can be cleaned. - -- The call to unbinding must be - -- make by the task before it terminates. - - T.Interrupt_Entry := True; - - -- Invoke a corresponding Server_Task if not yet created. - -- Place Task_Id info in Server_ID array. - - if Server_ID (Interrupt) = Null_Task then - - Access_Hold := new Server_Task (Interrupt); - Server_ID (Interrupt) := - To_System (Access_Hold.all'Identity); - else - POP.Wakeup (Server_ID (Interrupt), - Interrupt_Server_Idle_Sleep); - end if; - end Bind_Interrupt_To_Entry; - - or accept Detach_Interrupt_Entries (T : Task_Id) - do - for J in Interrupt_ID'Range loop - if not Is_Reserved (J) then - if User_Entry (J).T = T then - - -- The interrupt should no longer be ignored if - -- it was ever ignored. - - Ignored (J) := False; - User_Entry (J) := - Entry_Assoc'(T => Null_Task, E => Null_Task_Entry); - IMOP.Interrupt_Self_Process (IMNG.Interrupt_ID (J)); - end if; - end if; - end loop; - - -- Indicate in ATCB that no Interrupt Entries are attached - - T.Interrupt_Entry := False; - end Detach_Interrupt_Entries; - - or accept Block_Interrupt (Interrupt : Interrupt_ID) do - pragma Warnings (Off, Interrupt); - raise Program_Error; - end Block_Interrupt; - - or accept Unblock_Interrupt (Interrupt : Interrupt_ID) do - pragma Warnings (Off, Interrupt); - raise Program_Error; - end Unblock_Interrupt; - - or accept Ignore_Interrupt (Interrupt : Interrupt_ID) do - pragma Warnings (Off, Interrupt); - raise Program_Error; - end Ignore_Interrupt; - - or accept Unignore_Interrupt (Interrupt : Interrupt_ID) do - pragma Warnings (Off, Interrupt); - raise Program_Error; - end Unignore_Interrupt; - - end select; - - exception - -- If there is a program error we just want to propagate it - -- to the caller and do not want to stop this task. - - when Program_Error => - null; - - when others => - pragma Assert (False); - null; - end; - end loop; - end Interrupt_Manager; - - ----------------- - -- Server_Task -- - ----------------- - - task body Server_Task is - Self_ID : constant Task_Id := Self; - Tmp_Handler : Parameterless_Handler; - Tmp_ID : Task_Id; - Tmp_Entry_Index : Task_Entry_Index; - Intwait_Mask : aliased IMNG.Interrupt_Mask; - - begin - -- By making this task independent of master, when the process - -- goes away, the Server_Task will terminate gracefully. - - System.Tasking.Utilities.Make_Independent; - - -- Install default action in system level - - IMOP.Install_Default_Action (IMNG.Interrupt_ID (Interrupt)); - - -- Set up the mask (also clears the event flag) - - IMOP.Empty_Interrupt_Mask (Intwait_Mask'Access); - IMOP.Add_To_Interrupt_Mask - (Intwait_Mask'Access, IMNG.Interrupt_ID (Interrupt)); - - -- Remember the Interrupt_ID for Abort_Task - - PIO.Set_Interrupt_ID (IMNG.Interrupt_ID (Interrupt), Self_ID); - - -- Note: All tasks in RTS will have all the Reserve Interrupts - -- being masked (except the Interrupt_Manager) and Keep_Unmasked - -- unmasked when created. - - loop - System.Tasking.Initialization.Defer_Abort (Self_ID); - - -- A Handler or an Entry is installed. At this point all tasks - -- mask for the Interrupt is masked. Catch the Interrupt using - -- sigwait. - - -- This task may wake up from sigwait by receiving an interrupt - -- (Abort_Task_Interrupt) from the Interrupt_Manager for unbinding - -- a Procedure Handler or an Entry. Or it could be a wake up - -- from status change (Unblocked -> Blocked). If that is not - -- the case, we should execute the attached Procedure or Entry. - - if Single_Lock then - POP.Lock_RTS; - end if; - - POP.Write_Lock (Self_ID); - - if User_Handler (Interrupt).H = null - and then User_Entry (Interrupt).T = Null_Task - then - -- No Interrupt binding. If there is an interrupt, - -- Interrupt_Manager will take default action. - - Self_ID.Common.State := Interrupt_Server_Idle_Sleep; - POP.Sleep (Self_ID, Interrupt_Server_Idle_Sleep); - Self_ID.Common.State := Runnable; - - else - Self_ID.Common.State := Interrupt_Server_Blocked_On_Event_Flag; - Self_ID.Common.State := Runnable; - - if not (Self_ID.Deferral_Level = 0 - and then Self_ID.Pending_ATC_Level - < Self_ID.ATC_Nesting_Level) - then - if User_Handler (Interrupt).H /= null then - Tmp_Handler := User_Handler (Interrupt).H; - - -- RTS calls should not be made with self being locked - - POP.Unlock (Self_ID); - - if Single_Lock then - POP.Unlock_RTS; - end if; - - Tmp_Handler.all; - - if Single_Lock then - POP.Lock_RTS; - end if; - - POP.Write_Lock (Self_ID); - - elsif User_Entry (Interrupt).T /= Null_Task then - Tmp_ID := User_Entry (Interrupt).T; - Tmp_Entry_Index := User_Entry (Interrupt).E; - - -- RTS calls should not be made with self being locked - - POP.Unlock (Self_ID); - - if Single_Lock then - POP.Unlock_RTS; - end if; - - System.Tasking.Rendezvous.Call_Simple - (Tmp_ID, Tmp_Entry_Index, System.Null_Address); - - if Single_Lock then - POP.Lock_RTS; - end if; - - POP.Write_Lock (Self_ID); - end if; - end if; - end if; - - POP.Unlock (Self_ID); - - if Single_Lock then - POP.Unlock_RTS; - end if; - - System.Tasking.Initialization.Undefer_Abort (Self_ID); - - -- Undefer abort here to allow a window for this task - -- to be aborted at the time of system shutdown. - end loop; - end Server_Task; - - ------------------------------------- - -- Has_Interrupt_Or_Attach_Handler -- - ------------------------------------- - - function Has_Interrupt_Or_Attach_Handler - (Object : access Dynamic_Interrupt_Protection) return Boolean - is - pragma Warnings (Off, Object); - - begin - return True; - end Has_Interrupt_Or_Attach_Handler; - - -------------- - -- Finalize -- - -------------- - - procedure Finalize (Object : in out Static_Interrupt_Protection) is - begin - -- ??? loop to be executed only when we're not doing library level - -- finalization, since in this case all interrupt tasks are gone. - - if not Interrupt_Manager'Terminated then - for N in reverse Object.Previous_Handlers'Range loop - Interrupt_Manager.Attach_Handler - (New_Handler => Object.Previous_Handlers (N).Handler, - Interrupt => Object.Previous_Handlers (N).Interrupt, - Static => Object.Previous_Handlers (N).Static, - Restoration => True); - end loop; - end if; - - Tasking.Protected_Objects.Entries.Finalize - (Tasking.Protected_Objects.Entries.Protection_Entries (Object)); - end Finalize; - - ------------------------------------- - -- Has_Interrupt_Or_Attach_Handler -- - ------------------------------------- - - function Has_Interrupt_Or_Attach_Handler - (Object : access Static_Interrupt_Protection) return Boolean - is - pragma Warnings (Off, Object); - begin - return True; - end Has_Interrupt_Or_Attach_Handler; - - ---------------------- - -- Install_Handlers -- - ---------------------- - - procedure Install_Handlers - (Object : access Static_Interrupt_Protection; - New_Handlers : New_Handler_Array) - is - begin - for N in New_Handlers'Range loop - - -- We need a lock around this ??? - - Object.Previous_Handlers (N).Interrupt := New_Handlers (N).Interrupt; - Object.Previous_Handlers (N).Static := User_Handler - (New_Handlers (N).Interrupt).Static; - - -- We call Exchange_Handler and not directly Interrupt_Manager. - -- Exchange_Handler so we get the Is_Reserved check. - - Exchange_Handler - (Old_Handler => Object.Previous_Handlers (N).Handler, - New_Handler => New_Handlers (N).Handler, - Interrupt => New_Handlers (N).Interrupt, - Static => True); - end loop; - end Install_Handlers; - - --------------------------------- - -- Install_Restricted_Handlers -- - --------------------------------- - - procedure Install_Restricted_Handlers (Handlers : New_Handler_Array) is - begin - for N in Handlers'Range loop - Attach_Handler (Handlers (N).Handler, Handlers (N).Interrupt, True); - end loop; - end Install_Restricted_Handlers; - --- Elaboration code for package System.Interrupts - -begin - -- Get Interrupt_Manager's ID so that Abort_Interrupt can be sent - - Interrupt_Manager_ID := To_System (Interrupt_Manager'Identity); - - -- During the elaboration of this package body we want RTS to inherit the - -- interrupt mask from the Environment Task. - - -- The Environment Task should have gotten its mask from the enclosing - -- process during the RTS start up. (See in s-inmaop.adb). Pass the - -- Interrupt_Mask of the Environment task to the Interrupt_Manager. - - -- Note : At this point we know that all tasks (including RTS internal - -- servers) are masked for non-reserved signals (see s-taprop.adb). Only - -- the Interrupt_Manager will have masks set up differently inheriting the - -- original Environment Task's mask. - - Interrupt_Manager.Initialize (IMOP.Environment_Mask); -end System.Interrupts; |