+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNU ADA 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 --
--- --
--- $Revision: 1.2.10.1 $
--- --
--- Copyright (C) 1991-2001 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 2, or (at your option) any later ver- --
--- sion. GNARL 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. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNARL; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- GNARL was developed by the GNARL team at Florida State University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- Invariants:
-
--- All user-handleable interrupts are masked at all times in all
--- tasks/threads except possibly for the Interrupt_Manager task.
-
--- When a user task wants to have the effect of masking/unmasking an
--- interrupt, it must call Block_Interrupt/Unblock_Interrupt, which
--- will have the effect of unmasking/masking the interrupt in the
--- Interrupt_Manager task.
-
--- Note : Direct calls to sigaction, sigprocmask, pthread_sigsetmask or any
--- other low-level interface that changes the interrupt action or
--- interrupt mask needs a careful thought.
--- One may acheive the effect of system calls first masking RTS blocked
--- (by calling Block_Interrupt) for the interrupt under consideration.
--- This will make all the tasks in RTS blocked for the Interrupt.
-
--- 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;
--- used for Task_ID type
-
-with Ada.Exceptions;
--- used for Raise_Exception
-
-with System.Task_Primitives;
--- used for RTS_Lock
--- Self
-
-with System.Interrupt_Management;
--- used for Reserve
--- Interrupt_ID
--- Interrupt_Mask
--- Abort_Task_Interrupt
-
-with System.Interrupt_Management.Operations;
--- used for Thread_Block_Interrupt
--- Thread_Unblock_Interrupt
--- Install_Default_Action
--- Install_Ignore_Action
--- Copy_Interrupt_Mask
--- Set_Interrupt_Mask
--- Empty_Interrupt_Mask
--- Fill_Interrupt_Mask
--- Add_To_Interrupt_Mask
--- Delete_From_Interrupt_Mask
--- Interrupt_Wait
--- Interrupt_Self_Process
--- Get_Interrupt_Mask
--- Set_Interrupt_Mask
--- IS_Member
--- Environment_Mask
--- All_Tasks_Mask
-pragma Elaborate_All (System.Interrupt_Management.Operations);
-
-with System.Error_Reporting;
--- used for Shutdown
-
-with System.Task_Primitives.Operations;
--- used for Write_Lock
--- Unlock
--- Abort
--- Wakeup_Task
--- Sleep
--- Initialize_Lock
-
-with System.Task_Primitives.Interrupt_Operations;
--- used for Set_Interrupt_ID
-
-with System.Storage_Elements;
--- used for To_Address
--- To_Integer
--- Integer_Address
-
-with System.Tasking;
--- used for Task_ID
--- Task_Entry_Index
--- Null_Task
--- Self
--- Interrupt_Manager_ID
-
-with System.Tasking.Utilities;
--- used for Make_Independent
-
-with System.Tasking.Rendezvous;
--- used for Call_Simple
-pragma Elaborate_All (System.Tasking.Rendezvous);
-
-with System.Tasking.Initialization;
--- used for Defer_Abort
--- Undefer_Abort
-
-with Unchecked_Conversion;
-
-package body System.Interrupts is
-
- use Tasking;
- use System.Error_Reporting;
- use Ada.Exceptions;
-
- package PRI renames System.Task_Primitives;
- 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 Unchecked_Conversion
- (Ada.Task_Identification.Task_Id, Task_ID);
-
- -----------------
- -- Local Tasks --
- -----------------
-
- -- WARNING: System.Tasking.Utilities performs calls to this task
- -- with low-level constructs. Do not change this spec without synchro-
- -- nizing it.
-
- task Interrupt_Manager is
- entry Initialize (Mask : IMNG.Interrupt_Mask);
-
- entry Attach_Handler
- (New_Handler : in Parameterless_Handler;
- Interrupt : in Interrupt_ID;
- Static : in Boolean;
- Restoration : in Boolean := False);
-
- entry Exchange_Handler
- (Old_Handler : out Parameterless_Handler;
- New_Handler : in Parameterless_Handler;
- Interrupt : in Interrupt_ID;
- Static : in Boolean);
-
- entry Detach_Handler
- (Interrupt : in Interrupt_ID;
- Static : in Boolean);
-
- entry Bind_Interrupt_To_Entry
- (T : Task_ID;
- E : Task_Entry_Index;
- Interrupt : Interrupt_ID);
-
- entry Detach_Interrupt_Entries (T : Task_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);
- 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 : 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 :
- 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".
-
- L : aliased PRI.RTS_Lock;
- -- L protects contents in tables above corresponding to interrupts
- -- for which Server_ID (T) = null.
- --
- -- If Server_ID (T) /= null then protection is via
- -- per-task (TCB) lock of Server_ID (T).
- --
- -- For deadlock prevention, L should not be locked after
- -- any other lock is held, hence we use PO_Level which is the highest
- -- lock level for error checking.
-
- Task_Lock : array (Interrupt_ID'Range) of Boolean := (others => False);
- -- Boolean flags to give matching Locking and Unlocking. See the comments
- -- in Lock_Interrupt.
-
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- procedure Lock_Interrupt
- (Self_ID : Task_ID;
- Interrupt : Interrupt_ID);
- -- protect the tables using L or per-task lock. Set the Boolean
- -- value Task_Lock if the lock is made using per-task lock.
- -- This information is needed so that Unlock_Interrupt
- -- performs unlocking on the same lock. The situation we are preventing
- -- is, for example, when Attach_Handler is called for the first time
- -- we lock L and create an Server_Task. For a matching unlocking, if we
- -- rely on the fact that there is a Server_Task, we will unlock the
- -- per-task lock.
-
- procedure Unlock_Interrupt
- (Self_ID : Task_ID;
- Interrupt : Interrupt_ID);
-
- function Is_Registered (Handler : Parameterless_Handler) return Boolean;
- -- ??? spec needs comments
-
- --------------------
- -- 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 (ie. 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 : in Parameterless_Handler;
- Interrupt : in Interrupt_ID;
- Static : in Boolean := False)
- is
- begin
- if Is_Reserved (Interrupt) then
- Raise_Exception (Program_Error'Identity, "Interrupt" &
- Interrupt_ID'Image (Interrupt) & " is reserved");
- end if;
-
- Interrupt_Manager.Attach_Handler (New_Handler, Interrupt, Static);
-
- end Attach_Handler;
-
- -----------------------------
- -- 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_Exception (Program_Error'Identity, "Interrupt" &
- Interrupt_ID'Image (Interrupt) & " is reserved");
- end if;
-
- Interrupt_Manager.Bind_Interrupt_To_Entry (T, E, Interrupt);
-
- end Bind_Interrupt_To_Entry;
-
- ---------------------
- -- Block_Interrupt --
- ---------------------
-
- procedure Block_Interrupt (Interrupt : Interrupt_ID) is
- begin
- if Is_Reserved (Interrupt) then
- Raise_Exception (Program_Error'Identity, "Interrupt" &
- Interrupt_ID'Image (Interrupt) & " is reserved");
- end if;
-
- Interrupt_Manager.Block_Interrupt (Interrupt);
- end Block_Interrupt;
-
- ---------------------
- -- Current_Handler --
- ---------------------
-
- function Current_Handler
- (Interrupt : Interrupt_ID)
- return Parameterless_Handler
- is
- begin
- if Is_Reserved (Interrupt) then
- Raise_Exception (Program_Error'Identity, "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;
-
- --------------------
- -- 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 : in Interrupt_ID;
- Static : in Boolean := False)
- is
- begin
- if Is_Reserved (Interrupt) then
- Raise_Exception (Program_Error'Identity, "Interrupt" &
- Interrupt_ID'Image (Interrupt) & " is reserved");
- end if;
-
- Interrupt_Manager.Detach_Handler (Interrupt, Static);
-
- end Detach_Handler;
-
- ------------------------------
- -- Detach_Interrupt_Entries --
- ------------------------------
-
- procedure Detach_Interrupt_Entries (T : Task_ID) is
- begin
- Interrupt_Manager.Detach_Interrupt_Entries (T);
- end Detach_Interrupt_Entries;
-
- ----------------------
- -- 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 (ie. 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 Exchange_Handler
- (Old_Handler : out Parameterless_Handler;
- New_Handler : in Parameterless_Handler;
- Interrupt : in Interrupt_ID;
- Static : in Boolean := False)
- is
- begin
- if Is_Reserved (Interrupt) then
- Raise_Exception (Program_Error'Identity, "Interrupt" &
- Interrupt_ID'Image (Interrupt) & " is reserved");
- end if;
-
- Interrupt_Manager.Exchange_Handler
- (Old_Handler, New_Handler, Interrupt, Static);
-
- end Exchange_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 Dynamic_Interrupt_Protection) return Boolean is
- begin
- return True;
- end Has_Interrupt_Or_Attach_Handler;
-
- function Has_Interrupt_Or_Attach_Handler
- (Object : access Static_Interrupt_Protection)
- return Boolean
- is
- begin
- return True;
- end Has_Interrupt_Or_Attach_Handler;
-
- ----------------------
- -- Ignore_Interrupt --
- ----------------------
-
- procedure Ignore_Interrupt (Interrupt : Interrupt_ID) is
- begin
- if Is_Reserved (Interrupt) then
- Raise_Exception (Program_Error'Identity, "Interrupt" &
- Interrupt_ID'Image (Interrupt) & " is reserved");
- end if;
-
- Interrupt_Manager.Ignore_Interrupt (Interrupt);
- end Ignore_Interrupt;
-
- ----------------------
- -- Install_Handlers --
- ----------------------
-
- procedure Install_Handlers
- (Object : access Static_Interrupt_Protection;
- New_Handlers : in 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;
-
- ----------------
- -- Is_Blocked --
- ----------------
-
- function Is_Blocked (Interrupt : Interrupt_ID) return Boolean is
- begin
- if Is_Reserved (Interrupt) then
- Raise_Exception (Program_Error'Identity, "Interrupt" &
- Interrupt_ID'Image (Interrupt) & " is reserved");
- end if;
-
- return Blocked (Interrupt);
- end Is_Blocked;
-
- -----------------------
- -- Is_Entry_Attached --
- -----------------------
-
- function Is_Entry_Attached (Interrupt : Interrupt_ID) return Boolean is
- begin
- if Is_Reserved (Interrupt) then
- Raise_Exception (Program_Error'Identity, "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_Exception (Program_Error'Identity, "Interrupt" &
- Interrupt_ID'Image (Interrupt) & " is reserved");
- end if;
-
- return User_Handler (Interrupt).H /= null;
- end Is_Handler_Attached;
-
- ----------------
- -- Is_Ignored --
- ----------------
-
- function Is_Ignored (Interrupt : Interrupt_ID) return Boolean is
- begin
- if Is_Reserved (Interrupt) then
- Raise_Exception (Program_Error'Identity, "Interrupt" &
- Interrupt_ID'Image (Interrupt) & " is reserved");
- end if;
-
- return Ignored (Interrupt);
- end Is_Ignored;
-
- -------------------
- -- Is_Registered --
- -------------------
-
- -- See if the Handler has been "pragma"ed using Interrupt_Handler.
- -- Always consider a null handler as 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 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;
-
- --------------------
- -- Lock_Interrupt --
- --------------------
-
- -- ?????
-
- -- This package has been modified several times.
- -- Do we still need this fancy locking scheme, now that more operations
- -- are entries of the interrupt manager task?
-
- -- ?????
-
- -- More likely, we will need to convert one or more entry calls to
- -- protected operations, because presently we are violating locking order
- -- rules by calling a task entry from within the runtime system.
-
- procedure Lock_Interrupt
- (Self_ID : Task_ID;
- Interrupt : Interrupt_ID)
- is
- begin
- Initialization.Defer_Abort (Self_ID);
-
- POP.Write_Lock (L'Access);
-
- if Task_Lock (Interrupt) then
-
- -- We need to use per-task lock.
-
- POP.Unlock (L'Access);
- POP.Write_Lock (Server_ID (Interrupt));
-
- -- Rely on the fact that once Server_ID is set to a non-null
- -- value it will never be set back to null.
-
- elsif Server_ID (Interrupt) /= Null_Task then
-
- -- We need to use per-task lock.
-
- Task_Lock (Interrupt) := True;
- POP.Unlock (L'Access);
- POP.Write_Lock (Server_ID (Interrupt));
- end if;
- end Lock_Interrupt;
-
- ---------------
- -- Reference --
- ---------------
-
- function Reference (Interrupt : Interrupt_ID) return System.Address is
- begin
- if Is_Reserved (Interrupt) then
- Raise_Exception (Program_Error'Identity, "Interrupt" &
- Interrupt_ID'Image (Interrupt) & " is reserved");
- end if;
-
- return Storage_Elements.To_Address
- (Storage_Elements.Integer_Address (Interrupt));
- end Reference;
-
- ---------------------------------
- -- 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 rgistered.
- -- 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;
-
- -----------------------
- -- Unblock_Interrupt --
- -----------------------
-
- procedure Unblock_Interrupt (Interrupt : Interrupt_ID) is
- begin
- if Is_Reserved (Interrupt) then
- Raise_Exception (Program_Error'Identity, "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_Exception (Program_Error'Identity, "Interrupt" &
- Interrupt_ID'Image (Interrupt) & " is reserved");
- end if;
-
- return Last_Unblocker (Interrupt);
- end Unblocked_By;
-
- ------------------------
- -- Unignore_Interrupt --
- ------------------------
-
- procedure Unignore_Interrupt (Interrupt : Interrupt_ID) is
- begin
- if Is_Reserved (Interrupt) then
- Raise_Exception (Program_Error'Identity, "Interrupt" &
- Interrupt_ID'Image (Interrupt) & " is reserved");
- end if;
-
- Interrupt_Manager.Unignore_Interrupt (Interrupt);
- end Unignore_Interrupt;
-
- ----------------------
- -- Unlock_Interrupt --
- ----------------------
-
- procedure Unlock_Interrupt
- (Self_ID : Task_ID;
- Interrupt : Interrupt_ID)
- is
- begin
- if Task_Lock (Interrupt) then
- POP.Unlock (Server_ID (Interrupt));
- else
- POP.Unlock (L'Access);
- end if;
-
- Initialization.Undefer_Abort (Self_ID);
- end Unlock_Interrupt;
-
- -----------------------
- -- Interrupt_Manager --
- -----------------------
-
- task body Interrupt_Manager is
-
- ----------------------
- -- Local Variables --
- ----------------------
-
- Intwait_Mask : aliased IMNG.Interrupt_Mask;
- Ret_Interrupt : Interrupt_ID;
- Old_Mask : aliased IMNG.Interrupt_Mask;
- Self_ID : Task_ID := POP.Self;
-
- ---------------------
- -- Local Routines --
- ---------------------
-
- procedure Bind_Handler (Interrupt : Interrupt_ID);
- -- This procedure does not do anything if the Interrupt is blocked.
- -- Otherwise, we have to interrupt Server_Task for status change through
- -- Wakeup interrupt.
-
- procedure Unbind_Handler (Interrupt : Interrupt_ID);
- -- This procedure does not do anything if the Interrupt is blocked.
- -- Otherwise, we have to interrupt Server_Task for status change
- -- through abort interrupt.
-
- -- Following two procedure are named Unprotected... in order to
- -- indicate that Lock/Unlock_Interrupt operations are needed around.
-
- procedure Unprotected_Exchange_Handler
- (Old_Handler : out Parameterless_Handler;
- New_Handler : in Parameterless_Handler;
- Interrupt : in Interrupt_ID;
- Static : in Boolean;
- Restoration : in Boolean := False);
-
- procedure Unprotected_Detach_Handler
- (Interrupt : in Interrupt_ID;
- Static : in Boolean);
-
- ------------------
- -- Bind_Handler --
- ------------------
-
- procedure Bind_Handler (Interrupt : Interrupt_ID) is
- begin
- if not Blocked (Interrupt) then
-
- -- Mask this task for the given Interrupt so that all tasks
- -- are masked for the Interrupt and the actuall delivery of the
- -- Interrupt will be caught using "sigwait" by the
- -- corresponding Server_Task.
-
- IMOP.Thread_Block_Interrupt (IMNG.Interrupt_ID (Interrupt));
-
- -- We have installed a Handler or an Entry before we called
- -- this procedure. If the Handler Task is waiting to be awakened,
- -- do it here. Otherwise, the interrupt will be discarded.
-
- POP.Wakeup (Server_ID (Interrupt), Interrupt_Server_Idle_Sleep);
- end if;
- end Bind_Handler;
-
- --------------------
- -- Unbind_Handler --
- --------------------
-
- procedure Unbind_Handler (Interrupt : Interrupt_ID) is
- begin
- if not Blocked (Interrupt) then
-
- -- Currently, there is a Handler or an Entry attached and
- -- corresponding Server_Task is waiting on "sigwait."
- -- We have to wake up the Server_Task and make it
- -- wait on condition variable by sending an
- -- Abort_Task_Interrupt
-
- POP.Abort_Task (Server_ID (Interrupt));
-
- -- Make sure corresponding Server_Task is out of its own
- -- sigwait state.
-
- Ret_Interrupt :=
- Interrupt_ID (IMOP.Interrupt_Wait (Intwait_Mask'Access));
-
- pragma Assert
- (Ret_Interrupt = Interrupt_ID (IMNG.Abort_Task_Interrupt));
-
- IMOP.Install_Default_Action (IMNG.Interrupt_ID (Interrupt));
-
- -- Unmake the Interrupt for this task in order to allow default
- -- action again.
-
- IMOP.Thread_Unblock_Interrupt (IMNG.Interrupt_ID (Interrupt));
-
- else
- IMOP.Install_Default_Action (IMNG.Interrupt_ID (Interrupt));
- end if;
-
- end Unbind_Handler;
-
- --------------------------------
- -- Unprotected_Detach_Handler --
- --------------------------------
-
- procedure Unprotected_Detach_Handler
- (Interrupt : in Interrupt_ID;
- Static : in Boolean)
- is
- Old_Handler : Parameterless_Handler;
-
- 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).
-
- Unlock_Interrupt (Self_ID, Interrupt);
- Raise_Exception (Program_Error'Identity,
- "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.
-
- Unlock_Interrupt (Self_ID, Interrupt);
- Raise_Exception (Program_Error'Identity,
- "Trying to detach a static Interrupt Handler");
- end if;
-
- -- The interrupt should no longer be ignored if
- -- it was ever ignored.
-
- Ignored (Interrupt) := False;
-
- Old_Handler := User_Handler (Interrupt).H;
-
- -- The new handler
-
- User_Handler (Interrupt).H := null;
- User_Handler (Interrupt).Static := False;
-
- if Old_Handler /= null then
- Unbind_Handler (Interrupt);
- end if;
-
- end Unprotected_Detach_Handler;
-
- ----------------------------------
- -- Unprotected_Exchange_Handler --
- ----------------------------------
-
- procedure Unprotected_Exchange_Handler
- (Old_Handler : out Parameterless_Handler;
- New_Handler : in Parameterless_Handler;
- Interrupt : in Interrupt_ID;
- Static : in Boolean;
- Restoration : in 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).
-
- Unlock_Interrupt (Self_ID, Interrupt);
- Raise_Exception (Program_Error'Identity,
- "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
- Unlock_Interrupt (Self_ID, Interrupt);
- Raise_Exception (Program_Error'Identity,
- "Trying to overwrite a static Interrupt Handler with a " &
- "dynamic Handler");
- end if;
-
- -- The interrupt should no longer be ingnored 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
-
- -- When a new Server_Task is created, it should have its
- -- signal mask set to the All_Tasks_Mask.
-
- IMOP.Set_Interrupt_Mask
- (IMOP.All_Tasks_Mask'Access, Old_Mask'Access);
- Access_Hold := new Server_Task (Interrupt);
- IMOP.Set_Interrupt_Mask (Old_Mask'Access);
-
- Server_ID (Interrupt) := To_System (Access_Hold.all'Identity);
- end if;
-
- if (New_Handler = null) then
- if Old_Handler /= null then
- Unbind_Handler (Interrupt);
- end if;
-
- return;
- end if;
-
- if Old_Handler = null then
- Bind_Handler (Interrupt);
- end if;
-
- end Unprotected_Exchange_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;
-
- -- Environmen 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
- declare
- The_Mask : aliased IMNG.Interrupt_Mask;
-
- begin
- IMOP.Copy_Interrupt_Mask (The_Mask, Mask);
- IMOP.Set_Interrupt_Mask (The_Mask'Access);
- end;
- 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 senarios.
-
- -- 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 nean time we have the Interrupt_Manager umnasked 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" simaltaneously 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.
-
- IMOP.Empty_Interrupt_Mask (Intwait_Mask'Access);
- IMOP.Add_To_Interrupt_Mask
- (Intwait_Mask'Access, IMNG.Abort_Task_Interrupt);
- IMOP.Thread_Block_Interrupt
- (IMNG.Abort_Task_Interrupt);
-
- loop
- -- A block is needed to absorb Program_Error exception
-
- declare
- Old_Handler : Parameterless_Handler;
-
- begin
- select
-
- accept Attach_Handler
- (New_Handler : in Parameterless_Handler;
- Interrupt : in Interrupt_ID;
- Static : in Boolean;
- Restoration : in Boolean := False)
- do
- Lock_Interrupt (Self_ID, Interrupt);
- Unprotected_Exchange_Handler
- (Old_Handler, New_Handler, Interrupt, Static, Restoration);
- Unlock_Interrupt (Self_ID, Interrupt);
- end Attach_Handler;
-
- or accept Exchange_Handler
- (Old_Handler : out Parameterless_Handler;
- New_Handler : in Parameterless_Handler;
- Interrupt : in Interrupt_ID;
- Static : in Boolean)
- do
- Lock_Interrupt (Self_ID, Interrupt);
- Unprotected_Exchange_Handler
- (Old_Handler, New_Handler, Interrupt, Static);
- Unlock_Interrupt (Self_ID, Interrupt);
- end Exchange_Handler;
-
- or accept Detach_Handler
- (Interrupt : in Interrupt_ID;
- Static : in Boolean)
- do
- Lock_Interrupt (Self_ID, Interrupt);
- Unprotected_Detach_Handler (Interrupt, Static);
- Unlock_Interrupt (Self_ID, Interrupt);
- end Detach_Handler;
-
- or accept Bind_Interrupt_To_Entry
- (T : Task_ID;
- E : Task_Entry_Index;
- Interrupt : Interrupt_ID)
- do
- Lock_Interrupt (Self_ID, Interrupt);
-
- -- 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
- Unlock_Interrupt (Self_ID, Interrupt);
- Raise_Exception (Program_Error'Identity,
- "A binding for this interrupt is already present");
- end if;
-
- -- The interrupt should no longer be ingnored 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
-
- -- When a new Server_Task is created, it should have its
- -- signal mask set to the All_Tasks_Mask.
-
- IMOP.Set_Interrupt_Mask
- (IMOP.All_Tasks_Mask'Access, Old_Mask'Access);
- Access_Hold := new Server_Task (Interrupt);
- IMOP.Set_Interrupt_Mask (Old_Mask'Access);
- Server_ID (Interrupt) :=
- To_System (Access_Hold.all'Identity);
- end if;
-
- Bind_Handler (Interrupt);
- Unlock_Interrupt (Self_ID, Interrupt);
- end Bind_Interrupt_To_Entry;
-
- or accept Detach_Interrupt_Entries (T : Task_ID)
- do
- for I in Interrupt_ID'Range loop
- if not Is_Reserved (I) then
- Lock_Interrupt (Self_ID, I);
-
- if User_Entry (I).T = T then
-
- -- The interrupt should no longer be ingnored if
- -- it was ever ignored.
-
- Ignored (I) := False;
- User_Entry (I) := Entry_Assoc'
- (T => Null_Task, E => Null_Task_Entry);
- Unbind_Handler (I);
- end if;
-
- Unlock_Interrupt (Self_ID, I);
- 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
- Lock_Interrupt (Self_ID, Interrupt);
-
- if Blocked (Interrupt) then
- Unlock_Interrupt (Self_ID, Interrupt);
- return;
- end if;
-
- Blocked (Interrupt) := True;
- Last_Unblocker (Interrupt) := Null_Task;
-
- -- Mask this task for the given Interrupt so that all tasks
- -- are masked for the Interrupt.
-
- IMOP.Thread_Block_Interrupt (IMNG.Interrupt_ID (Interrupt));
-
- if User_Handler (Interrupt).H /= null
- or else User_Entry (Interrupt).T /= Null_Task
- then
- -- This is the case where the Server_Task is waiting on
- -- "sigwait." Wake it up by sending an Abort_Task_Interrupt
- -- so that the Server_Task waits on Cond.
-
- POP.Abort_Task (Server_ID (Interrupt));
-
- -- Make sure corresponding Server_Task is out of its own
- -- sigwait state.
-
- Ret_Interrupt :=
- Interrupt_ID (IMOP.Interrupt_Wait (Intwait_Mask'Access));
- pragma Assert
- (Ret_Interrupt = Interrupt_ID (IMNG.Abort_Task_Interrupt));
- end if;
-
- Unlock_Interrupt (Self_ID, Interrupt);
- end Block_Interrupt;
-
- or accept Unblock_Interrupt (Interrupt : Interrupt_ID) do
- Lock_Interrupt (Self_ID, Interrupt);
-
- if not Blocked (Interrupt) then
- Unlock_Interrupt (Self_ID, Interrupt);
- return;
- end if;
-
- Blocked (Interrupt) := False;
- Last_Unblocker (Interrupt) :=
- To_System (Unblock_Interrupt'Caller);
-
- if User_Handler (Interrupt).H = null
- and then User_Entry (Interrupt).T = Null_Task
- then
- -- No handler is attached. Unmask the Interrupt so that
- -- the default action can be carried out.
- IMOP.Thread_Unblock_Interrupt
- (IMNG.Interrupt_ID (Interrupt));
-
- else
- -- The Server_Task must be waiting on the Cond variable
- -- since it was being blocked and an Interrupt Hander or
- -- an Entry was there. Wake it up and let it change
- -- it place of waiting according to its new state.
- POP.Wakeup (Server_ID (Interrupt),
- Interrupt_Server_Blocked_Interrupt_Sleep);
- end if;
-
- Unlock_Interrupt (Self_ID, Interrupt);
- end Unblock_Interrupt;
-
- or accept Ignore_Interrupt (Interrupt : Interrupt_ID) do
- Lock_Interrupt (Self_ID, Interrupt);
-
- if Ignored (Interrupt) then
- Unlock_Interrupt (Self_ID, Interrupt);
- return;
- end if;
-
- Ignored (Interrupt) := True;
-
- -- If there is a handler associated with the Interrupt,
- -- detach it first. In this way we make sure that the
- -- Server_Task is not on sigwait. This is legal since
- -- Unignore_Interrupt is to install the default action.
-
- if User_Handler (Interrupt).H /= null then
- Unprotected_Detach_Handler
- (Interrupt => Interrupt, Static => True);
-
- elsif User_Entry (Interrupt).T /= Null_Task then
- User_Entry (Interrupt) := Entry_Assoc'
- (T => Null_Task, E => Null_Task_Entry);
- Unbind_Handler (Interrupt);
- end if;
-
- IMOP.Install_Ignore_Action (IMNG.Interrupt_ID (Interrupt));
- Unlock_Interrupt (Self_ID, Interrupt);
- end Ignore_Interrupt;
-
- or accept Unignore_Interrupt (Interrupt : Interrupt_ID) do
- Lock_Interrupt (Self_ID, Interrupt);
- Ignored (Interrupt) := False;
-
- -- If there is a handler associated with the Interrupt,
- -- detach it first. In this way we make sure that the
- -- Server_Task is not on sigwait. This is legal since
- -- Unignore_Interrupt is to install the default action.
-
- if User_Handler (Interrupt).H /= null then
- Unprotected_Detach_Handler
- (Interrupt => Interrupt, Static => True);
-
- elsif User_Entry (Interrupt).T /= Null_Task then
- User_Entry (Interrupt) := Entry_Assoc'
- (T => Null_Task, E => Null_Task_Entry);
- Unbind_Handler (Interrupt);
- end if;
-
- IMOP.Install_Default_Action (IMNG.Interrupt_ID (Interrupt));
- Unlock_Interrupt (Self_ID, Interrupt);
- 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
- (Shutdown ("Interrupt_Manager---exception not expected"));
- null;
- end;
-
- end loop;
-
- pragma Assert (Shutdown ("Interrupt_Manager---should not get here"));
-
- end Interrupt_Manager;
-
- -----------------
- -- Server_Task --
- -----------------
-
- task body Server_Task is
- Intwait_Mask : aliased IMNG.Interrupt_Mask;
- Ret_Interrupt : Interrupt_ID;
- Self_ID : Task_ID := Self;
- Tmp_Handler : Parameterless_Handler;
- Tmp_ID : Task_ID;
- Tmp_Entry_Index : Task_Entry_Index;
-
- 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));
-
- -- 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 Interrupt_Manager.
-
- -- There are two Interrupt interrupts that this task catch through
- -- "sigwait." One is the Interrupt this task is designated to catch
- -- in order to execure user handler or entry. The other one is the
- -- Abort_Task_Interrupt. This interrupt is being sent from the
- -- Interrupt_Manager to inform status changes (e.g: become Blocked,
- -- Handler or Entry is to be detached).
-
- -- Prepare a mask to used for sigwait.
-
- IMOP.Empty_Interrupt_Mask (Intwait_Mask'Access);
-
- IMOP.Add_To_Interrupt_Mask
- (Intwait_Mask'Access, IMNG.Interrupt_ID (Interrupt));
-
- IMOP.Add_To_Interrupt_Mask
- (Intwait_Mask'Access, IMNG.Abort_Task_Interrupt);
-
- IMOP.Thread_Block_Interrupt
- (IMNG.Abort_Task_Interrupt);
-
- PIO.Set_Interrupt_ID (IMNG.Interrupt_ID (Interrupt), Self_ID);
-
- loop
- System.Tasking.Initialization.Defer_Abort (Self_ID);
- 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_Blocked_Interrupt_Sleep;
- POP.Sleep (Self_ID, Interrupt_Server_Idle_Sleep);
- Self_ID.Common.State := Runnable;
-
- elsif Blocked (Interrupt) then
-
- -- Interrupt is blocked. Stay here, so we won't catch
- -- the Interrupt.
-
- Self_ID.Common.State := Interrupt_Server_Blocked_Interrupt_Sleep;
- POP.Sleep (Self_ID, Interrupt_Server_Blocked_Interrupt_Sleep);
- Self_ID.Common.State := Runnable;
-
- else
- -- 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 exceute the attached Procedure or Entry.
-
- POP.Unlock (Self_ID);
-
- Ret_Interrupt :=
- Interrupt_ID (IMOP.Interrupt_Wait (Intwait_Mask'Access));
-
- if Ret_Interrupt = Interrupt_ID (IMNG.Abort_Task_Interrupt) then
-
- -- Inform the Interrupt_Manager of wakeup from above sigwait.
-
- POP.Abort_Task (Interrupt_Manager_ID);
- POP.Write_Lock (Self_ID);
-
- else
- pragma Assert (Ret_Interrupt = Interrupt);
-
- POP.Write_Lock (Self_ID);
-
- -- Even though we have received an Interrupt the status may
- -- have changed already before we got the Self_ID lock above.
- -- Therefore we make sure a Handler or an Entry is still
- -- there and make appropriate call.
- -- If there is no calls to make we need to regenerate the
- -- Interrupt in order not to lose it.
-
- 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);
-
- Tmp_Handler.all;
- 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);
-
- System.Tasking.Rendezvous.Call_Simple
- (Tmp_ID, Tmp_Entry_Index, System.Null_Address);
-
- POP.Write_Lock (Self_ID);
- else
- -- This is a situation that this task wake up
- -- receiving an Interrupt and before it get the lock
- -- the Interrupt is blocked. We do not
- -- want to lose the interrupt in this case so that
- -- regenerate the Interrupt to process level;
-
- IMOP.Interrupt_Self_Process (IMNG.Interrupt_ID (Interrupt));
- end if;
- end if;
-
- end if;
-
- POP.Unlock (Self_ID);
- 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;
-
- pragma Assert (Shutdown ("Server_Task---should not get here"));
- end Server_Task;
-
--- 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);
-
- -- Initialize the lock L.
-
- Initialization.Defer_Abort (Self);
- POP.Initialize_Lock (L'Access, POP.PO_Level);
- Initialization.Undefer_Abort (Self);
-
- -- 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;
projects / msp430-gcc.git / blobdiff