From c32d045231e086867f117700fbe01dbbbce3ea14 Mon Sep 17 00:00:00 2001 From: kenner Date: Tue, 2 Oct 2001 14:30:19 +0000 Subject: New Language: Ada git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45957 138bc75d-0d04-0410-961f-82ee72b054a4 --- gcc/ada/s-interr.adb | 1572 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1572 insertions(+) create mode 100644 gcc/ada/s-interr.adb (limited to 'gcc/ada/s-interr.adb') diff --git a/gcc/ada/s-interr.adb b/gcc/ada/s-interr.adb new file mode 100644 index 00000000000..03db2ff1512 --- /dev/null +++ b/gcc/ada/s-interr.adb @@ -0,0 +1,1572 @@ +------------------------------------------------------------------------------ +-- -- +-- 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: 1.36 $ +-- -- +-- 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. It is -- +-- now maintained by Ada Core Technologies Inc. in cooperation with Florida -- +-- State University (http://www.gnat.com). -- +-- -- +------------------------------------------------------------------------------ + +-- 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 explicitely 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 explicitely 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; -- cgit v1.2.1