X-Git-Url: https://oss.titaniummirror.com/gitweb?a=blobdiff_plain;f=gcc%2Fada%2Fs-interr.adb;fp=gcc%2Fada%2Fs-interr.adb;h=0000000000000000000000000000000000000000;hb=6fed43773c9b0ce596dca5686f37ac3fc0fa11c0;hp=085bf16b2232daede306e061b3ac2a6216bde064;hpb=27b11d56b743098deb193d510b337ba22dc52e5c;p=msp430-gcc.git diff --git a/gcc/ada/s-interr.adb b/gcc/ada/s-interr.adb deleted file mode 100644 index 085bf16b..00000000 --- a/gcc/ada/s-interr.adb +++ /dev/null @@ -1,1571 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- 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;