diff options
Diffstat (limited to 'gcc/ada/5zinterr.adb')
| -rw-r--r-- | gcc/ada/5zinterr.adb | 769 |
1 files changed, 121 insertions, 648 deletions
diff --git a/gcc/ada/5zinterr.adb b/gcc/ada/5zinterr.adb index e7422ef614b..dccc143a6c6 100644 --- a/gcc/ada/5zinterr.adb +++ b/gcc/ada/5zinterr.adb @@ -6,9 +6,9 @@ -- -- -- B o d y -- -- -- --- $Revision: 1.1 $ +-- $Revision$ -- -- --- Copyright (C) 1991-2001 Free Software Foundation, Inc. -- +-- Copyright (C) 1992-2002, 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- -- @@ -29,8 +29,7 @@ -- 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). -- +-- now maintained by Ada Core Technologies, Inc. (http://www.gnat.com). -- -- -- ------------------------------------------------------------------------------ @@ -46,13 +45,6 @@ -- hardware interrupts, which may be masked or unmasked using routined -- interfaced to the relevant VxWorks system calls. --- Note : Direct calls to sigaction, sigprocmask, pthread_sigsetmask or any --- other low-level interface that changes the signal action or --- signal mask needs careful consideration. --- One may achieve the effect of system calls first masking RTS blocked --- (by calling Block_Interrupt) for the signal under consideration. --- This will make all the tasks in RTS blocked for the signal. - -- Once we associate a Signal_Server_Task with an signal, the task never -- goes away, and we never remove the association. On the other hand, it -- is more convenient to terminate an associated Interrupt_Server_Task @@ -72,15 +64,13 @@ -- service requests are ensured via user calls to the Interrupt_Manager -- entries. --- This is the VxWorks version of this package, supporting both signals --- and vectored hardware interrupts. +-- This is the VxWorks version of this package, supporting vectored hardware +-- interrupts. with Unchecked_Conversion; with System.OS_Interface; use System.OS_Interface; -with System.VxWorks; - with Interfaces.VxWorks; with Ada.Task_Identification; @@ -89,39 +79,6 @@ with Ada.Task_Identification; 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 @@ -130,9 +87,6 @@ with System.Task_Primitives.Operations; -- Sleep -- Initialize_Lock -with System.Task_Primitives.Interrupt_Operations; --- used for Set_Interrupt_ID - with System.Storage_Elements; -- used for To_Address -- To_Integer @@ -152,21 +106,13 @@ with System.Tasking.Rendezvous; -- used for Call_Simple pragma Elaborate_All (System.Tasking.Rendezvous); -with System.Tasking.Initialization; --- used for Defer_Abort --- Undefer_Abort - 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_Ada is new Unchecked_Conversion (System.Tasking.Task_ID, Ada.Task_Identification.Task_Id); @@ -178,12 +124,12 @@ package body System.Interrupts is -- Local Tasks -- ----------------- - -- WARNING: System.Tasking.Utilities performs calls to this task + -- WARNING: System.Tasking.Stages 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 Detach_Interrupt_Entries (T : Task_ID); entry Attach_Handler (New_Handler : Parameterless_Handler; @@ -206,18 +152,9 @@ package body System.Interrupts is E : Task_Entry_Index; Interrupt : Interrupt_ID); - entry Detach_Interrupt_Entries (T : Task_ID); - pragma Interrupt_Priority (System.Interrupt_Priority'First); end Interrupt_Manager; - task type Signal_Server_Task (Interrupt : Interrupt_ID) is - pragma Interrupt_Priority (System.Interrupt_Priority'First + 1); - end Signal_Server_Task; - -- Server task for signal handling - - type Signal_Task_Access is access Signal_Server_Task; - task type Interrupt_Server_Task (Interrupt : Interrupt_ID; Int_Sema : SEM_ID) is -- Server task for vectored hardware interrupt handling @@ -275,33 +212,16 @@ package body System.Interrupts is -- is needed to determine whether to create a new Server_Task. Semaphore_ID_Map : array - (Interrupt_ID range 0 .. System.VxWorks.Num_HW_Interrupts) of SEM_ID := - (others => 0); + (Interrupt_ID range 0 .. System.OS_Interface.Max_HW_Interrupt) + of SEM_ID := (others => 0); -- Array of binary semaphores associated with vectored interrupts -- Note that the last bound should be Max_HW_Interrupt, but this will raise -- Storage_Error if Num_HW_Interrupts is null, so use an extra 4 bytes -- instead. - Signal_Access_Hold : Signal_Task_Access; - -- Variable for allocating a Signal_Server_Task - Interrupt_Access_Hold : Interrupt_Task_Access; -- Variable for allocating an Interrupt_Server_Task - L : aliased PRI.RTS_Lock; - -- L protects the contents of the above tables for interrupts / signals - -- for which Server_ID (I) = Null_Task. - -- - -- If Server_ID (I) /= Null_Task then protection is via the - -- per-task (TCB) lock of Server_ID (I). - -- - -- 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) of Boolean := (others => False); - -- Booleans indicating whether the per task lock is used - Default_Handler : array (HW_Interrupt) of Interfaces.VxWorks.VOIDFUNCPTR; -- Vectored interrupt handlers installed prior to program startup. -- These are saved only when the umbrella handler is installed for @@ -319,25 +239,9 @@ package body System.Interrupts is -- Unbind the handlers for hardware interrupt server tasks at program -- termination. - procedure Lock_Interrupt - (Self_ID : Task_ID; - Interrupt : Interrupt_ID); - -- Protect the tables using L or the 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); - -- Unlock interrupt previously locked by Lock_Interrupt - function Is_Registered (Handler : Parameterless_Handler) return Boolean; - -- Needs comment ??? + -- See if Handler has been "pragma"ed using Interrupt_Handler. + -- Always consider a null handler as registered. procedure Notify_Interrupt (Param : System.Address); -- Umbrella handler for vectored interrupts (not signals) @@ -351,9 +255,6 @@ package body System.Interrupts is -- Install the runtime umbrella handler for a vectored hardware -- interrupt - function To_Signal (S : Interrupt_ID) return IMNG.Interrupt_ID; - -- Convert interrupt ID to signal number. - procedure Unimplemented (Feature : String); pragma No_Return (Unimplemented); -- Used to mark a call to an unimplemented function. Raises Program_Error @@ -374,8 +275,7 @@ package body System.Interrupts is procedure Attach_Handler (New_Handler : Parameterless_Handler; Interrupt : Interrupt_ID; - Static : Boolean := False) - is + Static : Boolean := False) is begin Check_Reserved_Interrupt (Interrupt); Interrupt_Manager.Attach_Handler (New_Handler, Interrupt, Static); @@ -395,7 +295,7 @@ package body System.Interrupts is Int_Ref : System.Address) is Interrupt : constant Interrupt_ID := - Interrupt_ID (Storage_Elements.To_Integer (Int_Ref)); + Interrupt_ID (Storage_Elements.To_Integer (Int_Ref)); begin Check_Reserved_Interrupt (Interrupt); @@ -431,9 +331,7 @@ package body System.Interrupts is --------------------- function Current_Handler - (Interrupt : Interrupt_ID) - return Parameterless_Handler - is + (Interrupt : Interrupt_ID) return Parameterless_Handler is begin Check_Reserved_Interrupt (Interrupt); @@ -457,8 +355,7 @@ package body System.Interrupts is procedure Detach_Handler (Interrupt : Interrupt_ID; - Static : Boolean := False) - is + Static : Boolean := False) is begin Check_Reserved_Interrupt (Interrupt); Interrupt_Manager.Detach_Handler (Interrupt, Static); @@ -489,8 +386,7 @@ package body System.Interrupts is (Old_Handler : out Parameterless_Handler; New_Handler : Parameterless_Handler; Interrupt : Interrupt_ID; - Static : Boolean := False) - is + Static : Boolean := False) is begin Check_Reserved_Interrupt (Interrupt); Interrupt_Manager.Exchange_Handler @@ -525,10 +421,9 @@ package body System.Interrupts is -- Finalize_Interrupt_Servers -- -------------------------------- - -- Restore default handlers for interrupt servers. Signal servers - -- restore the default handlers when they're aborted. This is called - -- by the Interrupt_Manager task when it receives the abort signal - -- during program finalization. + -- Restore default handlers for interrupt servers. + -- This is called by the Interrupt_Manager task when it receives the abort + -- signal during program finalization. procedure Finalize_Interrupt_Servers is begin @@ -554,17 +449,13 @@ package body System.Interrupts is ------------------------------------- function Has_Interrupt_Or_Attach_Handler - (Object : access Dynamic_Interrupt_Protection) - return Boolean - is + (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 + (Object : access Static_Interrupt_Protection) return Boolean is begin return True; end Has_Interrupt_Or_Attach_Handler; @@ -628,12 +519,11 @@ package body System.Interrupts is is use Interfaces.VxWorks; - Vec : constant Interrupt_Vector := - INUM_TO_IVEC (Interfaces.VxWorks.int (Interrupt)); + Vec : constant Interrupt_Vector := + INUM_TO_IVEC (Interfaces.VxWorks.int (Interrupt)); Old_Handler : constant VOIDFUNCPTR := - intVecGet - (INUM_TO_IVEC (Interfaces.VxWorks.int (Interrupt))); - Stat : Interfaces.VxWorks.STATUS; + intVecGet (INUM_TO_IVEC (Interfaces.VxWorks.int (Interrupt))); + Stat : Interfaces.VxWorks.STATUS; begin -- Only install umbrella handler when no Ada handler has already been @@ -692,9 +582,6 @@ package body System.Interrupts is -- Is_Registered -- ------------------- - -- See if 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; @@ -725,7 +612,6 @@ package body System.Interrupts is end loop; return False; - end Is_Registered; ----------------- @@ -734,63 +620,12 @@ package body System.Interrupts is function Is_Reserved (Interrupt : Interrupt_ID) return Boolean is begin - if Interrupt < System.VxWorks.Num_HW_Interrupts then - return False; - else - return IMNG.Reserve (To_Signal (Interrupt)); - end if; + return False; 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 - pragma Assert (Server_ID (Interrupt) /= null, - "Task_Lock is true for null server task"); - pragma Assert - (not Ada.Task_Identification.Is_Terminated - (To_Ada (Server_ID (Interrupt))), - "Attempt to lock per task lock of terminated server: " & - "Task_Lock => True"); - - POP.Unlock (L'Access); - POP.Write_Lock (Server_ID (Interrupt)); - - elsif Server_ID (Interrupt) /= Null_Task then - pragma Assert - (not Ada.Task_Identification.Is_Terminated - (To_Ada (Server_ID (Interrupt))), - "Attempt to lock per task lock of terminated server: " & - "Task_Lock => False"); - - Task_Lock (Interrupt) := True; - POP.Unlock (L'Access); - POP.Write_Lock (Server_ID (Interrupt)); - end if; - - end Lock_Interrupt; - - ------------------------ - -- Notify_Interrupt -- - ------------------------ + ---------------------- + -- Notify_Interrupt -- + ---------------------- -- Umbrella handler for vectored hardware interrupts (as opposed to -- signals and exceptions). As opposed to the signal implementation, @@ -859,15 +694,6 @@ package body System.Interrupts is end if; end Register_Interrupt_Handler; - --------------- - -- To_Signal -- - --------------- - - function To_Signal (S : Interrupt_ID) return IMNG.Interrupt_ID is - begin - return IMNG.Interrupt_ID (S - System.VxWorks.Num_HW_Interrupts); - end To_Signal; - ----------------------- -- Unblock_Interrupt -- ----------------------- @@ -908,28 +734,6 @@ package body System.Interrupts is Feature & " not implemented on VxWorks"); end Unimplemented; - ---------------------- - -- Unlock_Interrupt -- - ---------------------- - - procedure Unlock_Interrupt - (Self_ID : Task_ID; - Interrupt : Interrupt_ID) is - begin - if Task_Lock (Interrupt) then - pragma Assert - (not Ada.Task_Identification.Is_Terminated - (To_Ada (Server_ID (Interrupt))), - "Attempt to unlock per task lock of terminated server"); - - POP.Unlock (Server_ID (Interrupt)); - else - POP.Unlock (L'Access); - end if; - - Initialization.Undefer_Abort (Self_ID); - end Unlock_Interrupt; - ----------------------- -- Interrupt_Manager -- ----------------------- @@ -939,9 +743,7 @@ package body System.Interrupts is -- Local Variables -- --------------------- - Intwait_Mask : aliased IMNG.Interrupt_Mask; - Old_Mask : aliased IMNG.Interrupt_Mask; - Self_ID : Task_ID := POP.Self; + Self_Id : constant Task_ID := POP.Self; -------------------- -- Local Routines -- @@ -957,10 +759,6 @@ package body System.Interrupts is -- Otherwise, we have to interrupt Server_Task for status change -- through an abort signal. - -- The following two procedures are labelled Unprotected... in order to - -- indicate that Lock/Unlock_Interrupt operations are needed around - -- around calls to them. - procedure Unprotected_Exchange_Handler (Old_Handler : out Parameterless_Handler; New_Handler : Parameterless_Handler; @@ -978,24 +776,8 @@ package body System.Interrupts is procedure Bind_Handler (Interrupt : Interrupt_ID) is begin - if Interrupt < System.VxWorks.Num_HW_Interrupts then - Install_Umbrella_Handler - (HW_Interrupt (Interrupt), Notify_Interrupt'Access); - - else - -- Mask this task for the given signal so that all tasks - -- are masked for the signal and the actual delivery of the - -- signal will be caught using "sigwait" by the - -- corresponding Server_Task. - - IMOP.Thread_Block_Interrupt (To_Signal (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 signal will be - -- discarded. - - POP.Wakeup (Server_ID (Interrupt), Interrupt_Server_Idle_Sleep); - end if; + Install_Umbrella_Handler + (HW_Interrupt (Interrupt), Notify_Interrupt'Access); end Bind_Handler; -------------------- @@ -1004,44 +786,17 @@ package body System.Interrupts is procedure Unbind_Handler (Interrupt : Interrupt_ID) is S : STATUS; - Ret_Interrupt : IMNG.Interrupt_ID; - - use type IMNG.Interrupt_ID; use type STATUS; begin - if Interrupt < System.VxWorks.Num_HW_Interrupts then - - -- Hardware interrupt + -- Hardware interrupt - Install_Default_Action (HW_Interrupt (Interrupt)); - - -- Flush server task off semaphore, allowing it to terminate - - S := semFlush (Semaphore_ID_Map (Interrupt)); - pragma Assert (S = 0); - - else - -- Currently, there is a handler or an entry attached and - -- the corresponding Server_Task is waiting on "sigwait." - -- We have to wake up the Server_Task and make it - -- wait on a condition variable by sending an - -- Abort_Task_Interrupt + Install_Default_Action (HW_Interrupt (Interrupt)); - -- Make sure corresponding Server_Task is out of its own - -- sigwait state. + -- Flush server task off semaphore, allowing it to terminate - POP.Abort_Task (Server_ID (Interrupt)); - Ret_Interrupt := IMOP.Interrupt_Wait (Intwait_Mask'Access); - pragma Assert (Ret_Interrupt = IMNG.Abort_Task_Interrupt); - - IMOP.Install_Default_Action (To_Signal (Interrupt)); - - -- Unmake the Interrupt for this task in order to allow default - -- action again. - - IMOP.Thread_Unblock_Interrupt (To_Signal (Interrupt)); - end if; + S := semFlush (Semaphore_ID_Map (Interrupt)); + pragma Assert (S = 0); end Unbind_Handler; -------------------------------- @@ -1055,11 +810,9 @@ package body System.Interrupts is Old_Handler : Parameterless_Handler; begin if User_Entry (Interrupt).T /= Null_Task then - -- If an interrupt entry is installed raise -- 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; @@ -1069,11 +822,9 @@ package body System.Interrupts is -- status of the Current_Handler. if not Static and then User_Handler (Interrupt).Static then - -- Trying to detach a static Interrupt Handler. -- raise Program_Error. - Unlock_Interrupt (Self_ID, Interrupt); Raise_Exception (Program_Error'Identity, "Trying to detach a static Interrupt Handler"); end if; @@ -1088,7 +839,6 @@ package body System.Interrupts is if Old_Handler /= null then Unbind_Handler (Interrupt); end if; - end Unprotected_Detach_Handler; ---------------------------------- @@ -1103,13 +853,12 @@ package body System.Interrupts is Restoration : Boolean := False) is begin if User_Entry (Interrupt).T /= Null_Task then - -- If an interrupt entry is already installed, raise -- Program_Error. (propagate it to the caller). - Unlock_Interrupt (Self_ID, Interrupt); - Raise_Exception (Program_Error'Identity, - "An interrupt is already installed"); + Raise_Exception + (Program_Error'Identity, + "An interrupt is already installed"); end if; -- Note : A null handler with Static = True will @@ -1122,15 +871,14 @@ package body System.Interrupts is if not Restoration and then not Static and then (User_Handler (Interrupt).Static - -- Trying to overwrite a static Interrupt Handler with a - -- dynamic Handler + -- Trying to overwrite a static Interrupt Handler with a + -- dynamic Handler - -- The new handler is not specified as an - -- Interrupt Handler by a pragma. + -- The new handler is not specified as an + -- Interrupt Handler by a pragma. - or else not Is_Registered (New_Handler)) + 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 " & @@ -1165,46 +913,23 @@ package body System.Interrupts is Ada.Task_Identification.Is_Terminated (To_Ada (Server_ID (Interrupt)))) 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); - - if Interrupt < System.VxWorks.Num_HW_Interrupts then - - -- Vectored hardware interrupt - - Interrupt_Access_Hold := - new Interrupt_Server_Task - (Interrupt, semBCreate (SEM_Q_FIFO, SEM_EMPTY)); - Server_ID (Interrupt) := - To_System (Interrupt_Access_Hold.all'Identity); - - else - -- Signal - - Signal_Access_Hold := new Signal_Server_Task (Interrupt); - Server_ID (Interrupt) := - To_System (Signal_Access_Hold.all'Identity); - end if; - - IMOP.Set_Interrupt_Mask (Old_Mask'Access); + Interrupt_Access_Hold := + new Interrupt_Server_Task + (Interrupt, semBCreate (SEM_Q_FIFO, SEM_EMPTY)); + Server_ID (Interrupt) := + To_System (Interrupt_Access_Hold.all'Identity); end if; if (New_Handler = null) and then Old_Handler /= null then - -- Restore default handler Unbind_Handler (Interrupt); elsif Old_Handler = null then - -- Save default handler Bind_Handler (Interrupt); end if; - end Unprotected_Exchange_Handler; -- Start of processing for Interrupt_Manager @@ -1215,56 +940,6 @@ package body System.Interrupts is System.Tasking.Utilities.Make_Independent; - -- Environment task gets its own interrupt mask, saves it, - -- and then masks all signals except the Keep_Unmasked set. - - -- During rendezvous, the Interrupt_Manager receives the old - -- signal mask of the environment task, and sets its own - -- signal mask to that value. - - -- The environment task will call this entry of Interrupt_Manager - -- 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 reserved signals - -- being masked (except the Interrupt_Manager) and Keep_Unmasked - -- signals unmasked when created. - - -- Abort_Task_Interrupt is one of the signals unmasked - -- in all tasks. We mask the signal in this particular task - -- so that "sigwait" is can catch an explicit - -- Abort_Task_Interrupt from a Server_Task. - - -- This sigwaiting is needed to ensure that a Signal_Server_Task is - -- out of its own sigwait state. This extra synchronization is - -- necessary to prevent following scenarios: - - -- 1) Interrupt_Manager sends an Abort_Task_Interrupt to a - -- Signal_Server_Task then changes its own signal mask (OS level). - -- If a signal (corresponding to the Signal_Server_Task) arrives - -- in the meantime, we have the Interrupt_Manager umnasked and - -- the Signal_Server_Task waiting on sigwait. - - -- 2) For unbinding a handler, we install a default action in the - -- Interrupt_Manager. POSIX.1c states that the result of using - -- "sigwait" and "sigaction" simultaneously on the same signal - -- is undefined. Therefore, we need to be informed from the - -- Signal_Server_Task that it 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 @@ -1273,142 +948,108 @@ package body System.Interrupts is begin select - accept Attach_Handler (New_Handler : Parameterless_Handler; Interrupt : Interrupt_ID; Static : Boolean; Restoration : 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 : Parameterless_Handler; - Interrupt : Interrupt_ID; - Static : 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 : Interrupt_ID; - Static : 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; - - User_Entry (Interrupt) := Entry_Assoc' (T => T, E => E); - - -- Indicate the attachment of interrupt entry in the ATCB. - -- This is needed so 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 or else - Ada.Task_Identification.Is_Terminated - (To_Ada (Server_ID (Interrupt))) 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); - - if Interrupt < System.VxWorks.Num_HW_Interrupts then - Interrupt_Access_Hold := new Interrupt_Server_Task - (Interrupt, semBCreate (SEM_Q_FIFO, SEM_EMPTY)); - Server_ID (Interrupt) := - To_System (Interrupt_Access_Hold.all'Identity); + or + accept Exchange_Handler + (Old_Handler : out Parameterless_Handler; + New_Handler : Parameterless_Handler; + Interrupt : Interrupt_ID; + Static : Boolean) + do + Unprotected_Exchange_Handler + (Old_Handler, New_Handler, Interrupt, Static); + end Exchange_Handler; - else - Signal_Access_Hold := new Signal_Server_Task (Interrupt); - Server_ID (Interrupt) := - To_System (Signal_Access_Hold.all'Identity); + or + accept Detach_Handler + (Interrupt : Interrupt_ID; + Static : Boolean) + do + Unprotected_Detach_Handler (Interrupt, Static); + end Detach_Handler; + or + accept Bind_Interrupt_To_Entry + (T : Task_ID; + E : Task_Entry_Index; + Interrupt : Interrupt_ID) + do + -- If there is a binding already (either a procedure or an + -- entry), raise Program_Error (propagate it to the caller). + + if User_Handler (Interrupt).H /= null + or else User_Entry (Interrupt).T /= Null_Task + then + Raise_Exception + (Program_Error'Identity, + "A binding for this interrupt is already present"); end if; - IMOP.Set_Interrupt_Mask (Old_Mask'Access); - end if; + User_Entry (Interrupt) := Entry_Assoc' (T => T, E => E); - Bind_Handler (Interrupt); - Unlock_Interrupt (Self_ID, Interrupt); - end Bind_Interrupt_To_Entry; + -- Indicate the attachment of interrupt entry in the ATCB. + -- This is needed so when an interrupt entry task terminates + -- the binding can be cleaned. The call to unbinding must be + -- make by the task before it terminates. - or accept Detach_Interrupt_Entries (T : Task_ID) - do - for Int in Interrupt_ID'Range loop - if not Is_Reserved (Int) then - Lock_Interrupt (Self_ID, Int); + T.Interrupt_Entry := True; - if User_Entry (Int).T = T then + -- Invoke a corresponding Server_Task if not yet created. + -- Place Task_ID info in Server_ID array. - User_Entry (Int) := Entry_Assoc' - (T => Null_Task, E => Null_Task_Entry); - Unbind_Handler (Int); - end if; - - Unlock_Interrupt (Self_ID, Int); + if Server_ID (Interrupt) = Null_Task + or else + Ada.Task_Identification.Is_Terminated + (To_Ada (Server_ID (Interrupt))) + then + Interrupt_Access_Hold := new Interrupt_Server_Task + (Interrupt, semBCreate (SEM_Q_FIFO, SEM_EMPTY)); + Server_ID (Interrupt) := + To_System (Interrupt_Access_Hold.all'Identity); end if; - end loop; - -- Indicate in ATCB that no interrupt entries are attached. + Bind_Handler (Interrupt); + end Bind_Interrupt_To_Entry; + + or + accept Detach_Interrupt_Entries (T : Task_ID) do + for Int in Interrupt_ID'Range loop + if not Is_Reserved (Int) then + if User_Entry (Int).T = T then + User_Entry (Int) := Entry_Assoc' + (T => Null_Task, E => Null_Task_Entry); + Unbind_Handler (Int); + end if; + end if; + end loop; - T.Interrupt_Entry := False; - end Detach_Interrupt_Entries; + -- Indicate in ATCB that no interrupt entries are attached. + T.Interrupt_Entry := False; + end Detach_Interrupt_Entries; 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 E : others => - pragma Assert - (Shutdown ("Interrupt_Manager---exception not expected" & - ASCII.LF & - Exception_Information (E))); + when others => + pragma Assert (False); null; end; end loop; - pragma Assert (Shutdown ("Interrupt_Manager---should not get here")); exception when Standard'Abort_Signal => -- Flush interrupt server semaphores, so they can terminate @@ -1416,149 +1057,6 @@ package body System.Interrupts is raise; end Interrupt_Manager; - ------------------------ - -- Signal_Server_Task -- - ------------------------ - - task body Signal_Server_Task is - Intwait_Mask : aliased IMNG.Interrupt_Mask; - Ret_Interrupt : IMNG.Interrupt_ID; - Self_ID : Task_ID := Self; - Tmp_Handler : Parameterless_Handler; - Tmp_ID : Task_ID; - Tmp_Entry_Index : Task_Entry_Index; - - use type IMNG.Interrupt_ID; - - 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 (To_Signal (Interrupt)); - - -- Note: All tasks in RTS will have all reserved signals - -- masked (except the Interrupt_Manager) and Keep_Unmasked - -- unmasked when created. - - -- Abort_Task_Interrupt is one of the signals unmasked - -- in all tasks. We mask it in this particular task - -- so that "sigwait" can catch an explicit - -- Abort_Task_Interrupt from the Interrupt_Manager. - - -- There are two signals that this task catches through - -- "sigwait." One is the signal it is designated to catch - -- in order to execute an user handler or entry. The other is - -- Abort_Task_Interrupt. This signal is sent from the - -- Interrupt_Manager to inform of status changes (e.g: become Blocked, - -- or a handler or entry is to be detached). - - -- Prepare the mask to be used for sigwait. - - IMOP.Empty_Interrupt_Mask (Intwait_Mask'Access); - - IMOP.Add_To_Interrupt_Mask - (Intwait_Mask'Access, To_Signal (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 (To_Signal (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 signal binding. If a signal is received, - -- Interrupt_Manager will take the default action. - - Self_ID.Common.State := Interrupt_Server_Blocked_Interrupt_Sleep; - POP.Sleep (Self_ID, Interrupt_Server_Idle_Sleep); - Self_ID.Common.State := Runnable; - - else - -- A handler or an entry is installed. At this point all tasks - -- mask for the signal is masked. Catch it using - -- sigwait. - - -- This task may wake up from sigwait by receiving a signal - -- (Abort_Task_Interrupt) from the Interrupt_Manager for unbinding - -- a procedure handler or an entry. Or it could be a wake up - -- from status change (Unblocked -> Blocked). If that is not - -- the case, we should execute the attached procedure or entry. - - POP.Unlock (Self_ID); - - Ret_Interrupt := IMOP.Interrupt_Wait (Intwait_Mask'Access); - - if Ret_Interrupt = 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 - POP.Write_Lock (Self_ID); - - -- Even though we have received a signal, the status may - -- have changed before we got the Self_ID lock above. - -- Therefore we make sure a handler or an entry is still - -- bound and make appropriate call. - -- If there is no call to make we need to regenerate the - -- signal 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 where this task woke up receiving a - -- signal and before it got the lock the signal was blocked. - -- We do not want to lose the signal so we regenerate it at - -- the process level. - - IMOP.Interrupt_Self_Process (Ret_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; - end Signal_Server_Task; - --------------------------- -- Interrupt_Server_Task -- --------------------------- @@ -1566,7 +1064,7 @@ package body System.Interrupts is -- Server task for vectored hardware interrupt handling task body Interrupt_Server_Task is - Self_ID : Task_ID := Self; + Self_Id : constant Task_ID := Self; Tmp_Handler : Parameterless_Handler; Tmp_ID : Task_ID; Tmp_Entry_Index : Task_Entry_Index; @@ -1607,7 +1105,7 @@ package body System.Interrupts is -- Wait for the Interrupt_Manager to complete its work - POP.Write_Lock (Self_ID); + POP.Write_Lock (Self_Id); -- Delete the associated semaphore @@ -1618,9 +1116,8 @@ package body System.Interrupts is -- Set status for the Interrupt_Manager Semaphore_ID_Map (Interrupt) := 0; - Task_Lock (Interrupt) := False; Server_ID (Interrupt) := Null_Task; - POP.Unlock (Self_ID); + POP.Unlock (Self_Id); exit; end if; @@ -1628,31 +1125,7 @@ package body System.Interrupts is end Interrupt_Server_Task; begin - -- Elaboration code for package System.Interrupts - -- 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 the RTS to - -- inherit its signal 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; |
