| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- |
| -- -- |
| -- S Y S T E M . I N T E R R U P T _ M A N A G E M E N T -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1992-2022, Free Software Foundation, Inc. -- |
| -- -- |
| -- GNARL is free software; you can redistribute it and/or modify it under -- |
| -- terms of the GNU General Public License as published by the Free Soft- -- |
| -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. -- |
| -- -- |
| -- As a special exception under Section 7 of GPL version 3, you are granted -- |
| -- additional permissions described in the GCC Runtime Library Exception, -- |
| -- version 3.1, as published by the Free Software Foundation. -- |
| -- -- |
| -- You should have received a copy of the GNU General Public License and -- |
| -- a copy of the GCC Runtime Library Exception along with this program; -- |
| -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- GNARL was developed by the GNARL team at Florida State University. -- |
| -- Extensive contributions were provided by Ada Core Technologies, Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This is the SuSV3 threads version of this package |
| |
| -- Make a careful study of all signals available under the OS, to see which |
| -- need to be reserved, kept always unmasked, or kept always unmasked. Be on |
| -- the lookout for special signals that may be used by the thread library. |
| |
| -- Since this is a multi target file, the signal <-> exception mapping |
| -- is simple minded. If you need a more precise and target specific |
| -- signal handling, create a new s-intman.adb that will fit your needs. |
| |
| -- This file assumes that: |
| |
| -- SIGINT exists and will be kept unmasked unless the pragma |
| -- Unreserve_All_Interrupts is specified anywhere in the application. |
| |
| -- System.OS_Interface contains the following: |
| -- SIGADAABORT: the signal that will be used to abort tasks. |
| -- Unmasked: the OS specific set of signals that should be unmasked in |
| -- all the threads. SIGADAABORT is unmasked by |
| -- default |
| -- Reserved: the OS specific set of signals that are reserved. |
| |
| package body System.Interrupt_Management is |
| |
| use Interfaces.C; |
| use System.OS_Interface; |
| |
| Unreserve_All_Interrupts : constant Interfaces.C.int; |
| pragma Import |
| (C, Unreserve_All_Interrupts, "__gl_unreserve_all_interrupts"); |
| |
| ----------------------- |
| -- Local Subprograms -- |
| ----------------------- |
| |
| function State (Int : Interrupt_ID) return Character; |
| pragma Import (C, State, "__gnat_get_interrupt_state"); |
| -- Get interrupt state. Defined in init.c The input argument is the |
| -- interrupt number, and the result is one of the following: |
| |
| User : constant Character := 'u'; |
| Runtime : constant Character := 'r'; |
| Default : constant Character := 's'; |
| -- 'n' this interrupt not set by any Interrupt_State pragma |
| -- 'u' Interrupt_State pragma set state to User |
| -- 'r' Interrupt_State pragma set state to Runtime |
| -- 's' Interrupt_State pragma set state to System (use "default" |
| -- system handler) |
| |
| ---------------- |
| -- Initialize -- |
| ---------------- |
| |
| Initialized : Boolean := False; |
| |
| procedure Initialize is |
| begin |
| if Initialized then |
| return; |
| end if; |
| |
| Initialized := True; |
| |
| -- Need to call pthread_init very early because it is doing signal |
| -- initializations. |
| |
| pthread_init; |
| |
| Abort_Task_Interrupt := SIGADAABORT; |
| |
| pragma Assert (Keep_Unmasked = (Interrupt_ID'Range => False)); |
| pragma Assert (Reserve = (Interrupt_ID'Range => False)); |
| |
| -- Process state of exception signals |
| |
| for J in Exception_Signals'Range loop |
| declare |
| Sig : constant Signal := Exception_Signals (J); |
| Id : constant Interrupt_ID := Interrupt_ID (Sig); |
| begin |
| if State (Id) /= User then |
| Keep_Unmasked (Id) := True; |
| Reserve (Id) := True; |
| end if; |
| end; |
| end loop; |
| |
| if State (Abort_Task_Interrupt) /= User then |
| Keep_Unmasked (Abort_Task_Interrupt) := True; |
| Reserve (Abort_Task_Interrupt) := True; |
| end if; |
| |
| -- Set SIGINT to unmasked state as long as it is not in "User" state. |
| -- Check for Unreserve_All_Interrupts last. |
| |
| if State (SIGINT) /= User then |
| Keep_Unmasked (SIGINT) := True; |
| Reserve (SIGINT) := True; |
| end if; |
| |
| -- Check all signals for state that requires keeping them unmasked and |
| -- reserved. |
| |
| for J in Interrupt_ID'Range loop |
| if State (J) = Default or else State (J) = Runtime then |
| Keep_Unmasked (J) := True; |
| Reserve (J) := True; |
| end if; |
| end loop; |
| |
| -- Add the set of signals that must always be unmasked for this target |
| |
| for J in Unmasked'Range loop |
| Keep_Unmasked (Interrupt_ID (Unmasked (J))) := True; |
| Reserve (Interrupt_ID (Unmasked (J))) := True; |
| end loop; |
| |
| -- Add target-specific reserved signals |
| |
| for J in Reserved'Range loop |
| Reserve (Interrupt_ID (Reserved (J))) := True; |
| end loop; |
| |
| -- Process pragma Unreserve_All_Interrupts. This overrides any settings |
| -- due to pragma Interrupt_State: |
| |
| if Unreserve_All_Interrupts /= 0 then |
| Keep_Unmasked (SIGINT) := False; |
| Reserve (SIGINT) := False; |
| end if; |
| |
| -- We do not really have Signal 0. We just use this value to identify |
| -- non-existent signals (see s-intnam.ads). Therefore, Signal should not |
| -- be used in all signal related operations hence mark it as reserved. |
| |
| Reserve (0) := True; |
| end Initialize; |
| |
| end System.Interrupt_Management; |
