------------------------------------------------------------------------------ -- -- -- 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) 1992-2020, 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 -- -- . -- -- -- -- 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 : 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;