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------------------------------------------------------------------------------ -- -- -- 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) 1995-2010, AdaCore -- -- -- -- GNAT 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 a SGI Pthread 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. package body System.Interrupt_Management is use System.OS_Interface; type Interrupt_List is array (Interrupt_ID range <>) of Interrupt_ID; Exception_Interrupts : constant Interrupt_List := (SIGTSTP, SIGILL, SIGTRAP, SIGEMT, SIGFPE, SIGBUS, SIGSTOP, SIGKILL, SIGSEGV, SIGSYS, SIGXCPU, SIGXFSZ, SIGPROF, SIGPTINTR, SIGPTRESCHED, SIGABRT, SIGPIPE); Unreserve_All_Interrupts : Interfaces.C.int; pragma Import (C, Unreserve_All_Interrupts, "__gl_unreserve_all_interrupts"); function State (Int : Interrupt_ID) return Character; pragma Import (C, State, "__gnat_get_interrupt_state"); -- Get interrupt state. Defined in a-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 use type Interfaces.C.int; begin if Initialized then return; end if; Initialized := True; Abort_Task_Interrupt := SIGABRT; -- Change this if you want to use another signal for task abort. -- SIGTERM might be a good one. pragma Assert (Keep_Unmasked = (Interrupt_ID'Range => False)); pragma Assert (Reserve = (Interrupt_ID'Range => False)); -- Process state of exception signals for J in Exception_Interrupts'Range loop if State (Exception_Interrupts (J)) /= User then Keep_Unmasked (Exception_Interrupts (J)) := True; Reserve (Exception_Interrupts (J)) := True; end if; 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's -- not in "User" state. Check for Unreserve_All_Interrupts last if State (SIGINT) /= User then Keep_Unmasked (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; -- 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 have Signal 0 in reality. We just use this value -- to identify not existing signals (see s-intnam.ads). Therefore, -- Signal 0 should not be used in all signal related operations hence -- mark it as reserved. Reserve (0) := True; end Initialize; end System.Interrupt_Management;
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