------------------------------------------------------------------------------ -- -- -- GNU ADA 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) 1991-1994, Florida State University -- -- Copyright (C) 1995-2003, Ada Core Technologies -- -- -- -- 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. -- -- -- ------------------------------------------------------------------------------ -- This is an Irix (old pthread library) version of this package. -- PLEASE DO NOT add any dependences on other packages. -- This package is designed to work with or without tasking support. -- 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. with System.OS_Interface; -- used for various Constants, Signal and types with Interfaces.C; -- used for "int" 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 := (SIGILL, SIGABRT, SIGFPE, SIGSEGV, SIGBUS); Reserved_Interrupts : constant Interrupt_List := (0, SIGTRAP, SIGKILL, SIGSYS, SIGALRM, SIGSTOP, SIGPTINTR, SIGPTRESCHED); Abort_Signal : constant := 48; -- -- Serious MOJO: The SGI pthreads library only supports the -- unnamed signal number 48 for pthread_kill! -- Unreserve_All_Interrupts : Interfaces.C.int; pragma Import (C, Unreserve_All_Interrupts, "__gl_unreserve_all_interrupts"); ---------------------- -- Notify_Exception -- ---------------------- -- This function identifies the Ada exception to be raised using the -- information when the system received a synchronous signal. -- Since this function is machine and OS dependent, different code has to -- be provided for different target. -- On SGI, the signal handling is done is a-init.c, even when tasking is -- involved. --------------------------- -- Initialize_Interrupts -- --------------------------- -- Nothing needs to be done on this platform. procedure Initialize_Interrupts is begin null; end Initialize_Interrupts; begin declare 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) use Interfaces.C; begin Abort_Task_Interrupt := Abort_Signal; 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; -- Add target-specific reserved signals for J in Reserved_Interrupts'Range loop Reserve (Interrupt_ID (Reserved_Interrupts (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 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; end System.Interrupt_Management;