| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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; |
