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Diffstat (limited to 'gcc/ada/s-intman-irix-athread.adb')
| -rw-r--r-- | gcc/ada/s-intman-irix-athread.adb | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/gcc/ada/s-intman-irix-athread.adb b/gcc/ada/s-intman-irix-athread.adb new file mode 100644 index 00000000000..57771303f16 --- /dev/null +++ b/gcc/ada/s-intman-irix-athread.adb @@ -0,0 +1,184 @@ +------------------------------------------------------------------------------ +-- -- +-- 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; |