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Diffstat (limited to 'gcc/ada/s-tpopsp-lynxos.adb')
| -rw-r--r-- | gcc/ada/s-tpopsp-lynxos.adb | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/gcc/ada/s-tpopsp-lynxos.adb b/gcc/ada/s-tpopsp-lynxos.adb new file mode 100644 index 00000000000..2673d0e30b6 --- /dev/null +++ b/gcc/ada/s-tpopsp-lynxos.adb @@ -0,0 +1,113 @@ +------------------------------------------------------------------------------ +-- -- +-- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS -- +-- -- +-- SYSTEM.TASK_PRIMITIVES.OPERATIONS.SPECIFIC -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 1992-2004, 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 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 a LynxOS version of this package. + +separate (System.Task_Primitives.Operations) +package body Specific is + + ---------------- + -- Initialize -- + ---------------- + + procedure Initialize (Environment_Task : Task_ID) is + pragma Warnings (Off, Environment_Task); + Result : Interfaces.C.int; + + begin + Result := st_keycreate (null, ATCB_Key'Access); + pragma Assert (Result = 0); + end Initialize; + + ------------------- + -- Is_Valid_Task -- + ------------------- + + function Is_Valid_Task return Boolean is + Result : Interfaces.C.int; + Value : aliased System.Address; + begin + Result := st_getspecific (ATCB_Key, Value'Address); + pragma Assert (Result = 0); + return (Value /= System.Null_Address); + end Is_Valid_Task; + + --------- + -- Set -- + --------- + + procedure Set (Self_Id : Task_ID) is + Result : Interfaces.C.int; + + begin + Result := st_setspecific (ATCB_Key, To_Address (Self_Id)); + pragma Assert (Result = 0); + end Set; + + ---------- + -- Self -- + ---------- + + -- To make Ada tasks and C threads interoperate better, we have added some + -- functionality to Self. Suppose a C main program (with threads) calls an + -- Ada procedure and the Ada procedure calls the tasking runtime system. + -- Eventually, a call will be made to self. Since the call is not coming + -- from an Ada task, there will be no corresponding ATCB. + + -- What we do in Self is to catch references that do not come from + -- recognized Ada tasks, and create an ATCB for the calling thread. + + -- The new ATCB will be "detached" from the normal Ada task master + -- hierarchy, much like the existing implicitly created signal-server + -- tasks. + + function Self return Task_ID is + Value : aliased System.Address; + + Result : Interfaces.C.int; + pragma Unreferenced (Result); + + begin + Result := st_getspecific (ATCB_Key, Value'Address); + -- Is it OK not to check this result??? + + -- If the key value is Null, then it is a non-Ada task. + + if Value /= System.Null_Address then + return To_Task_ID (Value); + else + return Register_Foreign_Thread; + end if; + end Self; + +end Specific; |