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Diffstat (limited to 'gcc/ada/5ztaspri.ads')
| -rw-r--r-- | gcc/ada/5ztaspri.ads | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/gcc/ada/5ztaspri.ads b/gcc/ada/5ztaspri.ads new file mode 100644 index 00000000000..efd41ccd984 --- /dev/null +++ b/gcc/ada/5ztaspri.ads @@ -0,0 +1,95 @@ +------------------------------------------------------------------------------ +-- -- +-- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS -- +-- -- +-- S Y S T E M . T A S K _ P R I M I T I V E S -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 2001-2002 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 VxWorks version of this package. + +pragma Polling (Off); +-- Turn off polling, we do not want ATC polling to take place during +-- tasking operations. It causes infinite loops and other problems. + +with System.OS_Interface; + +package System.Task_Primitives is + + type Lock is limited private; + -- Should be used for implementation of protected objects. + + type RTS_Lock is limited private; + -- Should be used inside the runtime system. + -- The difference between Lock and the RTS_Lock is that the later + -- one serves only as a semaphore so that do not check for + -- ceiling violations. + + type Task_Body_Access is access procedure; + -- Pointer to the task body's entry point (or possibly a wrapper + -- declared local to the GNARL). + + type Private_Data is limited private; + -- Any information that the GNULLI needs maintained on a per-task + -- basis. A component of this type is guaranteed to be included + -- in the Ada_Task_Control_Block. + +private + + type Priority_Type is (Prio_None, Prio_Protect, Prio_Inherit); + + type Lock is record + Mutex : System.OS_Interface.SEM_ID; + Protocol : Priority_Type; + Prio_Ceiling : System.OS_Interface.int; + -- priority ceiling of lock + end record; + + type RTS_Lock is new Lock; + + type Private_Data is record + Thread : aliased System.OS_Interface.t_id := 0; + pragma Atomic (Thread); + -- Thread field may be updated by two different threads of control. + -- (See, Enter_Task and Create_Task in s-taprop.adb). + -- They put the same value (thr_self value). We do not want to + -- use lock on those operations and the only thing we have to + -- make sure is that they are updated in atomic fashion. + + LWP : aliased System.Address; + -- The purpose of this field is to provide a better tasking support on + -- gdb. The order of the two first fields (Thread and LWP) is important. + -- On targets where lwp is not relevant, this is equivalent to Thread. + + CV : aliased System.OS_Interface.SEM_ID; + + L : aliased RTS_Lock; + -- Protection for all components is lock L + end record; + +end System.Task_Primitives; |