URL
https://opencores.org/ocsvn/openrisc/openrisc/trunk
Subversion Repositories openrisc
[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc3/] [gcc/] [ada/] [s-taspri-lynxos.ads] - Rev 593
Go to most recent revision | Compare with Previous | Blame | View Log
------------------------------------------------------------------------------ -- -- -- GNAT 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) 1991-1994, Florida State University -- -- Copyright (C) 1995-2008, AdaCore -- -- -- -- 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, 51 Franklin Street, Fifth Floor, -- -- Boston, MA 02110-1301, 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, derived from s-taspri-posix.ads 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 pragma Preelaborate; 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 Suspension_Object is limited private; -- Should be used for the implementation of Ada.Synchronous_Task_Control 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. subtype Task_Address is System.Address; -- In some versions of Task_Primitives, notably for VMS, Task_Address is -- the short version of address defined in System.Aux_DEC. To avoid -- dragging Aux_DEC into tasking packages a tasking specific subtype is -- defined here. Task_Address_Size : constant := Standard'Address_Size; -- The size of Task_Address Alternate_Stack_Size : constant := 0; -- No alternate signal stack is used on this platform private type Lock is record Mutex : aliased System.OS_Interface.pthread_mutex_t; Ceiling : System.Any_Priority; Saved_Priority : System.Any_Priority; end record; type RTS_Lock is new System.OS_Interface.pthread_mutex_t; type Suspension_Object is record State : Boolean; pragma Atomic (State); -- Boolean that indicates whether the object is open. This field is -- marked Atomic to ensure that we can read its value without locking -- the access to the Suspension_Object. Waiting : Boolean; -- Flag showing if there is a task already suspended on this object L : aliased System.OS_Interface.pthread_mutex_t; -- Protection for ensuring mutual exclusion on the Suspension_Object CV : aliased System.OS_Interface.pthread_cond_t; -- Condition variable used to queue threads until condition is signaled end record; type Private_Data is record Thread : aliased System.OS_Interface.pthread_t; 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.pthread_cond_t; L : aliased RTS_Lock; -- Protection for all components is lock L end record; end System.Task_Primitives;
Go to most recent revision | Compare with Previous | Blame | View Log