aboutsummaryrefslogtreecommitdiffstats
path: root/gcc-4.3.1/gcc/ada/s-taspri-hpux-dce.ads
diff options
context:
space:
mode:
Diffstat (limited to 'gcc-4.3.1/gcc/ada/s-taspri-hpux-dce.ads')
-rw-r--r--gcc-4.3.1/gcc/ada/s-taspri-hpux-dce.ads111
1 files changed, 111 insertions, 0 deletions
diff --git a/gcc-4.3.1/gcc/ada/s-taspri-hpux-dce.ads b/gcc-4.3.1/gcc/ada/s-taspri-hpux-dce.ads
new file mode 100644
index 000000000..311df3fca
--- /dev/null
+++ b/gcc-4.3.1/gcc/ada/s-taspri-hpux-dce.ads
@@ -0,0 +1,111 @@
+------------------------------------------------------------------------------
+-- --
+-- 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) 1991-2005 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, 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 HP-UX version of this package
+
+-- This package provides low-level support for most tasking features
+
+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;
+-- used for pthread_mutex_t
+-- pthread_cond_t
+-- pthread_t
+
+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.
+
+private
+ type Lock is record
+ L : aliased System.OS_Interface.pthread_mutex_t;
+ Priority : Integer;
+ Owner_Priority : Integer;
+ 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.
+
+ 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;