From 1bc5aee63eb72b341f506ad058502cd0361f0d10 Mon Sep 17 00:00:00 2001 From: Ben Cheng Date: Tue, 25 Mar 2014 22:37:19 -0700 Subject: Initial checkin of GCC 4.9.0 from trunk (r208799). Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba --- gcc-4.9/gcc/ada/s-tpoben.ads | 240 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 240 insertions(+) create mode 100644 gcc-4.9/gcc/ada/s-tpoben.ads (limited to 'gcc-4.9/gcc/ada/s-tpoben.ads') diff --git a/gcc-4.9/gcc/ada/s-tpoben.ads b/gcc-4.9/gcc/ada/s-tpoben.ads new file mode 100644 index 000000000..8a91bbb03 --- /dev/null +++ b/gcc-4.9/gcc/ada/s-tpoben.ads @@ -0,0 +1,240 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- +-- -- +-- SYSTEM.TASKING.PROTECTED_OBJECTS.ENTRIES -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 1992-2012, 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 3, or (at your option) any later ver- -- +-- sion. GNAT 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. -- +-- -- +-- As a special exception under Section 7 of GPL version 3, you are granted -- +-- additional permissions described in the GCC Runtime Library Exception, -- +-- version 3.1, as published by the Free Software Foundation. -- +-- -- +-- You should have received a copy of the GNU General Public License and -- +-- a copy of the GCC Runtime Library Exception along with this program; -- +-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- +-- . -- +-- -- +-- GNARL was developed by the GNARL team at Florida State University. -- +-- Extensive contributions were provided by Ada Core Technologies, Inc. -- +-- -- +------------------------------------------------------------------------------ + +-- This package contains all simple primitives related to Protected_Objects +-- with entries (i.e init, lock, unlock). + +-- The handling of protected objects with no entries is done in +-- System.Tasking.Protected_Objects, the complex routines for protected +-- objects with entries in System.Tasking.Protected_Objects.Operations. + +-- The split between Entries and Operations is needed to break circular +-- dependencies inside the run time. + +-- Note: the compiler generates direct calls to this interface, via Rtsfind. +-- Any changes to this interface may require corresponding compiler changes. + +with Ada.Finalization; +with Ada.Unchecked_Conversion; + +package System.Tasking.Protected_Objects.Entries is + pragma Elaborate_Body; + + subtype Positive_Protected_Entry_Index is + Protected_Entry_Index range 1 .. Protected_Entry_Index'Last; + + type Find_Body_Index_Access is access + function + (O : System.Address; + E : Protected_Entry_Index) + return Protected_Entry_Index; + + type Protected_Entry_Body_Array is + array (Positive_Protected_Entry_Index range <>) of Entry_Body; + -- Contains executable code for all entry bodies of a protected type + + type Protected_Entry_Body_Access is access all Protected_Entry_Body_Array; + + type Protected_Entry_Queue_Array is + array (Protected_Entry_Index range <>) of Entry_Queue; + + -- The following declarations define an array that contains the string + -- names of entries and entry family members, together with an associated + -- access type. + + type Protected_Entry_Names_Array is + array (Entry_Index range <>) of String_Access; + + type Protected_Entry_Names_Access is access all Protected_Entry_Names_Array; + + -- The following type contains the GNARL state of a protected object. + -- The application-defined portion of the state (i.e. private objects) + -- is maintained by the compiler-generated code. Note that there is a + -- simplified version of this type declared in System.Tasking.PO_Simple + -- that handle the simple case (no entries). + + type Protection_Entries (Num_Entries : Protected_Entry_Index) is new + Ada.Finalization.Limited_Controlled + with record + L : aliased Task_Primitives.Lock; + -- The underlying lock associated with a Protection_Entries. Note + -- that you should never (un)lock Object.L directly, but instead + -- use Lock_Entries/Unlock_Entries. + + Compiler_Info : System.Address; + -- Pointer to compiler-generated record representing protected object + + Call_In_Progress : Entry_Call_Link; + -- Pointer to the entry call being executed (if any) + + Ceiling : System.Any_Priority; + -- Ceiling priority associated with the protected object + + New_Ceiling : System.Any_Priority; + -- New ceiling priority associated to the protected object. In case + -- of assignment of a new ceiling priority to the protected object the + -- frontend generates a call to set_ceiling to save the new value in + -- this field. After such assignment this value can be read by means + -- of the 'Priority attribute, which generates a call to get_ceiling. + -- However, the ceiling of the protected object will not be changed + -- until completion of the protected action in which the assignment + -- has been executed (AARM D.5.2 (10/2)). + + Owner : Task_Id; + -- This field contains the protected object's owner. Null_Task + -- indicates that the protected object is not currently being used. + -- This information is used for detecting the type of potentially + -- blocking operations described in the ARM 9.5.1, par. 15 (external + -- calls on a protected subprogram with the same target object as that + -- of the protected action). + + Old_Base_Priority : System.Any_Priority; + -- Task's base priority when the protected operation was called + + Pending_Action : Boolean; + -- Flag indicating that priority has been dipped temporarily in order + -- to avoid violating the priority ceiling of the lock associated with + -- this protected object, in Lock_Server. The flag tells Unlock_Server + -- or Unlock_And_Update_Server to restore the old priority to + -- Old_Base_Priority. This is needed because of situations (bad + -- language design?) where one needs to lock a PO but to do so would + -- violate the priority ceiling. For example, this can happen when an + -- entry call has been requeued to a lower-priority object, and the + -- caller then tries to cancel the call while its own priority is + -- higher than the ceiling of the new PO. + + Finalized : Boolean := False; + -- Set to True by Finalize to make this routine idempotent + + Entry_Bodies : Protected_Entry_Body_Access; + -- Pointer to an array containing the executable code for all entry + -- bodies of a protected type. + + Find_Body_Index : Find_Body_Index_Access; + -- A function which maps the entry index in a call (which denotes the + -- queue of the proper entry) into the body of the entry. + + Entry_Queues : Protected_Entry_Queue_Array (1 .. Num_Entries); + + Entry_Names : Protected_Entry_Names_Access := null; + -- An array of string names which denotes entry [family member] names. + -- The structure is indexed by protected entry index and contains Num_ + -- Entries components. + end record; + + -- No default initial values for this type, since call records will need to + -- be re-initialized before every use. + + type Protection_Entries_Access is access all Protection_Entries'Class; + -- See comments in s-tassta.adb about the implicit call to Current_Master + -- generated by this declaration. + + function To_Address is + new Ada.Unchecked_Conversion (Protection_Entries_Access, System.Address); + function To_Protection is + new Ada.Unchecked_Conversion (System.Address, Protection_Entries_Access); + + function Get_Ceiling + (Object : Protection_Entries_Access) return System.Any_Priority; + -- Returns the new ceiling priority of the protected object + + function Has_Interrupt_Or_Attach_Handler + (Object : Protection_Entries_Access) return Boolean; + -- Returns True if an Interrupt_Handler or Attach_Handler pragma applies + -- to the protected object. That is to say this primitive returns False for + -- Protection, but is overridden to return True when interrupt handlers are + -- declared so the check required by C.3.1(11) can be implemented in + -- System.Tasking.Protected_Objects.Initialize_Protection. + + procedure Initialize_Protection_Entries + (Object : Protection_Entries_Access; + Ceiling_Priority : Integer; + Compiler_Info : System.Address; + Entry_Bodies : Protected_Entry_Body_Access; + Find_Body_Index : Find_Body_Index_Access); + -- Initialize the Object parameter so that it can be used by the runtime + -- to keep track of the runtime state of a protected object. + + procedure Lock_Entries (Object : Protection_Entries_Access); + -- Lock a protected object for write access. Upon return, the caller owns + -- the lock to this object, and no other call to Lock or Lock_Read_Only + -- with the same argument will return until the corresponding call to + -- Unlock has been made by the caller. Program_Error is raised in case of + -- ceiling violation. + + procedure Lock_Entries_With_Status + (Object : Protection_Entries_Access; + Ceiling_Violation : out Boolean); + -- Same as above, but return the ceiling violation status instead of + -- raising Program_Error. + + procedure Lock_Read_Only_Entries (Object : Protection_Entries_Access); + -- Lock a protected object for read access. Upon return, the caller owns + -- the lock for read access, and no other calls to Lock with the same + -- argument will return until the corresponding call to Unlock has been + -- made by the caller. Other calls to Lock_Read_Only may (but need not) + -- return before the call to Unlock, and the corresponding callers will + -- also own the lock for read access. + -- + -- Note: we are not currently using this interface, it is provided for + -- possible future use. At the current time, everyone uses Lock for both + -- read and write locks. + + function Number_Of_Entries + (Object : Protection_Entries_Access) return Entry_Index; + -- Return the number of entries of a protected object + + procedure Set_Ceiling + (Object : Protection_Entries_Access; + Prio : System.Any_Priority); + -- Sets the new ceiling priority of the protected object + + procedure Set_Entry_Names + (Object : Protection_Entries_Access; + Names : Protected_Entry_Names_Access); + -- Associate an array of string that denote entry [family] names with a + -- protected object. + + procedure Unlock_Entries (Object : Protection_Entries_Access); + -- Relinquish ownership of the lock for the object represented by the + -- Object parameter. If this ownership was for write access, or if it was + -- for read access where there are no other read access locks outstanding, + -- one (or more, in the case of Lock_Read_Only) of the tasks waiting on + -- this lock (if any) will be given the lock and allowed to return from + -- the Lock or Lock_Read_Only call. + +private + + overriding procedure Finalize (Object : in out Protection_Entries); + -- Clean up a Protection object; in particular, finalize the associated + -- Lock object. + +end System.Tasking.Protected_Objects.Entries; -- cgit v1.2.3