X-Git-Url: https://oss.titaniummirror.com/gitweb?a=blobdiff_plain;f=gcc%2Fada%2F5atpopsp.adb;fp=gcc%2Fada%2F5atpopsp.adb;h=0000000000000000000000000000000000000000;hb=6fed43773c9b0ce596dca5686f37ac3fc0fa11c0;hp=fdd8f85cac32913e4f98b9c694eaa62e4efc27f5;hpb=27b11d56b743098deb193d510b337ba22dc52e5c;p=msp430-gcc.git diff --git a/gcc/ada/5atpopsp.adb b/gcc/ada/5atpopsp.adb deleted file mode 100644 index fdd8f85c..00000000 --- a/gcc/ada/5atpopsp.adb +++ /dev/null @@ -1,279 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- 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 . O P E R A T I O N S . -- --- S P E C I F I C -- --- -- --- B o d y -- --- -- --- $Revision: 1.2 $ --- -- --- Copyright (C) 1991-2001, Florida State University -- --- -- --- 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. It is -- --- now maintained by Ada Core Technologies Inc. in cooperation with Florida -- --- State University (http://www.gnat.com). -- --- -- ------------------------------------------------------------------------------- - --- This is a POSIX version of this package where foreign threads are --- recognized. --- Currently, DEC Unix, SCO UnixWare, Solaris pthread, HPUX pthread and RTEMS --- use this version. - -with System.Soft_Links; --- used to initialize TSD for a C thread, in function Self - -separate (System.Task_Primitives.Operations) -package body Specific is - - ------------------ - -- Local Data -- - ------------------ - - -- The followings are logically constants, but need to be initialized - -- at run time. - - ATCB_Key : aliased pthread_key_t; - -- Key used to find the Ada Task_ID associated with a thread - - -- The following are used to allow the Self function to - -- automatically generate ATCB's for C threads that happen to call - -- Ada procedure, which in turn happen to call the Ada runtime system. - - type Fake_ATCB; - type Fake_ATCB_Ptr is access Fake_ATCB; - type Fake_ATCB is record - Stack_Base : Interfaces.C.unsigned := 0; - -- A value of zero indicates the node is not in use. - Next : Fake_ATCB_Ptr; - Real_ATCB : aliased Ada_Task_Control_Block (0); - end record; - - Fake_ATCB_List : Fake_ATCB_Ptr; - -- A linear linked list. - -- The list is protected by All_Tasks_L; - -- Nodes are added to this list from the front. - -- Once a node is added to this list, it is never removed. - - Fake_Task_Elaborated : aliased Boolean := True; - -- Used to identified fake tasks (i.e., non-Ada Threads). - - Next_Fake_ATCB : Fake_ATCB_Ptr; - -- Used to allocate one Fake_ATCB in advance. See comment in New_Fake_ATCB - - ----------------------- - -- Local Subprograms -- - ----------------------- - - --------------------------------- - -- Support for New_Fake_ATCB -- - --------------------------------- - - function New_Fake_ATCB return Task_ID; - -- Allocate and Initialize a new ATCB. This code can safely be called from - -- a foreign thread, as it doesn't access implicitly or explicitly - -- "self" before having initialized the new ATCB. - - ------------------- - -- New_Fake_ATCB -- - ------------------- - - function New_Fake_ATCB return Task_ID is - Self_ID : Task_ID; - P, Q : Fake_ATCB_Ptr; - Succeeded : Boolean; - Result : Interfaces.C.int; - - begin - -- This section is ticklish. - -- We dare not call anything that might require an ATCB, until - -- we have the new ATCB in place. - - Write_Lock (All_Tasks_L'Access); - Q := null; - P := Fake_ATCB_List; - - while P /= null loop - if P.Stack_Base = 0 then - Q := P; - end if; - - P := P.Next; - end loop; - - if Q = null then - - -- Create a new ATCB with zero entries. - - Self_ID := Next_Fake_ATCB.Real_ATCB'Access; - Next_Fake_ATCB.Stack_Base := 1; - Next_Fake_ATCB.Next := Fake_ATCB_List; - Fake_ATCB_List := Next_Fake_ATCB; - Next_Fake_ATCB := null; - - else - -- Reuse an existing fake ATCB. - - Self_ID := Q.Real_ATCB'Access; - Q.Stack_Base := 1; - end if; - - -- Record this as the Task_ID for the current thread. - - Self_ID.Common.LL.Thread := pthread_self; - Result := pthread_setspecific (ATCB_Key, To_Address (Self_ID)); - pragma Assert (Result = 0); - - -- Do the standard initializations - - System.Tasking.Initialize_ATCB - (Self_ID, null, Null_Address, Null_Task, Fake_Task_Elaborated'Access, - System.Priority'First, Task_Info.Unspecified_Task_Info, 0, Self_ID, - Succeeded); - pragma Assert (Succeeded); - - -- Finally, it is safe to use an allocator in this thread. - - if Next_Fake_ATCB = null then - Next_Fake_ATCB := new Fake_ATCB; - end if; - - Self_ID.Master_of_Task := 0; - Self_ID.Master_Within := Self_ID.Master_of_Task + 1; - - for L in Self_ID.Entry_Calls'Range loop - Self_ID.Entry_Calls (L).Self := Self_ID; - Self_ID.Entry_Calls (L).Level := L; - end loop; - - Self_ID.Common.State := Runnable; - Self_ID.Awake_Count := 1; - - -- Since this is not an ordinary Ada task, we will start out undeferred - - Self_ID.Deferral_Level := 0; - - System.Soft_Links.Create_TSD (Self_ID.Common.Compiler_Data); - - -- ???? - -- The following call is commented out to avoid dependence on - -- the System.Tasking.Initialization package. - -- It seems that if we want Ada.Task_Attributes to work correctly - -- for C threads we will need to raise the visibility of this soft - -- link to System.Soft_Links. - -- We are putting that off until this new functionality is otherwise - -- stable. - -- System.Tasking.Initialization.Initialize_Attributes_Link.all (T); - - for J in Known_Tasks'Range loop - if Known_Tasks (J) = null then - Known_Tasks (J) := Self_ID; - Self_ID.Known_Tasks_Index := J; - exit; - end if; - end loop; - - -- Must not unlock until Next_ATCB is again allocated. - - Unlock (All_Tasks_L'Access); - return Self_ID; - end New_Fake_ATCB; - - ---------------- - -- Initialize -- - ---------------- - - procedure Initialize (Environment_Task : Task_ID) is - Result : Interfaces.C.int; - - begin - Result := pthread_key_create (ATCB_Key'Access, null); - pragma Assert (Result = 0); - Result := pthread_setspecific (ATCB_Key, To_Address (Environment_Task)); - pragma Assert (Result = 0); - - -- Create a free ATCB for use on the Fake_ATCB_List. - - Next_Fake_ATCB := new Fake_ATCB; - end Initialize; - - --------- - -- Set -- - --------- - - procedure Set (Self_Id : Task_ID) is - Result : Interfaces.C.int; - - begin - Result := pthread_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. - - -- (The entire Ada run-time system may not have been elaborated, - -- either, but that is a different problem, that we will need to - -- solve another way.) - - -- 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. - - -- We will also use such points to poll for disappearance of the - -- threads associated with any implicit ATCBs that we created - -- earlier, and take the opportunity to recover them. - - -- A nasty problem here is the limitations of the compilation - -- order dependency, and in particular the GNARL/GNULLI layering. - -- To initialize an ATCB we need to assume System.Tasking has - -- been elaborated. - - function Self return Task_ID is - Result : System.Address; - - begin - Result := pthread_getspecific (ATCB_Key); - - -- If the key value is Null, then it is a non-Ada task. - - if Result = System.Null_Address then - return New_Fake_ATCB; - end if; - - return To_Task_ID (Result); - end Self; - -end Specific;