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Diffstat (limited to 'gcc-4.2.1/gcc/ada/s-tassta.ads')
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diff --git a/gcc-4.2.1/gcc/ada/s-tassta.ads b/gcc-4.2.1/gcc/ada/s-tassta.ads deleted file mode 100644 index 6fc8c8ccc..000000000 --- a/gcc-4.2.1/gcc/ada/s-tassta.ads +++ /dev/null @@ -1,276 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- --- -- --- S Y S T E M . T A S K I N G . S T A G E S -- --- -- --- S p e c -- --- -- --- Copyright (C) 1992-2005, 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 package represents the high level tasking interface used by the --- compiler to expand Ada 95 tasking constructs into simpler run time calls --- (aka GNARLI, GNU Ada Run-time Library Interface) - --- Note: Only the compiler is allowed to use this interface, by generating --- direct calls to it, via Rtsfind. --- Any changes to this interface may require corresponding compiler changes --- in exp_ch9.adb and possibly exp_ch7.adb - -with System.Task_Info; --- used for Task_Info_Type - -with System.Parameters; --- used for Size_Type - -package System.Tasking.Stages is - pragma Elaborate_Body; - - -- The compiler will expand in the GNAT tree the following construct: - - -- task type T (Discr : Integer); - - -- task body T is - -- ...declarations, possibly some controlled... - -- begin - -- ...B...; - -- end T; - - -- T1 : T (1); - - -- as follows: - - -- enter_master.all; - - -- _chain : aliased activation_chain; - -- activation_chainIP (_chain); - - -- task type t (discr : integer); - -- tE : aliased boolean := false; - -- tZ : size_type := unspecified_size; - -- type tV (discr : integer) is limited record - -- _task_id : task_id; - -- end record; - -- procedure tB (_task : access tV); - -- freeze tV [ - -- procedure tVIP (_init : in out tV; _master : master_id; - -- _chain : in out activation_chain; _task_id : in task_image_type; - -- discr : integer) is - -- begin - -- _init.discr := discr; - -- _init._task_id := null; - -- create_task (unspecified_priority, tZ, - -- unspecified_task_info, 0, _master, - -- task_procedure_access!(tB'address), - -- _init'address, tE'unchecked_access, _chain, _task_id, _init. - -- _task_id); - -- return; - -- end tVIP; - -- ] - - -- procedure tB (_task : access tV) is - -- discr : integer renames _task.discr; - - -- procedure _clean is - -- begin - -- abort_defer.all; - -- complete_task; - -- finalize_list (F14b); - -- abort_undefer.all; - -- return; - -- end _clean; - -- begin - -- abort_undefer.all; - -- ...declarations... - -- complete_activation; - -- ...B...; - -- return; - -- at end - -- _clean; - -- end tB; - - -- tE := true; - -- t1 : t (1); - -- _master : constant master_id := current_master.all; - -- t1S : task_image_type := new string'"t1"; - -- task_image_typeIP (t1, _master, _chain, t1S, 1); - - -- activate_tasks (_chain'unchecked_access); - - procedure Abort_Tasks (Tasks : Task_List); - -- Compiler interface only. Do not call from within the RTS. Initiate - -- abort, however, the actual abort is done by abortee by means of - -- Abort_Handler and Abort_Undefer - -- - -- source code: - -- Abort T1, T2; - -- code expansion: - -- abort_tasks (task_list'(t1._task_id, t2._task_id)); - - procedure Activate_Tasks (Chain_Access : Activation_Chain_Access); - -- Compiler interface only. Do not call from within the RTS. - -- This must be called by the creator of a chain of one or more new tasks, - -- to activate them. The chain is a linked list that up to this point is - -- only known to the task that created them, though the individual tasks - -- are already in the All_Tasks_List. - -- - -- The compiler builds the chain in LIFO order (as a stack). Another - -- version of this procedure had code to reverse the chain, so as to - -- activate the tasks in the order of declaration. This might be nice, but - -- it is not needed if priority-based scheduling is supported, since all - -- the activated tasks synchronize on the activators lock before they - -- start activating and so they should start activating in priority order. - - procedure Complete_Activation; - -- Compiler interface only. Do not call from within the RTS. - -- This should be called from the task body at the end of - -- the elaboration code for its declarative part. - -- Decrement the count of tasks to be activated by the activator and - -- wake it up so it can check to see if all tasks have been activated. - -- Except for the environment task, which should never call this procedure, - -- T.Activator should only be null iff T has completed activation. - - procedure Complete_Master; - -- Compiler interface only. Do not call from within the RTS. This must - -- be called on exit from any master where Enter_Master was called. - -- Assume abort is deferred at this point. - - procedure Complete_Task; - -- Compiler interface only. Do not call from within the RTS. - -- This should be called from an implicit at-end handler - -- associated with the task body, when it completes. - -- From this point, the current task will become not callable. - -- If the current task have not completed activation, this should be done - -- now in order to wake up the activator (the environment task). - - procedure Create_Task - (Priority : Integer; - Size : System.Parameters.Size_Type; - Task_Info : System.Task_Info.Task_Info_Type; - Num_Entries : Task_Entry_Index; - Master : Master_Level; - State : Task_Procedure_Access; - Discriminants : System.Address; - Elaborated : Access_Boolean; - Chain : in out Activation_Chain; - Task_Image : String; - Created_Task : out Task_Id); - -- Compiler interface only. Do not call from within the RTS. - -- This must be called to create a new task. - -- - -- Priority is the task's priority (assumed to be in the - -- System.Any_Priority'Range) - -- Size is the stack size of the task to create - -- Task_Info is the task info associated with the created task, or - -- Unspecified_Task_Info if none. - -- State is the compiler generated task's procedure body - -- Discriminants is a pointer to a limited record whose discriminants - -- are those of the task to create. This parameter should be passed as - -- the single argument to State. - -- Elaborated is a pointer to a Boolean that must be set to true on exit - -- if the task could be sucessfully elaborated. - -- Chain is a linked list of task that needs to be created. On exit, - -- Created_Task.Activation_Link will be Chain.T_ID, and Chain.T_ID - -- will be Created_Task (e.g the created task will be linked at the front - -- of Chain). - -- Task_Image is a string created by the compiler that the - -- run time can store to ease the debugging and the - -- Ada.Task_Identification facility. - -- Created_Task is the resulting task. - -- - -- This procedure can raise Storage_Error if the task creation failed. - - function Current_Master return Master_Level; - -- Compiler interface only. - -- This is called to obtain the current master nesting level. - - procedure Enter_Master; - -- Compiler interface only. Do not call from within the RTS. - -- This must be called on entry to any "master" where a task, - -- or access type designating objects containing tasks, may be - -- declared. - - procedure Expunge_Unactivated_Tasks (Chain : in out Activation_Chain); - -- Compiler interface only. Do not call from within the RTS. - -- This must be called by the compiler-generated code for an allocator if - -- the allocated object contains tasks, if the allocator exits without - -- calling Activate_Tasks for a given activation chains, as can happen if - -- an exception occurs during initialization of the object. - -- - -- This should be called ONLY for tasks created via an allocator. Recovery - -- of storage for unactivated local task declarations is done by - -- Complete_Master and Complete_Task. - -- - -- We remove each task from Chain and All_Tasks_List before we free the - -- storage of its ATCB. - -- - -- In other places where we recover the storage of unactivated tasks, we - -- need to clean out the entry queues, but here that should not be - -- necessary, since these tasks should not have been visible to any other - -- tasks, and so no task should be able to queue a call on their entries. - -- - -- Just in case somebody misuses this subprogram, there is a check to - -- verify this condition. - - procedure Finalize_Global_Tasks; - -- This should be called to complete the execution of the environment task - -- and shut down the tasking runtime system. It is the equivalent of - -- Complete_Task, but for the environment task. - -- - -- The environment task must first call Complete_Master, to wait for user - -- tasks that depend on library-level packages to terminate. It then calls - -- Abort_Dependents to abort the "independent" library-level server tasks - -- that are created implicitly by the RTS packages (signal and timer server - -- tasks), and then waits for them to terminate. Then, it calls - -- Vulnerable_Complete_Task. - -- - -- It currently also executes the global finalization list, and then resets - -- the "soft links". - - procedure Free_Task (T : Task_Id); - -- Recover all runtime system storage associated with the task T, but only - -- if T has terminated. Do nothing in the other case. It is called from - -- Unchecked_Deallocation, for objects that are or contain tasks. - - function Terminated (T : Task_Id) return Boolean; - -- This is called by the compiler to implement the 'Terminated attribute. - -- Though is not required to be so by the ARM, we choose to synchronize - -- with the task's ATCB, so that this is more useful for polling the state - -- of a task, and so that it becomes an abort completion point for the - -- calling task (via Undefer_Abort). - -- - -- source code: - -- T1'Terminated - -- - -- code expansion: - -- terminated (t1._task_id) - - procedure Terminate_Task (Self_ID : Task_Id); - -- Terminate the calling task. - -- This should only be called by the Task_Wrapper procedure, and to - -- deallocate storage associate with foreign tasks. - -end System.Tasking.Stages; |