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Diffstat (limited to 'gcc-4.8.3/gcc/ada/s-tarest.ads')
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1 files changed, 261 insertions, 0 deletions
diff --git a/gcc-4.8.3/gcc/ada/s-tarest.ads b/gcc-4.8.3/gcc/ada/s-tarest.ads new file mode 100644 index 000000000..6313be626 --- /dev/null +++ b/gcc-4.8.3/gcc/ada/s-tarest.ads @@ -0,0 +1,261 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- +-- -- +-- S Y S T E M . T A S K I N G . R E S T R I C T E D . S T A G E S -- +-- -- +-- 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 -- +-- <http://www.gnu.org/licenses/>. -- +-- -- +-- GNARL was developed by the GNARL team at Florida State University. -- +-- Extensive contributions were provided by Ada Core Technologies, Inc. -- +-- -- +------------------------------------------------------------------------------ + +-- This is a simplified version of the System.Tasking.Stages package, +-- intended to be used in a restricted run time. + +-- 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: the compiler generates direct calls to this interface, via Rtsfind. +-- Any changes to this interface may require corresponding compiler changes +-- in exp_ch9.adb and possibly exp_ch7.adb + +-- The restricted GNARLI is also composed of System.Protected_Objects and +-- System.Protected_Objects.Single_Entry + +with System.Task_Info; +with System.Parameters; + +package System.Tasking.Restricted.Stages is + pragma Elaborate_Body; + + --------------------------------- + -- Compiler Interface (GNARLI) -- + --------------------------------- + + -- 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: + + -- 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; + -- _atcb : aliased system__tasking__ada_task_control_block (0); + -- end record; + + -- procedure tB (_task : access tV); + -- freeze tV [ + -- procedure tVIP (_init : in out tV; _master : master_id; + -- _chain : in out activation_chain; _task_name : in string; + -- discr : integer) is + -- begin + -- _init.discr := discr; + -- _init._task_id := null; + -- system__tasking__ada_task_control_blockIP (_init._atcb, 0); + -- _init._task_id := _init._atcb'unchecked_access; + -- create_restricted_task (unspecified_priority, tZ, + -- unspecified_task_info, unspecified_cpu, + -- task_procedure_access!(tB'address), _init'address, + -- tE'unchecked_access, _task_name, _init._task_id); + -- return; + -- end tVIP; + + -- _chain : aliased activation_chain; + -- activation_chainIP (_chain); + + -- procedure tB (_task : access tV) is + -- discr : integer renames _task.discr; + + -- procedure _clean is + -- begin + -- complete_restricted_task; + -- finalize_list (F14b); + -- return; + -- end _clean; + + -- begin + -- ...declarations... + -- complete_restricted_activation; + -- ...B...; + -- return; + -- at end + -- _clean; + -- end tB; + + -- tE := true; + -- t1 : t (1); + -- t1S : constant String := "t1"; + -- tIP (t1, 3, _chain, t1S, 1); + + Partition_Elaboration_Policy : Character := 'C'; + pragma Export (C, Partition_Elaboration_Policy, + "__gnat_partition_elaboration_policy"); + -- Partition elaboration policy. Value can be either 'C' for concurrent, + -- which is the default or 'S' for sequential. This value can be modified + -- by the binder generated code, before calling elaboration code. + + procedure Create_Restricted_Task + (Priority : Integer; + Stack_Address : System.Address; + Size : System.Parameters.Size_Type; + Task_Info : System.Task_Info.Task_Info_Type; + CPU : Integer; + State : Task_Procedure_Access; + Discriminants : System.Address; + Elaborated : Access_Boolean; + Chain : in out Activation_Chain; + Task_Image : String; + Created_Task : Task_Id); + -- Compiler interface only. Do not call from within the RTS. + -- This must be called to create a new task, when the partition + -- elaboration policy is not specified (or is concurrent). + -- + -- Priority is the task's priority (assumed to be in the + -- System.Any_Priority'Range) + -- + -- Stack_Address is the start address of the stack associated to the task, + -- in case it has been preallocated by the compiler; it is equal to + -- Null_Address when the stack needs to be allocated by the underlying + -- operating system. + -- + -- 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. + -- + -- CPU is the task affinity. We pass it as an Integer to avoid an explicit + -- dependency from System.Multiprocessors when not needed. Static range + -- checks are performed when analyzing the pragma, and dynamic ones are + -- performed before setting the affinity at run time. + -- + -- 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 successfully 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 (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 fails + + procedure Create_Restricted_Task_Sequential + (Priority : Integer; + Stack_Address : System.Address; + Size : System.Parameters.Size_Type; + Task_Info : System.Task_Info.Task_Info_Type; + CPU : Integer; + State : Task_Procedure_Access; + Discriminants : System.Address; + Elaborated : Access_Boolean; + Task_Image : String; + Created_Task : Task_Id); + -- Compiler interface only. Do not call from within the RTS. + -- This must be called to create a new task, when the sequential partition + -- elaboration policy is used. + -- + -- The parameters are the same as Create_Restricted_Task_Concurrent, + -- except there is no Chain parameter (for the activation chain), as there + -- is only one global activation chain, which is declared in the body of + -- this package. + + procedure Activate_Restricted_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. + -- + -- When the partition elaboration policy is sequential, this procedure + -- does nothing, tasks will be activated at end of elaboration. + + procedure Activate_All_Tasks_Sequential; + pragma Export (C, Activate_All_Tasks_Sequential, + "__gnat_activate_all_tasks"); + -- Binder interface only. Do not call from within the RTS. This must be + -- called an the end of the elaboration to activate all tasks, in order + -- to implement the sequential elaboration policy. + + procedure Complete_Restricted_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_Restricted_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). + + function Restricted_Terminated (T : Task_Id) return Boolean; + -- Compiler interface only. Do not call from within the RTS. This is called + -- by the compiler to implement the 'Terminated attribute. + -- + -- source code: + -- T1'Terminated + -- + -- code expansion: + -- restricted_terminated (t1._task_id) + + procedure Finalize_Global_Tasks; + -- This is needed to support the compiler interface. It will only be called + -- by the Environment task in the binder generated file (by adafinal). + -- Instead, it will cause the Environment to block forever, since none of + -- the dependent tasks are expected to terminate + +end System.Tasking.Restricted.Stages; |