------------------------------------------------------------------------------
-- --
--- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
+-- 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 . O P E R A T I O N S --
-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2004, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2007, 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- --
-- 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. --
+-- 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, --
with System.Tasking.Debug;
-- used for Known_Tasks
-with System.IO;
--- used for Put_Line
-
with System.Interrupt_Management;
-- used for Keep_Unmasked
-- Abort_Task_Interrupt
-- Interrupt_ID
-with System.Interrupt_Management.Operations;
--- used for Set_Interrupt_Mask
--- All_Tasks_Mask
-pragma Elaborate_All (System.Interrupt_Management.Operations);
-
-with System.Parameters;
--- used for Size_Type
+with System.OS_Primitives;
+-- used for Delay_Modes
-with System.Tasking;
--- used for Ada_Task_Control_Block
--- Task_Id
+with System.IO;
+-- used for Put_Line
with System.Soft_Links;
--- used for Defer/Undefer_Abort
+-- used for Abort_Defer/Undefer
--- Note that we do not use System.Tasking.Initialization directly since
--- this is a higher level package that we shouldn't depend on. For example
--- when using the restricted run time, it is replaced by
--- System.Tasking.Restricted.Initialization
+-- We use System.Soft_Links instead of System.Tasking.Initialization
+-- because the later is a higher level package that we shouldn't depend on.
+-- For example when using the restricted run time, it is replaced by
+-- System.Tasking.Restricted.Stages.
-with System.Program_Info;
--- used for Default_Task_Stack
--- Default_Time_Slice
--- Stack_Guard_Pages
--- Pthread_Sched_Signal
--- Pthread_Arena_Size
-
-with System.OS_Interface;
--- used for various type, constant, and operations
-
-with System.OS_Primitives;
--- used for Delay_Modes
-
-with Unchecked_Conversion;
-with Unchecked_Deallocation;
+with Ada.Unchecked_Conversion;
+with Ada.Unchecked_Deallocation;
package body System.Task_Primitives.Operations is
+ package SSL renames System.Soft_Links;
+
use System.Tasking;
use System.Tasking.Debug;
use Interfaces.C;
use System.OS_Primitives;
use System.Parameters;
- package SSL renames System.Soft_Links;
-
- ------------------
- -- Local Data --
- ------------------
+ ----------------
+ -- Local Data --
+ ----------------
-- The followings are logically constants, but need to be initialized
-- at run time.
-- Key used to find the Ada Task_Id associated with a thread
Environment_Task_Id : Task_Id;
- -- A variable to hold Task_Id for the environment task.
+ -- A variable to hold Task_Id for the environment task
Locking_Policy : Character;
pragma Import (C, Locking_Policy, "__gl_locking_policy");
+ Time_Slice_Val : Integer;
+ pragma Import (C, Time_Slice_Val, "__gl_time_slice_val");
+
+ Dispatching_Policy : Character;
+ pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy");
+
Real_Time_Clock_Id : constant clockid_t := CLOCK_REALTIME;
Unblocked_Signal_Mask : aliased sigset_t;
Foreign_Task_Elaborated : aliased Boolean := True;
- -- Used to identified fake tasks (i.e., non-Ada Threads).
+ -- Used to identified fake tasks (i.e., non-Ada Threads)
--------------------
-- Local Packages --
procedure Initialize (Environment_Task : Task_Id);
pragma Inline (Initialize);
- -- Initialize various data needed by this package.
+ -- Initialize various data needed by this package
function Is_Valid_Task return Boolean;
pragma Inline (Is_Valid_Task);
procedure Set (Self_Id : Task_Id);
pragma Inline (Set);
- -- Set the self id for the current task.
+ -- Set the self id for the current task
function Self return Task_Id;
pragma Inline (Self);
- -- Return a pointer to the Ada Task Control Block of the calling task.
+ -- Return a pointer to the Ada Task Control Block of the calling task
end Specific;
package body Specific is separate;
- -- The body of this package is target specific.
+ -- The body of this package is target specific
---------------------------------
-- Support for foreign threads --
---------------------------------
function Register_Foreign_Thread (Thread : Thread_Id) return Task_Id;
- -- Allocate and Initialize a new ATCB for the current Thread.
+ -- Allocate and Initialize a new ATCB for the current Thread
function Register_Foreign_Thread
(Thread : Thread_Id) return Task_Id is separate;
-- Local Subprograms --
-----------------------
- function To_Address is new Unchecked_Conversion (Task_Id, System.Address);
+ function To_Address is
+ new Ada.Unchecked_Conversion (Task_Id, System.Address);
procedure Abort_Handler (Sig : Signal);
- -- Signal handler used to implement asynchronous abort.
+ -- Signal handler used to implement asynchronous abort
-------------------
-- Abort_Handler --
-- Initialize_Lock --
---------------------
- -- Note: mutexes and cond_variables needed per-task basis are
- -- initialized in Initialize_TCB and the Storage_Error is
- -- handled. Other mutexes (such as RTS_Lock, Memory_Lock...)
- -- used in RTS is initialized before any status change of RTS.
- -- Therefore rasing Storage_Error in the following routines
- -- should be able to be handled safely.
+ -- Note: mutexes and cond_variables needed per-task basis are initialized
+ -- in Initialize_TCB and the Storage_Error is handled. Other mutexes (such
+ -- as RTS_Lock, Memory_Lock...) used in RTS is initialized before any
+ -- status change of RTS. Therefore rasing Storage_Error in the following
+ -- routines should be able to be handled safely.
procedure Initialize_Lock
(Prio : System.Any_Priority;
- L : access Lock)
+ L : not null access Lock)
is
Attributes : aliased pthread_mutexattr_t;
Result : Interfaces.C.int;
end if;
if Locking_Policy = 'C' then
- Result := pthread_mutexattr_setprotocol
- (Attributes'Access, PTHREAD_PRIO_PROTECT);
+ Result :=
+ pthread_mutexattr_setprotocol
+ (Attributes'Access, PTHREAD_PRIO_PROTECT);
pragma Assert (Result = 0);
- Result := pthread_mutexattr_setprioceiling
- (Attributes'Access, Interfaces.C.int (Prio));
+ Result :=
+ pthread_mutexattr_setprioceiling
+ (Attributes'Access, Interfaces.C.int (Prio));
pragma Assert (Result = 0);
end if;
pragma Assert (Result = 0);
end Initialize_Lock;
- procedure Initialize_Lock (L : access RTS_Lock; Level : Lock_Level) is
+ procedure Initialize_Lock
+ (L : not null access RTS_Lock;
+ Level : Lock_Level)
+ is
pragma Unreferenced (Level);
Attributes : aliased pthread_mutexattr_t;
end if;
Result := pthread_mutexattr_destroy (Attributes'Access);
+ pragma Assert (Result = 0);
end Initialize_Lock;
-------------------
-- Finalize_Lock --
-------------------
- procedure Finalize_Lock (L : access Lock) is
+ procedure Finalize_Lock (L : not null access Lock) is
Result : Interfaces.C.int;
begin
Result := pthread_mutex_destroy (L);
pragma Assert (Result = 0);
end Finalize_Lock;
- procedure Finalize_Lock (L : access RTS_Lock) is
+ procedure Finalize_Lock (L : not null access RTS_Lock) is
Result : Interfaces.C.int;
begin
Result := pthread_mutex_destroy (L);
-- Write_Lock --
----------------
- procedure Write_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
+ procedure Write_Lock
+ (L : not null access Lock; Ceiling_Violation : out Boolean)
+ is
Result : Interfaces.C.int;
+
begin
Result := pthread_mutex_lock (L);
Ceiling_Violation := Result = EINVAL;
end Write_Lock;
procedure Write_Lock
- (L : access RTS_Lock;
+ (L : not null access RTS_Lock;
Global_Lock : Boolean := False)
is
Result : Interfaces.C.int;
-- Read_Lock --
---------------
- procedure Read_Lock (L : access Lock; Ceiling_Violation : out Boolean) is
+ procedure Read_Lock
+ (L : not null access Lock; Ceiling_Violation : out Boolean) is
begin
Write_Lock (L, Ceiling_Violation);
end Read_Lock;
-- Unlock --
------------
- procedure Unlock (L : access Lock) is
+ procedure Unlock (L : not null access Lock) is
Result : Interfaces.C.int;
begin
Result := pthread_mutex_unlock (L);
pragma Assert (Result = 0);
end Unlock;
- procedure Unlock (L : access RTS_Lock; Global_Lock : Boolean := False) is
+ procedure Unlock
+ (L : not null access RTS_Lock;
+ Global_Lock : Boolean := False)
+ is
Result : Interfaces.C.int;
-
begin
if not Single_Lock or else Global_Lock then
Result := pthread_mutex_unlock (L);
procedure Unlock (T : Task_Id) is
Result : Interfaces.C.int;
-
begin
if not Single_Lock then
Result := pthread_mutex_unlock (T.Common.LL.L'Access);
end if;
end Unlock;
+ -----------------
+ -- Set_Ceiling --
+ -----------------
+
+ -- Dynamic priority ceilings are not supported by the underlying system
+
+ procedure Set_Ceiling
+ (L : not null access Lock;
+ Prio : System.Any_Priority)
+ is
+ pragma Unreferenced (L, Prio);
+ begin
+ null;
+ end Set_Ceiling;
+
-----------
-- Sleep --
-----------
Reason : System.Tasking.Task_States)
is
pragma Unreferenced (Reason);
-
Result : Interfaces.C.int;
begin
if Single_Lock then
- Result := pthread_cond_wait
- (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
+ Result :=
+ pthread_cond_wait
+ (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
else
- Result := pthread_cond_wait
- (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
+ Result :=
+ pthread_cond_wait
+ (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
end if;
- -- EINTR is not considered a failure.
+ -- EINTR is not considered a failure
pragma Assert (Result = 0 or else Result = EINTR);
end Sleep;
is
pragma Unreferenced (Reason);
- Check_Time : constant Duration := Monotonic_Clock;
+ Base_Time : constant Duration := Monotonic_Clock;
+ Check_Time : Duration := Base_Time;
Abs_Time : Duration;
Request : aliased timespec;
Result : Interfaces.C.int;
Request := To_Timespec (Abs_Time);
loop
- exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
- or else Self_ID.Pending_Priority_Change;
+ exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
if Single_Lock then
- Result := pthread_cond_timedwait
- (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access,
- Request'Access);
+ Result :=
+ pthread_cond_timedwait
+ (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access,
+ Request'Access);
else
- Result := pthread_cond_timedwait
- (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access,
- Request'Access);
+ Result :=
+ pthread_cond_timedwait
+ (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access,
+ Request'Access);
end if;
- exit when Abs_Time <= Monotonic_Clock;
+ Check_Time := Monotonic_Clock;
+ exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
if Result = 0 or else errno = EINTR then
Timedout := False;
-- Timed_Delay --
-----------------
- -- This is for use in implementing delay statements, so
- -- we assume the caller is abort-deferred but is holding
- -- no locks.
+ -- This is for use in implementing delay statements, so we assume
+ -- the caller is abort-deferred but is holding no locks.
procedure Timed_Delay
(Self_ID : Task_Id;
Time : Duration;
Mode : ST.Delay_Modes)
is
- Check_Time : constant Duration := Monotonic_Clock;
+ Base_Time : constant Duration := Monotonic_Clock;
+ Check_Time : Duration := Base_Time;
Abs_Time : Duration;
Request : aliased timespec;
Result : Interfaces.C.int;
begin
- -- Only the little window between deferring abort and
- -- locking Self_ID is the reason we need to
- -- check for pending abort and priority change below! :(
-
- SSL.Abort_Defer.all;
-
if Single_Lock then
Lock_RTS;
end if;
Self_ID.Common.State := Delay_Sleep;
loop
- if Self_ID.Pending_Priority_Change then
- Self_ID.Pending_Priority_Change := False;
- Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority;
- Set_Priority (Self_ID, Self_ID.Common.Base_Priority);
- end if;
-
exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level;
- Result := pthread_cond_timedwait (Self_ID.Common.LL.CV'Access,
- Self_ID.Common.LL.L'Access, Request'Access);
- exit when Abs_Time <= Monotonic_Clock;
+ if Single_Lock then
+ Result := pthread_cond_timedwait
+ (Self_ID.Common.LL.CV'Access,
+ Single_RTS_Lock'Access,
+ Request'Access);
+ else
+ Result := pthread_cond_timedwait
+ (Self_ID.Common.LL.CV'Access,
+ Self_ID.Common.LL.L'Access,
+ Request'Access);
+ end if;
+
+ Check_Time := Monotonic_Clock;
+ exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
pragma Assert (Result = 0
or else Result = ETIMEDOUT
end if;
Yield;
- SSL.Abort_Undefer.all;
end Timed_Delay;
---------------------
-- resolution of reading the clock. Even though this last value is
-- only guaranteed to be 100 Hz, at least the Origin 200 appears to
-- have a microsecond resolution or better.
+
-- ??? We should figure out a method to return the right value on
-- all SGI hardware.
- return 0.000_001; -- Assume microsecond resolution of clock
+ return 0.000_001;
end RT_Resolution;
------------
use type System.Task_Info.Task_Info_Type;
- function To_Int is new Unchecked_Conversion
+ function To_Int is new Ada.Unchecked_Conversion
(System.Task_Info.Thread_Scheduling_Policy, Interfaces.C.int);
+ function Get_Policy (Prio : System.Any_Priority) return Character;
+ pragma Import (C, Get_Policy, "__gnat_get_specific_dispatching");
+ -- Get priority specific dispatching policy
+
+ Priority_Specific_Policy : constant Character := Get_Policy (Prio);
+ -- Upper case first character of the policy name corresponding to the
+ -- task as set by a Priority_Specific_Dispatching pragma.
+
begin
T.Common.Current_Priority := Prio;
Param.sched_priority := Interfaces.C.int (Prio);
if T.Common.Task_Info /= null then
Sched_Policy := To_Int (T.Common.Task_Info.Policy);
+
+ elsif Dispatching_Policy = 'R'
+ or else Priority_Specific_Policy = 'R'
+ or else Time_Slice_Val > 0
+ then
+ Sched_Policy := SCHED_RR;
+
else
Sched_Policy := SCHED_FIFO;
end if;
procedure Enter_Task (Self_ID : Task_Id) is
Result : Interfaces.C.int;
- function To_Int is new Unchecked_Conversion
+ function To_Int is new Ada.Unchecked_Conversion
(System.Task_Info.CPU_Number, Interfaces.C.int);
use System.Task_Info;
pragma Assert (Result = 0 or else Result = ENOMEM);
if Result = 0 then
- Result := pthread_cond_init (Self_ID.Common.LL.CV'Access,
- Cond_Attr'Access);
+ Result :=
+ pthread_cond_init (Self_ID.Common.LL.CV'Access, Cond_Attr'Access);
pragma Assert (Result = 0 or else Result = ENOMEM);
end if;
is
use System.Task_Info;
- Attributes : aliased pthread_attr_t;
- Sched_Param : aliased struct_sched_param;
- Adjusted_Stack_Size : Interfaces.C.size_t;
- Result : Interfaces.C.int;
+ Attributes : aliased pthread_attr_t;
+ Sched_Param : aliased struct_sched_param;
+ Result : Interfaces.C.int;
function Thread_Body_Access is new
- Unchecked_Conversion (System.Address, Thread_Body);
-
- function To_Int is new Unchecked_Conversion
+ Ada.Unchecked_Conversion (System.Address, Thread_Body);
+ function To_Int is new Ada.Unchecked_Conversion
(System.Task_Info.Thread_Scheduling_Scope, Interfaces.C.int);
- function To_Int is new Unchecked_Conversion
+ function To_Int is new Ada.Unchecked_Conversion
(System.Task_Info.Thread_Scheduling_Inheritance, Interfaces.C.int);
- function To_Int is new Unchecked_Conversion
+ function To_Int is new Ada.Unchecked_Conversion
(System.Task_Info.Thread_Scheduling_Policy, Interfaces.C.int);
begin
- if Stack_Size = System.Parameters.Unspecified_Size then
- Adjusted_Stack_Size :=
- Interfaces.C.size_t (System.Program_Info.Default_Task_Stack);
-
- elsif Stack_Size < Size_Type (Minimum_Stack_Size) then
- Adjusted_Stack_Size :=
- Interfaces.C.size_t (Minimum_Stack_Size);
-
- else
- Adjusted_Stack_Size := Interfaces.C.size_t (Stack_Size);
- end if;
-
Result := pthread_attr_init (Attributes'Access);
pragma Assert (Result = 0 or else Result = ENOMEM);
return;
end if;
- Result := pthread_attr_setdetachstate
- (Attributes'Access, PTHREAD_CREATE_DETACHED);
+ Result :=
+ pthread_attr_setdetachstate
+ (Attributes'Access, PTHREAD_CREATE_DETACHED);
pragma Assert (Result = 0);
- Result := pthread_attr_setstacksize
- (Attributes'Access, Adjusted_Stack_Size);
+ Result :=
+ pthread_attr_setstacksize
+ (Attributes'Access, Interfaces.C.size_t (Stack_Size));
pragma Assert (Result = 0);
if T.Common.Task_Info /= null then
- Result := pthread_attr_setscope
- (Attributes'Access, To_Int (T.Common.Task_Info.Scope));
+ Result :=
+ pthread_attr_setscope
+ (Attributes'Access, To_Int (T.Common.Task_Info.Scope));
pragma Assert (Result = 0);
- Result := pthread_attr_setinheritsched
- (Attributes'Access, To_Int (T.Common.Task_Info.Inheritance));
+ Result :=
+ pthread_attr_setinheritsched
+ (Attributes'Access, To_Int (T.Common.Task_Info.Inheritance));
pragma Assert (Result = 0);
- Result := pthread_attr_setschedpolicy
- (Attributes'Access, To_Int (T.Common.Task_Info.Policy));
+ Result :=
+ pthread_attr_setschedpolicy
+ (Attributes'Access, To_Int (T.Common.Task_Info.Policy));
pragma Assert (Result = 0);
Sched_Param.sched_priority :=
Interfaces.C.int (T.Common.Task_Info.Priority);
- Result := pthread_attr_setschedparam
- (Attributes'Access, Sched_Param'Access);
+ Result :=
+ pthread_attr_setschedparam
+ (Attributes'Access, Sched_Param'Access);
pragma Assert (Result = 0);
end if;
-- do not need to manipulate caller's signal mask at this point.
-- All tasks in RTS will have All_Tasks_Mask initially.
- Result := pthread_create
- (T.Common.LL.Thread'Access,
- Attributes'Access,
- Thread_Body_Access (Wrapper),
- To_Address (T));
+ Result :=
+ pthread_create
+ (T.Common.LL.Thread'Access,
+ Attributes'Access,
+ Thread_Body_Access (Wrapper),
+ To_Address (T));
if Result /= 0
and then T.Common.Task_Info /= null
and then T.Common.Task_Info.Scope = PTHREAD_SCOPE_SYSTEM
then
- -- The pthread_create call may have failed because we
- -- asked for a system scope pthread and none were
- -- available (probably because the program was not executed
- -- by the superuser). Let's try for a process scope pthread
- -- instead of raising Tasking_Error.
+ -- The pthread_create call may have failed because we asked for a
+ -- system scope pthread and none were available (probably because
+ -- the program was not executed by the superuser). Let's try for
+ -- a process scope pthread instead of raising Tasking_Error.
System.IO.Put_Line
("Request for PTHREAD_SCOPE_SYSTEM in Task_Info pragma for task");
System.IO.Put_Line ("Scope changed to PTHREAD_SCOPE_PROCESS");
T.Common.Task_Info.Scope := PTHREAD_SCOPE_PROCESS;
- Result := pthread_attr_setscope
- (Attributes'Access, To_Int (T.Common.Task_Info.Scope));
+ Result :=
+ pthread_attr_setscope
+ (Attributes'Access, To_Int (T.Common.Task_Info.Scope));
pragma Assert (Result = 0);
- Result := pthread_create
- (T.Common.LL.Thread'Access,
- Attributes'Access,
- Thread_Body_Access (Wrapper),
- To_Address (T));
+ Result :=
+ pthread_create
+ (T.Common.LL.Thread'Access,
+ Attributes'Access,
+ Thread_Body_Access (Wrapper),
+ To_Address (T));
end if;
pragma Assert (Result = 0 or else Result = EAGAIN);
Is_Self : constant Boolean := T = Self;
procedure Free is new
- Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
+ Ada.Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
begin
if not Single_Lock then
procedure Abort_Task (T : Task_Id) is
Result : Interfaces.C.int;
begin
- Result := pthread_kill (T.Common.LL.Thread,
- Signal (System.Interrupt_Management.Abort_Task_Interrupt));
+ Result :=
+ pthread_kill
+ (T.Common.LL.Thread,
+ Signal (System.Interrupt_Management.Abort_Task_Interrupt));
pragma Assert (Result = 0);
end Abort_Task;
----------------
+ -- Initialize --
+ ----------------
+
+ procedure Initialize (S : in out Suspension_Object) is
+ Mutex_Attr : aliased pthread_mutexattr_t;
+ Cond_Attr : aliased pthread_condattr_t;
+ Result : Interfaces.C.int;
+
+ begin
+ -- Initialize internal state (always to False (RM D.10(6))
+
+ S.State := False;
+ S.Waiting := False;
+
+ -- Initialize internal mutex
+
+ Result := pthread_mutexattr_init (Mutex_Attr'Access);
+ pragma Assert (Result = 0 or else Result = ENOMEM);
+
+ if Result = ENOMEM then
+ raise Storage_Error;
+ end if;
+
+ Result := pthread_mutex_init (S.L'Access, Mutex_Attr'Access);
+ pragma Assert (Result = 0 or else Result = ENOMEM);
+
+ if Result = ENOMEM then
+ Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
+ pragma Assert (Result = 0);
+
+ raise Storage_Error;
+ end if;
+
+ Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
+ pragma Assert (Result = 0);
+
+ -- Initialize internal condition variable
+
+ Result := pthread_condattr_init (Cond_Attr'Access);
+ pragma Assert (Result = 0 or else Result = ENOMEM);
+
+ if Result /= 0 then
+ Result := pthread_mutex_destroy (S.L'Access);
+ pragma Assert (Result = 0);
+
+ if Result = ENOMEM then
+ raise Storage_Error;
+ end if;
+ end if;
+
+ Result := pthread_cond_init (S.CV'Access, Cond_Attr'Access);
+ pragma Assert (Result = 0 or else Result = ENOMEM);
+
+ if Result /= 0 then
+ Result := pthread_mutex_destroy (S.L'Access);
+ pragma Assert (Result = 0);
+
+ if Result = ENOMEM then
+ Result := pthread_condattr_destroy (Cond_Attr'Access);
+ pragma Assert (Result = 0);
+ raise Storage_Error;
+ end if;
+ end if;
+
+ Result := pthread_condattr_destroy (Cond_Attr'Access);
+ pragma Assert (Result = 0);
+ end Initialize;
+
+ --------------
+ -- Finalize --
+ --------------
+
+ procedure Finalize (S : in out Suspension_Object) is
+ Result : Interfaces.C.int;
+
+ begin
+ -- Destroy internal mutex
+
+ Result := pthread_mutex_destroy (S.L'Access);
+ pragma Assert (Result = 0);
+
+ -- Destroy internal condition variable
+
+ Result := pthread_cond_destroy (S.CV'Access);
+ pragma Assert (Result = 0);
+ end Finalize;
+
+ -------------------
+ -- Current_State --
+ -------------------
+
+ function Current_State (S : Suspension_Object) return Boolean is
+ begin
+ -- We do not want to use lock on this read operation. State is marked
+ -- as Atomic so that we ensure that the value retrieved is correct.
+
+ return S.State;
+ end Current_State;
+
+ ---------------
+ -- Set_False --
+ ---------------
+
+ procedure Set_False (S : in out Suspension_Object) is
+ Result : Interfaces.C.int;
+
+ begin
+ SSL.Abort_Defer.all;
+
+ Result := pthread_mutex_lock (S.L'Access);
+ pragma Assert (Result = 0);
+
+ S.State := False;
+
+ Result := pthread_mutex_unlock (S.L'Access);
+ pragma Assert (Result = 0);
+
+ SSL.Abort_Undefer.all;
+ end Set_False;
+
+ --------------
+ -- Set_True --
+ --------------
+
+ procedure Set_True (S : in out Suspension_Object) is
+ Result : Interfaces.C.int;
+
+ begin
+ SSL.Abort_Defer.all;
+
+ Result := pthread_mutex_lock (S.L'Access);
+ pragma Assert (Result = 0);
+
+ -- If there is already a task waiting on this suspension object then
+ -- we resume it, leaving the state of the suspension object to False,
+ -- as it is specified in ARM D.10 par. 9. Otherwise, it just leaves
+ -- the state to True.
+
+ if S.Waiting then
+ S.Waiting := False;
+ S.State := False;
+
+ Result := pthread_cond_signal (S.CV'Access);
+ pragma Assert (Result = 0);
+
+ else
+ S.State := True;
+ end if;
+
+ Result := pthread_mutex_unlock (S.L'Access);
+ pragma Assert (Result = 0);
+
+ SSL.Abort_Undefer.all;
+ end Set_True;
+
+ ------------------------
+ -- Suspend_Until_True --
+ ------------------------
+
+ procedure Suspend_Until_True (S : in out Suspension_Object) is
+ Result : Interfaces.C.int;
+
+ begin
+ SSL.Abort_Defer.all;
+
+ Result := pthread_mutex_lock (S.L'Access);
+ pragma Assert (Result = 0);
+
+ if S.Waiting then
+
+ -- Program_Error must be raised upon calling Suspend_Until_True
+ -- if another task is already waiting on that suspension object
+ -- (RM D.10(10)).
+
+ Result := pthread_mutex_unlock (S.L'Access);
+ pragma Assert (Result = 0);
+
+ SSL.Abort_Undefer.all;
+
+ raise Program_Error;
+ else
+ -- Suspend the task if the state is False. Otherwise, the task
+ -- continues its execution, and the state of the suspension object
+ -- is set to False (ARM D.10 par. 9).
+
+ if S.State then
+ S.State := False;
+ else
+ S.Waiting := True;
+ Result := pthread_cond_wait (S.CV'Access, S.L'Access);
+ end if;
+
+ Result := pthread_mutex_unlock (S.L'Access);
+ pragma Assert (Result = 0);
+
+ SSL.Abort_Undefer.all;
+ end if;
+ end Suspend_Until_True;
+
+ ----------------
-- Check_Exit --
----------------
begin
Environment_Task_Id := Environment_Task;
- -- Initialize the lock used to synchronize chain of all ATCBs.
+ Interrupt_Management.Initialize;
+
+ -- Initialize the lock used to synchronize chain of all ATCBs
Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
Enter_Task (Environment_Task);
+ -- Prepare the set of signals that should unblocked in all tasks
+
+ Result := sigemptyset (Unblocked_Signal_Mask'Access);
+ pragma Assert (Result = 0);
+
+ for J in Interrupt_Management.Interrupt_ID loop
+ if System.Interrupt_Management.Keep_Unmasked (J) then
+ Result := sigaddset (Unblocked_Signal_Mask'Access, Signal (J));
+ pragma Assert (Result = 0);
+ end if;
+ end loop;
+
-- Install the abort-signal handler
- if State (System.Interrupt_Management.Abort_Task_Interrupt)
- /= Default
+ if State
+ (System.Interrupt_Management.Abort_Task_Interrupt) /= Default
then
act.sa_flags := 0;
act.sa_handler := Abort_Handler'Address;
act.sa_mask := Tmp_Set;
Result :=
- sigaction (
- Signal (System.Interrupt_Management.Abort_Task_Interrupt),
- act'Unchecked_Access,
- old_act'Unchecked_Access);
+ sigaction
+ (Signal (System.Interrupt_Management.Abort_Task_Interrupt),
+ act'Unchecked_Access,
+ old_act'Unchecked_Access);
pragma Assert (Result = 0);
end if;
end Initialize;
-begin
- declare
- Result : Interfaces.C.int;
-
- begin
- -- Mask Environment task for all signals. The original mask of the
- -- Environment task will be recovered by Interrupt_Server task
- -- during the elaboration of s-interr.adb.
-
- System.Interrupt_Management.Operations.Set_Interrupt_Mask
- (System.Interrupt_Management.Operations.All_Tasks_Mask'Access);
-
- -- Prepare the set of signals that should unblocked in all tasks
-
- Result := sigemptyset (Unblocked_Signal_Mask'Access);
- pragma Assert (Result = 0);
-
- for J in Interrupt_Management.Interrupt_ID loop
- if System.Interrupt_Management.Keep_Unmasked (J) then
- Result := sigaddset (Unblocked_Signal_Mask'Access, Signal (J));
- pragma Assert (Result = 0);
- end if;
- end loop;
-
- -- Pick the highest resolution Clock for Clock_Realtime
- -- ??? This code currently doesn't work (see c94007[ab] for example)
- --
- -- if syssgi (SGI_CYCLECNTR_SIZE) = 64 then
- -- Real_Time_Clock_Id := CLOCK_SGI_CYCLE;
- -- else
- -- Real_Time_Clock_Id := CLOCK_REALTIME;
- -- end if;
- end;
end System.Task_Primitives.Operations;
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