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-------------------------------------------------------------------------------
--- --
--- 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) 1992-2009, 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 OpenVMS/Alpha version of this package
-
--- This package contains all the GNULL primitives that interface directly with
--- the underlying OS.
-
-pragma Polling (Off);
--- Turn off polling, we do not want ATC polling to take place during tasking
--- operations. It causes infinite loops and other problems.
-
-with Ada.Unchecked_Conversion;
-with Ada.Unchecked_Deallocation;
-
-with Interfaces.C;
-
-with System.Tasking.Debug;
-with System.OS_Primitives;
-with System.Soft_Links;
-with System.Aux_DEC;
-
-package body System.Task_Primitives.Operations is
-
- use System.Tasking.Debug;
- use System.Tasking;
- use Interfaces.C;
- use System.OS_Interface;
- use System.Parameters;
- use System.OS_Primitives;
- use type System.OS_Primitives.OS_Time;
-
- package SSL renames System.Soft_Links;
-
- ----------------
- -- Local Data --
- ----------------
-
- -- The followings are logically constants, but need to be initialized
- -- at run time.
-
- Single_RTS_Lock : aliased RTS_Lock;
- -- This is a lock to allow only one thread of control in the RTS at
- -- a time; it is used to execute in mutual exclusion from all other tasks.
- -- Used mainly in Single_Lock mode, but also to protect All_Tasks_List
-
- ATCB_Key : aliased pthread_key_t;
- -- 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
-
- 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");
-
- Foreign_Task_Elaborated : aliased Boolean := True;
- -- Used to identified fake tasks (i.e., non-Ada Threads)
-
- --------------------
- -- Local Packages --
- --------------------
-
- package Specific is
-
- procedure Initialize (Environment_Task : Task_Id);
- pragma Inline (Initialize);
- -- Initialize various data needed by this package
-
- function Is_Valid_Task return Boolean;
- pragma Inline (Is_Valid_Task);
- -- Does executing thread have a TCB?
-
- procedure Set (Self_Id : Task_Id);
- pragma Inline (Set);
- -- 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
-
- end Specific;
-
- package body Specific is separate;
- -- 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
-
- function Register_Foreign_Thread
- (Thread : Thread_Id) return Task_Id is separate;
-
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- function To_Task_Id is
- new Ada.Unchecked_Conversion
- (System.Task_Primitives.Task_Address, Task_Id);
-
- function To_Address is
- new Ada.Unchecked_Conversion
- (Task_Id, System.Task_Primitives.Task_Address);
-
- function Get_Exc_Stack_Addr return Address;
- -- Replace System.Soft_Links.Get_Exc_Stack_Addr_NT
-
- procedure Timer_Sleep_AST (ID : Address);
- pragma Convention (C, Timer_Sleep_AST);
- -- Signal the condition variable when AST fires
-
- procedure Timer_Sleep_AST (ID : Address) is
- Result : Interfaces.C.int;
- pragma Warnings (Off, Result);
- Self_ID : constant Task_Id := To_Task_Id (ID);
- begin
- Self_ID.Common.LL.AST_Pending := False;
- Result := pthread_cond_signal_int_np (Self_ID.Common.LL.CV'Access);
- pragma Assert (Result = 0);
- end Timer_Sleep_AST;
-
- -----------------
- -- Stack_Guard --
- -----------------
-
- -- The underlying thread system sets a guard page at the bottom of a thread
- -- stack, so nothing is needed.
- -- ??? Check the comment above
-
- procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is
- pragma Unreferenced (T);
- pragma Unreferenced (On);
- begin
- null;
- end Stack_Guard;
-
- --------------------
- -- Get_Thread_Id --
- --------------------
-
- function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is
- begin
- return T.Common.LL.Thread;
- end Get_Thread_Id;
-
- ----------
- -- Self --
- ----------
-
- function Self return Task_Id renames Specific.Self;
-
- ---------------------
- -- 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 raising Storage_Error in the following
- -- routines should be able to be handled safely.
-
- procedure Initialize_Lock
- (Prio : System.Any_Priority;
- L : not null access Lock)
- is
- Attributes : aliased pthread_mutexattr_t;
- Result : Interfaces.C.int;
-
- begin
- Result := pthread_mutexattr_init (Attributes'Access);
- pragma Assert (Result = 0 or else Result = ENOMEM);
-
- if Result = ENOMEM then
- raise Storage_Error;
- end if;
-
- L.Prio_Save := 0;
- L.Prio := Interfaces.C.int (Prio);
-
- Result := pthread_mutex_init (L.L'Access, Attributes'Access);
- pragma Assert (Result = 0 or else Result = ENOMEM);
-
- if Result = ENOMEM then
- raise Storage_Error;
- end if;
-
- Result := pthread_mutexattr_destroy (Attributes'Access);
- pragma Assert (Result = 0);
- end Initialize_Lock;
-
- procedure Initialize_Lock
- (L : not null access RTS_Lock;
- Level : Lock_Level)
- is
- pragma Unreferenced (Level);
-
- Attributes : aliased pthread_mutexattr_t;
- Result : Interfaces.C.int;
-
- begin
- Result := pthread_mutexattr_init (Attributes'Access);
- pragma Assert (Result = 0 or else Result = ENOMEM);
-
- if Result = ENOMEM then
- raise Storage_Error;
- end if;
-
--- Don't use, see comment in s-osinte.ads about ERRORCHECK mutexes???
--- Result := pthread_mutexattr_settype_np
--- (Attributes'Access, PTHREAD_MUTEX_ERRORCHECK_NP);
--- pragma Assert (Result = 0);
-
--- Result := pthread_mutexattr_setprotocol
--- (Attributes'Access, PTHREAD_PRIO_PROTECT);
--- pragma Assert (Result = 0);
-
--- Result := pthread_mutexattr_setprioceiling
--- (Attributes'Access, Interfaces.C.int (System.Any_Priority'Last));
--- pragma Assert (Result = 0);
-
- Result := pthread_mutex_init (L, Attributes'Access);
-
- pragma Assert (Result = 0 or else Result = ENOMEM);
-
- if Result = ENOMEM then
- raise Storage_Error;
- end if;
-
- Result := pthread_mutexattr_destroy (Attributes'Access);
- pragma Assert (Result = 0);
- end Initialize_Lock;
-
- -------------------
- -- Finalize_Lock --
- -------------------
-
- procedure Finalize_Lock (L : not null access Lock) is
- Result : Interfaces.C.int;
- begin
- Result := pthread_mutex_destroy (L.L'Access);
- pragma Assert (Result = 0);
- end Finalize_Lock;
-
- procedure Finalize_Lock (L : not null access RTS_Lock) is
- Result : Interfaces.C.int;
- begin
- Result := pthread_mutex_destroy (L);
- pragma Assert (Result = 0);
- end Finalize_Lock;
-
- ----------------
- -- Write_Lock --
- ----------------
-
- procedure Write_Lock
- (L : not null access Lock;
- Ceiling_Violation : out Boolean)
- is
- Self_ID : constant Task_Id := Self;
- All_Tasks_Link : constant Task_Id := Self.Common.All_Tasks_Link;
- Current_Prio : System.Any_Priority;
- Result : Interfaces.C.int;
-
- begin
- Current_Prio := Get_Priority (Self_ID);
-
- -- If there is no other tasks, no need to check priorities
-
- if All_Tasks_Link /= Null_Task
- and then L.Prio < Interfaces.C.int (Current_Prio)
- then
- Ceiling_Violation := True;
- return;
- end if;
-
- Result := pthread_mutex_lock (L.L'Access);
- pragma Assert (Result = 0);
-
- Ceiling_Violation := False;
--- Why is this commented out ???
--- L.Prio_Save := Interfaces.C.int (Current_Prio);
--- Set_Priority (Self_ID, System.Any_Priority (L.Prio));
- end Write_Lock;
-
- procedure Write_Lock
- (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_lock (L);
- pragma Assert (Result = 0);
- end if;
- end Write_Lock;
-
- procedure Write_Lock (T : Task_Id) is
- Result : Interfaces.C.int;
- begin
- if not Single_Lock then
- Result := pthread_mutex_lock (T.Common.LL.L'Access);
- pragma Assert (Result = 0);
- end if;
- end Write_Lock;
-
- ---------------
- -- Read_Lock --
- ---------------
-
- 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 : not null access Lock) is
- Result : Interfaces.C.int;
- begin
- Result := pthread_mutex_unlock (L.L'Access);
- pragma Assert (Result = 0);
- end Unlock;
-
- 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);
- pragma Assert (Result = 0);
- end if;
- end Unlock;
-
- 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);
- pragma Assert (Result = 0);
- 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 --
- -----------
-
- procedure Sleep
- (Self_ID : Task_Id;
- 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);
- else
- Result :=
- pthread_cond_wait
- (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
- end if;
-
- -- EINTR is not considered a failure
-
- pragma Assert (Result = 0 or else Result = EINTR);
-
- if Self_ID.Deferral_Level = 0
- and then Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level
- then
- Unlock (Self_ID);
- raise Standard'Abort_Signal;
- end if;
- end Sleep;
-
- -----------------
- -- Timed_Sleep --
- -----------------
-
- procedure Timed_Sleep
- (Self_ID : Task_Id;
- Time : Duration;
- Mode : ST.Delay_Modes;
- Reason : System.Tasking.Task_States;
- Timedout : out Boolean;
- Yielded : out Boolean)
- is
- pragma Unreferenced (Reason);
-
- Sleep_Time : OS_Time;
- Result : Interfaces.C.int;
- Status : Cond_Value_Type;
-
- -- The body below requires more comments ???
-
- begin
- Timedout := False;
- Yielded := False;
-
- Sleep_Time := To_OS_Time (Time, Mode);
-
- if Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level then
- return;
- end if;
-
- Self_ID.Common.LL.AST_Pending := True;
-
- Sys_Setimr
- (Status, 0, Sleep_Time,
- Timer_Sleep_AST'Access, To_Address (Self_ID), 0);
-
- if (Status and 1) /= 1 then
- raise Storage_Error;
- end if;
-
- if Single_Lock then
- Result :=
- pthread_cond_wait
- (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access);
- pragma Assert (Result = 0);
-
- else
- Result :=
- pthread_cond_wait
- (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access);
- pragma Assert (Result = 0);
- end if;
-
- Yielded := True;
-
- if not Self_ID.Common.LL.AST_Pending then
- Timedout := True;
- else
- Sys_Cantim (Status, To_Address (Self_ID), 0);
- pragma Assert ((Status and 1) = 1);
- end if;
- end Timed_Sleep;
-
- -----------------
- -- Timed_Delay --
- -----------------
-
- procedure Timed_Delay
- (Self_ID : Task_Id;
- Time : Duration;
- Mode : ST.Delay_Modes)
- is
- Sleep_Time : OS_Time;
- Result : Interfaces.C.int;
- Status : Cond_Value_Type;
- Yielded : Boolean := False;
-
- begin
- if Single_Lock then
- Lock_RTS;
- end if;
-
- -- More comments required in body below ???
-
- Write_Lock (Self_ID);
-
- if Time /= 0.0 or else Mode /= Relative then
- Sleep_Time := To_OS_Time (Time, Mode);
-
- if Mode = Relative or else OS_Clock <= Sleep_Time then
- Self_ID.Common.State := Delay_Sleep;
- Self_ID.Common.LL.AST_Pending := True;
-
- Sys_Setimr
- (Status, 0, Sleep_Time,
- Timer_Sleep_AST'Access, To_Address (Self_ID), 0);
-
- -- Comment following test
-
- if (Status and 1) /= 1 then
- raise Storage_Error;
- end if;
-
- loop
- if Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level then
- Sys_Cantim (Status, To_Address (Self_ID), 0);
- pragma Assert ((Status and 1) = 1);
- exit;
- end if;
-
- if Single_Lock then
- Result :=
- pthread_cond_wait
- (Self_ID.Common.LL.CV'Access,
- Single_RTS_Lock'Access);
- pragma Assert (Result = 0);
- else
- Result :=
- pthread_cond_wait
- (Self_ID.Common.LL.CV'Access,
- Self_ID.Common.LL.L'Access);
- pragma Assert (Result = 0);
- end if;
-
- Yielded := True;
-
- exit when not Self_ID.Common.LL.AST_Pending;
- end loop;
-
- Self_ID.Common.State := Runnable;
- end if;
- end if;
-
- Unlock (Self_ID);
-
- if Single_Lock then
- Unlock_RTS;
- end if;
-
- if not Yielded then
- Result := sched_yield;
- pragma Assert (Result = 0);
- end if;
- end Timed_Delay;
-
- ---------------------
- -- Monotonic_Clock --
- ---------------------
-
- function Monotonic_Clock return Duration
- renames System.OS_Primitives.Monotonic_Clock;
-
- -------------------
- -- RT_Resolution --
- -------------------
-
- function RT_Resolution return Duration is
- begin
- -- Document origin of this magic constant ???
- return 10#1.0#E-3;
- end RT_Resolution;
-
- ------------
- -- Wakeup --
- ------------
-
- procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is
- pragma Unreferenced (Reason);
- Result : Interfaces.C.int;
- begin
- Result := pthread_cond_signal (T.Common.LL.CV'Access);
- pragma Assert (Result = 0);
- end Wakeup;
-
- -----------
- -- Yield --
- -----------
-
- procedure Yield (Do_Yield : Boolean := True) is
- Result : Interfaces.C.int;
- pragma Unreferenced (Result);
- begin
- if Do_Yield then
- Result := sched_yield;
- end if;
- end Yield;
-
- ------------------
- -- Set_Priority --
- ------------------
-
- procedure Set_Priority
- (T : Task_Id;
- Prio : System.Any_Priority;
- Loss_Of_Inheritance : Boolean := False)
- is
- pragma Unreferenced (Loss_Of_Inheritance);
-
- Result : Interfaces.C.int;
- Param : aliased struct_sched_param;
-
- 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 (Underlying_Priorities (Prio));
-
- if Dispatching_Policy = 'R'
- or else Priority_Specific_Policy = 'R'
- or else Time_Slice_Val > 0
- then
- Result :=
- pthread_setschedparam
- (T.Common.LL.Thread, SCHED_RR, Param'Access);
-
- elsif Dispatching_Policy = 'F'
- or else Priority_Specific_Policy = 'F'
- or else Time_Slice_Val = 0
- then
- Result :=
- pthread_setschedparam
- (T.Common.LL.Thread, SCHED_FIFO, Param'Access);
-
- else
- -- SCHED_OTHER priorities are restricted to the range 8 - 15.
- -- Since the translation from Underlying priorities results
- -- in a range of 16 - 31, dividing by 2 gives the correct result.
-
- Param.sched_priority := Param.sched_priority / 2;
- Result :=
- pthread_setschedparam
- (T.Common.LL.Thread, SCHED_OTHER, Param'Access);
- end if;
-
- pragma Assert (Result = 0);
- end Set_Priority;
-
- ------------------
- -- Get_Priority --
- ------------------
-
- function Get_Priority (T : Task_Id) return System.Any_Priority is
- begin
- return T.Common.Current_Priority;
- end Get_Priority;
-
- ----------------
- -- Enter_Task --
- ----------------
-
- procedure Enter_Task (Self_ID : Task_Id) is
- begin
- Self_ID.Common.LL.Thread := pthread_self;
-
- Specific.Set (Self_ID);
-
- Lock_RTS;
-
- 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;
-
- Unlock_RTS;
- end Enter_Task;
-
- --------------
- -- New_ATCB --
- --------------
-
- function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is
- begin
- return new Ada_Task_Control_Block (Entry_Num);
- end New_ATCB;
-
- -------------------
- -- Is_Valid_Task --
- -------------------
-
- function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task;
-
- -----------------------------
- -- Register_Foreign_Thread --
- -----------------------------
-
- function Register_Foreign_Thread return Task_Id is
- begin
- if Is_Valid_Task then
- return Self;
- else
- return Register_Foreign_Thread (pthread_self);
- end if;
- end Register_Foreign_Thread;
-
- --------------------
- -- Initialize_TCB --
- --------------------
-
- procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is
- Mutex_Attr : aliased pthread_mutexattr_t;
- Result : Interfaces.C.int;
- Cond_Attr : aliased pthread_condattr_t;
-
- begin
- -- More comments required in body below ???
-
- if not Single_Lock then
- Result := pthread_mutexattr_init (Mutex_Attr'Access);
- pragma Assert (Result = 0 or else Result = ENOMEM);
-
- if Result = 0 then
- Result :=
- pthread_mutex_init
- (Self_ID.Common.LL.L'Access, Mutex_Attr'Access);
- pragma Assert (Result = 0 or else Result = ENOMEM);
- end if;
-
- if Result /= 0 then
- Succeeded := False;
- return;
- end if;
-
- Result := pthread_mutexattr_destroy (Mutex_Attr'Access);
- pragma Assert (Result = 0);
- end if;
-
- Result := pthread_condattr_init (Cond_Attr'Access);
- 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);
- pragma Assert (Result = 0 or else Result = ENOMEM);
- end if;
-
- if Result = 0 then
- Succeeded := True;
- Self_ID.Common.LL.Exc_Stack_Ptr := new Exc_Stack_T;
-
- else
- if not Single_Lock then
- Result := pthread_mutex_destroy (Self_ID.Common.LL.L'Access);
- pragma Assert (Result = 0);
- end if;
-
- Succeeded := False;
- end if;
-
- Result := pthread_condattr_destroy (Cond_Attr'Access);
- pragma Assert (Result = 0);
- end Initialize_TCB;
-
- ------------------------
- -- Get_Exc_Stack_Addr --
- ------------------------
-
- function Get_Exc_Stack_Addr return Address is
- begin
- return Self.Common.LL.Exc_Stack_Ptr (Exc_Stack_T'Last)'Address;
- end Get_Exc_Stack_Addr;
-
- -----------------
- -- Create_Task --
- -----------------
-
- procedure Create_Task
- (T : Task_Id;
- Wrapper : System.Address;
- Stack_Size : System.Parameters.Size_Type;
- Priority : System.Any_Priority;
- Succeeded : out Boolean)
- is
- Attributes : aliased pthread_attr_t;
- Result : Interfaces.C.int;
-
- function Thread_Body_Access is new
- Ada.Unchecked_Conversion (System.Aux_DEC.Short_Address, Thread_Body);
-
- begin
- -- Since the initial signal mask of a thread is inherited from the
- -- creator, we need to set our local signal mask to mask all signals
- -- during the creation operation, to make sure the new thread is
- -- not disturbed by signals before it has set its own Task_Id.
-
- Result := pthread_attr_init (Attributes'Access);
- pragma Assert (Result = 0 or else Result = ENOMEM);
-
- if Result /= 0 then
- Succeeded := False;
- return;
- end if;
-
- Result := pthread_attr_setdetachstate
- (Attributes'Access, PTHREAD_CREATE_DETACHED);
- pragma Assert (Result = 0);
-
- Result := pthread_attr_setstacksize
- (Attributes'Access, Interfaces.C.size_t (Stack_Size));
- pragma Assert (Result = 0);
-
- -- This call may be unnecessary, not sure. ???
-
- Result :=
- pthread_attr_setinheritsched
- (Attributes'Access, PTHREAD_EXPLICIT_SCHED);
- pragma Assert (Result = 0);
-
- Result :=
- pthread_create
- (T.Common.LL.Thread'Access,
- Attributes'Access,
- Thread_Body_Access (Wrapper),
- To_Address (T));
-
- -- ENOMEM is a valid run-time error -- do not shut down
-
- pragma Assert (Result = 0
- or else Result = EAGAIN or else Result = ENOMEM);
-
- Succeeded := Result = 0;
-
- Result := pthread_attr_destroy (Attributes'Access);
- pragma Assert (Result = 0);
-
- if Succeeded then
- Set_Priority (T, Priority);
- end if;
- end Create_Task;
-
- ------------------
- -- Finalize_TCB --
- ------------------
-
- procedure Finalize_TCB (T : Task_Id) is
- Result : Interfaces.C.int;
- Tmp : Task_Id := T;
- Is_Self : constant Boolean := T = Self;
-
- procedure Free is new
- Ada.Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id);
-
- procedure Free is new Ada.Unchecked_Deallocation
- (Exc_Stack_T, Exc_Stack_Ptr_T);
-
- begin
- if not Single_Lock then
- Result := pthread_mutex_destroy (T.Common.LL.L'Access);
- pragma Assert (Result = 0);
- end if;
-
- Result := pthread_cond_destroy (T.Common.LL.CV'Access);
- pragma Assert (Result = 0);
-
- if T.Known_Tasks_Index /= -1 then
- Known_Tasks (T.Known_Tasks_Index) := null;
- end if;
-
- Free (T.Common.LL.Exc_Stack_Ptr);
- Free (Tmp);
-
- if Is_Self then
- Specific.Set (null);
- end if;
- end Finalize_TCB;
-
- ---------------
- -- Exit_Task --
- ---------------
-
- procedure Exit_Task is
- begin
- null;
- end Exit_Task;
-
- ----------------
- -- Abort_Task --
- ----------------
-
- procedure Abort_Task (T : Task_Id) is
- begin
- -- Interrupt Server_Tasks may be waiting on an event flag
-
- if T.Common.State = Interrupt_Server_Blocked_On_Event_Flag then
- Wakeup (T, Interrupt_Server_Blocked_On_Event_Flag);
- end if;
- 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 (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 specified in (RM D.10(9)), otherwise leave state set 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 --
- ----------------
-
- -- Dummy version
-
- function Check_Exit (Self_ID : ST.Task_Id) return Boolean is
- pragma Unreferenced (Self_ID);
- begin
- return True;
- end Check_Exit;
-
- --------------------
- -- Check_No_Locks --
- --------------------
-
- function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is
- pragma Unreferenced (Self_ID);
- begin
- return True;
- end Check_No_Locks;
-
- ----------------------
- -- Environment_Task --
- ----------------------
-
- function Environment_Task return Task_Id is
- begin
- return Environment_Task_Id;
- end Environment_Task;
-
- --------------
- -- Lock_RTS --
- --------------
-
- procedure Lock_RTS is
- begin
- Write_Lock (Single_RTS_Lock'Access, Global_Lock => True);
- end Lock_RTS;
-
- ----------------
- -- Unlock_RTS --
- ----------------
-
- procedure Unlock_RTS is
- begin
- Unlock (Single_RTS_Lock'Access, Global_Lock => True);
- end Unlock_RTS;
-
- ------------------
- -- Suspend_Task --
- ------------------
-
- function Suspend_Task
- (T : ST.Task_Id;
- Thread_Self : Thread_Id) return Boolean
- is
- pragma Unreferenced (T);
- pragma Unreferenced (Thread_Self);
- begin
- return False;
- end Suspend_Task;
-
- -----------------
- -- Resume_Task --
- -----------------
-
- function Resume_Task
- (T : ST.Task_Id;
- Thread_Self : Thread_Id) return Boolean
- is
- pragma Unreferenced (T);
- pragma Unreferenced (Thread_Self);
- begin
- return False;
- end Resume_Task;
-
- --------------------
- -- Stop_All_Tasks --
- --------------------
-
- procedure Stop_All_Tasks is
- begin
- null;
- end Stop_All_Tasks;
-
- ---------------
- -- Stop_Task --
- ---------------
-
- function Stop_Task (T : ST.Task_Id) return Boolean is
- pragma Unreferenced (T);
- begin
- return False;
- end Stop_Task;
-
- -------------------
- -- Continue_Task --
- -------------------
-
- function Continue_Task (T : ST.Task_Id) return Boolean is
- pragma Unreferenced (T);
- begin
- return False;
- end Continue_Task;
-
- ----------------
- -- Initialize --
- ----------------
-
- procedure Initialize (Environment_Task : Task_Id) is
- begin
- Environment_Task_Id := Environment_Task;
-
- SSL.Get_Exc_Stack_Addr := Get_Exc_Stack_Addr'Access;
-
- -- Initialize the lock used to synchronize chain of all ATCBs
-
- Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level);
-
- Specific.Initialize (Environment_Task);
-
- Enter_Task (Environment_Task);
- end Initialize;
-
-end System.Task_Primitives.Operations;