------------------------------------------------------------------------------ -- -- -- 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) 1992-2012, 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 -- -- . -- -- -- -- 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 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 ---------------------------------- -- ATCB allocation/deallocation -- ---------------------------------- package body ATCB_Allocation is separate; -- The body of this package is shared across several targets --------------------------------- -- 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); 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 Result := pthread_cond_wait (cond => Self_ID.Common.LL.CV'Access, mutex => (if Single_Lock then Single_RTS_Lock'Access else Self_ID.Common.LL.L'Access)); -- 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; Result := pthread_cond_wait (cond => Self_ID.Common.LL.CV'Access, mutex => (if Single_Lock then Single_RTS_Lock'Access else Self_ID.Common.LL.L'Access)); pragma Assert (Result = 0); 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); end Enter_Task; ------------------- -- 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; 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; ----------------- -- 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); Task_Name : String (1 .. System.Parameters.Max_Task_Image_Length + 1); 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); if T.Common.Task_Image_Len > 0 then -- Set thread name to ease debugging Task_Name (1 .. T.Common.Task_Image_Len) := T.Common.Task_Image (1 .. T.Common.Task_Image_Len); Task_Name (T.Common.Task_Image_Len + 1) := ASCII.NUL; Result := pthread_attr_setname_np (Attributes'Access, Task_Name'Address, Null_Address); pragma Assert (Result = 0); end if; -- Note: the use of Unrestricted_Access in the following call is needed -- because otherwise we have an error of getting a access-to-volatile -- value which points to a non-volatile object. But in this case it is -- safe to do this, since we know we have no problems with aliasing and -- Unrestricted_Access bypasses this check. Result := pthread_create (T.Common.LL.Thread'Unrestricted_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; 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; ATCB_Allocation.Free_ATCB (T); 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; loop -- Loop in case pthread_cond_wait returns earlier than expected -- (e.g. in case of EINTR caused by a signal). Result := pthread_cond_wait (S.CV'Access, S.L'Access); pragma Assert (Result = 0 or else Result = EINTR); exit when not S.Waiting; end loop; 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 -- The DEC Ada facility code defined in Starlet Ada_Facility : constant := 49; function DBGEXT (Control_Block : System.Address) return System.Aux_DEC.Unsigned_Word; -- DBGEXT is imported from s-tasdeb.adb and its parameter re-typed -- as Address to avoid having a VMS specific s-tasdeb.ads. pragma Interface (C, DBGEXT); pragma Import_Function (DBGEXT, "GNAT$DBGEXT"); type Facility_Type is range 0 .. 65535; procedure Debug_Register (ADBGEXT : System.Address; ATCB_Key : pthread_key_t; Facility : Facility_Type; Std_Prolog : Integer); pragma Import (C, Debug_Register, "CMA$DEBUG_REGISTER"); begin Environment_Task_Id := Environment_Task; -- Initialize the lock used to synchronize chain of all ATCBs Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level); Specific.Initialize (Environment_Task); -- Pass the context key on to CMA along with the other parameters Debug_Register ( DBGEXT'Address, -- Our DEBUG handling entry point ATCB_Key, -- CMA context key for our Ada TCB's Ada_Facility, -- Out facility code 0 -- False, we don't have the std TCB prolog ); -- Make environment task known here because it doesn't go through -- Activate_Tasks, which does it for all other tasks. Known_Tasks (Known_Tasks'First) := Environment_Task; Environment_Task.Known_Tasks_Index := Known_Tasks'First; Enter_Task (Environment_Task); end Initialize; ----------------------- -- Set_Task_Affinity -- ----------------------- procedure Set_Task_Affinity (T : ST.Task_Id) is pragma Unreferenced (T); begin -- Setting task affinity is not supported by the underlying system null; end Set_Task_Affinity; end System.Task_Primitives.Operations;