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Diffstat (limited to 'gcc-4.4.3/gcc/ada/s-taprop-vxworks.adb')
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diff --git a/gcc-4.4.3/gcc/ada/s-taprop-vxworks.adb b/gcc-4.4.3/gcc/ada/s-taprop-vxworks.adb deleted file mode 100644 index 40ded21b2..000000000 --- a/gcc-4.4.3/gcc/ada/s-taprop-vxworks.adb +++ /dev/null @@ -1,1401 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- 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 the VxWorks 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.Interrupt_Management; - -with System.Soft_Links; --- 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.VxWorks.Ext; - -package body System.Task_Primitives.Operations is - - package SSL renames System.Soft_Links; - - use System.Tasking.Debug; - use System.Tasking; - use System.OS_Interface; - use System.Parameters; - use type System.VxWorks.Ext.t_id; - use type Interfaces.C.int; - - subtype int is System.OS_Interface.int; - - Relative : constant := 0; - - ---------------- - -- 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 - - Environment_Task_Id : Task_Id; - -- A variable to hold Task_Id for the environment task - - Unblocked_Signal_Mask : aliased sigset_t; - -- The set of signals that should unblocked in all tasks - - -- The followings are internal configuration constants needed - - Time_Slice_Val : Integer; - pragma Import (C, Time_Slice_Val, "__gl_time_slice_val"); - - Locking_Policy : Character; - pragma Import (C, Locking_Policy, "__gl_locking_policy"); - - Dispatching_Policy : Character; - pragma Import (C, Dispatching_Policy, "__gl_task_dispatching_policy"); - - function Get_Policy (Prio : System.Any_Priority) return Character; - pragma Import (C, Get_Policy, "__gnat_get_specific_dispatching"); - -- Get priority specific dispatching policy - - Mutex_Protocol : Priority_Type; - - Foreign_Task_Elaborated : aliased Boolean := True; - -- Used to identified fake tasks (i.e., non-Ada Threads) - - type Set_Stack_Limit_Proc_Acc is access procedure; - pragma Convention (C, Set_Stack_Limit_Proc_Acc); - - Set_Stack_Limit_Hook : Set_Stack_Limit_Proc_Acc; - pragma Import (C, Set_Stack_Limit_Hook, "__gnat_set_stack_limit_hook"); - -- Procedure to be called when a task is created to set stack - -- limit. - - -------------------- - -- Local Packages -- - -------------------- - - package Specific is - - procedure Initialize; - pragma Inline (Initialize); - -- Initialize task specific data - - 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 - - procedure Delete; - pragma Inline (Delete); - -- Delete the task specific data associated with 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 -- - ----------------------- - - procedure Abort_Handler (signo : Signal); - -- Handler for the abort (SIGABRT) signal to handle asynchronous abort - - procedure Install_Signal_Handlers; - -- Install the default signal handlers for the current task - - function To_Address is - new Ada.Unchecked_Conversion (Task_Id, System.Address); - - ------------------- - -- Abort_Handler -- - ------------------- - - procedure Abort_Handler (signo : Signal) is - pragma Unreferenced (signo); - - Self_ID : constant Task_Id := Self; - Old_Set : aliased sigset_t; - - Result : int; - pragma Warnings (Off, Result); - - begin - -- It is not safe to raise an exception when using ZCX and the GCC - -- exception handling mechanism. - - if ZCX_By_Default and then GCC_ZCX_Support then - return; - end if; - - if Self_ID.Deferral_Level = 0 - and then Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level - and then not Self_ID.Aborting - then - Self_ID.Aborting := True; - - -- Make sure signals used for RTS internal purpose are unmasked - - Result := - pthread_sigmask - (SIG_UNBLOCK, - Unblocked_Signal_Mask'Access, - Old_Set'Access); - pragma Assert (Result = 0); - - raise Standard'Abort_Signal; - end if; - end Abort_Handler; - - ----------------- - -- Stack_Guard -- - ----------------- - - procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is - pragma Unreferenced (T); - pragma Unreferenced (On); - - begin - -- Nothing needed (why not???) - - 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; - - ----------------------------- - -- Install_Signal_Handlers -- - ----------------------------- - - procedure Install_Signal_Handlers is - act : aliased struct_sigaction; - old_act : aliased struct_sigaction; - Tmp_Set : aliased sigset_t; - Result : int; - - begin - act.sa_flags := 0; - act.sa_handler := Abort_Handler'Address; - - Result := sigemptyset (Tmp_Set'Access); - pragma Assert (Result = 0); - act.sa_mask := Tmp_Set; - - Result := - sigaction - (Signal (Interrupt_Management.Abort_Task_Interrupt), - act'Unchecked_Access, - old_act'Unchecked_Access); - pragma Assert (Result = 0); - - Interrupt_Management.Initialize_Interrupts; - end Install_Signal_Handlers; - - --------------------- - -- Initialize_Lock -- - --------------------- - - procedure Initialize_Lock - (Prio : System.Any_Priority; - L : not null access Lock) - is - begin - L.Mutex := semMCreate (SEM_Q_PRIORITY + SEM_INVERSION_SAFE); - L.Prio_Ceiling := int (Prio); - L.Protocol := Mutex_Protocol; - pragma Assert (L.Mutex /= 0); - end Initialize_Lock; - - procedure Initialize_Lock - (L : not null access RTS_Lock; - Level : Lock_Level) - is - pragma Unreferenced (Level); - begin - L.Mutex := semMCreate (SEM_Q_PRIORITY + SEM_INVERSION_SAFE); - L.Prio_Ceiling := int (System.Any_Priority'Last); - L.Protocol := Mutex_Protocol; - pragma Assert (L.Mutex /= 0); - end Initialize_Lock; - - ------------------- - -- Finalize_Lock -- - ------------------- - - procedure Finalize_Lock (L : not null access Lock) is - Result : int; - begin - Result := semDelete (L.Mutex); - pragma Assert (Result = 0); - end Finalize_Lock; - - procedure Finalize_Lock (L : not null access RTS_Lock) is - Result : int; - begin - Result := semDelete (L.Mutex); - pragma Assert (Result = 0); - end Finalize_Lock; - - ---------------- - -- Write_Lock -- - ---------------- - - procedure Write_Lock - (L : not null access Lock; - Ceiling_Violation : out Boolean) - is - Result : int; - - begin - if L.Protocol = Prio_Protect - and then int (Self.Common.Current_Priority) > L.Prio_Ceiling - then - Ceiling_Violation := True; - return; - else - Ceiling_Violation := False; - end if; - - Result := semTake (L.Mutex, WAIT_FOREVER); - pragma Assert (Result = 0); - end Write_Lock; - - procedure Write_Lock - (L : not null access RTS_Lock; - Global_Lock : Boolean := False) - is - Result : int; - begin - if not Single_Lock or else Global_Lock then - Result := semTake (L.Mutex, WAIT_FOREVER); - pragma Assert (Result = 0); - end if; - end Write_Lock; - - procedure Write_Lock (T : Task_Id) is - Result : int; - begin - if not Single_Lock then - Result := semTake (T.Common.LL.L.Mutex, WAIT_FOREVER); - 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 : int; - begin - Result := semGive (L.Mutex); - pragma Assert (Result = 0); - end Unlock; - - procedure Unlock - (L : not null access RTS_Lock; - Global_Lock : Boolean := False) - is - Result : int; - begin - if not Single_Lock or else Global_Lock then - Result := semGive (L.Mutex); - pragma Assert (Result = 0); - end if; - end Unlock; - - procedure Unlock (T : Task_Id) is - Result : int; - begin - if not Single_Lock then - Result := semGive (T.Common.LL.L.Mutex); - 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 : int; - - begin - pragma Assert (Self_ID = Self); - - -- Release the mutex before sleeping - - if Single_Lock then - Result := semGive (Single_RTS_Lock.Mutex); - else - Result := semGive (Self_ID.Common.LL.L.Mutex); - end if; - - pragma Assert (Result = 0); - - -- Perform a blocking operation to take the CV semaphore. Note that a - -- blocking operation in VxWorks will reenable task scheduling. When we - -- are no longer blocked and control is returned, task scheduling will - -- again be disabled. - - Result := semTake (Self_ID.Common.LL.CV, WAIT_FOREVER); - pragma Assert (Result = 0); - - -- Take the mutex back - - if Single_Lock then - Result := semTake (Single_RTS_Lock.Mutex, WAIT_FOREVER); - else - Result := semTake (Self_ID.Common.LL.L.Mutex, WAIT_FOREVER); - end if; - - pragma Assert (Result = 0); - end Sleep; - - ----------------- - -- Timed_Sleep -- - ----------------- - - -- This is for use within the run-time system, so abort is assumed to be - -- already deferred, and the caller should be holding its own ATCB lock. - - 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); - - Orig : constant Duration := Monotonic_Clock; - Absolute : Duration; - Ticks : int; - Result : int; - Wakeup : Boolean := False; - - begin - Timedout := False; - Yielded := True; - - if Mode = Relative then - Absolute := Orig + Time; - - -- Systematically add one since the first tick will delay *at most* - -- 1 / Rate_Duration seconds, so we need to add one to be on the - -- safe side. - - Ticks := To_Clock_Ticks (Time); - - if Ticks > 0 and then Ticks < int'Last then - Ticks := Ticks + 1; - end if; - - else - Absolute := Time; - Ticks := To_Clock_Ticks (Time - Monotonic_Clock); - end if; - - if Ticks > 0 then - loop - -- Release the mutex before sleeping - - if Single_Lock then - Result := semGive (Single_RTS_Lock.Mutex); - else - Result := semGive (Self_ID.Common.LL.L.Mutex); - end if; - - pragma Assert (Result = 0); - - -- Perform a blocking operation to take the CV semaphore. Note - -- that a blocking operation in VxWorks will reenable task - -- scheduling. When we are no longer blocked and control is - -- returned, task scheduling will again be disabled. - - Result := semTake (Self_ID.Common.LL.CV, Ticks); - - if Result = 0 then - - -- Somebody may have called Wakeup for us - - Wakeup := True; - - else - if errno /= S_objLib_OBJ_TIMEOUT then - Wakeup := True; - - else - -- If Ticks = int'last, it was most probably truncated so - -- let's make another round after recomputing Ticks from - -- the absolute time. - - if Ticks /= int'Last then - Timedout := True; - - else - Ticks := To_Clock_Ticks (Absolute - Monotonic_Clock); - - if Ticks < 0 then - Timedout := True; - end if; - end if; - end if; - end if; - - -- Take the mutex back - - if Single_Lock then - Result := semTake (Single_RTS_Lock.Mutex, WAIT_FOREVER); - else - Result := semTake (Self_ID.Common.LL.L.Mutex, WAIT_FOREVER); - end if; - - pragma Assert (Result = 0); - - exit when Timedout or Wakeup; - end loop; - - else - Timedout := True; - - -- Should never hold a lock while yielding - - if Single_Lock then - Result := semGive (Single_RTS_Lock.Mutex); - taskDelay (0); - Result := semTake (Single_RTS_Lock.Mutex, WAIT_FOREVER); - - else - Result := semGive (Self_ID.Common.LL.L.Mutex); - taskDelay (0); - Result := semTake (Self_ID.Common.LL.L.Mutex, WAIT_FOREVER); - end if; - end if; - end Timed_Sleep; - - ----------------- - -- Timed_Delay -- - ----------------- - - -- This is for use in implementing delay statements, so we assume the - -- caller is holding no locks. - - procedure Timed_Delay - (Self_ID : Task_Id; - Time : Duration; - Mode : ST.Delay_Modes) - is - Orig : constant Duration := Monotonic_Clock; - Absolute : Duration; - Ticks : int; - Timedout : Boolean; - Aborted : Boolean := False; - - Result : int; - pragma Warnings (Off, Result); - - begin - if Mode = Relative then - Absolute := Orig + Time; - Ticks := To_Clock_Ticks (Time); - - if Ticks > 0 and then Ticks < int'Last then - - -- First tick will delay anytime between 0 and 1 / sysClkRateGet - -- seconds, so we need to add one to be on the safe side. - - Ticks := Ticks + 1; - end if; - - else - Absolute := Time; - Ticks := To_Clock_Ticks (Time - Orig); - end if; - - if Ticks > 0 then - - -- Modifying State, locking the TCB - - if Single_Lock then - Result := semTake (Single_RTS_Lock.Mutex, WAIT_FOREVER); - else - Result := semTake (Self_ID.Common.LL.L.Mutex, WAIT_FOREVER); - end if; - - pragma Assert (Result = 0); - - Self_ID.Common.State := Delay_Sleep; - Timedout := False; - - loop - Aborted := Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level; - - -- Release the TCB before sleeping - - if Single_Lock then - Result := semGive (Single_RTS_Lock.Mutex); - else - Result := semGive (Self_ID.Common.LL.L.Mutex); - end if; - pragma Assert (Result = 0); - - exit when Aborted; - - Result := semTake (Self_ID.Common.LL.CV, Ticks); - - if Result /= 0 then - - -- If Ticks = int'last, it was most probably truncated - -- so let's make another round after recomputing Ticks - -- from the absolute time. - - if errno = S_objLib_OBJ_TIMEOUT and then Ticks /= int'Last then - Timedout := True; - else - Ticks := To_Clock_Ticks (Absolute - Monotonic_Clock); - - if Ticks < 0 then - Timedout := True; - end if; - end if; - end if; - - -- Take back the lock after having slept, to protect further - -- access to Self_ID. - - if Single_Lock then - Result := semTake (Single_RTS_Lock.Mutex, WAIT_FOREVER); - else - Result := semTake (Self_ID.Common.LL.L.Mutex, WAIT_FOREVER); - end if; - - pragma Assert (Result = 0); - - exit when Timedout; - end loop; - - Self_ID.Common.State := Runnable; - - if Single_Lock then - Result := semGive (Single_RTS_Lock.Mutex); - else - Result := semGive (Self_ID.Common.LL.L.Mutex); - end if; - - else - taskDelay (0); - end if; - end Timed_Delay; - - --------------------- - -- Monotonic_Clock -- - --------------------- - - function Monotonic_Clock return Duration is - TS : aliased timespec; - Result : int; - begin - Result := clock_gettime (CLOCK_REALTIME, TS'Unchecked_Access); - pragma Assert (Result = 0); - return To_Duration (TS); - end Monotonic_Clock; - - ------------------- - -- RT_Resolution -- - ------------------- - - function RT_Resolution return Duration is - begin - return 1.0 / Duration (sysClkRateGet); - end RT_Resolution; - - ------------ - -- Wakeup -- - ------------ - - procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is - pragma Unreferenced (Reason); - Result : int; - begin - Result := semGive (T.Common.LL.CV); - pragma Assert (Result = 0); - end Wakeup; - - ----------- - -- Yield -- - ----------- - - procedure Yield (Do_Yield : Boolean := True) is - pragma Unreferenced (Do_Yield); - Result : int; - pragma Unreferenced (Result); - begin - Result := taskDelay (0); - end Yield; - - ------------------ - -- Set_Priority -- - ------------------ - - type Prio_Array_Type is array (System.Any_Priority) of Integer; - pragma Atomic_Components (Prio_Array_Type); - - Prio_Array : Prio_Array_Type; - -- Global array containing the id of the currently running task for each - -- priority. Note that we assume that we are on a single processor with - -- run-till-blocked scheduling. - - procedure Set_Priority - (T : Task_Id; - Prio : System.Any_Priority; - Loss_Of_Inheritance : Boolean := False) - is - Array_Item : Integer; - Result : int; - - begin - Result := - taskPrioritySet - (T.Common.LL.Thread, To_VxWorks_Priority (int (Prio))); - pragma Assert (Result = 0); - - if (Dispatching_Policy = 'F' or else Get_Policy (Prio) = 'F') - and then Loss_Of_Inheritance - and then Prio < T.Common.Current_Priority - then - -- Annex D requirement (RM D.2.2(9)): - - -- If the task drops its priority due to the loss of inherited - -- priority, it is added at the head of the ready queue for its - -- new active priority. - - Array_Item := Prio_Array (T.Common.Base_Priority) + 1; - Prio_Array (T.Common.Base_Priority) := Array_Item; - - loop - -- Give some processes a chance to arrive - - taskDelay (0); - - -- Then wait for our turn to proceed - - exit when Array_Item = Prio_Array (T.Common.Base_Priority) - or else Prio_Array (T.Common.Base_Priority) = 1; - end loop; - - Prio_Array (T.Common.Base_Priority) := - Prio_Array (T.Common.Base_Priority) - 1; - end if; - - T.Common.Current_Priority := Prio; - 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 - procedure Init_Float; - pragma Import (C, Init_Float, "__gnat_init_float"); - -- Properly initializes the FPU for PPC/MIPS systems - - begin - -- Store the user-level task id in the Thread field (to be used - -- internally by the run-time system) and the kernel-level task id in - -- the LWP field (to be used by the debugger). - - Self_ID.Common.LL.Thread := taskIdSelf; - Self_ID.Common.LL.LWP := getpid; - - Specific.Set (Self_ID); - - Init_Float; - - -- Install the signal handlers - - -- This is called for each task since there is no signal inheritance - -- between VxWorks tasks. - - Install_Signal_Handlers; - - 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; - - -- If stack checking is enabled, set the stack limit for this task - - if Set_Stack_Limit_Hook /= null then - Set_Stack_Limit_Hook.all; - end if; - 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 (taskIdSelf); - end if; - end Register_Foreign_Thread; - - -------------------- - -- Initialize_TCB -- - -------------------- - - procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is - begin - Self_ID.Common.LL.CV := semBCreate (SEM_Q_PRIORITY, SEM_EMPTY); - Self_ID.Common.LL.Thread := 0; - - if Self_ID.Common.LL.CV = 0 then - Succeeded := False; - - else - Succeeded := True; - - if not Single_Lock then - Initialize_Lock (Self_ID.Common.LL.L'Access, ATCB_Level); - end if; - end if; - 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 - Adjusted_Stack_Size : size_t; - begin - -- Ask for four extra bytes of stack space so that the ATCB pointer can - -- be stored below the stack limit, plus extra space for the frame of - -- Task_Wrapper. This is so the user gets the amount of stack requested - -- exclusive of the needs. - - -- We also have to allocate n more bytes for the task name storage and - -- enough space for the Wind Task Control Block which is around 0x778 - -- bytes. VxWorks also seems to carve out additional space, so use 2048 - -- as a nice round number. We might want to increment to the nearest - -- page size in case we ever support VxVMI. - - -- ??? - we should come back and visit this so we can set the task name - -- to something appropriate. - - Adjusted_Stack_Size := size_t (Stack_Size) + 2048; - - -- Since the initial signal mask of a thread is inherited from the - -- creator, and the Environment task has all its signals masked, we do - -- not need to manipulate caller's signal mask at this point. All tasks - -- in RTS will have All_Tasks_Mask initially. - - -- We now compute the VxWorks task name and options, then spawn ... - - declare - Name : aliased String (1 .. T.Common.Task_Image_Len + 1); - Name_Address : System.Address; - -- Task name we are going to hand down to VxWorks - - function Get_Task_Options return int; - pragma Import (C, Get_Task_Options, "__gnat_get_task_options"); - -- Function that returns the options to be set for the task that we - -- are creating. We fetch the options assigned to the current task, - -- so offering some user level control over the options for a task - -- hierarchy, and force VX_FP_TASK because it is almost always - -- required. - - begin - -- If there is no Ada task name handy, let VxWorks choose one. - -- Otherwise, tell VxWorks what the Ada task name is. - - if T.Common.Task_Image_Len = 0 then - Name_Address := System.Null_Address; - else - Name (1 .. Name'Last - 1) := - T.Common.Task_Image (1 .. T.Common.Task_Image_Len); - Name (Name'Last) := ASCII.NUL; - Name_Address := Name'Address; - end if; - - -- Now spawn the VxWorks task for real - - T.Common.LL.Thread := - taskSpawn - (Name_Address, - To_VxWorks_Priority (int (Priority)), - Get_Task_Options, - Adjusted_Stack_Size, - Wrapper, - To_Address (T)); - end; - - if T.Common.LL.Thread = -1 then - Succeeded := False; - else - Succeeded := True; - Task_Creation_Hook (T.Common.LL.Thread); - Set_Priority (T, Priority); - end if; - end Create_Task; - - ------------------ - -- Finalize_TCB -- - ------------------ - - procedure Finalize_TCB (T : Task_Id) is - Result : int; - Tmp : Task_Id := T; - Is_Self : constant Boolean := (T = Self); - - procedure Free is new - Ada.Unchecked_Deallocation (Ada_Task_Control_Block, Task_Id); - - begin - if not Single_Lock then - Result := semDelete (T.Common.LL.L.Mutex); - pragma Assert (Result = 0); - end if; - - T.Common.LL.Thread := 0; - - Result := semDelete (T.Common.LL.CV); - pragma Assert (Result = 0); - - if T.Known_Tasks_Index /= -1 then - Known_Tasks (T.Known_Tasks_Index) := null; - end if; - - Free (Tmp); - - if Is_Self then - Specific.Delete; - end if; - end Finalize_TCB; - - --------------- - -- Exit_Task -- - --------------- - - procedure Exit_Task is - begin - Specific.Set (null); - end Exit_Task; - - ---------------- - -- Abort_Task -- - ---------------- - - procedure Abort_Task (T : Task_Id) is - Result : int; - begin - Result := - kill - (T.Common.LL.Thread, - Signal (Interrupt_Management.Abort_Task_Interrupt)); - pragma Assert (Result = 0); - end Abort_Task; - - ---------------- - -- Initialize -- - ---------------- - - procedure Initialize (S : in out Suspension_Object) is - begin - -- Initialize internal state (always to False (RM D.10(6))) - - S.State := False; - S.Waiting := False; - - -- Initialize internal mutex - - -- Use simpler binary semaphore instead of VxWorks - -- mutual exclusion semaphore, because we don't need - -- the fancier semantics and their overhead. - - S.L := semBCreate (SEM_Q_FIFO, SEM_FULL); - - -- Initialize internal condition variable - - S.CV := semBCreate (SEM_Q_FIFO, SEM_EMPTY); - end Initialize; - - -------------- - -- Finalize -- - -------------- - - procedure Finalize (S : in out Suspension_Object) is - pragma Unmodified (S); - -- S may be modified on other targets, but not on VxWorks - - Result : STATUS; - - begin - -- Destroy internal mutex - - Result := semDelete (S.L); - pragma Assert (Result = OK); - - -- Destroy internal condition variable - - Result := semDelete (S.CV); - pragma Assert (Result = OK); - 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 : STATUS; - - begin - SSL.Abort_Defer.all; - - Result := semTake (S.L, WAIT_FOREVER); - pragma Assert (Result = OK); - - S.State := False; - - Result := semGive (S.L); - pragma Assert (Result = OK); - - SSL.Abort_Undefer.all; - end Set_False; - - -------------- - -- Set_True -- - -------------- - - procedure Set_True (S : in out Suspension_Object) is - Result : STATUS; - - begin - SSL.Abort_Defer.all; - - Result := semTake (S.L, WAIT_FOREVER); - pragma Assert (Result = OK); - - -- 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 := semGive (S.CV); - pragma Assert (Result = OK); - else - S.State := True; - end if; - - Result := semGive (S.L); - pragma Assert (Result = OK); - - SSL.Abort_Undefer.all; - end Set_True; - - ------------------------ - -- Suspend_Until_True -- - ------------------------ - - procedure Suspend_Until_True (S : in out Suspension_Object) is - Result : STATUS; - - begin - SSL.Abort_Defer.all; - - Result := semTake (S.L, WAIT_FOREVER); - - if S.Waiting then - - -- Program_Error must be raised upon calling Suspend_Until_True - -- if another task is already waiting on that suspension object - -- (ARM D.10 par. 10). - - Result := semGive (S.L); - pragma Assert (Result = OK); - - 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; - - Result := semGive (S.L); - pragma Assert (Result = 0); - - SSL.Abort_Undefer.all; - - else - S.Waiting := True; - - -- Release the mutex before sleeping - - Result := semGive (S.L); - pragma Assert (Result = OK); - - SSL.Abort_Undefer.all; - - Result := semTake (S.CV, WAIT_FOREVER); - pragma Assert (Result = 0); - end if; - 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 - begin - if T.Common.LL.Thread /= 0 - and then T.Common.LL.Thread /= Thread_Self - then - return taskSuspend (T.Common.LL.Thread) = 0; - else - return True; - end if; - end Suspend_Task; - - ----------------- - -- Resume_Task -- - ----------------- - - function Resume_Task - (T : ST.Task_Id; - Thread_Self : Thread_Id) return Boolean - is - begin - if T.Common.LL.Thread /= 0 - and then T.Common.LL.Thread /= Thread_Self - then - return taskResume (T.Common.LL.Thread) = 0; - else - return True; - end if; - end Resume_Task; - - -------------------- - -- Stop_All_Tasks -- - -------------------- - - procedure Stop_All_Tasks - is - Thread_Self : constant Thread_Id := taskIdSelf; - C : Task_Id; - - Dummy : int; - pragma Unreferenced (Dummy); - - begin - Dummy := Int_Lock; - - C := All_Tasks_List; - while C /= null loop - if C.Common.LL.Thread /= 0 - and then C.Common.LL.Thread /= Thread_Self - then - Dummy := Task_Stop (C.Common.LL.Thread); - end if; - - C := C.Common.All_Tasks_Link; - end loop; - - Dummy := Int_Unlock; - end Stop_All_Tasks; - - --------------- - -- Stop_Task -- - --------------- - - function Stop_Task (T : ST.Task_Id) return Boolean is - begin - if T.Common.LL.Thread /= 0 then - return Task_Stop (T.Common.LL.Thread) = 0; - else - return True; - end if; - end Stop_Task; - - ------------------- - -- Continue_Task -- - ------------------- - - function Continue_Task (T : ST.Task_Id) return Boolean - is - begin - if T.Common.LL.Thread /= 0 then - return Task_Cont (T.Common.LL.Thread) = 0; - else - return True; - end if; - end Continue_Task; - - ---------------- - -- Initialize -- - ---------------- - - procedure Initialize (Environment_Task : Task_Id) is - Result : int; - - begin - Environment_Task_Id := Environment_Task; - - Interrupt_Management.Initialize; - Specific.Initialize; - - if Locking_Policy = 'C' then - Mutex_Protocol := Prio_Protect; - elsif Locking_Policy = 'I' then - Mutex_Protocol := Prio_Inherit; - else - Mutex_Protocol := Prio_None; - end if; - - if Time_Slice_Val > 0 then - Result := - Set_Time_Slice - (To_Clock_Ticks - (Duration (Time_Slice_Val) / Duration (1_000_000.0))); - - elsif Dispatching_Policy = 'R' then - Result := Set_Time_Slice (To_Clock_Ticks (0.01)); - - end if; - - Result := sigemptyset (Unblocked_Signal_Mask'Access); - pragma Assert (Result = 0); - - for J in Interrupt_Management.Signal_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; - - -- Initialize the lock used to synchronize chain of all ATCBs - - Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level); - - Enter_Task (Environment_Task); - end Initialize; - -end System.Task_Primitives.Operations; |