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Diffstat (limited to 'gcc-4.4.3/gcc/ada/s-taprop-linux.adb')
-rw-r--r-- | gcc-4.4.3/gcc/ada/s-taprop-linux.adb | 1281 |
1 files changed, 0 insertions, 1281 deletions
diff --git a/gcc-4.4.3/gcc/ada/s-taprop-linux.adb b/gcc-4.4.3/gcc/ada/s-taprop-linux.adb deleted file mode 100644 index 08bbac10f..000000000 --- a/gcc-4.4.3/gcc/ada/s-taprop-linux.adb +++ /dev/null @@ -1,1281 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNU ADA 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 GNU/Linux (GNU/LinuxThreads) 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.Task_Info; -with System.Tasking.Debug; -with System.Interrupt_Management; -with System.OS_Primitives; -with System.Stack_Checking.Operations; - -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. - -package body System.Task_Primitives.Operations is - - package SSL renames System.Soft_Links; - package SC renames System.Stack_Checking.Operations; - - use System.Tasking.Debug; - use System.Tasking; - use Interfaces.C; - use System.OS_Interface; - use System.Parameters; - use System.OS_Primitives; - use System.Task_Info; - - Use_Alternate_Stack : constant Boolean := Alternate_Stack_Size /= 0; - -- Whether to use an alternate signal stack for stack overflows - - ---------------- - -- 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 - - Unblocked_Signal_Mask : aliased sigset_t; - -- The set of signals that should be unblocked in all tasks - - -- The followings are internal configuration constants needed - - Next_Serial_Number : Task_Serial_Number := 100; - -- We start at 100 (reserve some special values for using in error checks) - - 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"); - - -- The following are effectively constants, but they need to be initialized - -- by calling a pthread_ function. - - Mutex_Attr : aliased pthread_mutexattr_t; - Cond_Attr : aliased pthread_condattr_t; - - 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 -- - ----------------------- - - subtype unsigned_long is Interfaces.C.unsigned_long; - - procedure Abort_Handler (signo : Signal); - - function To_pthread_t is new Ada.Unchecked_Conversion - (unsigned_long, System.OS_Interface.pthread_t); - - ------------------- - -- Abort_Handler -- - ------------------- - - procedure Abort_Handler (signo : Signal) is - pragma Unreferenced (signo); - - Self_Id : constant Task_Id := Self; - Result : Interfaces.C.int; - Old_Set : aliased sigset_t; - - begin - 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; - - -------------- - -- 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; - - ----------------- - -- Stack_Guard -- - ----------------- - - -- The underlying thread system extends the memory (up to 2MB) when needed - - 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 - pragma Unreferenced (Prio); - - Result : Interfaces.C.int; - - begin - Result := pthread_mutex_init (L, Mutex_Attr'Access); - - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = ENOMEM then - raise Storage_Error with "Failed to allocate a lock"; - end if; - end Initialize_Lock; - - procedure Initialize_Lock - (L : not null access RTS_Lock; - Level : Lock_Level) - is - pragma Unreferenced (Level); - - Result : Interfaces.C.int; - - begin - Result := pthread_mutex_init (L, Mutex_Attr'Access); - - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = ENOMEM then - raise Storage_Error; - end if; - end Initialize_Lock; - - ------------------- - -- Finalize_Lock -- - ------------------- - - procedure Finalize_Lock (L : not null access Lock) is - Result : Interfaces.C.int; - begin - Result := pthread_mutex_destroy (L); - pragma Assert (Result = 0); - end Finalize_Lock; - - procedure Finalize_Lock (L : 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 - Result : Interfaces.C.int; - begin - Result := pthread_mutex_lock (L); - Ceiling_Violation := Result = EINVAL; - - -- Assume the cause of EINVAL is a priority ceiling violation - - pragma Assert (Result = 0 or else Result = EINVAL); - 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); - 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 - pragma Assert (Self_ID = Self); - - 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); - 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); - - Base_Time : constant Duration := Monotonic_Clock; - Check_Time : Duration := Base_Time; - Abs_Time : Duration; - Request : aliased timespec; - Result : Interfaces.C.int; - - begin - Timedout := True; - Yielded := False; - - if Mode = Relative then - Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time; - else - Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time); - end if; - - if Abs_Time > Check_Time then - Request := To_Timespec (Abs_Time); - - loop - exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level; - - if Single_Lock then - Result := - pthread_cond_timedwait - (Self_ID.Common.LL.CV'Access, - Single_RTS_Lock'Access, - Request'Access); - - else - Result := - pthread_cond_timedwait - (Self_ID.Common.LL.CV'Access, - Self_ID.Common.LL.L'Access, - Request'Access); - end if; - - Check_Time := Monotonic_Clock; - exit when Abs_Time <= Check_Time or else Check_Time < Base_Time; - - if Result = 0 or else Result = EINTR then - - -- Somebody may have called Wakeup for us - - Timedout := False; - exit; - end if; - - pragma Assert (Result = ETIMEDOUT); - end loop; - end if; - end Timed_Sleep; - - ----------------- - -- Timed_Delay -- - ----------------- - - -- This is for use in implementing delay statements, so we assume the - -- caller is abort-deferred but is holding no locks. - - procedure Timed_Delay - (Self_ID : Task_Id; - Time : Duration; - Mode : ST.Delay_Modes) - is - Base_Time : constant Duration := Monotonic_Clock; - Check_Time : Duration := Base_Time; - Abs_Time : Duration; - Request : aliased timespec; - - Result : Interfaces.C.int; - pragma Warnings (Off, Result); - - begin - if Single_Lock then - Lock_RTS; - end if; - - Write_Lock (Self_ID); - - if Mode = Relative then - Abs_Time := Time + Check_Time; - else - Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time); - end if; - - if Abs_Time > Check_Time then - Request := To_Timespec (Abs_Time); - Self_ID.Common.State := Delay_Sleep; - - loop - exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level; - - if Single_Lock then - Result := pthread_cond_timedwait - (Self_ID.Common.LL.CV'Access, - Single_RTS_Lock'Access, - Request'Access); - else - Result := pthread_cond_timedwait - (Self_ID.Common.LL.CV'Access, - Self_ID.Common.LL.L'Access, - Request'Access); - end if; - - Check_Time := Monotonic_Clock; - exit when Abs_Time <= Check_Time or else Check_Time < Base_Time; - - pragma Assert (Result = 0 or else - Result = ETIMEDOUT or else - Result = EINTR); - end loop; - - Self_ID.Common.State := Runnable; - end if; - - Unlock (Self_ID); - - if Single_Lock then - Unlock_RTS; - end if; - - Result := sched_yield; - end Timed_Delay; - - --------------------- - -- Monotonic_Clock -- - --------------------- - - function Monotonic_Clock return Duration is - TV : aliased struct_timeval; - Result : Interfaces.C.int; - begin - Result := gettimeofday (TV'Access, System.Null_Address); - pragma Assert (Result = 0); - return To_Duration (TV); - end Monotonic_Clock; - - ------------------- - -- RT_Resolution -- - ------------------- - - function RT_Resolution return Duration is - begin - return 10#1.0#E-6; - 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; - - -- Priorities are 1 .. 99 on GNU/Linux, so we map 0 .. 98 to 1 .. 99 - - Param.sched_priority := Interfaces.C.int (Prio) + 1; - - 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 - Param.sched_priority := 0; - Result := - pthread_setschedparam - (T.Common.LL.Thread, - SCHED_OTHER, Param'Access); - end if; - - pragma Assert (Result = 0 or else Result = EPERM); - 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 - if Self_ID.Common.Task_Info /= null - and then Self_ID.Common.Task_Info.CPU_Affinity = No_CPU - then - raise Invalid_CPU_Number; - end if; - - 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; - - if Use_Alternate_Stack then - declare - Stack : aliased stack_t; - Result : Interfaces.C.int; - begin - Stack.ss_sp := Self_ID.Common.Task_Alternate_Stack; - Stack.ss_size := Alternate_Stack_Size; - Stack.ss_flags := 0; - Result := sigaltstack (Stack'Access, null); - pragma Assert (Result = 0); - end; - 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 (pthread_self); - end if; - end Register_Foreign_Thread; - - -------------------- - -- Initialize_TCB -- - -------------------- - - procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is - Result : Interfaces.C.int; - - begin - -- Give the task a unique serial number - - Self_ID.Serial_Number := Next_Serial_Number; - Next_Serial_Number := Next_Serial_Number + 1; - pragma Assert (Next_Serial_Number /= 0); - - Self_ID.Common.LL.Thread := To_pthread_t (-1); - - if not Single_Lock then - Result := pthread_mutex_init (Self_ID.Common.LL.L'Access, - Mutex_Attr'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result /= 0 then - Succeeded := False; - return; - end if; - end if; - - Result := pthread_cond_init (Self_ID.Common.LL.CV'Access, - Cond_Attr'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - 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; - 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; - Adjusted_Stack_Size : Interfaces.C.size_t; - Result : Interfaces.C.int; - - begin - Adjusted_Stack_Size := - Interfaces.C.size_t (Stack_Size + Alternate_Stack_Size); - - 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_setstacksize - (Attributes'Access, Adjusted_Stack_Size); - pragma Assert (Result = 0); - - Result := - pthread_attr_setdetachstate - (Attributes'Access, PTHREAD_CREATE_DETACHED); - pragma Assert (Result = 0); - - -- 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. - - Result := pthread_create - (T.Common.LL.Thread'Access, - Attributes'Access, - Thread_Body_Access (Wrapper), - To_Address (T)); - pragma Assert - (Result = 0 or else Result = EAGAIN or else Result = ENOMEM); - - if Result /= 0 then - Succeeded := False; - Result := pthread_attr_destroy (Attributes'Access); - pragma Assert (Result = 0); - return; - end if; - - Succeeded := True; - - -- Handle Task_Info - - if T.Common.Task_Info /= null then - if T.Common.Task_Info.CPU_Affinity /= Task_Info.Any_CPU then - Result := - pthread_setaffinity_np - (T.Common.LL.Thread, - CPU_SETSIZE / 8, - T.Common.Task_Info.CPU_Affinity'Access); - pragma Assert (Result = 0); - end if; - end if; - - Result := pthread_attr_destroy (Attributes'Access); - pragma Assert (Result = 0); - - Set_Priority (T, Priority); - 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); - - 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; - SC.Invalidate_Stack_Cache (T.Common.Compiler_Data.Pri_Stack_Info'Access); - Free (Tmp); - - if Is_Self then - Specific.Set (null); - 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 : Interfaces.C.int; - begin - Result := - pthread_kill - (T.Common.LL.Thread, - Signal (System.Interrupt_Management.Abort_Task_Interrupt)); - pragma Assert (Result = 0); - end Abort_Task; - - ---------------- - -- Initialize -- - ---------------- - - procedure Initialize (S : in out Suspension_Object) is - Result : Interfaces.C.int; - - begin - -- Initialize internal state (always to False (RM D.10(6))) - - S.State := False; - S.Waiting := False; - - -- Initialize internal mutex - - Result := pthread_mutex_init (S.L'Access, Mutex_Attr'Access); - - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = ENOMEM then - raise Storage_Error; - end if; - - -- Initialize internal condition variable - - 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 - raise Storage_Error; - end if; - end if; - end Initialize; - - -------------- - -- Finalize -- - -------------- - - procedure Finalize (S : in out Suspension_Object) is - Result : Interfaces.C.int; - - begin - -- Destroy internal mutex - - Result := pthread_mutex_destroy (S.L'Access); - pragma Assert (Result = 0); - - -- Destroy internal condition variable - - Result := pthread_cond_destroy (S.CV'Access); - pragma Assert (Result = 0); - end Finalize; - - ------------------- - -- Current_State -- - ------------------- - - function Current_State (S : Suspension_Object) return Boolean is - begin - -- We do not want to use lock on this read operation. State is marked - -- as Atomic so that we ensure that the value retrieved is correct. - - return S.State; - end Current_State; - - --------------- - -- Set_False -- - --------------- - - procedure Set_False (S : in out Suspension_Object) is - Result : Interfaces.C.int; - - begin - SSL.Abort_Defer.all; - - Result := pthread_mutex_lock (S.L'Access); - pragma Assert (Result = 0); - - S.State := False; - - Result := pthread_mutex_unlock (S.L'Access); - pragma Assert (Result = 0); - - SSL.Abort_Undefer.all; - end Set_False; - - -------------- - -- Set_True -- - -------------- - - procedure Set_True (S : in out Suspension_Object) is - Result : Interfaces.C.int; - - begin - SSL.Abort_Defer.all; - - Result := pthread_mutex_lock (S.L'Access); - pragma Assert (Result = 0); - - -- If there is already a task waiting on this suspension object then - -- we resume it, leaving the state of the suspension object to False, - -- as it is specified in ARM D.10 par. 9. Otherwise, it just leaves - -- the state to True. - - if S.Waiting then - S.Waiting := False; - S.State := False; - - Result := pthread_cond_signal (S.CV'Access); - pragma Assert (Result = 0); - - else - S.State := True; - end if; - - Result := pthread_mutex_unlock (S.L'Access); - pragma Assert (Result = 0); - - SSL.Abort_Undefer.all; - end Set_True; - - ------------------------ - -- Suspend_Until_True -- - ------------------------ - - procedure Suspend_Until_True (S : in out Suspension_Object) is - Result : Interfaces.C.int; - - begin - SSL.Abort_Defer.all; - - Result := pthread_mutex_lock (S.L'Access); - pragma Assert (Result = 0); - - if S.Waiting then - - -- Program_Error must be raised upon calling Suspend_Until_True - -- if another task is already waiting on that suspension object - -- (RM D.10(10)). - - Result := pthread_mutex_unlock (S.L'Access); - pragma Assert (Result = 0); - - SSL.Abort_Undefer.all; - - raise Program_Error; - else - -- Suspend the task if the state is False. Otherwise, the task - -- continues its execution, and the state of the suspension object - -- is set to False (ARM D.10 par. 9). - - if S.State then - S.State := False; - else - S.Waiting := True; - Result := pthread_cond_wait (S.CV'Access, S.L'Access); - end if; - - Result := pthread_mutex_unlock (S.L'Access); - pragma Assert (Result = 0); - - SSL.Abort_Undefer.all; - end if; - end Suspend_Until_True; - - ---------------- - -- Check_Exit -- - ---------------- - - -- 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; - - ------------------ - -- Suspend_Task -- - ------------------ - - function Suspend_Task - (T : ST.Task_Id; - Thread_Self : Thread_Id) return Boolean - is - begin - if T.Common.LL.Thread /= Thread_Self then - return pthread_kill (T.Common.LL.Thread, SIGSTOP) = 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 /= Thread_Self then - return pthread_kill (T.Common.LL.Thread, SIGCONT) = 0; - else - return True; - end if; - 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 - act : aliased struct_sigaction; - old_act : aliased struct_sigaction; - Tmp_Set : aliased sigset_t; - Result : Interfaces.C.int; - -- Whether to use an alternate signal stack for stack overflows - - function State - (Int : System.Interrupt_Management.Interrupt_ID) return Character; - pragma Import (C, State, "__gnat_get_interrupt_state"); - -- Get interrupt state. Defined in a-init.c - -- The input argument is the interrupt number, - -- and the result is one of the following: - - Default : constant Character := 's'; - -- 'n' this interrupt not set by any Interrupt_State pragma - -- 'u' Interrupt_State pragma set state to User - -- 'r' Interrupt_State pragma set state to Runtime - -- 's' Interrupt_State pragma set state to System (use "default" - -- system handler) - - begin - Environment_Task_Id := Environment_Task; - - Interrupt_Management.Initialize; - - -- Prepare the set of signals that should be unblocked in all tasks - - Result := sigemptyset (Unblocked_Signal_Mask'Access); - pragma Assert (Result = 0); - - for J in Interrupt_Management.Interrupt_ID loop - if System.Interrupt_Management.Keep_Unmasked (J) then - Result := sigaddset (Unblocked_Signal_Mask'Access, Signal (J)); - pragma Assert (Result = 0); - end if; - end loop; - - Result := pthread_mutexattr_init (Mutex_Attr'Access); - pragma Assert (Result = 0); - - Result := pthread_condattr_init (Cond_Attr'Access); - pragma Assert (Result = 0); - - Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level); - - -- Initialize the global RTS lock - - Specific.Initialize (Environment_Task); - - if Use_Alternate_Stack then - Environment_Task.Common.Task_Alternate_Stack := - Alternate_Stack'Address; - end if; - - Enter_Task (Environment_Task); - - -- Install the abort-signal handler - - if State - (System.Interrupt_Management.Abort_Task_Interrupt) /= Default - then - 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); - end if; - end Initialize; - -end System.Task_Primitives.Operations; |