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Diffstat (limited to 'gcc-4.2.1/gcc/ada/s-taprop-tru64.adb')
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1 files changed, 1275 insertions, 0 deletions
diff --git a/gcc-4.2.1/gcc/ada/s-taprop-tru64.adb b/gcc-4.2.1/gcc/ada/s-taprop-tru64.adb new file mode 100644 index 000000000..120657fc4 --- /dev/null +++ b/gcc-4.2.1/gcc/ada/s-taprop-tru64.adb @@ -0,0 +1,1275 @@ +------------------------------------------------------------------------------ +-- -- +-- 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) 1992-2006, 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 2, or (at your option) any later ver- -- +-- sion. GNARL 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. See the GNU General Public License -- +-- for more details. You should have received a copy of the GNU General -- +-- Public License distributed with GNARL; see file COPYING. If not, write -- +-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- +-- Boston, MA 02110-1301, USA. -- +-- -- +-- As a special exception, if other files instantiate generics from this -- +-- unit, or you link this unit with other files to produce an executable, -- +-- this unit does not by itself cause the resulting executable to be -- +-- covered by the GNU General Public License. This exception does not -- +-- however invalidate any other reasons why the executable file might be -- +-- covered by the GNU Public License. -- +-- -- +-- GNARL was developed by the GNARL team at Florida State University. -- +-- Extensive contributions were provided by Ada Core Technologies, Inc. -- +-- -- +------------------------------------------------------------------------------ + +-- This is a DEC Unix 4.0d 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 System.Tasking.Debug; +-- used for Known_Tasks + +with System.Interrupt_Management; +-- used for Keep_Unmasked +-- Abort_Task_Interrupt +-- Interrupt_ID + +with System.OS_Primitives; +-- used for Delay_Modes + +with System.Task_Info; +-- used for Task_Info_Type + +with Interfaces; +-- used for Shift_Left + +with Interfaces.C; +-- used for int +-- size_t + +with System.Soft_Links; +-- used for Abort_Defer/Undefer + +-- 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 Unchecked_Deallocation; + +package body System.Task_Primitives.Operations is + + package SSL renames System.Soft_Links; + + use System.Tasking.Debug; + use System.Tasking; + use Interfaces.C; + use System.OS_Interface; + use System.Parameters; + use System.OS_Primitives; + + ---------------- + -- 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 unblocked in all tasks + + 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"); + + Curpid : pid_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 -- + ----------------------- + + procedure Abort_Handler (Sig : Signal); + -- Signal handler used to implement asynchronous abort + + ------------------- + -- Abort_Handler -- + ------------------- + + procedure Abort_Handler (Sig : Signal) is + pragma Unreferenced (Sig); + + T : constant Task_Id := Self; + Result : Interfaces.C.int; + Old_Set : aliased sigset_t; + + 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 T.Deferral_Level = 0 + and then T.Pending_ATC_Level < T.ATC_Nesting_Level and then + not T.Aborting + then + T.Aborting := True; + + -- Make sure signals used for RTS internal purpose are unmasked + + Result := pthread_sigmask (SIG_UNBLOCK, + Unblocked_Signal_Mask'Unchecked_Access, Old_Set'Unchecked_Access); + pragma Assert (Result = 0); + + raise Standard'Abort_Signal; + end if; + end Abort_Handler; + + ------------------ + -- Stack_Guard -- + ------------------ + + -- The underlying thread system sets a guard page at the + -- bottom of a thread stack, so nothing is 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 rasing Storage_Error in the following routines + -- should be able to be handled safely. + + procedure Initialize_Lock + (Prio : System.Any_Priority; + L : 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; + + if Locking_Policy = 'C' then + L.Ceiling := Interfaces.C.int (Prio); + end if; + + Result := pthread_mutex_init (L.L'Access, Attributes'Access); + pragma Assert (Result = 0 or else Result = ENOMEM); + + if Result = ENOMEM then + Result := pthread_mutexattr_destroy (Attributes'Access); + raise Storage_Error; + end if; + + Result := pthread_mutexattr_destroy (Attributes'Access); + pragma Assert (Result = 0); + end Initialize_Lock; + + procedure Initialize_Lock (L : 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; + + Result := pthread_mutex_init (L, Attributes'Access); + pragma Assert (Result = 0 or else Result = ENOMEM); + + if Result = ENOMEM then + Result := pthread_mutexattr_destroy (Attributes'Access); + raise Storage_Error; + end if; + + Result := pthread_mutexattr_destroy (Attributes'Access); + pragma Assert (Result = 0); + end Initialize_Lock; + + ------------------- + -- Finalize_Lock -- + ------------------- + + procedure Finalize_Lock (L : 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 : 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 : access Lock; Ceiling_Violation : out Boolean) is + Result : Interfaces.C.int; + Self_ID : Task_Id; + All_Tasks_Link : Task_Id; + Current_Prio : System.Any_Priority; + + begin + -- Perform ceiling checks only when this is the locking policy in use + + if Locking_Policy = 'C' then + Self_ID := Self; + All_Tasks_Link := Self_ID.Common.All_Tasks_Link; + Current_Prio := Get_Priority (Self_ID); + + -- If there is no other task, no need to check priorities + + if All_Tasks_Link /= Null_Task + and then L.Ceiling < Interfaces.C.int (Current_Prio) + then + Ceiling_Violation := True; + return; + end if; + end if; + + Result := pthread_mutex_lock (L.L'Access); + pragma Assert (Result = 0); + + Ceiling_Violation := False; + end Write_Lock; + + procedure Write_Lock + (L : 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 : access Lock; Ceiling_Violation : out Boolean) is + begin + Write_Lock (L, Ceiling_Violation); + end Read_Lock; + + ------------ + -- Unlock -- + ------------ + + procedure Unlock (L : access Lock) is + Result : Interfaces.C.int; + begin + Result := pthread_mutex_unlock (L.L'Access); + pragma Assert (Result = 0); + end Unlock; + + procedure Unlock (L : 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; + + ----------- + -- Sleep -- + ----------- + + procedure Sleep + (Self_ID : Task_Id; + Reason : System.Tasking.Task_States) + is + pragma Unreferenced (Reason); + + Result : Interfaces.C.int; + + begin + if Single_Lock then + Result := pthread_cond_wait + (Self_ID.Common.LL.CV'Access, Single_RTS_Lock'Access); + else + Result := pthread_cond_wait + (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L'Access); + end if; + + -- EINTR is not considered a failure + + pragma Assert (Result = 0 or else Result = EINTR); + 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); + + Check_Time : constant Duration := Monotonic_Clock; + 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 + or else Self_ID.Pending_Priority_Change; + + 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; + + exit when Abs_Time <= Monotonic_Clock; + + if Result = 0 or 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 + Check_Time : constant Duration := Monotonic_Clock; + Abs_Time : Duration; + Request : aliased timespec; + Result : Interfaces.C.int; + + 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 + if Self_ID.Pending_Priority_Change then + Self_ID.Pending_Priority_Change := False; + Self_ID.Common.Base_Priority := Self_ID.New_Base_Priority; + Set_Priority (Self_ID, Self_ID.Common.Base_Priority); + end if; + + exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level; + + 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; + + exit when Abs_Time <= Monotonic_Clock; + + 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; + + Yield; + end Timed_Delay; + + --------------------- + -- Monotonic_Clock -- + --------------------- + + function Monotonic_Clock return Duration is + TS : aliased timespec; + Result : Interfaces.C.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 + -- Returned value must be an integral multiple of Duration'Small (1 ns) + -- The following is the best approximation of 1/1024. The clock on the + -- DEC Alpha ticks at 1024 Hz. + + return 0.000_976_563; + 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; + + begin + T.Common.Current_Priority := Prio; + Param.sched_priority := Interfaces.C.int (Underlying_Priorities (Prio)); + + if Time_Slice_Val > 0 then + Result := pthread_setschedparam + (T.Common.LL.Thread, SCHED_RR, Param'Access); + + elsif Dispatching_Policy = 'F' or else Time_Slice_Val = 0 then + Result := pthread_setschedparam + (T.Common.LL.Thread, SCHED_FIFO, Param'Access); + + else + 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 + Hide_Yellow_Zone; + Self_ID.Common.LL.Thread := pthread_self; + Specific.Set (Self_ID); + + Lock_RTS; + + for J in Known_Tasks'Range loop + if Known_Tasks (J) = null then + Known_Tasks (J) := Self_ID; + Self_ID.Known_Tasks_Index := J; + exit; + end if; + end loop; + + Unlock_RTS; + end Enter_Task; + + -------------- + -- New_ATCB -- + -------------- + + function New_ATCB (Entry_Num : Task_Entry_Index) return Task_Id is + begin + return new Ada_Task_Control_Block (Entry_Num); + end New_ATCB; + + ------------------- + -- Is_Valid_Task -- + ------------------- + + function Is_Valid_Task return Boolean renames Specific.Is_Valid_Task; + + ----------------------------- + -- Register_Foreign_Thread -- + ----------------------------- + + function Register_Foreign_Thread return Task_Id is + begin + if Is_Valid_Task then + return Self; + else + return Register_Foreign_Thread (pthread_self); + end if; + end Register_Foreign_Thread; + + -------------------- + -- Initialize_TCB -- + -------------------- + + procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is + Mutex_Attr : aliased pthread_mutexattr_t; + Result : Interfaces.C.int; + Cond_Attr : aliased pthread_condattr_t; + + begin + 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; + Adjusted_Stack_Size : Interfaces.C.size_t; + Result : Interfaces.C.int; + Param : aliased System.OS_Interface.struct_sched_param; + + use System.Task_Info; + + begin + -- Account for the Yellow Zone (2 pages) and the guard page + -- right above. See Hide_Yellow_Zone for the rationale. + + Adjusted_Stack_Size := + Interfaces.C.size_t (Stack_Size) + 3 * Get_Page_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_setdetachstate + (Attributes'Access, PTHREAD_CREATE_DETACHED); + pragma Assert (Result = 0); + + Result := pthread_attr_setstacksize + (Attributes'Access, Adjusted_Stack_Size); + pragma Assert (Result = 0); + + Param.sched_priority := + Interfaces.C.int (Underlying_Priorities (Priority)); + Result := pthread_attr_setschedparam + (Attributes'Access, Param'Access); + pragma Assert (Result = 0); + + if Time_Slice_Val > 0 then + Result := pthread_attr_setschedpolicy + (Attributes'Access, System.OS_Interface.SCHED_RR); + + elsif Dispatching_Policy = 'F' or else Time_Slice_Val = 0 then + Result := pthread_attr_setschedpolicy + (Attributes'Access, System.OS_Interface.SCHED_FIFO); + + else + Result := pthread_attr_setschedpolicy + (Attributes'Access, System.OS_Interface.SCHED_OTHER); + end if; + + pragma Assert (Result = 0); + + -- Set the scheduling parameters explicitly, since this is the + -- only way to force the OS to take e.g. the sched policy and scope + -- attributes into account. + + Result := pthread_attr_setinheritsched + (Attributes'Access, PTHREAD_EXPLICIT_SCHED); + pragma Assert (Result = 0); + + T.Common.Current_Priority := Priority; + + if T.Common.Task_Info /= null then + case T.Common.Task_Info.Contention_Scope is + when System.Task_Info.Process_Scope => + Result := pthread_attr_setscope + (Attributes'Access, PTHREAD_SCOPE_PROCESS); + + when System.Task_Info.System_Scope => + Result := pthread_attr_setscope + (Attributes'Access, PTHREAD_SCOPE_SYSTEM); + + when System.Task_Info.Default_Scope => + Result := 0; + end case; + + pragma Assert (Result = 0); + end if; + + -- 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); + + Succeeded := Result = 0; + + Result := pthread_attr_destroy (Attributes'Access); + pragma Assert (Result = 0); + + if T.Common.Task_Info /= null then + -- ??? We're using a process-wide function to implement a task + -- specific characteristic. + + if T.Common.Task_Info.Bind_To_Cpu_Number = 0 then + Result := bind_to_cpu (Curpid, 0); + elsif T.Common.Task_Info.Bind_To_Cpu_Number > 0 then + Result := bind_to_cpu + (Curpid, + Interfaces.C.unsigned_long ( + Interfaces.Shift_Left + (Interfaces.Unsigned_64'(1), + T.Common.Task_Info.Bind_To_Cpu_Number - 1))); + pragma Assert (Result = 0); + end if; + end if; + end Create_Task; + + ------------------ + -- Finalize_TCB -- + ------------------ + + procedure Finalize_TCB (T : Task_Id) is + Result : Interfaces.C.int; + Tmp : Task_Id := T; + Is_Self : constant Boolean := T = Self; + + procedure Free is new + 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; + + 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 + Mutex_Attr : aliased pthread_mutexattr_t; + Cond_Attr : aliased pthread_condattr_t; + Result : Interfaces.C.int; + begin + -- Initialize internal state. It is always initialized to False (ARM + -- D.10 par. 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); + 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); + + 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 + -- (ARM D.10 par. 10). + + Result := pthread_mutex_unlock (S.L'Access); + pragma Assert (Result = 0); + + SSL.Abort_Undefer.all; + + raise Program_Error; + else + -- Suspend the task if the state is False. Otherwise, the task + -- continues its execution, and the state of the suspension object + -- is set to False (ARM D.10 par. 9). + + if S.State then + S.State := False; + else + S.Waiting := True; + Result := pthread_cond_wait (S.CV'Access, S.L'Access); + end if; + + Result := pthread_mutex_unlock (S.L'Access); + pragma Assert (Result = 0); + + SSL.Abort_Undefer.all; + end if; + end Suspend_Until_True; + + ---------------- + -- Check_Exit -- + ---------------- + + -- Dummy version + + function Check_Exit (Self_ID : ST.Task_Id) return Boolean is + pragma Unreferenced (Self_ID); + begin + return True; + end Check_Exit; + + -------------------- + -- Check_No_Locks -- + -------------------- + + function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is + pragma Unreferenced (Self_ID); + begin + return True; + end Check_No_Locks; + + ---------------------- + -- Environment_Task -- + ---------------------- + + function Environment_Task return Task_Id is + begin + return Environment_Task_Id; + end Environment_Task; + + -------------- + -- Lock_RTS -- + -------------- + + procedure Lock_RTS is + begin + Write_Lock (Single_RTS_Lock'Access, Global_Lock => True); + end Lock_RTS; + + ---------------- + -- Unlock_RTS -- + ---------------- + + procedure Unlock_RTS is + begin + Unlock (Single_RTS_Lock'Access, Global_Lock => True); + end Unlock_RTS; + + ------------------ + -- Suspend_Task -- + ------------------ + + function Suspend_Task + (T : ST.Task_Id; + Thread_Self : Thread_Id) return Boolean + is + pragma Warnings (Off, T); + pragma Warnings (Off, 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 Warnings (Off, T); + pragma Warnings (Off, Thread_Self); + begin + return False; + end Resume_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; + + 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 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; + + Curpid := getpid; + + -- Initialize the lock used to synchronize chain of all ATCBs + + Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level); + + Specific.Initialize (Environment_Task); + + Enter_Task (Environment_Task); + + -- 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 (System.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; |