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author | Pierre-Marie de Rodat <pmderodat@gcc.gnu.org> | 2017-11-09 09:47:31 +0000 |
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committer | Pierre-Marie de Rodat <pmderodat@gcc.gnu.org> | 2017-11-09 09:47:31 +0000 |
commit | 6350cb2aa6949c355b407233766717c229ef623f (patch) | |
tree | 41a971c28f58dd598e13fe71d782797eb5b39ec9 /gcc/ada/libgnarl/s-taprop__qnx.adb | |
parent | 136ca74eb91c225ff18a7b08e0e7fd027b88517c (diff) | |
download | gcc-6350cb2aa6949c355b407233766717c229ef623f.zip gcc-6350cb2aa6949c355b407233766717c229ef623f.tar.gz gcc-6350cb2aa6949c355b407233766717c229ef623f.tar.bz2 |
[multiple changes]
2017-11-09 Piotr Trojanek <trojanek@adacore.com>
* lib-xref-spark_specific.adb (Add_SPARK_Xrefs): Ignore loop parameters
in expression funtions that are expanded into variables.
2017-11-09 Piotr Trojanek <trojanek@adacore.com>
* sem_util.adb: Minor whitespace cleanup.
2017-11-09 Jerome Lambourg <lambourg@adacore.com>
* libgnarl/s-taprop__qnx.adb: Refine aarch64-qnx. Use the POSIX
s-taprop version rather than a custom one.
* sigtramp-qnx.c (aarch64-qnx): Implement the signal trampoline.
From-SVN: r254563
Diffstat (limited to 'gcc/ada/libgnarl/s-taprop__qnx.adb')
-rw-r--r-- | gcc/ada/libgnarl/s-taprop__qnx.adb | 1546 |
1 files changed, 0 insertions, 1546 deletions
diff --git a/gcc/ada/libgnarl/s-taprop__qnx.adb b/gcc/ada/libgnarl/s-taprop__qnx.adb deleted file mode 100644 index 85ebed7..0000000 --- a/gcc/ada/libgnarl/s-taprop__qnx.adb +++ /dev/null @@ -1,1546 +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) 1992-2017, 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 QNX/Neutrino version of this package - --- This package contains all the GNULL primitives that interface directly with --- the underlying OS. - --- Note: this file can only be used for POSIX compliant systems that implement --- SCHED_FIFO and Ceiling Locking correctly. - --- For configurations where SCHED_FIFO and priority ceiling are not a --- requirement, this file can also be used (e.g AiX threads) - -pragma Polling (Off); --- Turn off polling, we do not want ATC polling to take place during tasking --- operations. It causes infinite loops and other problems. - -with Ada.Unchecked_Conversion; - -with Interfaces.C; - -with System.Tasking.Debug; -with System.Interrupt_Management; -with System.OS_Constants; -with System.OS_Primitives; -with System.Task_Info; - -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 OSC renames System.OS_Constants; - 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 - - 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"); - - Locking_Policy : Character; - pragma Import (C, Locking_Policy, "__gl_locking_policy"); - - Foreign_Task_Elaborated : aliased Boolean := True; - -- Used to identified fake tasks (i.e., non-Ada Threads) - - Use_Alternate_Stack : constant Boolean := Alternate_Stack_Size /= 0; - -- Whether to use an alternate signal stack for stack overflows - - Abort_Handler_Installed : Boolean := False; - -- True if a handler for the abort signal is installed - - -------------------- - -- Local Packages -- - -------------------- - - package Specific is - - procedure Initialize (Environment_Task : Task_Id); - pragma Inline (Initialize); - -- Initialize various data needed by this package - - function Is_Valid_Task return Boolean; - pragma Inline (Is_Valid_Task); - -- Does executing thread have a TCB? - - procedure Set (Self_Id : Task_Id); - pragma Inline (Set); - -- Set the self id for the current task - - function Self return Task_Id; - pragma Inline (Self); - -- Return a pointer to the Ada Task Control Block of the calling task - - end Specific; - - package body Specific is separate; - -- The body of this package is target specific - - ---------------------------------- - -- ATCB allocation/deallocation -- - ---------------------------------- - - package body ATCB_Allocation is separate; - -- The body of this package is shared across several targets - - --------------------------------- - -- Support for foreign threads -- - --------------------------------- - - function Register_Foreign_Thread - (Thread : Thread_Id; - Sec_Stack_Size : Size_Type := Unspecified_Size) return Task_Id; - -- Allocate and initialize a new ATCB for the current Thread. The size of - -- the secondary stack can be optionally specified. - - function Register_Foreign_Thread - (Thread : Thread_Id; - Sec_Stack_Size : Size_Type := Unspecified_Size) - return Task_Id is separate; - - ----------------------- - -- Local Subprograms -- - ----------------------- - - procedure Abort_Handler (Sig : Signal); - -- Signal handler used to implement asynchronous abort. - -- See also comment before body, below. - - function To_Address is - new Ada.Unchecked_Conversion (Task_Id, System.Address); - - function GNAT_pthread_condattr_setup - (attr : access pthread_condattr_t) return int; - pragma Import (C, - GNAT_pthread_condattr_setup, "__gnat_pthread_condattr_setup"); - - procedure Compute_Deadline - (Time : Duration; - Mode : ST.Delay_Modes; - Check_Time : out Duration; - Abs_Time : out Duration; - Rel_Time : out Duration); - -- Helper for Timed_Sleep and Timed_Delay: given a deadline specified by - -- Time and Mode, compute the current clock reading (Check_Time), and the - -- target absolute and relative clock readings (Abs_Time, Rel_Time). The - -- epoch for Time depends on Mode; the epoch for Check_Time and Abs_Time - -- is always that of CLOCK_RT_Ada. - - ------------------- - -- Abort_Handler -- - ------------------- - - -- Target-dependent binding of inter-thread Abort signal to the raising of - -- the Abort_Signal exception. - - -- The technical issues and alternatives here are essentially the - -- same as for raising exceptions in response to other signals - -- (e.g. Storage_Error). See code and comments in the package body - -- System.Interrupt_Management. - - -- Some implementations may not allow an exception to be propagated out of - -- a handler, and others might leave the signal or interrupt that invoked - -- this handler masked after the exceptional return to the application - -- code. - - -- GNAT exceptions are originally implemented using setjmp()/longjmp(). On - -- most UNIX systems, this will allow transfer out of a signal handler, - -- which is usually the only mechanism available for implementing - -- asynchronous handlers of this kind. However, some systems do not - -- restore the signal mask on longjmp(), leaving the abort signal masked. - - procedure Abort_Handler (Sig : Signal) is - pragma Unreferenced (Sig); - - T : constant Task_Id := Self; - Old_Set : aliased sigset_t; - - Result : Interfaces.C.int; - pragma Warnings (Off, Result); - - begin - -- It's not safe to raise an exception when using GCC ZCX mechanism. - -- Note that we still need to install a signal handler, since in some - -- cases (e.g. shutdown of the Server_Task in System.Interrupts) we - -- need to send the Abort signal to a task. - - if ZCX_By_Default 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'Access, Old_Set'Access); - pragma Assert (Result = 0); - - raise Standard'Abort_Signal; - end if; - end Abort_Handler; - - ---------------------- - -- Compute_Deadline -- - ---------------------- - - procedure Compute_Deadline - (Time : Duration; - Mode : ST.Delay_Modes; - Check_Time : out Duration; - Abs_Time : out Duration; - Rel_Time : out Duration) - is - begin - Check_Time := Monotonic_Clock; - - -- Relative deadline - - if Mode = Relative then - Abs_Time := Duration'Min (Time, Max_Sensible_Delay) + Check_Time; - - if Relative_Timed_Wait then - Rel_Time := Duration'Min (Max_Sensible_Delay, Time); - end if; - - pragma Warnings (Off); - -- Comparison "OSC.CLOCK_RT_Ada = OSC.CLOCK_REALTIME" is compile - -- time known. - - -- Absolute deadline specified using the tasking clock (CLOCK_RT_Ada) - - elsif Mode = Absolute_RT - or else OSC.CLOCK_RT_Ada = OSC.CLOCK_REALTIME - then - pragma Warnings (On); - Abs_Time := Duration'Min (Check_Time + Max_Sensible_Delay, Time); - - if Relative_Timed_Wait then - Rel_Time := Duration'Min (Max_Sensible_Delay, Time - Check_Time); - end if; - - -- Absolute deadline specified using the calendar clock, in the - -- case where it is not the same as the tasking clock: compensate for - -- difference between clock epochs (Base_Time - Base_Cal_Time). - - else - declare - Cal_Check_Time : constant Duration := OS_Primitives.Clock; - RT_Time : constant Duration := - Time + Check_Time - Cal_Check_Time; - - begin - Abs_Time := - Duration'Min (Check_Time + Max_Sensible_Delay, RT_Time); - - if Relative_Timed_Wait then - Rel_Time := - Duration'Min (Max_Sensible_Delay, RT_Time - Check_Time); - end if; - end; - end if; - end Compute_Deadline; - - ----------------- - -- Stack_Guard -- - ----------------- - - procedure Stack_Guard (T : ST.Task_Id; On : Boolean) is - Stack_Base : constant Address := Get_Stack_Base (T.Common.LL.Thread); - Page_Size : Address; - Res : Interfaces.C.int; - - begin - if Stack_Base_Available then - - -- Compute the guard page address - - Page_Size := Address (Get_Page_Size); - Res := - mprotect - (Stack_Base - (Stack_Base mod Page_Size) + Page_Size, - size_t (Page_Size), - prot => (if On then PROT_ON else PROT_OFF)); - pragma Assert (Res = 0); - end if; - end Stack_Guard; - - -------------------- - -- Get_Thread_Id -- - -------------------- - - function Get_Thread_Id (T : ST.Task_Id) return OSI.Thread_Id is - begin - return T.Common.LL.Thread; - end Get_Thread_Id; - - ---------- - -- Self -- - ---------- - - function Self return Task_Id renames Specific.Self; - - --------------------- - -- Initialize_Lock -- - --------------------- - - -- Note: mutexes and cond_variables needed per-task basis are initialized - -- in Initialize_TCB and the Storage_Error is handled. Other mutexes (such - -- as RTS_Lock, Memory_Lock...) used in RTS is initialized before any - -- status change of RTS. Therefore raising Storage_Error in the following - -- routines should be able to be handled safely. - - procedure Initialize_Lock - (Prio : System.Any_Priority; - L : not null access Lock) - is - Attributes : aliased pthread_mutexattr_t; - Result : Interfaces.C.int; - - begin - Result := pthread_mutexattr_init (Attributes'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = ENOMEM then - raise Storage_Error; - end if; - - if Locking_Policy = 'C' then - Result := pthread_mutexattr_setprotocol - (Attributes'Access, PTHREAD_PRIO_PROTECT); - pragma Assert (Result = 0); - - Result := pthread_mutexattr_setprioceiling - (Attributes'Access, Interfaces.C.int (Prio)); - pragma Assert (Result = 0); - - elsif Locking_Policy = 'I' then - Result := pthread_mutexattr_setprotocol - (Attributes'Access, PTHREAD_PRIO_INHERIT); - pragma Assert (Result = 0); - end if; - - Result := pthread_mutex_init (L.WO'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 : not null access RTS_Lock; Level : Lock_Level) - is - pragma Unreferenced (Level); - - Attributes : aliased pthread_mutexattr_t; - Result : Interfaces.C.int; - - begin - Result := pthread_mutexattr_init (Attributes'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = ENOMEM then - raise Storage_Error; - end if; - - if Locking_Policy = 'C' then - Result := pthread_mutexattr_setprotocol - (Attributes'Access, PTHREAD_PRIO_PROTECT); - pragma Assert (Result = 0); - - Result := pthread_mutexattr_setprioceiling - (Attributes'Access, Interfaces.C.int (System.Any_Priority'Last)); - pragma Assert (Result = 0); - - elsif Locking_Policy = 'I' then - Result := pthread_mutexattr_setprotocol - (Attributes'Access, PTHREAD_PRIO_INHERIT); - pragma Assert (Result = 0); - 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 : not null access Lock) is - Result : Interfaces.C.int; - begin - Result := pthread_mutex_destroy (L.WO'Access); - pragma Assert (Result = 0); - end Finalize_Lock; - - procedure Finalize_Lock (L : not null access RTS_Lock) is - Result : Interfaces.C.int; - begin - Result := pthread_mutex_destroy (L); - pragma Assert (Result = 0); - end Finalize_Lock; - - ---------------- - -- Write_Lock -- - ---------------- - - procedure Write_Lock - (L : not null access Lock; Ceiling_Violation : out Boolean) - is - Result : Interfaces.C.int; - - begin - Result := pthread_mutex_lock (L.WO'Access); - - -- The cause of EINVAL is a priority ceiling violation - - Ceiling_Violation := Result = EINVAL; - pragma Assert (Result = 0 or else Ceiling_Violation); - 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.WO'Access); - pragma Assert (Result = 0); - end Unlock; - - procedure Unlock - (L : not null access RTS_Lock; Global_Lock : Boolean := False) - is - Result : Interfaces.C.int; - begin - if not Single_Lock or else Global_Lock then - Result := pthread_mutex_unlock (L); - pragma Assert (Result = 0); - end if; - end Unlock; - - procedure Unlock (T : Task_Id) is - Result : Interfaces.C.int; - begin - if not Single_Lock then - Result := pthread_mutex_unlock (T.Common.LL.L'Access); - pragma Assert (Result = 0); - end if; - end Unlock; - - ----------------- - -- Set_Ceiling -- - ----------------- - - -- Dynamic priority ceilings are not supported by the underlying system - - procedure Set_Ceiling - (L : not null access Lock; - Prio : System.Any_Priority) - is - pragma Unreferenced (L, Prio); - begin - null; - end Set_Ceiling; - - ----------- - -- Sleep -- - ----------- - - procedure Sleep - (Self_ID : Task_Id; - Reason : System.Tasking.Task_States) - is - pragma Unreferenced (Reason); - - Result : Interfaces.C.int; - - begin - Result := - pthread_cond_wait - (cond => Self_ID.Common.LL.CV'Access, - mutex => (if Single_Lock - then Single_RTS_Lock'Access - else Self_ID.Common.LL.L'Access)); - - -- EINTR is not considered a failure - - pragma Assert (Result = 0 or else Result = EINTR); - 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 : Task_States; - Timedout : out Boolean; - Yielded : out Boolean) - is - pragma Unreferenced (Reason); - - Base_Time : Duration; - Check_Time : Duration; - Abs_Time : Duration; - Rel_Time : Duration; - - Request : aliased timespec; - Result : Interfaces.C.int; - - begin - Timedout := True; - Yielded := False; - - Compute_Deadline - (Time => Time, - Mode => Mode, - Check_Time => Check_Time, - Abs_Time => Abs_Time, - Rel_Time => Rel_Time); - Base_Time := Check_Time; - - if Abs_Time > Check_Time then - Request := - To_Timespec (if Relative_Timed_Wait then Rel_Time else Abs_Time); - - loop - exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level; - - Result := - pthread_cond_timedwait - (cond => Self_ID.Common.LL.CV'Access, - mutex => (if Single_Lock - then Single_RTS_Lock'Access - else Self_ID.Common.LL.L'Access), - abstime => Request'Access); - - Check_Time := Monotonic_Clock; - exit when Abs_Time <= Check_Time or else Check_Time < Base_Time; - - 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 - Base_Time : Duration; - Check_Time : Duration; - Abs_Time : Duration; - Rel_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); - - Compute_Deadline - (Time => Time, - Mode => Mode, - Check_Time => Check_Time, - Abs_Time => Abs_Time, - Rel_Time => Rel_Time); - Base_Time := Check_Time; - - if Abs_Time > Check_Time then - Request := - To_Timespec (if Relative_Timed_Wait then Rel_Time else Abs_Time); - Self_ID.Common.State := Delay_Sleep; - - loop - exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level; - - Result := - pthread_cond_timedwait - (cond => Self_ID.Common.LL.CV'Access, - mutex => (if Single_Lock - then Single_RTS_Lock'Access - else Self_ID.Common.LL.L'Access), - abstime => Request'Access); - - 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 - TS : aliased timespec; - Result : Interfaces.C.int; - begin - Result := clock_gettime - (clock_id => OSC.CLOCK_RT_Ada, tp => TS'Unchecked_Access); - pragma Assert (Result = 0); - return To_Duration (TS); - end Monotonic_Clock; - - ------------------- - -- RT_Resolution -- - ------------------- - - function RT_Resolution return Duration is - TS : aliased timespec; - Result : Interfaces.C.int; - begin - Result := clock_getres (OSC.CLOCK_REALTIME, TS'Unchecked_Access); - pragma Assert (Result = 0); - - return To_Duration (TS); - end RT_Resolution; - - ------------ - -- Wakeup -- - ------------ - - procedure Wakeup (T : Task_Id; Reason : System.Tasking.Task_States) is - pragma Unreferenced (Reason); - Result : Interfaces.C.int; - begin - Result := pthread_cond_signal (T.Common.LL.CV'Access); - pragma Assert (Result = 0); - end Wakeup; - - ----------- - -- Yield -- - ----------- - - procedure Yield (Do_Yield : Boolean := True) is - Result : Interfaces.C.int; - pragma Unreferenced (Result); - begin - if Do_Yield then - Result := sched_yield; - end if; - end Yield; - - ------------------ - -- Set_Priority -- - ------------------ - - procedure Set_Priority - (T : Task_Id; - Prio : System.Any_Priority; - Loss_Of_Inheritance : Boolean := False) - is - pragma Unreferenced (Loss_Of_Inheritance); - - Result : Interfaces.C.int; - Param : aliased struct_sched_param; - - function Get_Policy (Prio : System.Any_Priority) return Character; - pragma Import (C, Get_Policy, "__gnat_get_specific_dispatching"); - -- Get priority specific dispatching policy - - Priority_Specific_Policy : constant Character := Get_Policy (Prio); - -- Upper case first character of the policy name corresponding to the - -- task as set by a Priority_Specific_Dispatching pragma. - - begin - T.Common.Current_Priority := Prio; - Param.sched_priority := To_Target_Priority (Prio); - - if Time_Slice_Supported - and then (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 - Result := pthread_setschedparam - (T.Common.LL.Thread, SCHED_OTHER, Param'Access); - end if; - - pragma Assert (Result = 0); - end Set_Priority; - - ------------------ - -- Get_Priority -- - ------------------ - - function Get_Priority (T : Task_Id) return System.Any_Priority is - begin - return T.Common.Current_Priority; - end Get_Priority; - - ---------------- - -- Enter_Task -- - ---------------- - - procedure Enter_Task (Self_ID : Task_Id) is - begin - Self_ID.Common.LL.Thread := pthread_self; - Self_ID.Common.LL.LWP := lwp_self; - - Specific.Set (Self_ID); - - 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; - - ------------------- - -- 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 - -- 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); - - if not Single_Lock then - Result := pthread_mutexattr_init (Mutex_Attr'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = 0 then - if Locking_Policy = 'C' then - Result := - pthread_mutexattr_setprotocol - (Mutex_Attr'Access, - PTHREAD_PRIO_PROTECT); - pragma Assert (Result = 0); - - Result := - pthread_mutexattr_setprioceiling - (Mutex_Attr'Access, - Interfaces.C.int (System.Any_Priority'Last)); - pragma Assert (Result = 0); - - elsif Locking_Policy = 'I' then - Result := - pthread_mutexattr_setprotocol - (Mutex_Attr'Access, - PTHREAD_PRIO_INHERIT); - pragma Assert (Result = 0); - end if; - - 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 := GNAT_pthread_condattr_setup (Cond_Attr'Access); - pragma Assert (Result = 0); - - 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; - Page_Size : constant Interfaces.C.size_t := - Interfaces.C.size_t (Get_Page_Size); - Result : Interfaces.C.int; - - function Thread_Body_Access is new - Ada.Unchecked_Conversion (System.Address, Thread_Body); - - use System.Task_Info; - - begin - Adjusted_Stack_Size := - Interfaces.C.size_t (Stack_Size + Alternate_Stack_Size); - - if Stack_Base_Available then - - -- If Stack Checking is supported then allocate 2 additional pages: - - -- In the worst case, stack is allocated at something like - -- N * Get_Page_Size - epsilon, we need to add the size for 2 pages - -- to be sure the effective stack size is greater than what - -- has been asked. - - Adjusted_Stack_Size := Adjusted_Stack_Size + 2 * Page_Size; - end if; - - -- Round stack size as this is required by some OSes (Darwin) - - Adjusted_Stack_Size := Adjusted_Stack_Size + Page_Size - 1; - Adjusted_Stack_Size := - Adjusted_Stack_Size - Adjusted_Stack_Size mod 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); - - if T.Common.Task_Info /= Default_Scope then - case T.Common.Task_Info 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. - - -- Note: the use of Unrestricted_Access in the following call is needed - -- because otherwise we have an error of getting a access-to-volatile - -- value which points to a non-volatile object. But in this case it is - -- safe to do this, since we know we have no problems with aliasing and - -- Unrestricted_Access bypasses this check. - - Result := pthread_create - (T.Common.LL.Thread'Unrestricted_Access, - Attributes'Access, - Thread_Body_Access (Wrapper), - To_Address (T)); - pragma Assert (Result = 0 or else Result = EAGAIN); - - Succeeded := Result = 0; - - Result := pthread_attr_destroy (Attributes'Access); - pragma Assert (Result = 0); - - if Succeeded then - Set_Priority (T, Priority); - end if; - end Create_Task; - - ------------------ - -- Finalize_TCB -- - ------------------ - - procedure Finalize_TCB (T : Task_Id) is - Result : Interfaces.C.int; - - begin - if not Single_Lock then - Result := pthread_mutex_destroy (T.Common.LL.L'Access); - pragma Assert (Result = 0); - end if; - - Result := pthread_cond_destroy (T.Common.LL.CV'Access); - pragma Assert (Result = 0); - - if T.Known_Tasks_Index /= -1 then - Known_Tasks (T.Known_Tasks_Index) := null; - end if; - - ATCB_Allocation.Free_ATCB (T); - end Finalize_TCB; - - --------------- - -- Exit_Task -- - --------------- - - procedure Exit_Task is - begin - -- Mark this task as unknown, so that if Self is called, it won't - -- return a dangling pointer. - - Specific.Set (null); - end Exit_Task; - - ---------------- - -- Abort_Task -- - ---------------- - - procedure Abort_Task (T : Task_Id) is - Result : Interfaces.C.int; - begin - if Abort_Handler_Installed then - Result := - pthread_kill - (T.Common.LL.Thread, - Signal (System.Interrupt_Management.Abort_Task_Interrupt)); - pragma Assert (Result = 0); - end if; - end Abort_Task; - - ---------------- - -- Initialize -- - ---------------- - - procedure Initialize (S : in out Suspension_Object) is - Mutex_Attr : aliased pthread_mutexattr_t; - Cond_Attr : aliased pthread_condattr_t; - Result : Interfaces.C.int; - - begin - -- Initialize internal state (always to False (RM D.10 (6))) - - S.State := False; - S.Waiting := False; - - -- Initialize internal mutex - - Result := pthread_mutexattr_init (Mutex_Attr'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = ENOMEM then - raise Storage_Error; - end if; - - Result := pthread_mutex_init (S.L'Access, Mutex_Attr'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = ENOMEM then - Result := pthread_mutexattr_destroy (Mutex_Attr'Access); - pragma Assert (Result = 0); - - raise Storage_Error; - end if; - - Result := pthread_mutexattr_destroy (Mutex_Attr'Access); - pragma Assert (Result = 0); - - -- Initialize internal condition variable - - Result := pthread_condattr_init (Cond_Attr'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result /= 0 then - Result := pthread_mutex_destroy (S.L'Access); - pragma Assert (Result = 0); - - -- Storage_Error is propagated as intended if the allocation of the - -- underlying OS entities fails. - - raise Storage_Error; - - else - Result := GNAT_pthread_condattr_setup (Cond_Attr'Access); - pragma Assert (Result = 0); - end if; - - Result := pthread_cond_init (S.CV'Access, Cond_Attr'Access); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result /= 0 then - Result := pthread_mutex_destroy (S.L'Access); - pragma Assert (Result = 0); - - Result := pthread_condattr_destroy (Cond_Attr'Access); - pragma Assert (Result = 0); - - -- Storage_Error is propagated as intended if the allocation of the - -- underlying OS entities fails. - - raise Storage_Error; - end if; - - Result := pthread_condattr_destroy (Cond_Attr'Access); - pragma Assert (Result = 0); - end Initialize; - - -------------- - -- Finalize -- - -------------- - - procedure Finalize (S : in out Suspension_Object) is - Result : Interfaces.C.int; - - begin - -- Destroy internal mutex - - Result := pthread_mutex_destroy (S.L'Access); - pragma Assert (Result = 0); - - -- Destroy internal condition variable - - Result := pthread_cond_destroy (S.CV'Access); - pragma Assert (Result = 0); - end Finalize; - - ------------------- - -- Current_State -- - ------------------- - - function Current_State (S : Suspension_Object) return Boolean is - begin - -- We do not want to use lock on this read operation. State is marked - -- as Atomic so that we ensure that the value retrieved is correct. - - return S.State; - end Current_State; - - --------------- - -- Set_False -- - --------------- - - procedure Set_False (S : in out Suspension_Object) is - Result : Interfaces.C.int; - - begin - SSL.Abort_Defer.all; - - Result := pthread_mutex_lock (S.L'Access); - pragma Assert (Result = 0); - - S.State := False; - - Result := pthread_mutex_unlock (S.L'Access); - pragma Assert (Result = 0); - - SSL.Abort_Undefer.all; - end Set_False; - - -------------- - -- Set_True -- - -------------- - - procedure Set_True (S : in out Suspension_Object) is - Result : Interfaces.C.int; - - begin - SSL.Abort_Defer.all; - - Result := pthread_mutex_lock (S.L'Access); - pragma Assert (Result = 0); - - -- If there is already a task waiting on this suspension object then - -- we resume it, leaving the state of the suspension object to False, - -- as it is specified in (RM D.10(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; - - loop - -- Loop in case pthread_cond_wait returns earlier than expected - -- (e.g. in case of EINTR caused by a signal). - - Result := pthread_cond_wait (S.CV'Access, S.L'Access); - pragma Assert (Result = 0 or else Result = EINTR); - - exit when not S.Waiting; - end loop; - end if; - - Result := pthread_mutex_unlock (S.L'Access); - pragma Assert (Result = 0); - - SSL.Abort_Undefer.all; - end if; - end Suspend_Until_True; - - ---------------- - -- Check_Exit -- - ---------------- - - -- Dummy version - - function Check_Exit (Self_ID : ST.Task_Id) return Boolean is - pragma Unreferenced (Self_ID); - begin - return True; - end Check_Exit; - - -------------------- - -- Check_No_Locks -- - -------------------- - - function Check_No_Locks (Self_ID : ST.Task_Id) return Boolean is - pragma Unreferenced (Self_ID); - begin - return True; - end Check_No_Locks; - - ---------------------- - -- Environment_Task -- - ---------------------- - - function Environment_Task return Task_Id is - begin - return Environment_Task_Id; - end Environment_Task; - - -------------- - -- Lock_RTS -- - -------------- - - procedure Lock_RTS is - begin - Write_Lock (Single_RTS_Lock'Access, Global_Lock => True); - end Lock_RTS; - - ---------------- - -- Unlock_RTS -- - ---------------- - - procedure Unlock_RTS is - begin - Unlock (Single_RTS_Lock'Access, Global_Lock => True); - end Unlock_RTS; - - ------------------ - -- Suspend_Task -- - ------------------ - - function Suspend_Task - (T : ST.Task_Id; - Thread_Self : Thread_Id) return Boolean - is - 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; - - 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; - - -- Initialize the lock used to synchronize chain of all ATCBs - - Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level); - - Specific.Initialize (Environment_Task); - - if Use_Alternate_Stack then - Environment_Task.Common.Task_Alternate_Stack := - Alternate_Stack'Address; - end if; - - -- Make environment task known here because it doesn't go through - -- Activate_Tasks, which does it for all other tasks. - - Known_Tasks (Known_Tasks'First) := Environment_Task; - Environment_Task.Known_Tasks_Index := Known_Tasks'First; - - Enter_Task (Environment_Task); - - 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); - Abort_Handler_Installed := True; - end if; - end Initialize; - - ----------------------- - -- Set_Task_Affinity -- - ----------------------- - - procedure Set_Task_Affinity (T : ST.Task_Id) is - pragma Unreferenced (T); - - begin - -- Setting task affinity is not supported by the underlying system - - null; - end Set_Task_Affinity; - -end System.Task_Primitives.Operations; |