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Diffstat (limited to 'gcc-4.4.3/gcc/ada/s-taprop-solaris.adb')
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1 files changed, 0 insertions, 1965 deletions
diff --git a/gcc-4.4.3/gcc/ada/s-taprop-solaris.adb b/gcc-4.4.3/gcc/ada/s-taprop-solaris.adb deleted file mode 100644 index 16da81c44..000000000 --- a/gcc-4.4.3/gcc/ada/s-taprop-solaris.adb +++ /dev/null @@ -1,1965 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- --- -- --- S Y S T E M . T A S K _ P R I M I T I V E S . O P E R A T I O N S -- --- -- --- B o d y -- --- -- --- Copyright (C) 1992-2009, Free Software Foundation, Inc. -- --- -- --- GNARL is free software; you can redistribute it and/or modify it under -- --- terms of the GNU General Public License as published by the Free Soft- -- --- ware Foundation; either version 3, or (at your option) any later ver- -- --- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- --- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- --- or FITNESS FOR A PARTICULAR PURPOSE. -- --- -- --- As a special exception under Section 7 of GPL version 3, you are granted -- --- additional permissions described in the GCC Runtime Library Exception, -- --- version 3.1, as published by the Free Software Foundation. -- --- -- --- You should have received a copy of the GNU General Public License and -- --- a copy of the GCC Runtime Library Exception along with this program; -- --- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- --- <http://www.gnu.org/licenses/>. -- --- -- --- GNARL was developed by the GNARL team at Florida State University. -- --- Extensive contributions were provided by Ada Core Technologies, Inc. -- --- -- ------------------------------------------------------------------------------- - --- This is a Solaris (native) 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_Deallocation; - -with Interfaces.C; - -with System.Tasking.Debug; -with System.Interrupt_Management; -with System.OS_Primitives; -with System.Task_Info; - -pragma Warnings (Off); -with System.OS_Lib; -pragma Warnings (On); - -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; - - use System.Tasking.Debug; - use System.Tasking; - use Interfaces.C; - use System.OS_Interface; - use System.Parameters; - use System.OS_Primitives; - - ---------------- - -- Local Data -- - ---------------- - - -- The following are logically constants, but need to be initialized - -- at run time. - - Environment_Task_Id : Task_Id; - -- A variable to hold Task_Id for the environment task. - -- If we use this variable to get the Task_Id, we need the following - -- ATCB_Key only for non-Ada threads. - - Unblocked_Signal_Mask : aliased sigset_t; - -- The set of signals that should unblocked in all tasks - - ATCB_Key : aliased thread_key_t; - -- Key used to find the Ada Task_Id associated with a thread, - -- at least for C threads unknown to the Ada run-time system. - - 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 - - Next_Serial_Number : Task_Serial_Number := 100; - -- We start at 100, to reserve some special values for - -- using in error checking. - -- The following are internal configuration constants needed. - - ---------------------- - -- Priority Support -- - ---------------------- - - Priority_Ceiling_Emulation : constant Boolean := True; - -- controls whether we emulate priority ceiling locking - - -- To get a scheduling close to annex D requirements, we use the real-time - -- class provided for LWPs and map each task/thread to a specific and - -- unique LWP (there is 1 thread per LWP, and 1 LWP per thread). - - -- The real time class can only be set when the process has root - -- privileges, so in the other cases, we use the normal thread scheduling - -- and priority handling. - - Using_Real_Time_Class : Boolean := False; - -- indicates whether the real time class is being used (i.e. the process - -- has root privileges). - - Prio_Param : aliased struct_pcparms; - -- Hold priority info (Real_Time) initialized during the package - -- elaboration. - - ----------------------------------- - -- External Configuration Values -- - ----------------------------------- - - 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"); - - Foreign_Task_Elaborated : aliased Boolean := True; - -- Used to identified fake tasks (i.e., non-Ada Threads) - - ----------------------- - -- Local Subprograms -- - ----------------------- - - function sysconf (name : System.OS_Interface.int) return processorid_t; - pragma Import (C, sysconf, "sysconf"); - - SC_NPROCESSORS_CONF : constant System.OS_Interface.int := 14; - - function Num_Procs - (name : System.OS_Interface.int := SC_NPROCESSORS_CONF) - return processorid_t renames sysconf; - - procedure Abort_Handler - (Sig : Signal; - Code : not null access siginfo_t; - Context : not null access ucontext_t); - -- Target-dependent binding of inter-thread Abort signal to - -- the raising of the Abort_Signal exception. - -- See also comments in 7staprop.adb - - ------------ - -- Checks -- - ------------ - - function Check_Initialize_Lock - (L : Lock_Ptr; - Level : Lock_Level) return Boolean; - pragma Inline (Check_Initialize_Lock); - - function Check_Lock (L : Lock_Ptr) return Boolean; - pragma Inline (Check_Lock); - - function Record_Lock (L : Lock_Ptr) return Boolean; - pragma Inline (Record_Lock); - - function Check_Sleep (Reason : Task_States) return Boolean; - pragma Inline (Check_Sleep); - - function Record_Wakeup - (L : Lock_Ptr; - Reason : Task_States) return Boolean; - pragma Inline (Record_Wakeup); - - function Check_Wakeup - (T : Task_Id; - Reason : Task_States) return Boolean; - pragma Inline (Check_Wakeup); - - function Check_Unlock (L : Lock_Ptr) return Boolean; - pragma Inline (Check_Unlock); - - function Check_Finalize_Lock (L : Lock_Ptr) return Boolean; - pragma Inline (Check_Finalize_Lock); - - -------------------- - -- 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; - - ------------ - -- Checks -- - ------------ - - Check_Count : Integer := 0; - Lock_Count : Integer := 0; - Unlock_Count : Integer := 0; - - ------------------- - -- Abort_Handler -- - ------------------- - - procedure Abort_Handler - (Sig : Signal; - Code : not null access siginfo_t; - Context : not null access ucontext_t) - is - pragma Unreferenced (Sig); - pragma Unreferenced (Code); - pragma Unreferenced (Context); - - Self_ID : constant Task_Id := Self; - Old_Set : aliased sigset_t; - - Result : Interfaces.C.int; - pragma Warnings (Off, Result); - - begin - -- It is not safe to raise an exception when using ZCX and the GCC - -- exception handling mechanism. - - if ZCX_By_Default and then GCC_ZCX_Support then - return; - end if; - - if Self_ID.Deferral_Level = 0 - and then Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level - and then not Self_ID.Aborting - then - Self_ID.Aborting := True; - - -- Make sure signals used for RTS internal purpose are unmasked - - Result := - thr_sigsetmask - (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; - - ---------------- - -- Initialize -- - ---------------- - - procedure Initialize (Environment_Task : ST.Task_Id) is - act : aliased struct_sigaction; - old_act : aliased struct_sigaction; - Tmp_Set : aliased sigset_t; - Result : Interfaces.C.int; - - procedure Configure_Processors; - -- Processors configuration - -- The user can specify a processor which the program should run - -- on to emulate a single-processor system. This can be easily - -- done by setting environment variable GNAT_PROCESSOR to one of - -- the following : - -- - -- -2 : use the default configuration (run the program on all - -- available processors) - this is the same as having - -- GNAT_PROCESSOR unset - -- -1 : let the RTS choose one processor and run the program on - -- that processor - -- 0 .. Last_Proc : run the program on the specified processor - -- - -- Last_Proc is equal to the value of the system variable - -- _SC_NPROCESSORS_CONF, minus one. - - procedure Configure_Processors is - Proc_Acc : constant System.OS_Lib.String_Access := - System.OS_Lib.Getenv ("GNAT_PROCESSOR"); - Proc : aliased processorid_t; -- User processor # - Last_Proc : processorid_t; -- Last processor # - - begin - if Proc_Acc.all'Length /= 0 then - - -- Environment variable is defined - - Last_Proc := Num_Procs - 1; - - if Last_Proc /= -1 then - Proc := processorid_t'Value (Proc_Acc.all); - - if Proc <= -2 or else Proc > Last_Proc then - - -- Use the default configuration - - null; - - elsif Proc = -1 then - - -- Choose a processor - - Result := 0; - while Proc < Last_Proc loop - Proc := Proc + 1; - Result := p_online (Proc, PR_STATUS); - exit when Result = PR_ONLINE; - end loop; - - pragma Assert (Result = PR_ONLINE); - Result := processor_bind (P_PID, P_MYID, Proc, null); - pragma Assert (Result = 0); - - else - -- Use user processor - - Result := processor_bind (P_PID, P_MYID, Proc, null); - pragma Assert (Result = 0); - end if; - end if; - end if; - - exception - when Constraint_Error => - - -- Illegal environment variable GNAT_PROCESSOR - ignored - - null; - end Configure_Processors; - - 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) - - -- Start of processing for Initialize - - 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; - - if Dispatching_Policy = 'F' then - declare - Result : Interfaces.C.long; - Class_Info : aliased struct_pcinfo; - Secs, Nsecs : Interfaces.C.long; - - begin - -- If a pragma Time_Slice is specified, takes the value in account - - if Time_Slice_Val > 0 then - - -- Convert Time_Slice_Val (microseconds) to seconds/nanosecs - - Secs := Interfaces.C.long (Time_Slice_Val / 1_000_000); - Nsecs := - Interfaces.C.long ((Time_Slice_Val rem 1_000_000) * 1_000); - - -- Otherwise, default to no time slicing (i.e run until blocked) - - else - Secs := RT_TQINF; - Nsecs := RT_TQINF; - end if; - - -- Get the real time class id - - Class_Info.pc_clname (1) := 'R'; - Class_Info.pc_clname (2) := 'T'; - Class_Info.pc_clname (3) := ASCII.NUL; - - Result := priocntl (PC_VERSION, P_LWPID, P_MYID, PC_GETCID, - Class_Info'Address); - - -- Request the real time class - - Prio_Param.pc_cid := Class_Info.pc_cid; - Prio_Param.rt_pri := pri_t (Class_Info.rt_maxpri); - Prio_Param.rt_tqsecs := Secs; - Prio_Param.rt_tqnsecs := Nsecs; - - Result := - priocntl - (PC_VERSION, P_LWPID, P_MYID, PC_SETPARMS, Prio_Param'Address); - - Using_Real_Time_Class := Result /= -1; - end; - end if; - - Specific.Initialize (Environment_Task); - - -- The following is done in Enter_Task, but this is too late for the - -- Environment Task, since we need to call Self in Check_Locks when - -- the run time is compiled with assertions on. - - Specific.Set (Environment_Task); - - -- Initialize the lock used to synchronize chain of all ATCBs - - Initialize_Lock (Single_RTS_Lock'Access, RTS_Lock_Level); - - Enter_Task (Environment_Task); - - -- Install the abort-signal handler - - if State - (System.Interrupt_Management.Abort_Task_Interrupt) /= Default - then - -- Set sa_flags to SA_NODEFER so that during the handler execution - -- we do not change the Signal_Mask to be masked for the Abort_Signal - -- This is a temporary fix to the problem that the Signal_Mask is - -- not restored after the exception (longjmp) from the handler. - -- The right fix should be made in sigsetjmp so that we save - -- the Signal_Set and restore it after a longjmp. - -- In that case, this field should be changed back to 0. ??? - - act.sa_flags := 16; - - 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; - - Configure_Processors; - end Initialize; - - --------------------- - -- 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 - Result : Interfaces.C.int; - - begin - pragma Assert (Check_Initialize_Lock (Lock_Ptr (L), PO_Level)); - - if Priority_Ceiling_Emulation then - L.Ceiling := Prio; - end if; - - Result := mutex_init (L.L'Access, USYNC_THREAD, System.Null_Address); - 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 - Result : Interfaces.C.int; - - begin - pragma Assert - (Check_Initialize_Lock (To_Lock_Ptr (RTS_Lock_Ptr (L)), Level)); - Result := mutex_init (L.L'Access, USYNC_THREAD, System.Null_Address); - 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; - - ------------------- - -- Finalize_Lock -- - ------------------- - - procedure Finalize_Lock (L : not null access Lock) is - Result : Interfaces.C.int; - begin - pragma Assert (Check_Finalize_Lock (Lock_Ptr (L))); - Result := mutex_destroy (L.L'Access); - pragma Assert (Result = 0); - end Finalize_Lock; - - procedure Finalize_Lock (L : not null access RTS_Lock) is - Result : Interfaces.C.int; - begin - pragma Assert (Check_Finalize_Lock (To_Lock_Ptr (RTS_Lock_Ptr (L)))); - Result := mutex_destroy (L.L'Access); - 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 - pragma Assert (Check_Lock (Lock_Ptr (L))); - - if Priority_Ceiling_Emulation and then Locking_Policy = 'C' then - declare - Self_Id : constant Task_Id := Self; - Saved_Priority : System.Any_Priority; - - begin - if Self_Id.Common.LL.Active_Priority > L.Ceiling then - Ceiling_Violation := True; - return; - end if; - - Saved_Priority := Self_Id.Common.LL.Active_Priority; - - if Self_Id.Common.LL.Active_Priority < L.Ceiling then - Set_Priority (Self_Id, L.Ceiling); - end if; - - Result := mutex_lock (L.L'Access); - pragma Assert (Result = 0); - Ceiling_Violation := False; - - L.Saved_Priority := Saved_Priority; - end; - - else - Result := mutex_lock (L.L'Access); - pragma Assert (Result = 0); - Ceiling_Violation := False; - end if; - - pragma Assert (Record_Lock (Lock_Ptr (L))); - 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 - pragma Assert (Check_Lock (To_Lock_Ptr (RTS_Lock_Ptr (L)))); - Result := mutex_lock (L.L'Access); - pragma Assert (Result = 0); - pragma Assert (Record_Lock (To_Lock_Ptr (RTS_Lock_Ptr (L)))); - end if; - end Write_Lock; - - procedure Write_Lock (T : Task_Id) is - Result : Interfaces.C.int; - begin - if not Single_Lock then - pragma Assert (Check_Lock (To_Lock_Ptr (T.Common.LL.L'Access))); - Result := mutex_lock (T.Common.LL.L.L'Access); - pragma Assert (Result = 0); - pragma Assert (Record_Lock (To_Lock_Ptr (T.Common.LL.L'Access))); - 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 - pragma Assert (Check_Unlock (Lock_Ptr (L))); - - if Priority_Ceiling_Emulation and then Locking_Policy = 'C' then - declare - Self_Id : constant Task_Id := Self; - - begin - Result := mutex_unlock (L.L'Access); - pragma Assert (Result = 0); - - if Self_Id.Common.LL.Active_Priority > L.Saved_Priority then - Set_Priority (Self_Id, L.Saved_Priority); - end if; - end; - else - Result := mutex_unlock (L.L'Access); - pragma Assert (Result = 0); - end if; - 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 - pragma Assert (Check_Unlock (To_Lock_Ptr (RTS_Lock_Ptr (L)))); - Result := mutex_unlock (L.L'Access); - pragma Assert (Result = 0); - end if; - end Unlock; - - procedure Unlock (T : Task_Id) is - Result : Interfaces.C.int; - begin - if not Single_Lock then - pragma Assert (Check_Unlock (To_Lock_Ptr (T.Common.LL.L'Access))); - Result := mutex_unlock (T.Common.LL.L.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; - - -- For the time delay implementation, we need to make sure we - -- achieve following criteria: - - -- 1) We have to delay at least for the amount requested. - -- 2) We have to give up CPU even though the actual delay does not - -- result in blocking. - -- 3) Except for restricted run-time systems that do not support - -- ATC or task abort, the delay must be interrupted by the - -- abort_task operation. - -- 4) The implementation has to be efficient so that the delay overhead - -- is relatively cheap. - -- (1)-(3) are Ada requirements. Even though (2) is an Annex-D - -- requirement we still want to provide the effect in all cases. - -- The reason is that users may want to use short delays to implement - -- their own scheduling effect in the absence of language provided - -- scheduling policies. - - --------------------- - -- 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 - return 10#1.0#E-6; - end RT_Resolution; - - ----------- - -- Yield -- - ----------- - - procedure Yield (Do_Yield : Boolean := True) is - begin - if Do_Yield then - System.OS_Interface.thr_yield; - end if; - end Yield; - - ----------- - -- Self --- - ----------- - - function Self return Task_Id renames Specific.Self; - - ------------------ - -- 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; - pragma Unreferenced (Result); - - Param : aliased struct_pcparms; - - use Task_Info; - - begin - T.Common.Current_Priority := Prio; - - if Priority_Ceiling_Emulation then - T.Common.LL.Active_Priority := Prio; - end if; - - if Using_Real_Time_Class then - Param.pc_cid := Prio_Param.pc_cid; - Param.rt_pri := pri_t (Prio); - Param.rt_tqsecs := Prio_Param.rt_tqsecs; - Param.rt_tqnsecs := Prio_Param.rt_tqnsecs; - - Result := Interfaces.C.int ( - priocntl (PC_VERSION, P_LWPID, T.Common.LL.LWP, PC_SETPARMS, - Param'Address)); - - else - if T.Common.Task_Info /= null - and then not T.Common.Task_Info.Bound_To_LWP - then - -- The task is not bound to a LWP, so use thr_setprio - - Result := - thr_setprio (T.Common.LL.Thread, Interfaces.C.int (Prio)); - - else - -- The task is bound to a LWP, use priocntl - -- ??? TBD - - null; - end if; - end if; - 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 - Result : Interfaces.C.int; - Proc : processorid_t; -- User processor # - Last_Proc : processorid_t; -- Last processor # - - use System.Task_Info; - begin - Self_ID.Common.LL.Thread := thr_self; - - Self_ID.Common.LL.LWP := lwp_self; - - if Self_ID.Common.Task_Info /= null then - if Self_ID.Common.Task_Info.New_LWP - and then Self_ID.Common.Task_Info.CPU /= CPU_UNCHANGED - then - Last_Proc := Num_Procs - 1; - - if Self_ID.Common.Task_Info.CPU = ANY_CPU then - Result := 0; - Proc := 0; - while Proc < Last_Proc loop - Result := p_online (Proc, PR_STATUS); - exit when Result = PR_ONLINE; - Proc := Proc + 1; - end loop; - - Result := processor_bind (P_LWPID, P_MYID, Proc, null); - pragma Assert (Result = 0); - - else - -- Use specified processor - - if Self_ID.Common.Task_Info.CPU < 0 - or else Self_ID.Common.Task_Info.CPU > Last_Proc - then - raise Invalid_CPU_Number; - end if; - - Result := - processor_bind - (P_LWPID, P_MYID, Self_ID.Common.Task_Info.CPU, null); - pragma Assert (Result = 0); - end if; - end if; - end if; - - Specific.Set (Self_ID); - - -- We need the above code even if we do direct fetch of Task_Id in Self - -- for the main task on Sun, x86 Solaris and for gcc 2.7.2. - - 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 (thr_self); - end if; - end Register_Foreign_Thread; - - -------------------- - -- Initialize_TCB -- - -------------------- - - procedure Initialize_TCB (Self_ID : Task_Id; Succeeded : out Boolean) is - Result : Interfaces.C.int := 0; - - 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_thread_t (-1); - - if not Single_Lock then - Result := - mutex_init - (Self_ID.Common.LL.L.L'Access, USYNC_THREAD, System.Null_Address); - Self_ID.Common.LL.L.Level := - Private_Task_Serial_Number (Self_ID.Serial_Number); - pragma Assert (Result = 0 or else Result = ENOMEM); - end if; - - if Result = 0 then - Result := cond_init (Self_ID.Common.LL.CV'Access, USYNC_THREAD, 0); - pragma Assert (Result = 0 or else Result = ENOMEM); - end if; - - if Result = 0 then - Succeeded := True; - else - if not Single_Lock then - Result := mutex_destroy (Self_ID.Common.LL.L.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 - pragma Unreferenced (Priority); - - Result : Interfaces.C.int; - Adjusted_Stack_Size : Interfaces.C.size_t; - Opts : Interfaces.C.int := THR_DETACHED; - - Page_Size : constant System.Parameters.Size_Type := 4096; - -- This constant is for reserving extra space at the - -- end of the stack, which can be used by the stack - -- checking as guard page. The idea is that we need - -- to have at least Stack_Size bytes available for - -- actual use. - - use System.Task_Info; - - begin - Adjusted_Stack_Size := Interfaces.C.size_t (Stack_Size + Page_Size); - - -- 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. - - if T.Common.Task_Info /= null then - if T.Common.Task_Info.New_LWP then - Opts := Opts + THR_NEW_LWP; - end if; - - if T.Common.Task_Info.Bound_To_LWP then - Opts := Opts + THR_BOUND; - end if; - - else - Opts := THR_DETACHED + THR_BOUND; - end if; - - Result := - thr_create - (System.Null_Address, - Adjusted_Stack_Size, - Thread_Body_Access (Wrapper), - To_Address (T), - Opts, - T.Common.LL.Thread'Access); - - Succeeded := Result = 0; - pragma Assert - (Result = 0 - or else Result = ENOMEM - or else Result = EAGAIN); - 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 - T.Common.LL.Thread := To_thread_t (0); - - if not Single_Lock then - Result := mutex_destroy (T.Common.LL.L.L'Access); - pragma Assert (Result = 0); - end if; - - Result := 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 -- - --------------- - - -- This procedure must be called with abort deferred. It can no longer - -- call Self or access the current task's ATCB, since the ATCB has been - -- deallocated. - - 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 - pragma Assert (T /= Self); - Result := - thr_kill - (T.Common.LL.Thread, - Signal (System.Interrupt_Management.Abort_Task_Interrupt)); - pragma Assert (Result = 0); - end Abort_Task; - - ----------- - -- Sleep -- - ----------- - - procedure Sleep - (Self_ID : Task_Id; - Reason : Task_States) - is - Result : Interfaces.C.int; - - begin - pragma Assert (Check_Sleep (Reason)); - - if Single_Lock then - Result := - cond_wait - (Self_ID.Common.LL.CV'Access, Single_RTS_Lock.L'Access); - else - Result := - cond_wait - (Self_ID.Common.LL.CV'Access, Self_ID.Common.LL.L.L'Access); - end if; - - pragma Assert - (Record_Wakeup (To_Lock_Ptr (Self_ID.Common.LL.L'Access), Reason)); - pragma Assert (Result = 0 or else Result = EINTR); - end Sleep; - - -- Note that we are relying heavily here on GNAT representing - -- Calendar.Time, System.Real_Time.Time, Duration, - -- System.Real_Time.Time_Span in the same way, i.e., as a 64-bit count of - -- nanoseconds. - - -- This allows us to always pass the timeout value as a Duration. - - -- ??? - -- We are taking liberties here with the semantics of the delays. That is, - -- we make no distinction between delays on the Calendar clock and delays - -- on the Real_Time clock. That is technically incorrect, if the Calendar - -- clock happens to be reset or adjusted. To solve this defect will require - -- modification to the compiler interface, so that it can pass through more - -- information, to tell us here which clock to use! - - -- cond_timedwait will return if any of the following happens: - -- 1) some other task did cond_signal on this condition variable - -- In this case, the return value is 0 - -- 2) the call just returned, for no good reason - -- This is called a "spurious wakeup". - -- In this case, the return value may also be 0. - -- 3) the time delay expires - -- In this case, the return value is ETIME - -- 4) this task received a signal, which was handled by some - -- handler procedure, and now the thread is resuming execution - -- UNIX calls this an "interrupted" system call. - -- In this case, the return value is EINTR - - -- If the cond_timedwait returns 0 or EINTR, it is still possible that the - -- time has actually expired, and by chance a signal or cond_signal - -- occurred at around the same time. - - -- We have also observed that on some OS's the value ETIME will be - -- returned, but the clock will show that the full delay has not yet - -- expired. - - -- For these reasons, we need to check the clock after return from - -- cond_timedwait. If the time has expired, we will set Timedout = True. - - -- This check might be omitted for systems on which the cond_timedwait() - -- never returns early or wakes up spuriously. - - -- Annex D requires that completion of a delay cause the task to go to the - -- end of its priority queue, regardless of whether the task actually was - -- suspended by the delay. Since cond_timedwait does not do this on - -- Solaris, we add a call to thr_yield at the end. We might do this at the - -- beginning, instead, but then the round-robin effect would not be the - -- same; the delayed task would be ahead of other tasks of the same - -- priority that awoke while it was sleeping. - - -- For Timed_Sleep, we are expecting possible cond_signals to indicate - -- other events (e.g., completion of a RV or completion of the abortable - -- part of an async. select), we want to always return if interrupted. The - -- caller will be responsible for checking the task state to see whether - -- the wakeup was spurious, and to go back to sleep again in that case. We - -- don't need to check for pending abort or priority change on the way in - -- our out; that is the caller's responsibility. - - -- For Timed_Delay, we are not expecting any cond_signals or other - -- interruptions, except for priority changes and aborts. Therefore, we - -- don't want to return unless the delay has actually expired, or the call - -- has been aborted. In this case, since we want to implement the entire - -- delay statement semantics, we do need to check for pending abort and - -- priority changes. We can quietly handle priority changes inside the - -- procedure, since there is no entry-queue reordering involved. - - ----------------- - -- Timed_Sleep -- - ----------------- - - procedure Timed_Sleep - (Self_ID : Task_Id; - Time : Duration; - Mode : ST.Delay_Modes; - Reason : System.Tasking.Task_States; - Timedout : out Boolean; - Yielded : out Boolean) - is - Base_Time : constant Duration := Monotonic_Clock; - Check_Time : Duration := Base_Time; - Abs_Time : Duration; - Request : aliased timespec; - Result : Interfaces.C.int; - - begin - pragma Assert (Check_Sleep (Reason)); - 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 := - cond_timedwait - (Self_ID.Common.LL.CV'Access, - Single_RTS_Lock.L'Access, Request'Access); - else - Result := - cond_timedwait - (Self_ID.Common.LL.CV'Access, - Self_ID.Common.LL.L.L'Access, Request'Access); - end if; - - Yielded := True; - - 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 = ETIME); - end loop; - end if; - - pragma Assert - (Record_Wakeup (To_Lock_Ptr (Self_ID.Common.LL.L'Access), Reason)); - end Timed_Sleep; - - ----------------- - -- Timed_Delay -- - ----------------- - - 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; - Yielded : Boolean := False; - - 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; - - pragma Assert (Check_Sleep (Delay_Sleep)); - - loop - exit when Self_ID.Pending_ATC_Level < Self_ID.ATC_Nesting_Level; - - if Single_Lock then - Result := - cond_timedwait - (Self_ID.Common.LL.CV'Access, - Single_RTS_Lock.L'Access, - Request'Access); - else - Result := - cond_timedwait - (Self_ID.Common.LL.CV'Access, - Self_ID.Common.LL.L.L'Access, - Request'Access); - end if; - - Yielded := True; - - Check_Time := Monotonic_Clock; - exit when Abs_Time <= Check_Time or else Check_Time < Base_Time; - - pragma Assert - (Result = 0 or else - Result = ETIME or else - Result = EINTR); - end loop; - - pragma Assert - (Record_Wakeup - (To_Lock_Ptr (Self_ID.Common.LL.L'Access), Delay_Sleep)); - - Self_ID.Common.State := Runnable; - end if; - - Unlock (Self_ID); - - if Single_Lock then - Unlock_RTS; - end if; - - if not Yielded then - thr_yield; - end if; - end Timed_Delay; - - ------------ - -- Wakeup -- - ------------ - - procedure Wakeup - (T : Task_Id; - Reason : Task_States) - is - Result : Interfaces.C.int; - begin - pragma Assert (Check_Wakeup (T, Reason)); - Result := cond_signal (T.Common.LL.CV'Access); - pragma Assert (Result = 0); - end Wakeup; - - --------------------------- - -- Check_Initialize_Lock -- - --------------------------- - - -- The following code is intended to check some of the invariant assertions - -- related to lock usage, on which we depend. - - function Check_Initialize_Lock - (L : Lock_Ptr; - Level : Lock_Level) return Boolean - is - Self_ID : constant Task_Id := Self; - - begin - -- Check that caller is abort-deferred - - if Self_ID.Deferral_Level = 0 then - return False; - end if; - - -- Check that the lock is not yet initialized - - if L.Level /= 0 then - return False; - end if; - - L.Level := Lock_Level'Pos (Level) + 1; - return True; - end Check_Initialize_Lock; - - ---------------- - -- Check_Lock -- - ---------------- - - function Check_Lock (L : Lock_Ptr) return Boolean is - Self_ID : constant Task_Id := Self; - P : Lock_Ptr; - - begin - -- Check that the argument is not null - - if L = null then - return False; - end if; - - -- Check that L is not frozen - - if L.Frozen then - return False; - end if; - - -- Check that caller is abort-deferred - - if Self_ID.Deferral_Level = 0 then - return False; - end if; - - -- Check that caller is not holding this lock already - - if L.Owner = To_Owner_ID (To_Address (Self_ID)) then - return False; - end if; - - if Single_Lock then - return True; - end if; - - -- Check that TCB lock order rules are satisfied - - P := Self_ID.Common.LL.Locks; - if P /= null then - if P.Level >= L.Level - and then (P.Level > 2 or else L.Level > 2) - then - return False; - end if; - end if; - - return True; - end Check_Lock; - - ----------------- - -- Record_Lock -- - ----------------- - - function Record_Lock (L : Lock_Ptr) return Boolean is - Self_ID : constant Task_Id := Self; - P : Lock_Ptr; - - begin - Lock_Count := Lock_Count + 1; - - -- There should be no owner for this lock at this point - - if L.Owner /= null then - return False; - end if; - - -- Record new owner - - L.Owner := To_Owner_ID (To_Address (Self_ID)); - - if Single_Lock then - return True; - end if; - - -- Check that TCB lock order rules are satisfied - - P := Self_ID.Common.LL.Locks; - - if P /= null then - L.Next := P; - end if; - - Self_ID.Common.LL.Locking := null; - Self_ID.Common.LL.Locks := L; - return True; - end Record_Lock; - - ----------------- - -- Check_Sleep -- - ----------------- - - function Check_Sleep (Reason : Task_States) return Boolean is - pragma Unreferenced (Reason); - - Self_ID : constant Task_Id := Self; - P : Lock_Ptr; - - begin - -- Check that caller is abort-deferred - - if Self_ID.Deferral_Level = 0 then - return False; - end if; - - if Single_Lock then - return True; - end if; - - -- Check that caller is holding own lock, on top of list - - if Self_ID.Common.LL.Locks /= - To_Lock_Ptr (Self_ID.Common.LL.L'Access) - then - return False; - end if; - - -- Check that TCB lock order rules are satisfied - - if Self_ID.Common.LL.Locks.Next /= null then - return False; - end if; - - Self_ID.Common.LL.L.Owner := null; - P := Self_ID.Common.LL.Locks; - Self_ID.Common.LL.Locks := Self_ID.Common.LL.Locks.Next; - P.Next := null; - return True; - end Check_Sleep; - - ------------------- - -- Record_Wakeup -- - ------------------- - - function Record_Wakeup - (L : Lock_Ptr; - Reason : Task_States) return Boolean - is - pragma Unreferenced (Reason); - - Self_ID : constant Task_Id := Self; - P : Lock_Ptr; - - begin - -- Record new owner - - L.Owner := To_Owner_ID (To_Address (Self_ID)); - - if Single_Lock then - return True; - end if; - - -- Check that TCB lock order rules are satisfied - - P := Self_ID.Common.LL.Locks; - - if P /= null then - L.Next := P; - end if; - - Self_ID.Common.LL.Locking := null; - Self_ID.Common.LL.Locks := L; - return True; - end Record_Wakeup; - - ------------------ - -- Check_Wakeup -- - ------------------ - - function Check_Wakeup - (T : Task_Id; - Reason : Task_States) return Boolean - is - Self_ID : constant Task_Id := Self; - - begin - -- Is caller holding T's lock? - - if T.Common.LL.L.Owner /= To_Owner_ID (To_Address (Self_ID)) then - return False; - end if; - - -- Are reasons for wakeup and sleep consistent? - - if T.Common.State /= Reason then - return False; - end if; - - return True; - end Check_Wakeup; - - ------------------ - -- Check_Unlock -- - ------------------ - - function Check_Unlock (L : Lock_Ptr) return Boolean is - Self_ID : constant Task_Id := Self; - P : Lock_Ptr; - - begin - Unlock_Count := Unlock_Count + 1; - - if L = null then - return False; - end if; - - if L.Buddy /= null then - return False; - end if; - - -- Magic constant 4??? - - if L.Level = 4 then - Check_Count := Unlock_Count; - end if; - - -- Magic constant 1000??? - - if Unlock_Count - Check_Count > 1000 then - Check_Count := Unlock_Count; - end if; - - -- Check that caller is abort-deferred - - if Self_ID.Deferral_Level = 0 then - return False; - end if; - - -- Check that caller is holding this lock, on top of list - - if Self_ID.Common.LL.Locks /= L then - return False; - end if; - - -- Record there is no owner now - - L.Owner := null; - P := Self_ID.Common.LL.Locks; - Self_ID.Common.LL.Locks := Self_ID.Common.LL.Locks.Next; - P.Next := null; - return True; - end Check_Unlock; - - -------------------- - -- Check_Finalize -- - -------------------- - - function Check_Finalize_Lock (L : Lock_Ptr) return Boolean is - Self_ID : constant Task_Id := Self; - - begin - -- Check that caller is abort-deferred - - if Self_ID.Deferral_Level = 0 then - return False; - end if; - - -- Check that no one is holding this lock - - if L.Owner /= null then - return False; - end if; - - L.Frozen := True; - return True; - end Check_Finalize_Lock; - - ---------------- - -- Initialize -- - ---------------- - - procedure Initialize (S : in out Suspension_Object) is - Result : Interfaces.C.int; - - begin - -- Initialize internal state (always to zero (RM D.10(6))) - - S.State := False; - S.Waiting := False; - - -- Initialize internal mutex - - Result := mutex_init (S.L'Access, USYNC_THREAD, System.Null_Address); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result = ENOMEM then - raise Storage_Error with "Failed to allocate a lock"; - end if; - - -- Initialize internal condition variable - - Result := cond_init (S.CV'Access, USYNC_THREAD, 0); - pragma Assert (Result = 0 or else Result = ENOMEM); - - if Result /= 0 then - Result := 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 := mutex_destroy (S.L'Access); - pragma Assert (Result = 0); - - -- Destroy internal condition variable - - Result := 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 := mutex_lock (S.L'Access); - pragma Assert (Result = 0); - - S.State := False; - - Result := 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 := 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 := cond_signal (S.CV'Access); - pragma Assert (Result = 0); - - else - S.State := True; - end if; - - Result := 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 := 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 := 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 := cond_wait (S.CV'Access, S.L'Access); - end if; - - Result := mutex_unlock (S.L'Access); - pragma Assert (Result = 0); - - SSL.Abort_Undefer.all; - end if; - end Suspend_Until_True; - - ---------------- - -- Check_Exit -- - ---------------- - - function Check_Exit (Self_ID : Task_Id) return Boolean is - begin - -- Check that caller is just holding Global_Task_Lock and no other locks - - if Self_ID.Common.LL.Locks = null then - return False; - end if; - - -- 2 = Global_Task_Level - - if Self_ID.Common.LL.Locks.Level /= 2 then - return False; - end if; - - if Self_ID.Common.LL.Locks.Next /= null then - return False; - end if; - - -- Check that caller is abort-deferred - - if Self_ID.Deferral_Level = 0 then - return False; - end if; - - return True; - end Check_Exit; - - -------------------- - -- Check_No_Locks -- - -------------------- - - function Check_No_Locks (Self_ID : Task_Id) return Boolean is - begin - return Self_ID.Common.LL.Locks = null; - 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 thr_suspend (T.Common.LL.Thread) = 0; - else - return True; - end if; - end Suspend_Task; - - ----------------- - -- Resume_Task -- - ----------------- - - function Resume_Task - (T : ST.Task_Id; - Thread_Self : Thread_Id) return Boolean - is - begin - if T.Common.LL.Thread /= Thread_Self then - return thr_continue (T.Common.LL.Thread) = 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; - -end System.Task_Primitives.Operations; |