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------------------------------------------------------------------------------

--                                                                          --

--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --

--                                                                          --

--                   S Y S T E M . O S _ I N T E R F A C E                  --

--                                                                          --

--                                  S p e c                                 --

--                                                                          --

--             Copyright (C) 1991-1994, Florida State University            --

--          Copyright (C) 1995-2010, Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT 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 NT (native) version of this package

--  This package encapsulates all direct interfaces to OS services

--  that are needed by the tasking run-time (libgnarl). For non tasking

--  oriented services consider declaring them into system-win32.

--  PLEASE DO NOT add any with-clauses to this package or remove the pragma

--  Preelaborate. This package is designed to be a bottom-level (leaf) package.

with Ada.Unchecked_Conversion;

with Interfaces.C;

with Interfaces.C.Strings;

with System.Win32;

package System.OS_Interface is

   pragma Preelaborate;

   pragma Linker_Options ("-mthreads");

   subtype int  is Interfaces.C.int;

   subtype long is Interfaces.C.long;

   -------------------

   -- General Types --

   -------------------

   subtype PSZ   is Interfaces.C.Strings.chars_ptr;

   Null_Void : constant Win32.PVOID := System.Null_Address;

   -------------------------

   -- Handles for objects --

   -------------------------

   subtype Thread_Id is Win32.HANDLE;

   -----------

   -- Errno --

   -----------

   NO_ERROR : constant := 0;

   FUNC_ERR : constant := -1;

   -------------

   -- Signals --

   -------------

   Max_Interrupt : constant := 31;

   type Signal is new int range 0 .. Max_Interrupt;

   for Signal'Size use int'Size;

   SIGINT     : constant := 2; --  interrupt (Ctrl-C)

   SIGILL     : constant := 4; --  illegal instruction (not reset)

   SIGFPE     : constant := 8; --  floating point exception

   SIGSEGV    : constant := 11; -- segmentation violation

   SIGTERM    : constant := 15; -- software termination signal from kill

   SIGBREAK   : constant := 21; -- break (Ctrl-Break)

   SIGABRT    : constant := 22; -- used by abort, replace SIGIOT in the future

   type sigset_t is private;

   type isr_address is access procedure (sig : int);

   pragma Convention (C, isr_address);

   function intr_attach (sig : int; handler : isr_address) return long;

   pragma Import (C, intr_attach, "signal");

   Intr_Attach_Reset : constant Boolean := True;

   --  True if intr_attach is reset after an interrupt handler is called

   procedure kill (sig : Signal);

   pragma Import (C, kill, "raise");

   -------------

   -- Threads --

   -------------

   type Thread_Body is access

     function (arg : System.Address) return System.Address;

   pragma Convention (C, Thread_Body);

   function Thread_Body_Access is new

     Ada.Unchecked_Conversion (System.Address, Thread_Body);

   procedure SwitchToThread;

   pragma Import (Stdcall, SwitchToThread, "SwitchToThread");

   function GetThreadTimes

     (hThread        : Win32.HANDLE;

      lpCreationTime : access Long_Long_Integer;

      lpExitTime     : access Long_Long_Integer;

      lpKernelTime   : access Long_Long_Integer;

      lpUserTime     : access Long_Long_Integer) return Win32.BOOL;

   pragma Import (Stdcall, GetThreadTimes, "GetThreadTimes");

   -----------------------

   -- Critical sections --

   -----------------------

   type CRITICAL_SECTION is private;

   -------------------------------------------------------------

   -- Thread Creation, Activation, Suspension And Termination --

   -------------------------------------------------------------

   type PTHREAD_START_ROUTINE is access function

     (pThreadParameter : Win32.PVOID) return Win32.DWORD;

   pragma Convention (Stdcall, PTHREAD_START_ROUTINE);

   function To_PTHREAD_START_ROUTINE is new

     Ada.Unchecked_Conversion (System.Address, PTHREAD_START_ROUTINE);

   function CreateThread

     (pThreadAttributes : access Win32.SECURITY_ATTRIBUTES;

      dwStackSize       : Win32.DWORD;

      pStartAddress     : PTHREAD_START_ROUTINE;

      pParameter        : Win32.PVOID;

      dwCreationFlags   : Win32.DWORD;

      pThreadId         : access Win32.DWORD) return Win32.HANDLE;

   pragma Import (Stdcall, CreateThread, "CreateThread");

   function BeginThreadEx

     (pThreadAttributes : access Win32.SECURITY_ATTRIBUTES;

      dwStackSize       : Win32.DWORD;

      pStartAddress     : PTHREAD_START_ROUTINE;

      pParameter        : Win32.PVOID;

      dwCreationFlags   : Win32.DWORD;

      pThreadId         : not null access Win32.DWORD) return Win32.HANDLE;

   pragma Import (C, BeginThreadEx, "_beginthreadex");

   Debug_Process                     : constant := 16#00000001#;

   Debug_Only_This_Process           : constant := 16#00000002#;

   Create_Suspended                  : constant := 16#00000004#;

   Detached_Process                  : constant := 16#00000008#;

   Create_New_Console                : constant := 16#00000010#;

   Create_New_Process_Group          : constant := 16#00000200#;

   Create_No_window                  : constant := 16#08000000#;

   Profile_User                      : constant := 16#10000000#;

   Profile_Kernel                    : constant := 16#20000000#;

   Profile_Server                    : constant := 16#40000000#;

   Stack_Size_Param_Is_A_Reservation : constant := 16#00010000#;

   function GetExitCodeThread

     (hThread   : Win32.HANDLE;

      pExitCode : not null access Win32.DWORD) return Win32.BOOL;

   pragma Import (Stdcall, GetExitCodeThread, "GetExitCodeThread");

   function ResumeThread (hThread : Win32.HANDLE) return Win32.DWORD;

   pragma Import (Stdcall, ResumeThread, "ResumeThread");

   function SuspendThread (hThread : Win32.HANDLE) return Win32.DWORD;

   pragma Import (Stdcall, SuspendThread, "SuspendThread");

   procedure ExitThread (dwExitCode : Win32.DWORD);

   pragma Import (Stdcall, ExitThread, "ExitThread");

   procedure EndThreadEx (dwExitCode : Win32.DWORD);

   pragma Import (C, EndThreadEx, "_endthreadex");

   function TerminateThread

     (hThread    : Win32.HANDLE;

      dwExitCode : Win32.DWORD) return Win32.BOOL;

   pragma Import (Stdcall, TerminateThread, "TerminateThread");

   function GetCurrentThread return Win32.HANDLE;

   pragma Import (Stdcall, GetCurrentThread, "GetCurrentThread");

   function GetCurrentProcess return Win32.HANDLE;

   pragma Import (Stdcall, GetCurrentProcess, "GetCurrentProcess");

   function GetCurrentThreadId return Win32.DWORD;

   pragma Import (Stdcall, GetCurrentThreadId, "GetCurrentThreadId");

   function TlsAlloc return Win32.DWORD;

   pragma Import (Stdcall, TlsAlloc, "TlsAlloc");

   function TlsGetValue (dwTlsIndex : Win32.DWORD) return Win32.PVOID;

   pragma Import (Stdcall, TlsGetValue, "TlsGetValue");

   function TlsSetValue

     (dwTlsIndex : Win32.DWORD; pTlsValue : Win32.PVOID) return Win32.BOOL;

   pragma Import (Stdcall, TlsSetValue, "TlsSetValue");

   function TlsFree (dwTlsIndex : Win32.DWORD) return Win32.BOOL;

   pragma Import (Stdcall, TlsFree, "TlsFree");

   TLS_Nothing : constant := Win32.DWORD'Last;

   procedure ExitProcess (uExitCode : Interfaces.C.unsigned);

   pragma Import (Stdcall, ExitProcess, "ExitProcess");

   function WaitForSingleObject

     (hHandle        : Win32.HANDLE;

      dwMilliseconds : Win32.DWORD) return Win32.DWORD;

   pragma Import (Stdcall, WaitForSingleObject, "WaitForSingleObject");

   function WaitForSingleObjectEx

     (hHandle        : Win32.HANDLE;

      dwMilliseconds : Win32.DWORD;

      fAlertable     : Win32.BOOL) return Win32.DWORD;

   pragma Import (Stdcall, WaitForSingleObjectEx, "WaitForSingleObjectEx");

   Wait_Infinite : constant := Win32.DWORD'Last;

   WAIT_TIMEOUT  : constant := 16#0000_0102#;

   WAIT_FAILED   : constant := 16#FFFF_FFFF#;

   ------------------------------------

   -- Semaphores, Events and Mutexes --

   ------------------------------------

   function CreateSemaphore

     (pSemaphoreAttributes : access Win32.SECURITY_ATTRIBUTES;

      lInitialCount        : Interfaces.C.long;

      lMaximumCount        : Interfaces.C.long;

      pName                : PSZ) return Win32.HANDLE;

   pragma Import (Stdcall, CreateSemaphore, "CreateSemaphoreA");

   function OpenSemaphore

     (dwDesiredAccess : Win32.DWORD;

      bInheritHandle  : Win32.BOOL;

      pName           : PSZ) return Win32.HANDLE;

   pragma Import (Stdcall, OpenSemaphore, "OpenSemaphoreA");

   function ReleaseSemaphore

     (hSemaphore     : Win32.HANDLE;

      lReleaseCount  : Interfaces.C.long;

      pPreviousCount : access Win32.LONG) return Win32.BOOL;

   pragma Import (Stdcall, ReleaseSemaphore, "ReleaseSemaphore");

   function CreateEvent

     (pEventAttributes : access Win32.SECURITY_ATTRIBUTES;

      bManualReset     : Win32.BOOL;

      bInitialState    : Win32.BOOL;

      pName            : PSZ) return Win32.HANDLE;

   pragma Import (Stdcall, CreateEvent, "CreateEventA");

   function OpenEvent

     (dwDesiredAccess : Win32.DWORD;

      bInheritHandle  : Win32.BOOL;

      pName           : PSZ) return Win32.HANDLE;

   pragma Import (Stdcall, OpenEvent, "OpenEventA");

   function SetEvent (hEvent : Win32.HANDLE) return Win32.BOOL;

   pragma Import (Stdcall, SetEvent, "SetEvent");

   function ResetEvent (hEvent : Win32.HANDLE) return Win32.BOOL;

   pragma Import (Stdcall, ResetEvent, "ResetEvent");

   function PulseEvent (hEvent : Win32.HANDLE) return Win32.BOOL;

   pragma Import (Stdcall, PulseEvent, "PulseEvent");

   function CreateMutex

     (pMutexAttributes : access Win32.SECURITY_ATTRIBUTES;

      bInitialOwner    : Win32.BOOL;

      pName            : PSZ) return Win32.HANDLE;

   pragma Import (Stdcall, CreateMutex, "CreateMutexA");

   function OpenMutex

     (dwDesiredAccess : Win32.DWORD;

      bInheritHandle  : Win32.BOOL;

      pName           : PSZ) return Win32.HANDLE;

   pragma Import (Stdcall, OpenMutex, "OpenMutexA");

   function ReleaseMutex (hMutex : Win32.HANDLE) return Win32.BOOL;

   pragma Import (Stdcall, ReleaseMutex, "ReleaseMutex");

   ---------------------------------------------------

   -- Accessing properties of Threads and Processes --

   ---------------------------------------------------

   -----------------

   --  Priorities --

   -----------------

   function SetThreadPriority

     (hThread   : Win32.HANDLE;

      nPriority : Interfaces.C.int) return Win32.BOOL;

   pragma Import (Stdcall, SetThreadPriority, "SetThreadPriority");

   function GetThreadPriority (hThread : Win32.HANDLE) return Interfaces.C.int;

   pragma Import (Stdcall, GetThreadPriority, "GetThreadPriority");

   function SetPriorityClass

     (hProcess        : Win32.HANDLE;

      dwPriorityClass : Win32.DWORD) return Win32.BOOL;

   pragma Import (Stdcall, SetPriorityClass, "SetPriorityClass");

   procedure SetThreadPriorityBoost

     (hThread              : Win32.HANDLE;

      DisablePriorityBoost : Win32.BOOL);

   pragma Import (Stdcall, SetThreadPriorityBoost, "SetThreadPriorityBoost");

   Normal_Priority_Class   : constant := 16#00000020#;

   Idle_Priority_Class     : constant := 16#00000040#;

   High_Priority_Class     : constant := 16#00000080#;

   Realtime_Priority_Class : constant := 16#00000100#;

   Thread_Priority_Idle          : constant := -15;

   Thread_Priority_Lowest        : constant := -2;

   Thread_Priority_Below_Normal  : constant := -1;

   Thread_Priority_Normal        : constant := 0;

   Thread_Priority_Above_Normal  : constant := 1;

   Thread_Priority_Highest       : constant := 2;

   Thread_Priority_Time_Critical : constant := 15;

   Thread_Priority_Error_Return  : constant := Interfaces.C.long'Last;

private

   type sigset_t is new Interfaces.C.unsigned_long;

   type CRITICAL_SECTION is record

      DebugInfo : System.Address;

      LockCount      : Long_Integer;

      RecursionCount : Long_Integer;

      OwningThread   : Win32.HANDLE;

      --  The above three fields control entering and exiting the critical

      --  section for the resource.

      LockSemaphore : Win32.HANDLE;

      SpinCount     : Win32.DWORD;

   end record;

end System.OS_Interface;