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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) 1995-2011, 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 LynxOS (POSIX Threads) version of this package

--  This package encapsulates all direct interfaces to OS services

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

--  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;

package System.OS_Interface is

   pragma Preelaborate;

   pragma Linker_Options ("-mthreads");

   --  Selects the POSIX 1.c runtime, rather than the non-threading runtime

   --  or the deprecated legacy threads library. The -mthreads flag is

   --  defined in patch.LynxOS and matches the definition for Lynx's gcc.

   subtype int            is Interfaces.C.int;

   subtype short          is Interfaces.C.short;

   subtype long           is Interfaces.C.long;

   subtype unsigned       is Interfaces.C.unsigned;

   subtype unsigned_short is Interfaces.C.unsigned_short;

   subtype unsigned_long  is Interfaces.C.unsigned_long;

   subtype unsigned_char  is Interfaces.C.unsigned_char;

   subtype plain_char     is Interfaces.C.plain_char;

   subtype size_t         is Interfaces.C.size_t;

   -----------

   -- Errno --

   -----------

   function errno return int;

   pragma Import (C, errno, "__get_errno");

   EAGAIN    : constant := 11;

   EINTR     : constant := 4;

   EINVAL    : constant := 22;

   ENOMEM    : constant := 12;

   ETIMEDOUT : constant := 60;

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

   -- Signals --

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

   Max_Interrupt : constant := 63;

   --  Max_Interrupt is the number of OS signals, as defined in:

   --

   --   /usr/include/sys/signal.h

   --

   --

   --  The lowest numbered signal is 1, but 0 is a valid argument to some

   --  library functions, e.g. kill(2). However, 0 is not just another

   --  signal: For instance 'I in Signal' and similar should be used with

   --  caution.

   type Signal is new int range 0 .. Max_Interrupt;

   for  Signal'Size use int'Size;

   SIGHUP        : constant := 1;  --  hangup

   SIGINT        : constant := 2;  --  interrupt (rubout)

   SIGQUIT       : constant := 3;  --  quit (ASCD FS)

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

   SIGTRAP       : constant := 5;  --  trace trap (not reset)

   SIGBRK        : constant := 6;  --  break

   SIGIOT        : constant := 6;  --  IOT instruction

   SIGABRT       : constant := 6;  --  used by abort, replace SIGIOT in future

   SIGCORE       : constant := 7;  --  kill with core dump

   SIGEMT        : constant := 7;  --  EMT instruction

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

   SIGKILL       : constant := 9;  --  kill (cannot be caught or ignored)

   SIGBUS        : constant := 10; --  bus error

   SIGSEGV       : constant := 11; --  segmentation violation

   SIGSYS        : constant := 12; --  bad argument to system call

   SIGPIPE       : constant := 13; --  write on a pipe with no one to read it

   SIGALRM       : constant := 14; --  alarm clock

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

   SIGURG        : constant := 16; --  urgent condition on IO channel

   SIGSTOP       : constant := 17; --  stop (cannot be caught or ignored)

   SIGTSTP       : constant := 18; --  user stop requested from tty

   SIGCONT       : constant := 19; --  stopped process has been continued

   SIGCLD        : constant := 20; --  alias for SIGCHLD

   SIGCHLD       : constant := 20; --  child status change

   SIGTTIN       : constant := 21; --  background tty read attempted

   SIGTTOU       : constant := 22; --  background tty write attempted

   SIGIO         : constant := 23; --  I/O possible (Solaris SIGPOLL alias)

   SIGPOLL       : constant := 23; --  pollable event occurred

   SIGTHREADKILL : constant := 24; --  Reserved by LynxOS runtime

   SIGXCPU       : constant := 24; --  CPU time limit exceeded

   SIGXFSZ       : constant := 25; --  filesize limit exceeded

   SIGVTALRM     : constant := 26; --  virtual timer expired

   SIGPROF       : constant := 27; --  profiling timer expired

   SIGWINCH      : constant := 28; --  window size change

   SIGLOST       : constant := 29; --  SUN 4.1 compatibility

   SIGUSR1       : constant := 30; --  user defined signal 1

   SIGUSR2       : constant := 31; --  user defined signal 2

   SIGPRIO       : constant := 32;

   --  sent to a process with its priority or group is changed

   SIGADAABORT : constant := SIGABRT;

   --  Change this if you want to use another signal for task abort.

   --  SIGTERM might be a good one.

   type Signal_Set is array (Natural range <>) of Signal;

   Unmasked    : constant Signal_Set :=

     (SIGTRAP, SIGTTIN, SIGTTOU, SIGTSTP, SIGPROF, SIGTHREADKILL);

   Reserved    : constant Signal_Set := (SIGABRT, SIGKILL, SIGSTOP, SIGPRIO);

   type sigset_t is private;

   function sigaddset (set : access sigset_t; sig : Signal) return int;

   pragma Import (C, sigaddset, "sigaddset");

   function sigdelset (set : access sigset_t; sig : Signal) return int;

   pragma Import (C, sigdelset, "sigdelset");

   function sigfillset (set : access sigset_t) return int;

   pragma Import (C, sigfillset, "sigfillset");

   function sigismember (set : access sigset_t; sig : Signal) return int;

   pragma Import (C, sigismember, "sigismember");

   function sigemptyset (set : access sigset_t) return int;

   pragma Import (C, sigemptyset, "sigemptyset");

   type struct_sigaction is record

      sa_handler   : System.Address;

      sa_mask      : sigset_t;

      sa_flags     : int;

   end record;

   pragma Convention (C, struct_sigaction);

   type struct_sigaction_ptr is access all struct_sigaction;

   SA_SIGINFO : constant := 16#80#;

   SA_ONSTACK : constant := 16#00#;

   --  SA_ONSTACK is not defined on LynxOS, but it is referred to in the POSIX

   --  implementation of System.Interrupt_Management. Therefore we define a

   --  dummy value of zero here so that setting this flag is a nop.

   SIG_BLOCK   : constant := 0;

   SIG_UNBLOCK : constant := 1;

   SIG_SETMASK : constant := 2;

   SIG_DFL : constant := 0;

   SIG_IGN : constant := 1;

   function sigaction

     (sig  : Signal;

      act  : struct_sigaction_ptr;

      oact : struct_sigaction_ptr) return int;

   pragma Import (C, sigaction, "sigaction");

   ----------

   -- Time --

   ----------

   Time_Slice_Supported : constant Boolean := True;

   --  Indicates whether time slicing is supported

   type timespec is private;

   type clockid_t is new int;

   function clock_gettime

     (clock_id : clockid_t;

      tp       : access timespec) return int;

   pragma Import (C, clock_gettime, "clock_gettime");

   function clock_getres

     (clock_id : clockid_t;

      res      : access timespec) return int;

   pragma Import (C, clock_getres, "clock_getres");

   function To_Duration (TS : timespec) return Duration;

   pragma Inline (To_Duration);

   function To_Timespec (D : Duration) return timespec;

   pragma Inline (To_Timespec);

   type struct_timezone is record

      tz_minuteswest : int;

      tz_dsttime     : int;

   end record;

   pragma Convention (C, struct_timezone);

   type struct_timezone_ptr is access all struct_timezone;

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

   -- Priority Scheduling --

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

   SCHED_FIFO  : constant := 16#200000#;

   SCHED_RR    : constant := 16#100000#;

   SCHED_OTHER : constant := 16#400000#;

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

   -- Process --

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

   type pid_t is private;

   function kill (pid : pid_t; sig : Signal) return int;

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

   function getpid return pid_t;

   pragma Import (C, getpid, "getpid");

   ---------

   -- LWP --

   ---------

   function lwp_self return System.Address;

   pragma Import (C, lwp_self, "pthread_self");

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

   -- 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);

   type pthread_t           is private;

   subtype Thread_Id        is pthread_t;

   type pthread_mutex_t     is limited private;

   type pthread_cond_t      is limited private;

   type pthread_attr_t      is limited private;

   type pthread_mutexattr_t is limited private;

   type pthread_condattr_t  is limited private;

   type pthread_key_t       is private;

   PTHREAD_CREATE_DETACHED : constant := 1;

   PTHREAD_CREATE_JOINABLE : constant := 0;

   -----------

   -- Stack --

   -----------

   Alternate_Stack_Size : constant := 0;

   --  No alternate signal stack is used on this platform

   Stack_Base_Available : constant Boolean := False;

   --  Indicates whether the stack base is available on this target

   function Get_Stack_Base (thread : pthread_t) return Address;

   pragma Inline (Get_Stack_Base);

   --  Returns the stack base of the specified thread.

   --  Only call this function when Stack_Base_Available is True.

   function Get_Page_Size return size_t;

   function Get_Page_Size return Address;

   pragma Import (C, Get_Page_Size, "getpagesize");

   --  Returns the size of a page, or 0 if this is not relevant on this

   --  target

   PROT_NONE  : constant := 1;

   PROT_READ  : constant := 2;

   PROT_WRITE : constant := 4;

   PROT_EXEC  : constant := 8;

   PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;

   PROT_ON    : constant := PROT_READ;

   PROT_OFF   : constant := PROT_ALL;

   function mprotect (addr : Address; len : size_t; prot : int) return int;

   pragma Import (C, mprotect);

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

   -- Nonstandard Thread Initialization --

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

   procedure pthread_init;

   --  This is a dummy procedure to share some GNULLI files

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

   -- POSIX.1c  Section 3 --

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

   function sigwait

     (set : access sigset_t;

      sig : access Signal) return int;

   pragma Inline (sigwait);

   --  LynxOS has non standard sigwait

   function pthread_kill

     (thread : pthread_t;

      sig    : Signal) return int;

   pragma Import (C, pthread_kill, "pthread_kill");

   function pthread_sigmask

     (how  : int;

      set  : access sigset_t;

      oset : access sigset_t) return int;

   pragma Import (C, pthread_sigmask, "pthread_sigmask");

   --  The behavior of pthread_sigmask on LynxOS requires

   --  further investigation.

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

   --  POSIX.1c  Section 11  --

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

   function pthread_mutexattr_init

     (attr : access pthread_mutexattr_t) return int;

   pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");

   function pthread_mutexattr_destroy

     (attr : access pthread_mutexattr_t) return int;

   pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");

   function pthread_mutex_init

     (mutex : access pthread_mutex_t;

      attr  : access pthread_mutexattr_t) return int;

   pragma Import (C, pthread_mutex_init, "pthread_mutex_init");

   function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;

   pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");

   function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;

   pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");

   function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;

   pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");

   function pthread_condattr_init

     (attr : access pthread_condattr_t) return int;

   pragma Import (C, pthread_condattr_init, "pthread_condattr_init");

   function pthread_condattr_destroy

     (attr : access pthread_condattr_t) return int;

   pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");

   function pthread_cond_init

     (cond : access pthread_cond_t;

      attr : access pthread_condattr_t) return int;

   pragma Import (C, pthread_cond_init, "pthread_cond_init");

   function pthread_cond_destroy (cond : access pthread_cond_t) return int;

   pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");

   function pthread_cond_signal (cond : access pthread_cond_t) return int;

   pragma Import (C, pthread_cond_signal, "pthread_cond_signal");

   function pthread_cond_wait

     (cond  : access pthread_cond_t;

      mutex : access pthread_mutex_t) return int;

   pragma Import (C, pthread_cond_wait, "pthread_cond_wait");

   function pthread_cond_timedwait

     (cond    : access pthread_cond_t;

      mutex   : access pthread_mutex_t;

      abstime : access timespec) return int;

   pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");

   Relative_Timed_Wait : constant Boolean := False;

   --  pthread_cond_timedwait requires an absolute delay time

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

   -- POSIX.1c  Section 13 --

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

   PTHREAD_PRIO_NONE    : constant := 0;

   PTHREAD_PRIO_INHERIT : constant := 1;

   PTHREAD_PRIO_PROTECT : constant := 2;

   function pthread_mutexattr_setprotocol

     (attr     : access pthread_mutexattr_t;

      protocol : int) return int;

   pragma Import (C, pthread_mutexattr_setprotocol);

   function pthread_mutexattr_setprioceiling

     (attr        : access pthread_mutexattr_t;

      prioceiling : int) return int;

   pragma Import (C, pthread_mutexattr_setprioceiling);

   type struct_sched_param is record

      sched_priority : int;

   end record;

   function pthread_setschedparam

     (thread : pthread_t;

      policy : int;

      param  : access struct_sched_param) return int;

   pragma Import (C, pthread_setschedparam, "pthread_setschedparam");

   function pthread_attr_setscope

     (attr            : access pthread_attr_t;

      contentionscope : int) return int;

   pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");

   function pthread_attr_setinheritsched

     (attr         : access pthread_attr_t;

      inheritsched : int) return int;

   pragma Import (C, pthread_attr_setinheritsched);

   function pthread_attr_setschedpolicy

     (attr   : access pthread_attr_t;

      policy : int) return int;

   pragma Import (C, pthread_attr_setschedpolicy);

   function sched_yield return int;

   pragma Import (C, sched_yield, "sched_yield");

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

   -- P1003.1c  Section 16 --

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

   function pthread_attr_init (attributes : access pthread_attr_t) return int;

   pragma Import (C, pthread_attr_init, "pthread_attr_init");

   function pthread_attr_destroy

     (attributes : access pthread_attr_t) return int;

   pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");

   function pthread_attr_setdetachstate

     (attr        : access pthread_attr_t;

      detachstate : int) return int;

   pragma Import (C, pthread_attr_setdetachstate);

   function pthread_attr_setstacksize

     (attr      : access pthread_attr_t;

      stacksize : size_t) return int;

   pragma Import (C, pthread_attr_setstacksize);

   function pthread_create

     (thread        : access pthread_t;

      attributes    : access pthread_attr_t;

      start_routine : Thread_Body;

      arg           : System.Address) return int;

   pragma Import (C, pthread_create, "pthread_create");

   procedure pthread_exit (status : System.Address);

   pragma Import (C, pthread_exit, "pthread_exit");

   function pthread_self return pthread_t;

   pragma Import (C, pthread_self, "pthread_self");

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

   -- POSIX.1c  Section 17 --

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

   function st_setspecific

     (key   : pthread_key_t;

      value : System.Address) return int;

   pragma Import (C, st_setspecific, "st_setspecific");

   function st_getspecific

     (key    : pthread_key_t;

      retval : System.Address) return int;

   pragma Import (C, st_getspecific, "st_getspecific");

   type destructor_pointer is access procedure (arg : System.Address);

   pragma Convention (C, destructor_pointer);

   function st_keycreate

     (destructor : destructor_pointer;

      key        : access pthread_key_t) return int;

   pragma Import (C, st_keycreate, "st_keycreate");

private

   type sigset_t is record

      X1, X2 : long;

   end record;

   pragma Convention (C, sigset_t);

   type pid_t is new long;

   type time_t is new long;

   type timespec is record

      tv_sec  : time_t;

      tv_nsec : long;

   end record;

   pragma Convention (C, timespec);

   type st_attr_t is record

      stksize      : int;

      prio         : int;

      inheritsched : int;

      state        : int;

      sched        : int;

      detachstate  : int;

      guardsize    : int;

   end record;

   pragma Convention (C, st_attr_t);

   type pthread_attr_t is record

      pthread_attr_magic : unsigned;

      st                 : st_attr_t;

      pthread_attr_scope : int;

   end record;

   pragma Convention (C, pthread_attr_t);

   type pthread_condattr_t is record

      cv_magic   : unsigned;

      cv_pshared : unsigned;

   end record;

   pragma Convention (C, pthread_condattr_t);

   type pthread_mutexattr_t is record

      m_flags   : unsigned;

      m_prio_c  : int;

      m_pshared : int;

   end record;

   pragma Convention (C, pthread_mutexattr_t);

   type tid_t is new short;

   type pthread_t is new tid_t;

   type block_obj_t is new System.Address;

   --  typedef struct _block_obj_s {

   --     struct st_entry *b_head;

   --  } block_obj_t;

   type pthread_mutex_t is record

      m_flags      : unsigned;

      m_owner      : tid_t;

      m_wait       : block_obj_t;

      m_prio_c     : int;

      m_oldprio    : int;

      m_count      : int;

      m_referenced : int;

   end record;

   pragma Convention (C, pthread_mutex_t);

   type pthread_mutex_t_ptr is access all pthread_mutex_t;

   type pthread_cond_t is record

      cv_magic  : unsigned;

      cv_wait   : block_obj_t;

      cv_mutex  : pthread_mutex_t_ptr;

      cv_refcnt : int;

   end record;

   pragma Convention (C, pthread_cond_t);

   type pthread_key_t is new int;

end System.OS_Interface;