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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) 1995-2008, Free Software Foundation, Inc.         --

--                                                                          --

-- GNARL is free software; you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 2,  or (at your option) any later ver- --

-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNARL; see file COPYING.  If not, write --

-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --

-- Boston, MA 02110-1301, USA.                                              --

--                                                                          --

-- As a special exception,  if other files  instantiate  generics from this --

-- unit, or you link  this unit with other files  to produce an executable, --

-- this  unit  does not  by itself cause  the resulting  executable  to  be --

-- covered  by the  GNU  General  Public  License.  This exception does not --

-- however invalidate  any other reasons why  the executable file  might be --

-- covered by the  GNU Public License.                                      --

--                                                                          --

-- GNARL was developed by the GNARL team at Florida State University.       --

-- Extensive contributions were provided by Ada Core Technologies, Inc.     --

--                                                                          --

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

--  This is a GNU/Linux (GNU/LinuxThreads) 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;

with System.Linux;

package System.OS_Interface is

   pragma Preelaborate;

   pragma Linker_Options ("-lpthread");

   subtype int            is Interfaces.C.int;

   subtype char           is Interfaces.C.char;

   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 := System.Linux.EAGAIN;

   EINTR     : constant := System.Linux.EINTR;

   EINVAL    : constant := System.Linux.EINVAL;

   ENOMEM    : constant := System.Linux.ENOMEM;

   EPERM     : constant := System.Linux.EPERM;

   ETIMEDOUT : constant := System.Linux.ETIMEDOUT;

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

   -- Signals --

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

   Max_Interrupt : constant := 63;

   type Signal is new int range 0 .. Max_Interrupt;

   for Signal'Size use int'Size;

   SIGHUP     : constant := System.Linux.SIGHUP;

   SIGINT     : constant := System.Linux.SIGINT;

   SIGQUIT    : constant := System.Linux.SIGQUIT;

   SIGILL     : constant := System.Linux.SIGILL;

   SIGTRAP    : constant := System.Linux.SIGTRAP;

   SIGIOT     : constant := System.Linux.SIGIOT;

   SIGABRT    : constant := System.Linux.SIGABRT;

   SIGFPE     : constant := System.Linux.SIGFPE;

   SIGKILL    : constant := System.Linux.SIGKILL;

   SIGBUS     : constant := System.Linux.SIGBUS;

   SIGSEGV    : constant := System.Linux.SIGSEGV;

   SIGPIPE    : constant := System.Linux.SIGPIPE;

   SIGALRM    : constant := System.Linux.SIGALRM;

   SIGTERM    : constant := System.Linux.SIGTERM;

   SIGUSR1    : constant := System.Linux.SIGUSR1;

   SIGUSR2    : constant := System.Linux.SIGUSR2;

   SIGCLD     : constant := System.Linux.SIGCLD;

   SIGCHLD    : constant := System.Linux.SIGCHLD;

   SIGPWR     : constant := System.Linux.SIGPWR;

   SIGWINCH   : constant := System.Linux.SIGWINCH;

   SIGURG     : constant := System.Linux.SIGURG;

   SIGPOLL    : constant := System.Linux.SIGPOLL;

   SIGIO      : constant := System.Linux.SIGIO;

   SIGLOST    : constant := System.Linux.SIGLOST;

   SIGSTOP    : constant := System.Linux.SIGSTOP;

   SIGTSTP    : constant := System.Linux.SIGTSTP;

   SIGCONT    : constant := System.Linux.SIGCONT;

   SIGTTIN    : constant := System.Linux.SIGTTIN;

   SIGTTOU    : constant := System.Linux.SIGTTOU;

   SIGVTALRM  : constant := System.Linux.SIGVTALRM;

   SIGPROF    : constant := System.Linux.SIGPROF;

   SIGXCPU    : constant := System.Linux.SIGXCPU;

   SIGXFSZ    : constant := System.Linux.SIGXFSZ;

   SIGUNUSED  : constant := System.Linux.SIGUNUSED;

   SIGSTKFLT  : constant := System.Linux.SIGSTKFLT;

   SIGLTHRRES : constant := System.Linux.SIGLTHRRES;

   SIGLTHRCAN : constant := System.Linux.SIGLTHRCAN;

   SIGLTHRDBG : constant := System.Linux.SIGLTHRDBG;

   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,

      --  To enable debugging on multithreaded applications, mark SIGTRAP to

      --  be kept unmasked.

      SIGBUS,

      SIGTTIN, SIGTTOU, SIGTSTP,

      --  Keep these three signals unmasked so that background processes

      --  and IO behaves as normal "C" applications

      SIGPROF,

      --  To avoid confusing the profiler

      SIGKILL, SIGSTOP,

      --  These two signals actually cannot be masked;

      --  POSIX simply won't allow it.

      SIGLTHRRES, SIGLTHRCAN, SIGLTHRDBG);

      --  These three signals are used by GNU/LinuxThreads starting from

      --  glibc 2.1 (future 2.2).

   Reserved    : constant Signal_Set :=

   --  I am not sure why the following two signals are reserved.

   --  I guess they are not supported by this version of GNU/Linux.

     (SIGVTALRM, SIGUNUSED);

   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 union_type_3 is new String (1 .. 116);

   type siginfo_t is record

      si_signo : int;

      si_code  : int;

      si_errno : int;

      X_data   : union_type_3;

   end record;

   pragma Convention (C, siginfo_t);

   type struct_sigaction is record

      sa_handler  : System.Address;

      sa_mask     : sigset_t;

      sa_flags    : Interfaces.C.unsigned_long;

      sa_restorer : System.Address;

   end record;

   pragma Convention (C, struct_sigaction);

   type struct_sigaction_ptr is access all struct_sigaction;

   type Machine_State is record

      eip : unsigned_long;

      ebx : unsigned_long;

      esp : unsigned_long;

      ebp : unsigned_long;

      esi : unsigned_long;

      edi : unsigned_long;

   end record;

   type Machine_State_Ptr is access all Machine_State;

   SA_SIGINFO : constant := System.Linux.SA_SIGINFO;

   SA_ONSTACK : constant := System.Linux.SA_ONSTACK;

   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 --

   ----------

   type timespec is private;

   function To_Duration (TS : timespec) return Duration;

   pragma Inline (To_Duration);

   function To_Timespec (D : Duration) return timespec;

   pragma Inline (To_Timespec);

   function sysconf (name : int) return long;

   pragma Import (C, sysconf);

   SC_CLK_TCK          : constant := 2;

   SC_NPROCESSORS_ONLN : constant := 84;

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

   -- Priority Scheduling --

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

   SCHED_OTHER : constant := 0;

   SCHED_FIFO  : constant := 1;

   SCHED_RR    : constant := 2;

   function To_Target_Priority

     (Prio : System.Any_Priority) return Interfaces.C.int;

   --  Maps System.Any_Priority to a POSIX priority

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

   -- 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");

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

   -- 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 new unsigned_long;

   subtype Thread_Id        is pthread_t;

   function To_pthread_t is new Ada.Unchecked_Conversion

     (unsigned_long, 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;

   -----------

   -- Stack --

   -----------

   type stack_t is record

      ss_sp    : System.Address;

      ss_flags : int;

      ss_size  : size_t;

   end record;

   pragma Convention (C, stack_t);

   function sigaltstack

     (ss  : not null access stack_t;

      oss : access stack_t) return int;

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

   Alternate_Stack : aliased System.Address;

   pragma Import (C, Alternate_Stack, "__gnat_alternate_stack");

   --  The alternate signal stack for stack overflows

   Alternate_Stack_Size : constant := 16 * 1024;

   --  This must be in keeping with init.c:__gnat_alternate_stack

   function Get_Stack_Base (thread : pthread_t) return Address;

   pragma Inline (Get_Stack_Base);

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

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

   -- Nonstandard Thread Initialization --

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

   procedure pthread_init;

   pragma Inline (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 Import (C, sigwait, "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");

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

   -- 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");

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

   -- POSIX.1c  Section 13 --

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

   type struct_sched_param is record

      sched_priority : int;  --  scheduling priority

   end record;

   pragma Convention (C, struct_sched_param);

   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_setschedpolicy

     (attr   : access pthread_attr_t;

      policy : int) return int;

   pragma Import

     (C, pthread_attr_setschedpolicy, "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, "pthread_attr_setdetachstate");

   function pthread_attr_setstacksize

     (attr      : access pthread_attr_t;

      stacksize : size_t) return int;

   pragma Import (C, pthread_attr_setstacksize, "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");

   function lwp_self return System.Address;

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

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

   -- POSIX.1c  Section 17 --

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

   function pthread_setspecific

     (key   : pthread_key_t;

      value : System.Address) return int;

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

   function pthread_getspecific (key : pthread_key_t) return System.Address;

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

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

   pragma Convention (C, destructor_pointer);

   function pthread_key_create

     (key        : access pthread_key_t;

      destructor : destructor_pointer) return int;

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

   CPU_SETSIZE : constant := 1_024;

   type bit_field is array (1 .. CPU_SETSIZE) of Boolean;

   for bit_field'Size use CPU_SETSIZE;

   pragma Pack (bit_field);

   pragma Convention (C, bit_field);

   type cpu_set_t is record

      bits : bit_field;

   end record;

   pragma Convention (C, cpu_set_t);

   function pthread_setaffinity_np

     (thread     : pthread_t;

      cpusetsize : size_t;

      cpuset     : access cpu_set_t) return int;

   pragma Import (C, pthread_setaffinity_np, "__gnat_pthread_setaffinity_np");

private

   type sigset_t is array (0 .. 127) of Interfaces.C.unsigned_char;

   pragma Convention (C, sigset_t);

   for sigset_t'Alignment use Interfaces.C.unsigned_long'Alignment;

   pragma Warnings (Off);

   for struct_sigaction use record

      sa_handler at Linux.sa_handler_pos range 0 .. Standard'Address_Size - 1;

      sa_mask    at Linux.sa_mask_pos    range 0 .. 1023;

      sa_flags   at Linux.sa_flags_pos   range 0 .. Standard'Address_Size - 1;

   end record;

   --  We intentionally leave sa_restorer unspecified and let the compiler

   --  append it after the last field, so disable corresponding warning.

   pragma Warnings (On);

   type pid_t is new int;

   type time_t is new long;

   type timespec is record

      tv_sec  : time_t;

      tv_nsec : long;

   end record;

   pragma Convention (C, timespec);

   type pthread_attr_t is record

      detachstate   : int;

      schedpolicy   : int;

      schedparam    : struct_sched_param;

      inheritsched  : int;

      scope         : int;

      guardsize     : size_t;

      stackaddr_set : int;

      stackaddr     : System.Address;

      stacksize     : size_t;

   end record;

   pragma Convention (C, pthread_attr_t);

   type pthread_condattr_t is record

      dummy : int;

   end record;

   pragma Convention (C, pthread_condattr_t);

   type pthread_mutexattr_t is record

      mutexkind : int;

   end record;

   pragma Convention (C, pthread_mutexattr_t);

   type pthread_mutex_t is new System.Linux.pthread_mutex_t;

   type pthread_cond_t is array (0 .. 47) of unsigned_char;

   pragma Convention (C, pthread_cond_t);

   type pthread_key_t is new unsigned;

end System.OS_Interface;