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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. It is --

-- now maintained by Ada Core Technologies Inc. in cooperation with Florida --

-- State University (http://www.gnat.com).                                  --

--                                                                          --

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

--  This is the FreeBSD PTHREADS 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 ("-pthread");

   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 Inline (Errno);

   EAGAIN    : constant := 35;

   EINTR     : constant := 4;

   EINVAL    : constant := 22;

   ENOMEM    : constant := 12;

   ETIMEDOUT : constant := 60;

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

   -- Signals --

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

   Max_Interrupt : constant := 31;

   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)

   SIGIOT     : constant := 6; --  IOT instruction

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

   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)

   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

   SIGINFO    : constant := 29; --  information request (NetBSD/FreeBSD)

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

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

   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;

   --  Interrupts that must be unmasked at all times.  FreeBSD

   --  pthreads will not allow an application to mask out any

   --  interrupt needed by the threads library.

   Unmasked : constant Signal_Set :=

     (SIGTRAP, SIGBUS, SIGTTIN, SIGTTOU, SIGTSTP);

   --  FreeBSD will uses SIGPROF for timing.  Do not allow a

   --  handler to attach to this signal.

   Reserved : constant Signal_Set := (0 .. 0 => SIGPROF);

   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");

   --  sigcontext is architecture dependent, so define it private

   type struct_sigcontext is private;

   type old_struct_sigaction is record

      sa_handler : System.Address;

      sa_mask    : sigset_t;

      sa_flags   : int;

   end record;

   pragma Convention (C, old_struct_sigaction);

   type new_struct_sigaction is record

      sa_handler : System.Address;

      sa_flags   : int;

      sa_mask    : sigset_t;

   end record;

   pragma Convention (C, new_struct_sigaction);

   subtype struct_sigaction is new_struct_sigaction;

   type struct_sigaction_ptr is access all struct_sigaction;

   SIG_BLOCK   : constant := 1;

   SIG_UNBLOCK : constant := 2;

   SIG_SETMASK : constant := 3;

   SIG_DFL : constant := 0;

   SIG_IGN : constant := 1;

   SA_SIGINFO : constant := 16#0040#;

   SA_ONSTACK : constant := 16#0001#;

   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 (i.e SCHED_RR is supported)

   type timespec is private;

   function nanosleep (rqtp, rmtp : access timespec)  return int;

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

   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 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);

   procedure usleep (useconds : unsigned_long);

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

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

   -- Priority Scheduling --

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

   SCHED_FIFO  : constant := 1;

   SCHED_OTHER : constant := 2;

   SCHED_RR    : constant := 3;

   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;

   Self_PID : constant pid_t;

   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;

   --  lwp_self does not exist on this thread library, revert to pthread_self

   --  which is the closest approximation (with getpid). This function is

   --  needed to share 7staprop.adb across POSIX-like targets.

   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;

   PTHREAD_SCOPE_PROCESS : constant := 0;

   PTHREAD_SCOPE_SYSTEM  : constant := 2;

   --  Read/Write lock not supported on freebsd. To add support both types

   --  pthread_rwlock_t and pthread_rwlockattr_t must properly be defined

   --  with the associated routines pthread_rwlock_[init/destroy] and

   --  pthread_rwlock_[rdlock/wrlock/unlock].

   subtype pthread_rwlock_t     is pthread_mutex_t;

   subtype pthread_rwlockattr_t is pthread_mutexattr_t;

   -----------

   -- Stack --

   -----------

   type stack_t is record

      ss_sp    : System.Address;

      ss_size  : size_t;

      ss_flags : int;

   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;

   --  This is a dummy definition, never used (Alternate_Stack_Size is null)

   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. This

   --  allows us to share s-osinte.adb between all the FSU run time. Note that

   --  this value can only be true if pthread_t has a complete definition that

   --  corresponds exactly to the C header files.

   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

   PROT_NONE  : constant := 0;

   PROT_READ  : constant := 1;

   PROT_WRITE : constant := 2;

   PROT_EXEC  : constant := 4;

   PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;

   PROT_ON    : constant := PROT_NONE;

   PROT_OFF   : constant := PROT_ALL;

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

   pragma Import (C, mprotect);

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

   -- Nonstandard Thread Initialization --

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

   --  FSU_THREADS requires pthread_init, which is nonstandard and this should

   --  be invoked during the elaboration of s-taprop.adb.

   --  FreeBSD does not require this so we provide an empty Ada body

   procedure pthread_init;

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

   -- 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");

   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_PROTECT : constant := 2;

   PTHREAD_PRIO_INHERIT : constant := 1;

   function pthread_mutexattr_setprotocol

     (attr     : access pthread_mutexattr_t;

      protocol : int) return int;

   pragma Import

      (C, pthread_mutexattr_setprotocol, "pthread_mutexattr_setprotocol");

   function pthread_mutexattr_getprotocol

     (attr     : access pthread_mutexattr_t;

      protocol : access int) return int;

   pragma Import

     (C, pthread_mutexattr_getprotocol, "pthread_mutexattr_getprotocol");

   function pthread_mutexattr_setprioceiling

     (attr     : access pthread_mutexattr_t;

      prioceiling : int) return int;

   pragma Import

     (C, pthread_mutexattr_setprioceiling,

      "pthread_mutexattr_setprioceiling");

   function pthread_mutexattr_getprioceiling

     (attr     : access pthread_mutexattr_t;

      prioceiling : access int) return int;

   pragma Import

     (C, pthread_mutexattr_getprioceiling,

      "pthread_mutexattr_getprioceiling");

   type struct_sched_param is record

      sched_priority : int;

   end record;

   pragma Convention (C, struct_sched_param);

   function pthread_getschedparam

     (thread : pthread_t;

      policy : access int;

      param  : access struct_sched_param) return int;

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

   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_getscope

     (attr            : access pthread_attr_t;

      contentionscope : access int) return int;

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

   function pthread_attr_setinheritsched

     (attr            : access pthread_attr_t;

      inheritsched : int) return int;

   pragma Import

     (C, pthread_attr_setinheritsched, "pthread_attr_setinheritsched");

   function pthread_attr_getinheritsched

     (attr         : access pthread_attr_t;

      inheritsched : access int) return int;

   pragma Import

     (C, pthread_attr_getinheritsched, "pthread_attr_getinheritsched");

   function pthread_attr_setschedpolicy

     (attr   : access pthread_attr_t;

      policy : int) return int;

   pragma Import (C, pthread_attr_setschedpolicy,

     "pthread_attr_setschedpolicy");

   function pthread_attr_getschedpolicy

     (attr   : access pthread_attr_t;

      policy : access int) return int;

   pragma Import (C, pthread_attr_getschedpolicy,

     "pthread_attr_getschedpolicy");

   function pthread_attr_setschedparam

     (attr        : access pthread_attr_t;

      sched_param : int) return int;

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

   function pthread_attr_getschedparam

     (attr        : access pthread_attr_t;

      sched_param : access int) return int;

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

   function sched_yield return int;

   pragma Import (C, sched_yield, "pthread_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_getdetachstate

     (attr        : access pthread_attr_t;

      detachstate : access int) return int;

   pragma Import

     (C, pthread_attr_getdetachstate, "pthread_attr_getdetachstate");

   function pthread_attr_getstacksize

     (attr      : access pthread_attr_t;

      stacksize : access size_t) return int;

   pragma Import

     (C, pthread_attr_getstacksize, "pthread_attr_getstacksize");

   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");

   function pthread_detach (thread : pthread_t) return int;

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

   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 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");

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

   -- Non-portable Pthread Functions --

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

   function pthread_set_name_np

     (thread : pthread_t;

      name   : System.Address) return int;

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

private

   type sigset_t is array (1 .. 4) of unsigned;

   --  In FreeBSD the component sa_handler turns out to

   --  be one a union type, and the selector is a macro:

   --  #define sa_handler __sigaction_u._handler

   --  #define sa_sigaction __sigaction_u._sigaction

   --  Should we add a signal_context type here ???

   --  How could it be done independent of the CPU architecture ???

   --  sigcontext type is opaque, so it is architecturally neutral.

   --  It is always passed as an access type, so define it as an empty record

   --  since the contents are not used anywhere.

   type struct_sigcontext is null record;

   pragma Convention (C, struct_sigcontext);

   type pid_t is new int;

   Self_PID : constant pid_t := 0;

   type time_t is new long;

   type timespec is record

      ts_sec  : time_t;

      ts_nsec : long;

   end record;

   pragma Convention (C, timespec);

   type pthread_t           is new System.Address;

   type pthread_attr_t      is new System.Address;

   type pthread_mutex_t     is new System.Address;

   type pthread_mutexattr_t is new System.Address;

   type pthread_cond_t      is new System.Address;

   type pthread_condattr_t  is new System.Address;

   type pthread_key_t       is new int;

end System.OS_Interface;