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------------------------------------------------------------------------------
--                                                                          --
--                GNU ADA 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) 1997-2011 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.      --
--                                                                          --
-- The GNARL files that were developed for RTEMS are maintained by  On-Line --
-- Applications Research Corporation (http://www.oarcorp.com)  in  coopera- --
-- tion with Ada Core Technologies Inc. and Florida State University.       --
--                                                                          --
------------------------------------------------------------------------------
 
--  This is the RTEMS version of this package.
--
--  RTEMS target names are of the form CPU-rtems.
--  This implementation is designed to work on ALL RTEMS targets.
--  The RTEMS implementation is primarily based upon the POSIX threads
--  API but there are also bindings to GNAT/RTEMS support routines
--  to insulate this code from C API specific details and, in some
--  cases, obtain target architecture and BSP specific information
--  that is unavailable at the time this package is built.
 
--  This package encapsulates all direct interfaces to OS services
--  that are needed by children of System.
 
--  PLEASE DO NOT add any with-clauses to this package
--  or remove the pragma Preelaborate.
--  It is designed to be a bottom-level (leaf) package.
 
with Interfaces.C;
package System.OS_Interface is
   pragma Preelaborate;
 
   --  This interface assumes that "unsigned" is a 32-bit entity.  This
   --  will correspond to RTEMS object ids.
 
   subtype rtems_id       is Interfaces.C.unsigned;
 
   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 := 116;
 
   -------------
   -- Signals --
   -------------
 
   Num_HW_Interrupts : constant := 256;
 
   Max_HW_Interrupt : constant := Num_HW_Interrupts - 1;
   type HW_Interrupt is new int range 0 .. Max_HW_Interrupt;
 
   Max_Interrupt : constant := Max_HW_Interrupt;
 
   type Signal is new int range 0 .. Max_Interrupt;
 
   SIGXCPU     : constant := 0; --  XCPU
   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
   SIGUSR1     : constant := 16; --  user defined signal 1
   SIGUSR2     : constant := 17; --  user defined signal 2
 
   SIGADAABORT : constant := SIGABRT;
 
   type Signal_Set is array (Natural range <>) of Signal;
 
   Unmasked    : constant Signal_Set := (SIGTRAP, SIGALRM, SIGEMT);
   Reserved    : constant Signal_Set := (1 .. 1 => SIGKILL);
 
   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_flags   : int;
      sa_mask    : sigset_t;
      sa_handler : System.Address;
   end record;
   pragma Convention (C, struct_sigaction);
   type struct_sigaction_ptr is access all struct_sigaction;
 
   SA_SIGINFO  : constant := 16#02#;
 
   SA_ONSTACK : constant := 16#00#;
   --  SA_ONSTACK is not defined on RTEMS, 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 := 1;
   SIG_UNBLOCK : constant := 2;
   SIG_SETMASK : constant := 3;
 
   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 (i.e SCHED_RR is supported)
 
   type timespec is private;
 
   type clockid_t is new int;
 
   CLOCK_REALTIME  : constant clockid_t;
   CLOCK_MONOTONIC : constant clockid_t;
 
   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);
 
   -------------------------
   -- Priority Scheduling --
   -------------------------
 
   SCHED_FIFO  : constant := 1;
   SCHED_RR    : constant := 2;
   SCHED_OTHER : constant := 0;
 
   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");
 
   ---------
   -- 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);
 
   type pthread_t           is private;
   subtype Thread_Id        is pthread_t;
 
   type pthread_mutex_t      is limited private;
   type pthread_rwlock_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_rwlockattr_t is limited private;
   type pthread_condattr_t   is limited private;
   type pthread_key_t        is private;
 
   No_Key : constant pthread_key_t;
 
   PTHREAD_CREATE_DETACHED : constant := 0;
 
   PTHREAD_SCOPE_PROCESS : constant := 0;
   PTHREAD_SCOPE_SYSTEM  : 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;
 
   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/RTEMS
   --  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.
 
   --  These two functions are only needed to share s-taprop.adb with
   --  FSU threads.
 
   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_ON  : constant := 0;
   PROT_OFF : constant := 0;
 
   function mprotect (addr : Address; len : size_t; prot : int) return int;
   pragma Import (C, mprotect);
 
   -----------------------------------------
   --  Nonstandard Thread Initialization  --
   -----------------------------------------
 
   procedure pthread_init;
   --  FSU_THREADS requires pthread_init, which is nonstandard
   --  and this should be invoked during the elaboration of s-taprop.adb
   --
   --  RTEMS does not require this so we provide an empty Ada body.
 
   -------------------------
   -- 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_rwlockattr_init
     (attr : access pthread_rwlockattr_t) return int;
   pragma Import (C, pthread_rwlockattr_init, "pthread_rwlockattr_init");
 
   function pthread_rwlockattr_destroy
     (attr : access pthread_rwlockattr_t) return int;
   pragma Import (C, pthread_rwlockattr_destroy, "pthread_rwlockattr_destroy");
 
   PTHREAD_RWLOCK_PREFER_READER_NP              : constant := 0;
   PTHREAD_RWLOCK_PREFER_WRITER_NP              : constant := 1;
   PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP : constant := 2;
 
   function pthread_rwlockattr_setkind_np
     (attr : access pthread_rwlockattr_t;
      pref : int) return int;
 
   function pthread_rwlock_init
     (mutex : access pthread_rwlock_t;
      attr  : access pthread_rwlockattr_t) return int;
   pragma Import (C, pthread_rwlock_init, "pthread_rwlock_init");
 
   function pthread_rwlock_destroy
     (mutex : access pthread_rwlock_t) return int;
   pragma Import (C, pthread_rwlock_destroy, "pthread_rwlock_destroy");
 
   function pthread_rwlock_rdlock (mutex : access pthread_rwlock_t) return int;
   pragma Import (C, pthread_rwlock_rdlock, "pthread_rwlock_rdlock");
 
   function pthread_rwlock_wrlock (mutex : access pthread_rwlock_t) return int;
   pragma Import (C, pthread_rwlock_wrlock, "pthread_rwlock_wrlock");
 
   function pthread_rwlock_unlock (mutex : access pthread_rwlock_t) return int;
   pragma Import (C, pthread_rwlock_unlock, "pthread_rwlock_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);
 
   function pthread_mutexattr_setprioceiling
     (attr     : access pthread_mutexattr_t;
      prioceiling : int) return int;
   pragma Import
     (C, pthread_mutexattr_setprioceiling,
      "pthread_mutexattr_setprioceiling");
 
   type struct_sched_param is record
      sched_priority      : int;
      ss_low_priority     : int;
      ss_replenish_period : timespec;
      ss_initial_budget   : timespec;
   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_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 pthread_attr_setschedparam
     (attr        : access pthread_attr_t;
      sched_param : int) return int;
   pragma Import (C, pthread_attr_setschedparam);
 
   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, "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 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");
 
   ------------------------------------------------------------
   --   Binary Semaphore Wrapper to Support Interrupt Tasks  --
   ------------------------------------------------------------
 
   type Binary_Semaphore_Id is new rtems_id;
 
   function Binary_Semaphore_Create return Binary_Semaphore_Id;
   pragma Import (
      C,
      Binary_Semaphore_Create,
      "__gnat_binary_semaphore_create");
 
   function Binary_Semaphore_Delete (ID : Binary_Semaphore_Id) return int;
   pragma Import (
      C,
      Binary_Semaphore_Delete,
      "__gnat_binary_semaphore_delete");
 
   function Binary_Semaphore_Obtain (ID : Binary_Semaphore_Id) return int;
   pragma Import (
      C,
      Binary_Semaphore_Obtain,
      "__gnat_binary_semaphore_obtain");
 
   function Binary_Semaphore_Release (ID : Binary_Semaphore_Id) return int;
   pragma Import (
      C,
      Binary_Semaphore_Release,
      "__gnat_binary_semaphore_release");
 
   function Binary_Semaphore_Flush (ID : Binary_Semaphore_Id) return int;
   pragma Import (
      C,
      Binary_Semaphore_Flush,
      "__gnat_binary_semaphore_flush");
 
   ------------------------------------------------------------
   -- Hardware Interrupt Wrappers to Support Interrupt Tasks --
   ------------------------------------------------------------
 
   type Interrupt_Handler is access procedure (parameter : System.Address);
   pragma Convention (C, Interrupt_Handler);
   type Interrupt_Vector is new System.Address;
 
   function Interrupt_Connect
     (vector    : Interrupt_Vector;
      handler   : Interrupt_Handler;
      parameter : System.Address := System.Null_Address) return int;
   pragma Import (C, Interrupt_Connect, "__gnat_interrupt_connect");
   --  Use this to set up an user handler. The routine installs a
   --  a user handler which is invoked after RTEMS has saved enough
   --  context for a high-level language routine to be safely invoked.
 
   function Interrupt_Vector_Get
     (Vector : Interrupt_Vector) return Interrupt_Handler;
   pragma Import (C, Interrupt_Vector_Get, "__gnat_interrupt_get");
   --  Use this to get the existing handler for later restoral.
 
   procedure Interrupt_Vector_Set
     (Vector  : Interrupt_Vector;
      Handler : Interrupt_Handler);
   pragma Import (C, Interrupt_Vector_Set, "__gnat_interrupt_set");
   --  Use this to restore a handler obtained using Interrupt_Vector_Get.
 
   function Interrupt_Number_To_Vector (intNum : int) return Interrupt_Vector;
   --  Convert a logical interrupt number to the hardware interrupt vector
   --  number used to connect the interrupt.
   pragma Import (
      C,
      Interrupt_Number_To_Vector,
      "__gnat_interrupt_number_to_vector"
   );
 
private
 
   type sigset_t is new int;
 
   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);
 
   CLOCK_REALTIME :  constant clockid_t := 1;
   CLOCK_MONOTONIC : constant clockid_t := 4;
 
   type pthread_attr_t is record
      is_initialized  : int;
      stackaddr       : System.Address;
      stacksize       : int;
      contentionscope : int;
      inheritsched    : int;
      schedpolicy     : int;
      schedparam      : struct_sched_param;
      cputime_clocked_allowed : int;
      detatchstate    : int;
   end record;
   pragma Convention (C, pthread_attr_t);
 
   type pthread_condattr_t is record
      flags           : int;
      process_shared  : int;
   end record;
   pragma Convention (C, pthread_condattr_t);
 
   type pthread_mutexattr_t is record
      is_initialized  : int;
      process_shared  : int;
      prio_ceiling    : int;
      protocol        : int;
      mutex_type      : int;
      recursive       : int;
   end record;
   pragma Convention (C, pthread_mutexattr_t);
 
   type pthread_rwlockattr_t is record
      is_initialized  : int;
      process_shared  : int;
   end record;
   pragma Convention (C, pthread_rwlockattr_t);
 
   type pthread_t is new rtems_id;
 
   type pthread_mutex_t is new rtems_id;
 
   type pthread_rwlock_t is new rtems_id;
 
   type pthread_cond_t is new rtems_id;
 
   type pthread_key_t is new rtems_id;
 
   No_Key : constant pthread_key_t := 0;
 
end System.OS_Interface;
 

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