gcc/ada/s-osinte-freebsd.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                  GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                --
   4 --                                                                          --
   5 --                   S Y S T E M . O S _ I N T E R F A C E                  --
   6 --                                                                          --
   7 --                                   S p e c                                --
   8 --                                                                          --
   9 --             Copyright (C) 1991-1994, Florida State University            --
  10 --          Copyright (C) 1995-2009, Free Software Foundation, Inc.         --
  11 --                                                                          --
  12 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  20 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  21 -- Boston, MA 02110-1301, USA.                                              --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNARL was developed by the GNARL team at Florida State University. It is --
  31 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  32 -- State University (http://www.gnat.com).                                  --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 --  This is the FreeBSD PTHREADS version of this package
  37
  38 --  This package encapsulates all direct interfaces to OS services
  39 --  that are needed by the tasking run-time (libgnarl).
  40
  41 --  PLEASE DO NOT add any with-clauses to this package or remove the pragma
  42 --  Preelaborate. This package is designed to be a bottom-level (leaf) package.
  43
  44 with Ada.Unchecked_Conversion;
  45
  46 with Interfaces.C;
  47
  48 package System.OS_Interface is
  49    pragma Preelaborate;
  50
  51    pragma Linker_Options ("-pthread");
  52
  53    subtype int            is Interfaces.C.int;
  54    subtype short          is Interfaces.C.short;
  55    subtype long           is Interfaces.C.long;
  56    subtype unsigned       is Interfaces.C.unsigned;
  57    subtype unsigned_short is Interfaces.C.unsigned_short;
  58    subtype unsigned_long  is Interfaces.C.unsigned_long;
  59    subtype unsigned_char  is Interfaces.C.unsigned_char;
  60    subtype plain_char     is Interfaces.C.plain_char;
  61    subtype size_t         is Interfaces.C.size_t;
  62
  63    -----------
  64    -- Errno --
  65    -----------
  66
  67    function Errno return int;
  68    pragma Inline (Errno);
  69
  70    EAGAIN    : constant := 35;
  71    EINTR     : constant := 4;
  72    EINVAL    : constant := 22;
  73    ENOMEM    : constant := 12;
  74    ETIMEDOUT : constant := 60;
  75
  76    -------------
  77    -- Signals --
  78    -------------
  79
  80    Max_Interrupt : constant := 31;
  81    type Signal is new int range 0 .. Max_Interrupt;
  82    for Signal'Size use int'Size;
  83
  84    SIGHUP     : constant := 1; --  hangup
  85    SIGINT     : constant := 2; --  interrupt (rubout)
  86    SIGQUIT    : constant := 3; --  quit (ASCD FS)
  87    SIGILL     : constant := 4; --  illegal instruction (not reset)
  88    SIGTRAP    : constant := 5; --  trace trap (not reset)
  89    SIGIOT     : constant := 6; --  IOT instruction
  90    SIGABRT    : constant := 6; --  used by abort, replace SIGIOT in the  future
  91    SIGEMT     : constant := 7; --  EMT instruction
  92    SIGFPE     : constant := 8; --  floating point exception
  93    SIGKILL    : constant := 9; --  kill (cannot be caught or ignored)
  94    SIGBUS     : constant := 10; --  bus error
  95    SIGSEGV    : constant := 11; --  segmentation violation
  96    SIGSYS     : constant := 12; --  bad argument to system call
  97    SIGPIPE    : constant := 13; --  write on a pipe with no one to read it
  98    SIGALRM    : constant := 14; --  alarm clock
  99    SIGTERM    : constant := 15; --  software termination signal from kill
 100    SIGURG     : constant := 16; --  urgent condition on IO channel
 101    SIGSTOP    : constant := 17; --  stop (cannot be caught or ignored)
 102    SIGTSTP    : constant := 18; --  user stop requested from tty
 103    SIGCONT    : constant := 19; --  stopped process has been continued
 104    SIGCLD     : constant := 20; --  alias for SIGCHLD
 105    SIGCHLD    : constant := 20; --  child status change
 106    SIGTTIN    : constant := 21; --  background tty read attempted
 107    SIGTTOU    : constant := 22; --  background tty write attempted
 108    SIGIO      : constant := 23; --  I/O possible (Solaris SIGPOLL alias)
 109    SIGXCPU    : constant := 24; --  CPU time limit exceeded
 110    SIGXFSZ    : constant := 25; --  filesize limit exceeded
 111    SIGVTALRM  : constant := 26; --  virtual timer expired
 112    SIGPROF    : constant := 27; --  profiling timer expired
 113    SIGWINCH   : constant := 28; --  window size change
 114    SIGINFO    : constant := 29; --  information request (NetBSD/FreeBSD)
 115    SIGUSR1    : constant := 30; --  user defined signal 1
 116    SIGUSR2    : constant := 31; --  user defined signal 2
 117
 118    SIGADAABORT : constant := SIGABRT;
 119    --  Change this if you want to use another signal for task abort.
 120    --  SIGTERM might be a good one.
 121
 122    type Signal_Set is array (Natural range <>) of Signal;
 123
 124    --  Interrupts that must be unmasked at all times.  FreeBSD
 125    --  pthreads will not allow an application to mask out any
 126    --  interrupt needed by the threads library.
 127    Unmasked : constant Signal_Set :=
 128      (SIGTRAP, SIGBUS, SIGTTIN, SIGTTOU, SIGTSTP);
 129
 130    --  FreeBSD will uses SIGPROF for timing.  Do not allow a
 131    --  handler to attach to this signal.
 132    Reserved : constant Signal_Set := (0 .. 0 => SIGPROF);
 133
 134    type sigset_t is private;
 135
 136    function sigaddset
 137      (set : access sigset_t;
 138       sig : Signal) return int;
 139    pragma Import (C, sigaddset, "sigaddset");
 140
 141    function sigdelset
 142      (set : access sigset_t;
 143       sig : Signal) return int;
 144    pragma Import (C, sigdelset, "sigdelset");
 145
 146    function sigfillset (set : access sigset_t) return int;
 147    pragma Import (C, sigfillset, "sigfillset");
 148
 149    function sigismember
 150      (set : access sigset_t;
 151       sig : Signal) return int;
 152    pragma Import (C, sigismember, "sigismember");
 153
 154    function sigemptyset (set : access sigset_t) return int;
 155    pragma Import (C, sigemptyset, "sigemptyset");
 156
 157    --  sigcontext is architecture dependent, so define it private
 158    type struct_sigcontext is private;
 159
 160    type old_struct_sigaction is record
 161       sa_handler : System.Address;
 162       sa_mask    : sigset_t;
 163       sa_flags   : int;
 164    end record;
 165    pragma Convention (C, old_struct_sigaction);
 166
 167    type new_struct_sigaction is record
 168       sa_handler : System.Address;
 169       sa_flags   : int;
 170       sa_mask    : sigset_t;
 171    end record;
 172    pragma Convention (C, new_struct_sigaction);
 173
 174    subtype struct_sigaction is new_struct_sigaction;
 175    type struct_sigaction_ptr is access all struct_sigaction;
 176
 177    SIG_BLOCK   : constant := 1;
 178    SIG_UNBLOCK : constant := 2;
 179    SIG_SETMASK : constant := 3;
 180
 181    SIG_DFL : constant := 0;
 182    SIG_IGN : constant := 1;
 183
 184    SA_SIGINFO : constant := 16#0040#;
 185    SA_ONSTACK : constant := 16#0001#;
 186
 187    function sigaction
 188      (sig  : Signal;
 189       act  : struct_sigaction_ptr;
 190       oact : struct_sigaction_ptr) return int;
 191    pragma Import (C, sigaction, "sigaction");
 192
 193    ----------
 194    -- Time --
 195    ----------
 196
 197    Time_Slice_Supported : constant Boolean := True;
 198    --  Indicates whether time slicing is supported (i.e SCHED_RR is supported)
 199
 200    type timespec is private;
 201
 202    function nanosleep (rqtp, rmtp : access timespec)  return int;
 203    pragma Import (C, nanosleep, "nanosleep");
 204
 205    type clockid_t is private;
 206
 207    CLOCK_REALTIME : constant clockid_t;
 208
 209    function clock_gettime
 210      (clock_id : clockid_t;
 211       tp       : access timespec)
 212       return int;
 213    pragma Import (C, clock_gettime, "clock_gettime");
 214
 215    function To_Duration (TS : timespec) return Duration;
 216    pragma Inline (To_Duration);
 217
 218    function To_Timespec (D : Duration) return timespec;
 219    pragma Inline (To_Timespec);
 220
 221    type struct_timezone is record
 222       tz_minuteswest : int;
 223       tz_dsttime     : int;
 224    end record;
 225    pragma Convention (C, struct_timezone);
 226
 227    procedure usleep (useconds : unsigned_long);
 228    pragma Import (C, usleep, "usleep");
 229
 230    -------------------------
 231    -- Priority Scheduling --
 232    -------------------------
 233
 234    SCHED_FIFO  : constant := 1;
 235    SCHED_OTHER : constant := 2;
 236    SCHED_RR    : constant := 3;
 237
 238    function To_Target_Priority
 239      (Prio : System.Any_Priority) return Interfaces.C.int;
 240    --  Maps System.Any_Priority to a POSIX priority
 241
 242    -------------
 243    -- Process --
 244    -------------
 245
 246    type pid_t is private;
 247
 248    Self_PID : constant pid_t;
 249
 250    function kill (pid : pid_t; sig : Signal) return int;
 251    pragma Import (C, kill, "kill");
 252
 253    function getpid return pid_t;
 254    pragma Import (C, getpid, "getpid");
 255
 256    ---------
 257    -- LWP --
 258    ---------
 259
 260    function lwp_self return System.Address;
 261    --  lwp_self does not exist on this thread library, revert to pthread_self
 262    --  which is the closest approximation (with getpid). This function is
 263    --  needed to share 7staprop.adb across POSIX-like targets.
 264    pragma Import (C, lwp_self, "pthread_self");
 265
 266    -------------
 267    -- Threads --
 268    -------------
 269
 270    type Thread_Body is access
 271      function (arg : System.Address) return System.Address;
 272    pragma Convention (C, Thread_Body);
 273
 274    function Thread_Body_Access is new
 275      Ada.Unchecked_Conversion (System.Address, Thread_Body);
 276
 277    type pthread_t           is private;
 278    subtype Thread_Id        is pthread_t;
 279
 280    type pthread_mutex_t     is limited private;
 281    type pthread_cond_t      is limited private;
 282    type pthread_attr_t      is limited private;
 283    type pthread_mutexattr_t is limited private;
 284    type pthread_condattr_t  is limited private;
 285    type pthread_key_t       is private;
 286
 287    PTHREAD_CREATE_DETACHED : constant := 1;
 288    PTHREAD_CREATE_JOINABLE : constant := 0;
 289
 290    PTHREAD_SCOPE_PROCESS : constant := 0;
 291    PTHREAD_SCOPE_SYSTEM  : constant := 2;
 292
 293    -----------
 294    -- Stack --
 295    -----------
 296
 297    type stack_t is record
 298       ss_sp    : System.Address;
 299       ss_size  : size_t;
 300       ss_flags : int;
 301    end record;
 302    pragma Convention (C, stack_t);
 303
 304    function sigaltstack
 305      (ss  : not null access stack_t;
 306       oss : access stack_t) return int;
 307    pragma Import (C, sigaltstack, "sigaltstack");
 308
 309    Alternate_Stack : aliased System.Address;
 310    --  This is a dummy definition, never used (Alternate_Stack_Size is null)
 311
 312    Alternate_Stack_Size : constant := 0;
 313    --  No alternate signal stack is used on this platform
 314
 315    Stack_Base_Available : constant Boolean := False;
 316    --  Indicates whether the stack base is available on this target. This
 317    --  allows us to share s-osinte.adb between all the FSU run time. Note that
 318    --  this value can only be true if pthread_t has a complete definition that
 319    --  corresponds exactly to the C header files.
 320
 321    function Get_Stack_Base (thread : pthread_t) return Address;
 322    pragma Inline (Get_Stack_Base);
 323    --  returns the stack base of the specified thread. Only call this function
 324    --  when Stack_Base_Available is True.
 325
 326    function Get_Page_Size return size_t;
 327    function Get_Page_Size return Address;
 328    pragma Import (C, Get_Page_Size, "getpagesize");
 329    --  Returns the size of a page
 330
 331    PROT_NONE  : constant := 0;
 332    PROT_READ  : constant := 1;
 333    PROT_WRITE : constant := 2;
 334    PROT_EXEC  : constant := 4;
 335    PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
 336    PROT_ON    : constant := PROT_NONE;
 337    PROT_OFF   : constant := PROT_ALL;
 338
 339    function mprotect (addr : Address; len : size_t; prot : int) return int;
 340    pragma Import (C, mprotect);
 341
 342    ---------------------------------------
 343    -- Nonstandard Thread Initialization --
 344    ---------------------------------------
 345
 346    --  FSU_THREADS requires pthread_init, which is nonstandard and this should
 347    --  be invoked during the elaboration of s-taprop.adb.
 348
 349    --  FreeBSD does not require this so we provide an empty Ada body
 350
 351    procedure pthread_init;
 352
 353    -------------------------
 354    -- POSIX.1c  Section 3 --
 355    -------------------------
 356
 357    function sigwait
 358      (set : access sigset_t;
 359       sig : access Signal) return int;
 360    pragma Import (C, sigwait, "sigwait");
 361
 362    function pthread_kill
 363      (thread : pthread_t;
 364       sig    : Signal) return int;
 365    pragma Import (C, pthread_kill, "pthread_kill");
 366
 367    function pthread_sigmask
 368      (how  : int;
 369       set  : access sigset_t;
 370       oset : access sigset_t) return int;
 371    pragma Import (C, pthread_sigmask, "pthread_sigmask");
 372
 373    --------------------------
 374    -- POSIX.1c  Section 11 --
 375    --------------------------
 376
 377    function pthread_mutexattr_init
 378      (attr : access pthread_mutexattr_t) return int;
 379    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 380
 381    function pthread_mutexattr_destroy
 382      (attr : access pthread_mutexattr_t) return int;
 383    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 384
 385    function pthread_mutex_init
 386      (mutex : access pthread_mutex_t;
 387       attr  : access pthread_mutexattr_t) return int;
 388    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 389
 390    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 391    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 392
 393    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 394    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 395
 396    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 397    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 398
 399    function pthread_condattr_init
 400      (attr : access pthread_condattr_t) return int;
 401    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 402
 403    function pthread_condattr_destroy
 404      (attr : access pthread_condattr_t) return int;
 405    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 406
 407    function pthread_cond_init
 408      (cond : access pthread_cond_t;
 409       attr : access pthread_condattr_t) return int;
 410    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 411
 412    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 413    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 414
 415    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 416    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 417
 418    function pthread_cond_wait
 419      (cond  : access pthread_cond_t;
 420       mutex : access pthread_mutex_t) return int;
 421    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 422
 423    function pthread_cond_timedwait
 424      (cond    : access pthread_cond_t;
 425       mutex   : access pthread_mutex_t;
 426       abstime : access timespec) return int;
 427    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 428
 429    Relative_Timed_Wait : constant Boolean := False;
 430    --  pthread_cond_timedwait requires an absolute delay time
 431
 432    --------------------------
 433    -- POSIX.1c  Section 13 --
 434    --------------------------
 435
 436    PTHREAD_PRIO_NONE    : constant := 0;
 437    PTHREAD_PRIO_PROTECT : constant := 2;
 438    PTHREAD_PRIO_INHERIT : constant := 1;
 439
 440    function pthread_mutexattr_setprotocol
 441      (attr     : access pthread_mutexattr_t;
 442       protocol : int) return int;
 443    pragma Import
 444       (C, pthread_mutexattr_setprotocol, "pthread_mutexattr_setprotocol");
 445
 446    function pthread_mutexattr_getprotocol
 447      (attr     : access pthread_mutexattr_t;
 448       protocol : access int) return int;
 449    pragma Import
 450      (C, pthread_mutexattr_getprotocol, "pthread_mutexattr_getprotocol");
 451
 452    function pthread_mutexattr_setprioceiling
 453      (attr     : access pthread_mutexattr_t;
 454       prioceiling : int) return int;
 455    pragma Import
 456      (C, pthread_mutexattr_setprioceiling,
 457       "pthread_mutexattr_setprioceiling");
 458
 459    function pthread_mutexattr_getprioceiling
 460      (attr     : access pthread_mutexattr_t;
 461       prioceiling : access int) return int;
 462    pragma Import
 463      (C, pthread_mutexattr_getprioceiling,
 464       "pthread_mutexattr_getprioceiling");
 465
 466    type struct_sched_param is record
 467       sched_priority : int;
 468    end record;
 469    pragma Convention (C, struct_sched_param);
 470
 471    function pthread_getschedparam
 472      (thread : pthread_t;
 473       policy : access int;
 474       param  : access struct_sched_param) return int;
 475    pragma Import (C, pthread_getschedparam, "pthread_getschedparam");
 476
 477    function pthread_setschedparam
 478      (thread : pthread_t;
 479       policy : int;
 480       param  : access struct_sched_param) return int;
 481    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 482
 483    function pthread_attr_setscope
 484      (attr            : access pthread_attr_t;
 485       contentionscope : int) return int;
 486    pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
 487
 488    function pthread_attr_getscope
 489      (attr            : access pthread_attr_t;
 490       contentionscope : access int) return int;
 491    pragma Import (C, pthread_attr_getscope, "pthread_attr_getscope");
 492
 493    function pthread_attr_setinheritsched
 494      (attr            : access pthread_attr_t;
 495       inheritsched : int) return int;
 496    pragma Import
 497      (C, pthread_attr_setinheritsched, "pthread_attr_setinheritsched");
 498
 499    function pthread_attr_getinheritsched
 500      (attr         : access pthread_attr_t;
 501       inheritsched : access int) return int;
 502    pragma Import
 503      (C, pthread_attr_getinheritsched, "pthread_attr_getinheritsched");
 504
 505    function pthread_attr_setschedpolicy
 506      (attr   : access pthread_attr_t;
 507       policy : int) return int;
 508    pragma Import (C, pthread_attr_setschedpolicy,
 509      "pthread_attr_setschedpolicy");
 510
 511    function pthread_attr_getschedpolicy
 512      (attr   : access pthread_attr_t;
 513       policy : access int) return int;
 514    pragma Import (C, pthread_attr_getschedpolicy,
 515      "pthread_attr_getschedpolicy");
 516
 517    function pthread_attr_setschedparam
 518      (attr        : access pthread_attr_t;
 519       sched_param : int) return int;
 520    pragma Import (C, pthread_attr_setschedparam, "pthread_attr_setschedparam");
 521
 522    function pthread_attr_getschedparam
 523      (attr        : access pthread_attr_t;
 524       sched_param : access int) return int;
 525    pragma Import (C, pthread_attr_getschedparam, "pthread_attr_getschedparam");
 526
 527    function sched_yield return int;
 528    pragma Import (C, sched_yield, "pthread_yield");
 529
 530    --------------------------
 531    -- P1003.1c  Section 16 --
 532    --------------------------
 533
 534    function pthread_attr_init (attributes : access pthread_attr_t) return int;
 535    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 536
 537    function pthread_attr_destroy
 538      (attributes : access pthread_attr_t) return int;
 539    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 540
 541    function pthread_attr_setdetachstate
 542      (attr        : access pthread_attr_t;
 543       detachstate : int) return int;
 544    pragma Import
 545      (C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
 546
 547    function pthread_attr_getdetachstate
 548      (attr        : access pthread_attr_t;
 549       detachstate : access int) return int;
 550    pragma Import
 551      (C, pthread_attr_getdetachstate, "pthread_attr_getdetachstate");
 552
 553    function pthread_attr_getstacksize
 554      (attr      : access pthread_attr_t;
 555       stacksize : access size_t) return int;
 556    pragma Import
 557      (C, pthread_attr_getstacksize, "pthread_attr_getstacksize");
 558
 559    function pthread_attr_setstacksize
 560      (attr      : access pthread_attr_t;
 561       stacksize : size_t) return int;
 562    pragma Import
 563      (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
 564
 565    function pthread_create
 566      (thread        : access pthread_t;
 567       attributes    : access pthread_attr_t;
 568       start_routine : Thread_Body;
 569       arg           : System.Address) return int;
 570    pragma Import (C, pthread_create, "pthread_create");
 571
 572    function pthread_detach (thread : pthread_t) return int;
 573    pragma Import (C, pthread_detach, "pthread_detach");
 574
 575    procedure pthread_exit (status : System.Address);
 576    pragma Import (C, pthread_exit, "pthread_exit");
 577
 578    function pthread_self return pthread_t;
 579    pragma Import (C, pthread_self, "pthread_self");
 580
 581    --------------------------
 582    -- POSIX.1c  Section 17 --
 583    --------------------------
 584
 585    function pthread_setspecific
 586      (key   : pthread_key_t;
 587       value : System.Address) return  int;
 588    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 589
 590    function pthread_getspecific (key : pthread_key_t) return System.Address;
 591    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 592
 593    type destructor_pointer is access procedure (arg : System.Address);
 594    pragma Convention (C, destructor_pointer);
 595
 596    function pthread_key_create
 597      (key        : access pthread_key_t;
 598       destructor : destructor_pointer) return int;
 599    pragma Import (C, pthread_key_create, "pthread_key_create");
 600
 601    ------------------------------------
 602    -- Non-portable Pthread Functions --
 603    ------------------------------------
 604
 605    function pthread_set_name_np
 606      (thread : pthread_t;
 607       name   : System.Address) return int;
 608    pragma Import (C, pthread_set_name_np, "pthread_set_name_np");
 609
 610 private
 611
 612    type sigset_t is array (1 .. 4) of unsigned;
 613
 614    --  In FreeBSD the component sa_handler turns out to
 615    --  be one a union type, and the selector is a macro:
 616    --  #define sa_handler __sigaction_u._handler
 617    --  #define sa_sigaction __sigaction_u._sigaction
 618
 619    --  Should we add a signal_context type here ???
 620    --  How could it be done independent of the CPU architecture ???
 621    --  sigcontext type is opaque, so it is architecturally neutral.
 622    --  It is always passed as an access type, so define it as an empty record
 623    --  since the contents are not used anywhere.
 624
 625    type struct_sigcontext is null record;
 626    pragma Convention (C, struct_sigcontext);
 627
 628    type pid_t is new int;
 629    Self_PID : constant pid_t := 0;
 630
 631    type time_t is new long;
 632
 633    type timespec is record
 634       ts_sec  : time_t;
 635       ts_nsec : long;
 636    end record;
 637    pragma Convention (C, timespec);
 638
 639    type clockid_t is new int;
 640    CLOCK_REALTIME : constant clockid_t := 0;
 641
 642    type pthread_t           is new System.Address;
 643    type pthread_attr_t      is new System.Address;
 644    type pthread_mutex_t     is new System.Address;
 645    type pthread_mutexattr_t is new System.Address;
 646    type pthread_cond_t      is new System.Address;
 647    type pthread_condattr_t  is new System.Address;
 648    type pthread_key_t       is new int;
 649
 650 end System.OS_Interface;