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) 1995-2020, Free Software Foundation, Inc.         --
11--                                                                          --
12-- GNAT 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 3,  or (at your option) any later ver- --
15-- sion.  GNAT 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.                                     --
18--                                                                          --
19-- As a special exception under Section 7 of GPL version 3, you are granted --
20-- additional permissions described in the GCC Runtime Library Exception,   --
21-- version 3.1, as published by the Free Software Foundation.               --
22--                                                                          --
23-- You should have received a copy of the GNU General Public License and    --
24-- a copy of the GCC Runtime Library Exception along with this program;     --
25-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
26-- <http://www.gnu.org/licenses/>.                                          --
27--                                                                          --
28-- GNARL was developed by the GNARL team at Florida State University. It is --
29-- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
30-- State University (http://www.gnat.com).                                  --
31--                                                                          --
32------------------------------------------------------------------------------
33
34--  This is the DragonFly BSD PTHREADS version of this package
35
36--  This package encapsulates all direct interfaces to OS services
37--  that are needed by the tasking run-time (libgnarl).
38
39--  PLEASE DO NOT add any with-clauses to this package or remove the pragma
40--  Preelaborate. This package is designed to be a bottom-level (leaf) package.
41
42with Ada.Unchecked_Conversion;
43
44with Interfaces.C;
45
46package System.OS_Interface is
47   pragma Preelaborate;
48
49   pragma Linker_Options ("-pthread");
50
51   subtype int            is Interfaces.C.int;
52   subtype short          is Interfaces.C.short;
53   subtype long           is Interfaces.C.long;
54   subtype unsigned       is Interfaces.C.unsigned;
55   subtype unsigned_short is Interfaces.C.unsigned_short;
56   subtype unsigned_long  is Interfaces.C.unsigned_long;
57   subtype unsigned_char  is Interfaces.C.unsigned_char;
58   subtype plain_char     is Interfaces.C.plain_char;
59   subtype size_t         is Interfaces.C.size_t;
60
61   -----------
62   -- Errno --
63   -----------
64
65   function Errno return int;
66   pragma Inline (Errno);
67
68   EAGAIN    : constant := 35;
69   EINTR     : constant := 4;
70   EINVAL    : constant := 22;
71   ENOMEM    : constant := 12;
72   ETIMEDOUT : constant := 60;
73
74   -------------
75   -- Signals --
76   -------------
77
78   Max_Interrupt : constant := 31;
79   type Signal is new int range 0 .. Max_Interrupt;
80   for Signal'Size use int'Size;
81
82   SIGHUP     : constant := 1; --  hangup
83   SIGINT     : constant := 2; --  interrupt (rubout)
84   SIGQUIT    : constant := 3; --  quit (ASCD FS)
85   SIGILL     : constant := 4; --  illegal instruction (not reset)
86   SIGTRAP    : constant := 5; --  trace trap (not reset)
87   SIGIOT     : constant := 6; --  IOT instruction
88   SIGABRT    : constant := 6; --  used by abort, replace SIGIOT in the  future
89   SIGEMT     : constant := 7; --  EMT instruction
90   SIGFPE     : constant := 8; --  floating point exception
91   SIGKILL    : constant := 9; --  kill (cannot be caught or ignored)
92   SIGBUS     : constant := 10; --  bus error
93   SIGSEGV    : constant := 11; --  segmentation violation
94   SIGSYS     : constant := 12; --  bad argument to system call
95   SIGPIPE    : constant := 13; --  write on a pipe with no one to read it
96   SIGALRM    : constant := 14; --  alarm clock
97   SIGTERM    : constant := 15; --  software termination signal from kill
98   SIGURG     : constant := 16; --  urgent condition on IO channel
99   SIGSTOP    : constant := 17; --  stop (cannot be caught or ignored)
100   SIGTSTP    : constant := 18; --  user stop requested from tty
101   SIGCONT    : constant := 19; --  stopped process has been continued
102   SIGCLD     : constant := 20; --  alias for SIGCHLD
103   SIGCHLD    : constant := 20; --  child status change
104   SIGTTIN    : constant := 21; --  background tty read attempted
105   SIGTTOU    : constant := 22; --  background tty write attempted
106   SIGIO      : constant := 23; --  I/O possible (Solaris SIGPOLL alias)
107   SIGXCPU    : constant := 24; --  CPU time limit exceeded
108   SIGXFSZ    : constant := 25; --  filesize limit exceeded
109   SIGVTALRM  : constant := 26; --  virtual timer expired
110   SIGPROF    : constant := 27; --  profiling timer expired
111   SIGWINCH   : constant := 28; --  window size change
112   SIGINFO    : constant := 29; --  information request (BSD)
113   SIGUSR1    : constant := 30; --  user defined signal 1
114   SIGUSR2    : constant := 31; --  user defined signal 2
115
116   SIGADAABORT : constant := SIGABRT;
117   --  Change this if you want to use another signal for task abort.
118   --  SIGTERM might be a good one.
119
120   type Signal_Set is array (Natural range <>) of Signal;
121
122   --  Interrupts that must be unmasked at all times.  DragonFlyBSD
123   --  pthreads will not allow an application to mask out any
124   --  interrupt needed by the threads library.
125   Unmasked : constant Signal_Set :=
126     (SIGTRAP, SIGBUS, SIGTTIN, SIGTTOU, SIGTSTP);
127
128   --  DragonFlyBSD will uses SIGPROF for timing.  Do not allow a
129   --  handler to attach to this signal.
130   Reserved : constant Signal_Set := (0 .. 0 => SIGPROF);
131
132   type sigset_t is private;
133
134   function sigaddset
135     (set : access sigset_t;
136      sig : Signal) return int;
137   pragma Import (C, sigaddset, "sigaddset");
138
139   function sigdelset
140     (set : access sigset_t;
141      sig : Signal) return int;
142   pragma Import (C, sigdelset, "sigdelset");
143
144   function sigfillset (set : access sigset_t) return int;
145   pragma Import (C, sigfillset, "sigfillset");
146
147   function sigismember
148     (set : access sigset_t;
149      sig : Signal) return int;
150   pragma Import (C, sigismember, "sigismember");
151
152   function sigemptyset (set : access sigset_t) return int;
153   pragma Import (C, sigemptyset, "sigemptyset");
154
155   --  sigcontext is architecture dependent, so define it private
156   type struct_sigcontext is private;
157
158   type old_struct_sigaction is record
159      sa_handler : System.Address;
160      sa_mask    : sigset_t;
161      sa_flags   : int;
162   end record;
163   pragma Convention (C, old_struct_sigaction);
164
165   type new_struct_sigaction is record
166      sa_handler : System.Address;
167      sa_flags   : int;
168      sa_mask    : sigset_t;
169   end record;
170   pragma Convention (C, new_struct_sigaction);
171
172   subtype struct_sigaction is new_struct_sigaction;
173   type struct_sigaction_ptr is access all struct_sigaction;
174
175   SIG_BLOCK   : constant := 1;
176   SIG_UNBLOCK : constant := 2;
177   SIG_SETMASK : constant := 3;
178
179   SIG_DFL : constant := 0;
180   SIG_IGN : constant := 1;
181
182   SA_SIGINFO : constant := 16#0040#;
183   SA_ONSTACK : constant := 16#0001#;
184
185   function sigaction
186     (sig  : Signal;
187      act  : struct_sigaction_ptr;
188      oact : struct_sigaction_ptr) return int;
189   pragma Import (C, sigaction, "sigaction");
190
191   ----------
192   -- Time --
193   ----------
194
195   Time_Slice_Supported : constant Boolean := True;
196   --  Indicates whether time slicing is supported (i.e SCHED_RR is supported)
197
198   type timespec is private;
199
200   function nanosleep (rqtp, rmtp : access timespec)  return int;
201   pragma Import (C, nanosleep, "nanosleep");
202
203   type clockid_t is new unsigned_long;
204
205   function clock_getres
206     (clock_id : clockid_t;
207      res      : access timespec) return int;
208   pragma Import (C, clock_getres, "clock_getres");
209
210   function clock_gettime
211     (clock_id : clockid_t;
212      tp       : access timespec)
213      return int;
214   pragma Import (C, clock_gettime, "clock_gettime");
215
216   function To_Duration (TS : timespec) return Duration;
217   pragma Inline (To_Duration);
218
219   function To_Timespec (D : Duration) return timespec;
220   pragma Inline (To_Timespec);
221
222   type struct_timezone is record
223      tz_minuteswest : int;
224      tz_dsttime     : int;
225   end record;
226   pragma Convention (C, struct_timezone);
227
228   procedure usleep (useconds : unsigned_long);
229   pragma Import (C, usleep, "usleep");
230
231   -------------------------
232   -- Priority Scheduling --
233   -------------------------
234
235   SCHED_FIFO  : constant := 1;
236   SCHED_OTHER : constant := 2;
237   SCHED_RR    : constant := 3;
238
239   function To_Target_Priority
240     (Prio : System.Any_Priority) return Interfaces.C.int;
241   --  Maps System.Any_Priority to a POSIX priority
242
243   -------------
244   -- Process --
245   -------------
246
247   type pid_t is private;
248
249   function kill (pid : pid_t; sig : Signal) return int;
250   pragma Import (C, kill, "kill");
251
252   function getpid return pid_t;
253   pragma Import (C, getpid, "getpid");
254
255   ---------
256   -- LWP --
257   ---------
258
259   function lwp_self return System.Address;
260   --  lwp_self does not exist on this thread library, revert to pthread_self
261   --  which is the closest approximation (with getpid). This function is
262   --  needed to share 7staprop.adb across POSIX-like targets.
263   pragma Import (C, lwp_self, "pthread_self");
264
265   -------------
266   -- Threads --
267   -------------
268
269   type Thread_Body is access
270     function (arg : System.Address) return System.Address;
271   pragma Convention (C, Thread_Body);
272
273   function Thread_Body_Access is new
274     Ada.Unchecked_Conversion (System.Address, Thread_Body);
275
276   type pthread_t           is private;
277   subtype Thread_Id        is pthread_t;
278
279   type pthread_mutex_t     is limited private;
280   type pthread_cond_t      is limited private;
281   type pthread_attr_t      is limited private;
282   type pthread_mutexattr_t is limited private;
283   type pthread_condattr_t  is limited private;
284   type pthread_key_t       is private;
285
286   PTHREAD_CREATE_DETACHED : constant := 1;
287   PTHREAD_CREATE_JOINABLE : constant := 0;
288
289   PTHREAD_SCOPE_PROCESS : constant := 0;
290   PTHREAD_SCOPE_SYSTEM  : constant := 2;
291
292   --  Read/Write lock not supported on DragonFly. To add support both types
293   --  pthread_rwlock_t and pthread_rwlockattr_t must properly be defined
294   --  with the associated routines pthread_rwlock_[init/destroy] and
295   --  pthread_rwlock_[rdlock/wrlock/unlock].
296
297   subtype pthread_rwlock_t     is pthread_mutex_t;
298   subtype pthread_rwlockattr_t is pthread_mutexattr_t;
299
300   -----------
301   -- Stack --
302   -----------
303
304   type stack_t is record
305      ss_sp    : System.Address;
306      ss_size  : size_t;
307      ss_flags : int;
308   end record;
309   pragma Convention (C, stack_t);
310
311   function sigaltstack
312     (ss  : not null access stack_t;
313      oss : access stack_t) return int;
314   pragma Import (C, sigaltstack, "sigaltstack");
315
316   Alternate_Stack : aliased System.Address;
317   --  This is a dummy definition, never used (Alternate_Stack_Size is null)
318
319   Alternate_Stack_Size : constant := 0;
320   --  No alternate signal stack is used on this platform
321
322   Stack_Base_Available : constant Boolean := False;
323   --  Indicates whether the stack base is available on this target. This
324   --  allows us to share s-osinte.adb between all the FSU run time. Note that
325   --  this value can only be true if pthread_t has a complete definition that
326   --  corresponds exactly to the C header files.
327
328   function Get_Stack_Base (thread : pthread_t) return Address;
329   pragma Inline (Get_Stack_Base);
330   --  returns the stack base of the specified thread. Only call this function
331   --  when Stack_Base_Available is True.
332
333   function Get_Page_Size return int;
334   pragma Import (C, Get_Page_Size, "getpagesize");
335   --  Returns the size of a page
336
337   PROT_NONE  : constant := 0;
338   PROT_READ  : constant := 1;
339   PROT_WRITE : constant := 2;
340   PROT_EXEC  : constant := 4;
341   PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
342   PROT_ON    : constant := PROT_NONE;
343   PROT_OFF   : constant := PROT_ALL;
344
345   function mprotect (addr : Address; len : size_t; prot : int) return int;
346   pragma Import (C, mprotect);
347
348   ---------------------------------------
349   -- Nonstandard Thread Initialization --
350   ---------------------------------------
351
352   --  FSU_THREADS requires pthread_init, which is nonstandard and this should
353   --  be invoked during the elaboration of s-taprop.adb.
354
355   --  DragonFlyBSD does not require this so we provide an empty Ada body
356
357   procedure pthread_init;
358
359   -------------------------
360   -- POSIX.1c  Section 3 --
361   -------------------------
362
363   function sigwait
364     (set : access sigset_t;
365      sig : access Signal) return int;
366   pragma Import (C, sigwait, "sigwait");
367
368   function pthread_kill
369     (thread : pthread_t;
370      sig    : Signal) return int;
371   pragma Import (C, pthread_kill, "pthread_kill");
372
373   function pthread_sigmask
374     (how  : int;
375      set  : access sigset_t;
376      oset : access sigset_t) return int;
377   pragma Import (C, pthread_sigmask, "pthread_sigmask");
378
379   --------------------------
380   -- POSIX.1c  Section 11 --
381   --------------------------
382
383   function pthread_mutexattr_init
384     (attr : access pthread_mutexattr_t) return int;
385   pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
386
387   function pthread_mutexattr_destroy
388     (attr : access pthread_mutexattr_t) return int;
389   pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
390
391   function pthread_mutex_init
392     (mutex : access pthread_mutex_t;
393      attr  : access pthread_mutexattr_t) return int;
394   pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
395
396   function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
397   pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
398
399   function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
400   pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
401
402   function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
403   pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
404
405   function pthread_condattr_init
406     (attr : access pthread_condattr_t) return int;
407   pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
408
409   function pthread_condattr_destroy
410     (attr : access pthread_condattr_t) return int;
411   pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
412
413   function pthread_cond_init
414     (cond : access pthread_cond_t;
415      attr : access pthread_condattr_t) return int;
416   pragma Import (C, pthread_cond_init, "pthread_cond_init");
417
418   function pthread_cond_destroy (cond : access pthread_cond_t) return int;
419   pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
420
421   function pthread_cond_signal (cond : access pthread_cond_t) return int;
422   pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
423
424   function pthread_cond_wait
425     (cond  : access pthread_cond_t;
426      mutex : access pthread_mutex_t) return int;
427   pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
428
429   function pthread_cond_timedwait
430     (cond    : access pthread_cond_t;
431      mutex   : access pthread_mutex_t;
432      abstime : access timespec) return int;
433   pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
434
435   Relative_Timed_Wait : constant Boolean := False;
436   --  pthread_cond_timedwait requires an absolute delay time
437
438   --------------------------
439   -- POSIX.1c  Section 13 --
440   --------------------------
441
442   PTHREAD_PRIO_NONE    : constant := 0;
443   PTHREAD_PRIO_PROTECT : constant := 2;
444   PTHREAD_PRIO_INHERIT : constant := 1;
445
446   function pthread_mutexattr_setprotocol
447     (attr     : access pthread_mutexattr_t;
448      protocol : int) return int;
449   pragma Import
450      (C, pthread_mutexattr_setprotocol, "pthread_mutexattr_setprotocol");
451
452   function pthread_mutexattr_getprotocol
453     (attr     : access pthread_mutexattr_t;
454      protocol : access int) return int;
455   pragma Import
456     (C, pthread_mutexattr_getprotocol, "pthread_mutexattr_getprotocol");
457
458   function pthread_mutexattr_setprioceiling
459     (attr     : access pthread_mutexattr_t;
460      prioceiling : int) return int;
461   pragma Import
462     (C, pthread_mutexattr_setprioceiling,
463      "pthread_mutexattr_setprioceiling");
464
465   function pthread_mutexattr_getprioceiling
466     (attr     : access pthread_mutexattr_t;
467      prioceiling : access int) return int;
468   pragma Import
469     (C, pthread_mutexattr_getprioceiling,
470      "pthread_mutexattr_getprioceiling");
471
472   type struct_sched_param is record
473      sched_priority : int;
474   end record;
475   pragma Convention (C, struct_sched_param);
476
477   function pthread_getschedparam
478     (thread : pthread_t;
479      policy : access int;
480      param  : access struct_sched_param) return int;
481   pragma Import (C, pthread_getschedparam, "pthread_getschedparam");
482
483   function pthread_setschedparam
484     (thread : pthread_t;
485      policy : int;
486      param  : access struct_sched_param) return int;
487   pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
488
489   function pthread_attr_setscope
490     (attr            : access pthread_attr_t;
491      contentionscope : int) return int;
492   pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
493
494   function pthread_attr_getscope
495     (attr            : access pthread_attr_t;
496      contentionscope : access int) return int;
497   pragma Import (C, pthread_attr_getscope, "pthread_attr_getscope");
498
499   function pthread_attr_setinheritsched
500     (attr            : access pthread_attr_t;
501      inheritsched : int) return int;
502   pragma Import
503     (C, pthread_attr_setinheritsched, "pthread_attr_setinheritsched");
504
505   function pthread_attr_getinheritsched
506     (attr         : access pthread_attr_t;
507      inheritsched : access int) return int;
508   pragma Import
509     (C, pthread_attr_getinheritsched, "pthread_attr_getinheritsched");
510
511   function pthread_attr_setschedpolicy
512     (attr   : access pthread_attr_t;
513      policy : int) return int;
514   pragma Import (C, pthread_attr_setschedpolicy,
515     "pthread_attr_setschedpolicy");
516
517   function pthread_attr_getschedpolicy
518     (attr   : access pthread_attr_t;
519      policy : access int) return int;
520   pragma Import (C, pthread_attr_getschedpolicy,
521     "pthread_attr_getschedpolicy");
522
523   function pthread_attr_setschedparam
524     (attr        : access pthread_attr_t;
525      sched_param : int) return int;
526   pragma Import (C, pthread_attr_setschedparam, "pthread_attr_setschedparam");
527
528   function pthread_attr_getschedparam
529     (attr        : access pthread_attr_t;
530      sched_param : access int) return int;
531   pragma Import (C, pthread_attr_getschedparam, "pthread_attr_getschedparam");
532
533   function sched_yield return int;
534   pragma Import (C, sched_yield, "pthread_yield");
535
536   --------------------------
537   -- P1003.1c  Section 16 --
538   --------------------------
539
540   function pthread_attr_init (attributes : access pthread_attr_t) return int;
541   pragma Import (C, pthread_attr_init, "pthread_attr_init");
542
543   function pthread_attr_destroy
544     (attributes : access pthread_attr_t) return int;
545   pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
546
547   function pthread_attr_setdetachstate
548     (attr        : access pthread_attr_t;
549      detachstate : int) return int;
550   pragma Import
551     (C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
552
553   function pthread_attr_getdetachstate
554     (attr        : access pthread_attr_t;
555      detachstate : access int) return int;
556   pragma Import
557     (C, pthread_attr_getdetachstate, "pthread_attr_getdetachstate");
558
559   function pthread_attr_getstacksize
560     (attr      : access pthread_attr_t;
561      stacksize : access size_t) return int;
562   pragma Import
563     (C, pthread_attr_getstacksize, "pthread_attr_getstacksize");
564
565   function pthread_attr_setstacksize
566     (attr      : access pthread_attr_t;
567      stacksize : size_t) return int;
568   pragma Import
569     (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
570
571   function pthread_create
572     (thread        : access pthread_t;
573      attributes    : access pthread_attr_t;
574      start_routine : Thread_Body;
575      arg           : System.Address) return int;
576   pragma Import (C, pthread_create, "pthread_create");
577
578   function pthread_detach (thread : pthread_t) return int;
579   pragma Import (C, pthread_detach, "pthread_detach");
580
581   procedure pthread_exit (status : System.Address);
582   pragma Import (C, pthread_exit, "pthread_exit");
583
584   function pthread_self return pthread_t;
585   pragma Import (C, pthread_self, "pthread_self");
586
587   --------------------------
588   -- POSIX.1c  Section 17 --
589   --------------------------
590
591   function pthread_setspecific
592     (key   : pthread_key_t;
593      value : System.Address) return  int;
594   pragma Import (C, pthread_setspecific, "pthread_setspecific");
595
596   function pthread_getspecific (key : pthread_key_t) return System.Address;
597   pragma Import (C, pthread_getspecific, "pthread_getspecific");
598
599   type destructor_pointer is access procedure (arg : System.Address);
600   pragma Convention (C, destructor_pointer);
601
602   function pthread_key_create
603     (key        : access pthread_key_t;
604      destructor : destructor_pointer) return int;
605   pragma Import (C, pthread_key_create, "pthread_key_create");
606
607   ------------------------------------
608   -- Non-portable Pthread Functions --
609   ------------------------------------
610
611   function pthread_set_name_np
612     (thread : pthread_t;
613      name   : System.Address) return int;
614   pragma Import (C, pthread_set_name_np, "pthread_set_name_np");
615
616private
617
618   type sigset_t is array (1 .. 4) of unsigned;
619
620   --  In DragonFlyBSD the component sa_handler turns out to
621   --  be one a union type, and the selector is a macro:
622   --  #define sa_handler __sigaction_u._handler
623   --  #define sa_sigaction __sigaction_u._sigaction
624
625   --  Should we add a signal_context type here ???
626   --  How could it be done independent of the CPU architecture ???
627   --  sigcontext type is opaque, so it is architecturally neutral.
628   --  It is always passed as an access type, so define it as an empty record
629   --  since the contents are not used anywhere.
630
631   type struct_sigcontext is null record;
632   pragma Convention (C, struct_sigcontext);
633
634   type pid_t is new int;
635
636   type time_t is new long;
637
638   type timespec is record
639      ts_sec  : time_t;
640      ts_nsec : long;
641   end record;
642   pragma Convention (C, timespec);
643
644   type pthread_t           is new System.Address;
645   type pthread_attr_t      is new System.Address;
646   type pthread_mutex_t     is new System.Address;
647   type pthread_mutexattr_t is new System.Address;
648   type pthread_cond_t      is new System.Address;
649   type pthread_condattr_t  is new System.Address;
650   type pthread_key_t       is new int;
651
652end System.OS_Interface;
653